KR20140131250A - Power supply and dc-dc converter therein - Google Patents

Abstract

A power supply device in accordance with the present invention comprises: a rectifying circuit part for rectifying power from a power source; a smoothing circuit part for smoothing the voltage of the rectified power; and a down-converting circuit part for down-converting the smoothed voltage. The down-converting circuit part comprises: a charge-storing circuit for outputting the down-converted voltage; a resonant circuit for receiving a first current from the smoothing circuit part, and supplying a second current to the charge-storing circuit; and a current-interrupting circuit for controlling the first and second currents. The power supply device can utilize zero-current switching, which is performed when there is no current flow, by using the resonant circuit.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a power supply device,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power supply device for reducing switching loss and a voltage drop circuit included therein, and more particularly to a power supply device for switching a zero current using a resonance circuit and a voltage drop circuit included therein.

Generally, a voltage drop circuit means a circuit that drops a voltage of an input DC voltage and outputs a voltage lower than an input voltage.

Such a voltage drop circuit is typically a buck converter including a switching element, an inductor, and a diode. The buck converter connects the switching element and the inductor in series between the input and the output, and connects the diode in parallel to the input and output. The buck converter outputs a voltage lower than the input voltage by repeatedly turning on and off the switching element.

Conventional buck converters generate a large switching loss due to repeated turn-on and turn-off of the switching element while current is being supplied from the input to the output side. Since current flows continuously in one direction to the inductor, large heat is generated in the inductor A separate heat dissipating device is required.

In order to solve the above problems, one aspect of the disclosed invention is to provide an improved voltage drop circuit using zero current switching that performs switching at a time when no current flows by using a resonant circuit.

According to an aspect of the present invention, there is provided a power supply apparatus including a rectifying circuit section for rectifying a power supply, a smoothing circuit section for smoothing a voltage of the rectified power supply, and a voltage drop circuit section for dropping the smoothed voltage, A charge storage circuit for outputting a voltage dropped voltage; a resonance circuit for receiving a first current from the smoothing circuit and supplying a second current to the charge storage circuit; and a current circuit for controlling the first current and the second current Circuit.

According to an embodiment, the current interrupt circuit may include a switching circuit for interrupting the first current and the second current, and a rectifying circuit for rectifying the first current and the second current.

According to an embodiment, the switching circuit may include a first switch for interrupting the first current, and a second switch for interrupting the second current.

The power supply device may further include a voltage drop control unit for controlling the first switch and the second switch according to the embodiment.

According to an embodiment, the voltage drop control unit may alternately open and close the first switch and the second switch.

According to an embodiment, the voltage drop control unit may open and close the first switch and the second switch at the same period as the resonance period of the resonance circuit.

According to an embodiment, the rectifying circuit may include a first diode that passes the first current and blocks the second current, and a second diode that cuts off the first current and passes the second current.

According to an embodiment, the current interrupt circuit may include a switching circuit connected in series with the charge storage circuit, and a rectifier circuit connected in parallel with the charge storage circuit.

According to an embodiment, the switching circuit may include a first switch and a second switch connected in series with each other.

According to an embodiment, the rectifier circuit may include a first diode and a second diode connected in series with each other.

According to an embodiment, the resonance circuit may be provided between a node where the first switch and the second switch are connected to each other and a node where the first diode and the second diode are connected to each other.

According to an embodiment, the resonant circuit may include at least one capacitor and at least one inductor.

According to an embodiment, the power supply may further comprise an initial charging circuit for initially charging the charge storage circuit.

According to an embodiment, the initial charging circuit may be provided in series between one end of the charge storage circuit and one end of the switching circuit.

According to an embodiment, the initial charging circuit includes a charge current limiting circuit for limiting the magnitude of an initial charge current for charging the charge storage circuit, and a first initial charge switch for interrupting an initial charge current supplied to the charge storage circuit .

According to an embodiment, the initial charging circuit may further include a second initial charge switch for interrupting an initial charge current supplied to the resonant capacitor included in the resonant circuit.

According to another aspect of the present invention, there is provided a voltage drop circuit for dropping a voltage of a power supply, the voltage drop circuit comprising: a charge storage circuit for outputting the voltage dropped voltage; A switching circuit portion for interrupting the first current and the second current; and the current interrupting circuit may include a rectifying circuit portion for rectifying the first current and the second current.

According to an embodiment, the switching circuit may include a first switch for interrupting the first current, and a second switch for interrupting the second current.

According to an embodiment, the voltage drop circuit may further include a voltage drop controller for controlling the first switch and the second switch.

According to an embodiment, the voltage drop control unit may alternately open and close the first switch and the second switch.

According to an embodiment, the voltage drop control unit may open and close the first switch and the second switch at the same period as the resonance period of the resonance circuit.

According to an embodiment, the rectifying circuit may include a first diode that passes the first current and blocks the second current, and a second diode that cuts off the first current and passes the second current.

According to an embodiment, the voltage drop circuit may further comprise an initial charge circuit for initially charging the charge storage circuit.

According to an embodiment, the initial charging circuit includes a charge current limiting circuit for limiting the magnitude of an initial charge current for charging the charge storage circuit, and a first initial charge switch for interrupting an initial charge current supplied to the charge storage circuit .

According to an aspect of the disclosed invention, it is possible to provide an improved voltage drop circuit using zero current switching that performs switching at a time when no current flows using a resonant circuit.

1 shows an apparatus for driving a motor by converting a power supplied from an external power source.
Fig. 2 shows an example of the drive device shown in Fig. 1 and a motor.
FIG. 3 shows an external power source and a power source device according to an embodiment shown in FIG.
4 shows a voltage drop circuit part and a voltage drop control part according to an embodiment.
FIG. 5 shows a current flow when the voltage drop circuit portion according to an embodiment operates in the first operation mode.
6 shows the magnitude of the current supplied to the charge storage circuit when the voltage drop circuit portion according to one embodiment operates in the first operation mode.
7 shows the flow of current when the voltage drop circuit portion according to one embodiment operates in the second operation mode.
8 shows the magnitude of the current supplied to the charge storage circuit when the voltage drop circuit portion according to one embodiment operates in the second operation mode
9 is a diagram for explaining a DC component of a voltage applied to the voltage drop circuit part when the voltage drop circuit part according to one embodiment operates in the first operation mode.
10 is a diagram for explaining a direct current component of a voltage applied to the voltage drop circuit part when the voltage drop circuit part according to the embodiment operates in the second operation mode.
11 is a view for explaining a current and an output voltage flowing in a voltage drop circuit part when the voltage drop circuit part according to one embodiment operates in a first operation mode.
12 shows current and voltage of the voltage drop circuit according to an example of the voltage drop control signal of the voltage drop controller according to an embodiment.
13 shows a current of a voltage drop circuit according to another example of a voltage drop control signal of a voltage drop controller according to an embodiment.
FIG. 14 shows the current of the voltage drop circuit according to another example of the voltage drop control signal of the voltage drop controller according to an embodiment.
15 shows a current of a voltage drop circuit according to another example of a voltage drop control signal of a voltage drop controller according to an embodiment.
16 shows a voltage drop circuit part and a voltage drop control part according to another embodiment.
17 shows a current flow when the voltage drop circuit portion according to another embodiment operates in the first operation mode.
18 shows a current flow when the voltage drop circuit portion according to another embodiment operates in the second operation mode.
19 is a diagram for explaining a direct current component of a voltage applied to the voltage drop circuit part when the voltage drop circuit part according to another embodiment operates in the first operation mode.
20 is a diagram for explaining a direct current component of a voltage applied to the voltage drop circuit part when the voltage drop circuit part according to another embodiment operates in the second operation mode.
FIG. 21 shows a voltage drop circuit part and a voltage drop control part according to another embodiment.
22 shows a voltage drop circuit part and a voltage drop control part according to another embodiment.
23 is a view for explaining the operation of the voltage drop circuit part and the voltage drop control part shown in FIG.
24 is a diagram for explaining the operation of the voltage drop circuit portion and the voltage drop control portion shown in Fig. 22 in the initial charge operation.
25 is a diagram for explaining the operation of the voltage drop circuit part and the voltage drop control part shown in Fig. 22 in normal operation.
FIG. 26 shows a voltage drop circuit part and a voltage drop control part according to another embodiment.
FIG. 27 is a diagram for explaining the operation of the voltage drop circuit portion and the voltage drop control portion shown in FIG. 26; FIG.
28 shows a voltage drop circuit part and a voltage drop control part according to another embodiment.

It is to be understood that the embodiments described herein and the arrangements shown in the drawings are merely preferred embodiments of the disclosed invention and that at the time of filing of the present application there are various modifications that can replace the embodiments and drawings of the present specification .

Hereinafter, embodiments will be described in detail with reference to the accompanying drawings.

1 shows an apparatus for driving a motor by converting a power supplied from an external power source.

1, an external power source 1, a power source device 10, a drive device 50, and a motor 2 may be provided.

The external power source 1 may adopt a single-phase alternating-current power source for household use or a three-phase alternating-current power source for industrial use, or may adopt a direct-current power source supplied through a solar generator or the like.

The power supply apparatus 10 converts an AC voltage and an AC current provided from the external power supply 1 into a DC voltage and a DC current, and drops the converted DC voltage to a voltage required by the drive apparatus 50.

The driving device 50 converts a direct current voltage and a direct current supplied from the power supply device 10 to generate a driving current for driving the motor 2 and supplies the generated driving current to the motor 2. [

The motor 2 receives a driving current from the driving device 50 and rotates a load (not shown) through interaction between a rotor (not shown) and a stator (not shown). The motor 2 may be not only a motor used for a household appliance such as a washing machine, a refrigerator, or an air conditioner, but also a motor used for industrial use.

Hereinafter, for convenience of explanation, it is assumed that the external power source 1 is a three-phase AC power source, and the motor 2 is a three-phase motor.

Fig. 2 shows an example of the drive device shown in Fig. 1 and a motor.

2, the driving apparatus 50 includes a driving circuit unit 60 which receives a DC power from a power supply device 10 to be described later and generates a driving current for driving the motor 2, And a drive control unit 70 for providing a drive control signal to the drive circuit unit 60 based on the drive current.

The drive circuit unit 60 includes two input terminals IN60a and IN60b for receiving direct current power from a power supply device 10 to be described later, three output terminals OUT60a and OUT60b for supplying a drive current to the motor 2, OUT60c and six switches Q61, Q65, Q62, Q66, Q63 and Q67 for generating a drive current to be supplied to the motor 2.

More specifically, as shown in FIG. 2, three upper switches Q61, Q62 and Q63 are connected in parallel to a positive input terminal IN60a and three lower switches Q65, Q63 and Q63 are connected to a negative input terminal IN60b. Q66 and Q67 are connected in parallel. The three upper switches Q61, Q62 and Q63 and the three lower switches Q65, Q66 and Q67 are connected in series on a one-to-one basis, and three upper switches Q61, Q62 and Q63 and three lower switches Q65 , Q66, and Q67 are connected in series to one another, are connected to three output terminals OUT60a, OUT60b, and OUT60c of the driving circuit unit 60, respectively.

The driving circuit unit 60 includes three switches connected in parallel to any one of the three upper switches Q61, Q62 and Q63 connected in parallel to the positive input terminal IN60a and the negative input terminal IN60b, The switches Q65, Q66 and Q67 are turned on in a predetermined order in order to supply the driving current to the motor 2. [

The drive control unit 70 controls the drive control unit 70 based on the drive current supplied to the motor 2 so that either one of the upper switches Q61, Q62 and Q63 and the lower switches Q65, Q66 and Q67 of the drive circuit unit 60 And provides the drive circuit portion 60 with a drive control signal for turning on one switch. Specifically, a drive current supplied to the motor 2 is detected, the position of the rotor (not shown) of the motor 2 is estimated based on the detected drive current, and the position of the estimated rotor (not shown) Generates a drive control signal so that the rotor of the motor 2 rotates at a predetermined speed, and provides the generated drive control signal to the drive circuit unit 60. [

The plurality of switches Q61 to Q63 and Q65 to Q67 included in the driving circuit unit 50 may be an Insulated Gate Bipolar Transistor (IGBT) or Field Effect Transistor (IGBT) for blocking or conducting a high voltage high current, FET) can be employed.

Although the drive circuit portion 50 exemplifies a two-level inverter, the drive circuit portion 60 is not limited to a two-level inverter. For example, the drive 50 may include a multi-level diode clamped inverter or a multi-level T-type neutral point clamped inverter. have.

FIG. 3 shows an external power source and a power source device according to an embodiment shown in FIG.

3, the power supply apparatus 10 includes a rectifying circuit section 20 for rectifying an AC voltage and an AC current provided from an external power supply 1 to a DC voltage and a DC current, a DC voltage And a voltage drop control unit 120 for providing a voltage drop control signal to the voltage drop circuit unit 110. The voltage drop control unit 120 generates a voltage drop control signal to the voltage drop circuit unit 110. The smoothing circuit unit 30 removes the ripple of the ripple- .

The rectifying circuit portion 20 includes three input terminals IN20a, IN20b and IN20c for receiving AC power from the external power supply 1, two output terminals for providing the rectified voltage and current to the smoothing circuit portion 30 OUT20a and OUT20b and six diodes D21, D22, D23, D25, D26 and D27 connected in the form of a bridge.

3, three upper diodes D21, D22 and D23 are connected in parallel to the positive output terminal OUT20a and three lower diodes D25, D22 and D23 are connected to the negative output terminal OUT20b. D26, and D27 are connected in parallel. The three upper diodes D21, D22 and D23 and the three lower diodes D25, D26 and D27 are connected in series on a one-to-one basis and connected in series to the three upper diodes D21, D22 and D23 and the three lower diodes D25 D26 and D27 are connected in series to each other are connected to the input terminals IN20a, IN20b and IN20c of the rectifying circuit portion 20, respectively. Here, the six diodes D21, D22, D23, D25, D26 and D27 are arranged such that the voltage supplied from the external power supply 1 is supplied only in one direction and the current flows in only one direction.

The positive voltage supplied from the external power supply 1 is output to the positive output terminal OUT20a via the upper end diodes D21, D22 and D23 and the negative voltage supplied from the external power supply 1 is supplied to the lower end diode D25 , D26, and D27 to the negative output terminal OUT20b. The current supplied from the external power supply 1 is supplied to the positive output terminal OUT20a of the rectifying circuit portion 20 via the upper diodes D21, D22 and D23 and is supplied to the rectifying circuit portion 20 And the negative output terminal OUT20b of the rectifying circuit section 20 is returned via the lower diodes D25, D26, and D27 of the rectifying circuit section 20. [ That is, even when the alternating-current voltage and the alternating current are supplied from the external power supply 1, the rectifying circuit section 20 can output the direct-current voltage applied in one direction and the direct current flowing in one direction.

Although the rectifier circuit portion 20 exemplifies a three-phase diode bridge, the rectifier circuit portion 20 is not limited to the three-phase diode bridge.

The DC voltage and the DC current output from the rectifying circuit section 20 are supplied to the smoothing circuit section 30.

3, the smoothing circuit portion 30 includes a pair of input terminals IN30a and IN30b for receiving a DC voltage including ripple from the rectifying circuit portion 20, a pair of outputs for outputting a smoothed DC voltage Terminals OUT30a and OUT30b, and a capacitor C31 for storing charge through the direct current supplied from the rectifying circuit portion 20. [

Since the AC voltage of the sinusoidal waveform is supplied from the external power supply 1, the voltage output from the rectifying circuit portion 20 includes a lot of ripples even if rectified by the rectifying circuit portion 20. [ The capacitor C31 of the smoothing circuit portion 30 stores a large amount of electric charge to maintain a constant voltage across the capacitor C31. As a result, even if the DC voltage including the ripple is inputted through the input terminals IN30a and IN30b, the smoothing circuit portion 30 can output the voltage from which the ripple is removed through the output terminals OUT30a and OUT30b.

The DC voltage and the DC current output from the smoothing circuit section 30 are supplied to the voltage drop circuit section 110.

Although the smoothing circuit portion 30 exemplifies a capacitor, the smoothing circuit portion 30 is not limited to a capacitor.

3, the rectifier circuit portion 20, the smoothing circuit portion 30, and the voltage drop circuit portion 110 are illustrated, but the present invention is not limited thereto. For example, it may further comprise a power factor correction (PFC) circuit that improves the power factor of the external power supply 1.

The voltage drop circuit part 110 and the voltage drop control part 120 will be described in detail below.

4 shows a voltage drop circuit part and a voltage drop control part according to an embodiment.

4, the voltage drop circuit unit 110 includes a pair of input terminals IN110a and IN110b for receiving DC power and a pair of output terminals OUT110a and OUT110b for outputting a voltage dropped DC power. A charge storage circuit Co connected in parallel with the pair of output terminals OUT110a and OUT110b, a first switch Q111 and a second switch Q112 connected in series and a series connection between both ends of the charge storage circuit Co, A node where the first diode D111 and the second diode D112 are connected to each other and a node where the first switch Q111 and the second switch Q112 are connected and a node where the first diode D111 and the second diode D112 are connected, And a resonance circuit 111 provided between the resonance circuit 111 and the resonance circuit.

The first switch Q111 and the second switch Q112 intermit the current transmitted from the input terminals IN110a and IN110b to the output terminals OUT110a and OUT110b. Specifically, the first switch Q111 interrupts the current supplied from the input terminals IN110a and IN110b to the resonant circuit 111 and the second switch Q112 interrupts the charge storage circuit Co from the resonant circuit 111. [ The current supplied to the power supply is interrupted.

The first switch Q111 and the second switch Q112 may be an Insulated Gate Bipolar Transistor (IGBT) or a Power Field Effect Transistor (Power FET) for blocking or conducting a high voltage high current, Can be adopted.

The resonant circuit 111 includes a resonant inductor Lr for storing magnetic energy and a resonant capacitor Cr for storing electric energy and the resonant inductor Lr and the resonant capacitor Cr are connected in series. Specifically, the resonant inductor Lr and the resonant capacitor Cr receive the electric current from the input terminals IN110a and IN1110b to store the magnetic energy and the electric energy, store the electric energy in the charge storage circuit Co through the stored magnetic energy and the electric energy, As shown in FIG.

The first diode D111 and the second diode D112 guide the current so that the charge is supplied to the charge storage circuit Co. Specifically, the first diode D111 supplies a current from the input terminals IN110a and IN110b to the charge storage circuit Co, and the second diode D112 supplies current from the resonant circuit 111 to the charge storage circuit Co).

The charge storage circuit Co stores the charge through the current supplied from the input terminals IN110a and IN110b and outputs a voltage lower than the charge applied to the input terminals IN110a and IN110b through the stored charge to the output terminals OUT110a , And OUT110b.

The charge drop control unit 120 controls the first switch Q111 and the second switch Q112 included in the voltage drop circuit unit 110 so that the voltage drop circuit unit 110 outputs a predetermined voltage, And provides the generated first voltage drop control signal and the generated second voltage drop control signal to the voltage drop circuit unit 110. The voltage drop control unit 110 generates the first voltage drop control signal and the second voltage drop control signal.

The voltage drop circuit unit 110 can operate in two modes in accordance with the control signal of the charge / Specifically, the voltage drop circuit unit 110 is configured such that the first operation mode in which the first switch Q111 is closed and the second switch Q112 is opened and the second operation mode in which the first switch Q111 is opened and the second switch Q112 is closed Lt; / RTI > operation mode.

First, the voltage drop performed by the voltage drop circuit unit 110 will be described.

5 is a view for explaining a direct current component of a voltage applied to the voltage drop circuit part when the voltage drop circuit part according to an embodiment operates in the first operation mode, 2 is a diagram for explaining a direct current component of a voltage applied to the voltage drop circuit portion when operating in the operation mode.

When the voltage drop circuit 110 operates in the first operation mode, the voltage applied to the first switch Q111 and the first diode D111 is negligible and can be neglected. The voltage applied to the voltage drop circuit 110 The resonant inductor Lr of the resonant circuit 111 can be ignored. Therefore, the voltage drop circuit unit 110 becomes a simple circuit composed of the resonant capacitor Cr of the resonant circuit 111 and the charge storage circuit Co as shown in Fig.

The input voltage Vi input to the voltage drop circuit 110 is equal to the sum of the voltage VCr applied to the resonant capacitor Cr and the voltage VCo applied to the charge storage circuit Co, The output voltage Vo output by the capacitor 110 is equal to the voltage VCo applied to the charge storage circuit Co.

When the voltage drop circuit unit 110 operates in the second operation mode, the voltage drop circuit unit 110 also detects the resonance capacitor Cr and the charge storage circuit Co of the resonance circuit 111, As shown in Fig.

The output voltage Vo output from the voltage drop circuit 110 and the voltage VCo applied to the charge storage circuit Co are equal to the voltage VCr applied to the resonant capacitor Cr.

Further, since the resonance capacitor Cr constitutes the resonance circuit 111, the DC component of the voltage VCr applied to the resonance capacitor Cr in the first operation mode and the second operation mode does not change.

The voltage VCr applied to the resonance capacitor Cr and the voltage VCo applied to the charge storage circuit Co are equal to each other in the first operation mode and the voltage drop circuit part 110 is connected to the voltage drop circuit part 110 ) Of the input voltage (Vi)

Hereinafter, the current flow in the voltage drop circuit unit 110 when the voltage drop circuit unit 110 operates in the first operation mode and the second operation mode will be described.

FIG. 7 illustrates the flow of current when the voltage drop circuit portion according to an embodiment operates in the first operation mode, and FIG. 8 illustrates the flow of current when the voltage drop circuit portion according to an embodiment operates in the first operation mode. And the magnitude of the current supplied to the power source.

When the first switch Q111 is closed and the second switch Q112 is opened, a current is supplied from the positive input terminal IN110a to the charge storage circuit Co as shown in Fig. Specifically, the current input from the positive input terminal IN110a passes through the closed first switch Q111, the resonant inductor Lr of the resonant circuit 111, the resonant capacitor Cr, and the first diode D111 And supplied to the charge storage circuit Co.

Therefore, the current supplied to the positive input terminal IN110a, the current flowing to the resonant circuit 111, and the current supplied to the charge storage circuit Co are the same. In other words, as described above, the current flowing in the resonant inductor Lr is supplied not only to the resonant capacitor Cr but also to the charge storage circuit Co, and the electric energy supplied from the power supply circuit portion 10 (see FIG. 2) (Cr) as well as the charge storage circuit (Co).

The current flowing through the resonant inductor Lr while the current input from the positive input terminal IN110a passes through the resonant inductor Lr and the resonant capacitor Cr of the resonant circuit 111 increases and then decreases, The voltage across the resonant capacitor Cr becomes high.

8, the current ILr flowing in the resonant circuit 111 gradually increases until the magnitude of the current ILr reaches the maximum point t1 after the first switch Q111 is closed, Is gradually decreased until t2 after reaching the peak.

Specifically, in the first operation mode, a current flows from the positive input terminal IN110a to the charge storage circuit Co in the resonance inductor Lr. As described above, the resonance capacitor Cr and the charge storage circuit Co each output a voltage corresponding to half of the input voltage Vi. However, since the voltage of the resonance capacitor Cr is lowered by the second operation mode to be described later, the input voltage Vi is higher than the sum of the voltage of the resonance capacitor Cr and the voltage of the charge storage circuit Co. Thus, the current flows from the positive input terminal IN110a toward the charge storage circuit Co.

Further, the current flowing in the resonance inductor Lr does not increase rapidly due to the characteristics of the resonance inductor Lr that hinders the change of the current, but gradually increases.

A current equal to the current flowing in the resonant inductor Lr flows in the resonant capacitor Cr and electric energy is accumulated in the resonant capacitor Cr while the current flows to raise the voltage of the resonant capacitor Cr.

When the voltage of the resonant capacitor Cr becomes higher and the sum of the voltage of the resonant capacitor Cr and the voltage of the charge storage circuit Co becomes higher than the input voltage Vi, Since the voltage is applied, the current flowing in the resonant inductor Lr gradually decreases. However, the current flowing in the resonance inductor Lr does not decrease at "0" This is because the first diode D111 prevents a current in the opposite direction from flowing.

FIG. 9 shows a current flow when the voltage drop circuit part according to an embodiment operates in the second operation mode, and FIG. 10 shows a state where the voltage drop circuit part according to an embodiment operates in the second operation mode. And the magnitude of the current supplied to the power source.

When the first switch Q111 is opened and the second switch Q112 is closed, a current is supplied from the resonance capacitor Cr of the resonance circuit 111 to the charge storage circuit Co as shown in Fig. In other words, the current flowing in the resonant inductor Lr is a current also supplied from the resonant capacitor Cr to the charge storage circuit Co, and electric energy is supplied from the resonant capacitor Cr to the charge storage circuit Co.

Specifically, the current provided by the resonant capacitor Cr of the resonant circuit 111 passes through the resonant inductor Lr of the resonant circuit 111 and the second switch Q112 to be supplied to the charge storage circuit Co, And returns to the resonance capacitor Cr of the resonance circuit 111 through the second diode D112. That is, the current flows in the opposite direction to the first operation mode for the resonant circuit 111, and flows in the same direction as the first operation mode for the charge storage circuit Co.

As shown in FIG. 10, the current flowing in the resonant circuit 111 gradually increases in the opposite direction to the first operation mode until the current ILr reaches the lowest point after the second switch Q112 is closed, (ILr) gradually decreases until t4 after reaching the peak in the opposite direction to the first operation mode.

Specifically, in the second operation mode, a current flows from the resonance capacitor Cr to the charge storage circuit Co in the resonance inductor Lr. The voltage of the resonance capacitor Cr is higher than the voltage of the charge storage circuit Co because the voltage of the resonance capacitor Cr is raised by the above-described first operation mode. Thus, the current flows from the resonant capacitor Cr toward the charge storage circuit Co.

In addition, the magnitude of the current flowing through the resonance inductor Lr does not increase sharply and gradually increases due to the characteristics of the resonance inductor Lr that hinders the change of the current.

A current equal to the current flowing in the resonant inductor Lr flows in the resonant capacitor Cr and the voltage of the resonant capacitor Cr is lowered since electric energy is emitted to the resonant capacitor Cr during the current flow.

When the voltage of the resonance capacitor Cr is lowered and the voltage of the resonance capacitor Cr becomes lower than the voltage of the charge storage circuit Co, the voltage opposite to the current direction is applied to both ends of the resonance inductor Lr, ) Gradually decreases.

However, the current flowing in the resonance inductor Lr does not decrease at "0" This is because the second diode D113 prevents a current in the opposite direction from flowing.

Hereinafter, the change of the output voltage with time of the voltage drop circuit unit 110 will be described.

11 is a view for explaining a current and an output voltage flowing in a voltage drop circuit part when the voltage drop circuit part according to one embodiment operates in a first operation mode.

The relation between the current iCr flowing through the resonant capacitor Cr and the voltage vCr applied across the resonant capacitor Cr can be expressed by Equation 1 as follows: And this is solved with respect to the voltage vCr applied across the resonance capacitor Cr.

[Equation 1]

(Where iCr is the current flowing through the capacitor, Cr is the capacitance of the capacitor, vCr is the voltage across the capacitor, and d / dt is the differential operator).

&Quot; (2) "

(Where Vcr is the voltage applied to the capacitor, Cr is the capacitance, icr is the current flowing through the capacitor, ∫dt is the integral operator, and Vx is the DC component of the voltage applied to the capacitor).

Here, ∫iCrdt / Cr represents the AC component of the voltage applied to the capacitor.

The current iLr flowing in the resonant inductor Lr and the voltage vLr applied across the resonant inductor Lr have the relationship as shown in Equation 3. [

&Quot; (3) "

(Where vLr is the voltage applied across the inductor, Lr is the inductance, iLr is the current flowing through the inductor, and d / dt is the differential operator).

11, when the voltage drop circuit unit 110 operates in the first operation mode, the input voltage Vi is expressed by a voltage vCr applied to the resonant capacitor Cr as shown in Equation (4) (VLr) and the output voltage (Vo) applied to the output terminal (Lr). The current iCr flowing through the resonance capacitor Cr and the current iLr flowing through the resonance inductor Lr are the same.

&Quot; (4) "

(Where Vi is the input voltage, Lr is the inductance, iLr is the current flowing through the inductor, d / dt is the differential operator, vCr is the AC component of the voltage applied to the capacitor, Vo is the output voltage, and Vx is the voltage applied to the capacitor DC component.)

(5) is obtained by substituting the AC component of the voltage applied to the resonance capacitor (Cr) shown in the equation (2) in the equation (4).

&Quot; (5) "

(Where Vi is the input voltage, Lr is the inductance, iLr is the current flowing through the inductor, d / dt is the differential operator, Cr is the capacitance, iLr is the current flowing through the inductor, ∫dt is the integral operator, Vo is the output voltage, This is the DC component of the voltage applied to the capacitor.)

Laplace transformation of equation (5) results in equation (6).

&Quot; (6) "

(S) is the Laplace transformed input voltage, Lr is the inductance, ILr (s) is the Laplace transformed inductor current, Cr is the capacitance, Vo (s) is the Laplace transformed output voltage, Vx This is the DC component of the voltage of the Laplace transformed clamper.)

(6) is relationalized with respect to the current ILr (s) of the Laplace transformed resonant inductor Lr.

&Quot; (7) "

(S) is the Laplace transformed input voltage, Lr is the inductance, ILr (s) is the Laplace transformed inductor current, Cr is the capacitance, Vo (s) is the Laplace transformed output voltage, Vx This is the DC component of the voltage of the Laplace transformed clamper.)

(8) of the Laplace transformed resonant inductor Lr for inverse Laplace transformation of Equation (7), the following equation (8) is obtained.

&Quot; (8) "

(S) is the Laplace transformed input voltage, Lr is the inductance, ILr (s) is the Laplace transformed inductor current, Cr is the capacitance, Vo (s) is the Laplace transformed output voltage, Vx This is the DC component of the voltage of the Laplace transformed clamper.)

(8) is rearranged to inverse Laplace transform, the following equation (9) is obtained.

&Quot; (9) "

(S) is the Laplace transformed input voltage, Lr is the inductance, ILr (s) is the Laplace transformed inductor current, Cr is the capacitance, Vo (s) is the Laplace transformed output voltage, Vx This is the DC component of the voltage of the Laplace transformed clamper.)

The inverse Laplace transform of equation (9) yields equation (10).

&Quot; (10) "

(Where iLr is the inductor current, Vi is the input voltage, Vo is the output voltage, Vx is the DC component of the capacitor voltage, Cr is the capacitance, and Lr is the inductance).

In order to calculate the current flowing through the resonance inductor Lr or the resonance capacitor Cr, the value of Vx must be defined. As shown in FIG. 11, Vx is a difference Vi between the input voltage Vi and the output voltage Vo -Vo) minus? Vx.

With respect to? Vx,? Vx is the amplitude of the AC component of the capacitor Cr, and the product of? Vx and the capacitance is equal to half of the charge charged by the current iCr of the resonant capacitor Cr. This can be expressed by Equation (11).

At this time, the current iCr of the resonant capacitor Cr is the same as the current iLr of the resonant inductor Lr, and during the time Ts / 2 of the first operation mode of the current iCr of the resonant capacitor Cr The integrated value is equal to the product of the current Iin flowing average to the resonant inductor Lr during the first operation mode and the time Ts / 2 of the first operation mode. The current Iin flowing on the average to the resonance inductor Lr is equal to the current input to the voltage drop circuit 110 in an average manner.) Further, the voltage drop controller 120 controls the operation time of the first operation mode and the operation time of the second Twice the operating time Ts / 2 of the first operation mode becomes equal to the resonance period Ts if the sum of the operating time of the operating mode is equal to the resonance period of the resonance circuit 111, ) ≪ / RTI >

&Quot; (11) "

Ts is an operation time of the first operation mode,? Dt is an integral operator, Iin is an integral operator,? Is an operation time of the second operation mode, The average current input to the voltage drop circuit, and f is the resonant frequency of the resonant circuit.)

The direct-current component Vx of the voltage of the resonant capacitor Cr is calculated by using the equation (11).

&Quot; (12) "

(Where Vx is a DC component of the voltage of the capacitor, Vi is an input voltage, Vo is an output voltage, Cr is a capacitance, f is a resonance frequency, and Iin is an average current input during the first operation mode.

Substituting Equation (12) into Equation (10) results in Equation (13).

&Quot; (13) "

(Where iLr is the current of the inductor and capacitor, Cr is the capacitance, Lr is the inductance, f is the resonant frequency of the resonant circuit, and Iin is the average current input to the voltage drop circuit).

The voltage vCr applied to the resonant capacitor Cr is given by Equation (14), and can be obtained by substituting Equation (13) into Equation (2).

&Quot; (14) "

(Where VCr is the voltage of the capacitor, Iin is the average current input to the voltage drop circuit, Cr is the capacitance, Lr is the inductance, f is the resonant frequency of the resonant circuit, and Vi is the input voltage.)

The voltage of the resonant inductor Lr and the resonant capacitor Cr and the voltage of the resonant capacitor Cr can be calculated by the method described above even when the voltage drop circuit unit 110 operates in the second operation mode.

12 shows current and voltage of the voltage drop circuit according to an example of the voltage drop control signal of the voltage drop controller according to an embodiment. 12A shows an example of a first voltage drop control signal G111 for opening and closing the first switch Q111 and a second voltage drop control signal G112 for opening and closing the second switch Q112 12B shows the current ILr flowing in the resonant inductor Lr of the resonant circuit 111 according to the voltage drop control signals G111 and G112 shown in Fig. FIG. 12C shows the current ICo supplied to the charge storage circuit Co, and FIG. 12D shows the voltage VCr of the resonant capacitor Cr.

The period of the voltage drop control signals G111 and G112 output to the voltage drop controller 120 is set to a voltage level of the voltage drop control signal G111, Lt; RTI ID = 0.0 > 111 < / RTI >

Specifically, the voltage drop controller 120 outputs the first voltage drop control signal G111 so that the first switch Q111 is closed between 0 and t2, and the second voltage drop control And outputs the signal G112. Thereafter, the voltage drop controller 120 outputs the first voltage drop control signal G111 so that the first switch Q111 is opened between t2 and t4, and the second voltage drop control signal G111 is closed so that the second switch Q112 is closed. (G112). That is, the voltage drop control unit 120 outputs square wave type voltage drop control signals G111 and G112 having a period of 2 t1.

In the resonant inductor Lr, a current having a positive sinusoidal waveform flows between 0 and t1, no current flows between t1 and t2, a current having a sinusoidal waveform flows between t2 and t3, and at t3 No current flows between t4. That is, the resonant period of the resonant circuit 111 is 2 t1. In the resonance circuit 111, currents in positive and negative directions alternately flow, but a current in the positive direction is always supplied to the charge storage circuit Co. This is because of the opening and closing operations of the first switch Q111 and the second switch Q112 and the rectifying function of the first diode D111 and the second diode D112.

Therefore, when the first and second switches Q111 and Q112 switch according to the voltage drop control signals G111 and G112 of the voltage drop controller 120, the voltage drop circuit unit 110 generates a zero current switching It is possible.

If the period of the voltage drop control signals G111 and G112 output from the voltage drop controller 120 matches or is similar to the resonance period of the resonance circuit 111 included in the voltage drop circuit unit 110, The charge is continuously supplied to the charge storage circuit Co, and the output voltage Vo can be maintained at 1/2 of the input voltage Vi.

The voltage VCr of the resonant capacitor Cr changes in accordance with the current iCr of the resonant capacitor Cr as shown in Fig. 12 (d).

13 shows a current of a voltage drop circuit according to another example of a voltage drop control signal of a voltage drop controller according to an embodiment. 13 (a) shows another example of the first voltage drop control signal G111 and the second voltage drop control signal G112. FIG. 13 (b) The current supplied to the charge storage circuit Co in accordance with the voltage drop control signals G111 and G112 shown in FIG.

Referring to FIG. 13A, the period (2 t2) of the voltage drop control signals G111 and G112 output from the voltage drop controller 120 is divided into a resonant circuit 111 included in the voltage drop circuit 110, (2 < / RTI > t < 2 >).

13B, the first switch Q111 or the second switch Q112 is turned on according to the voltage drop control signals G111 and G112 in the charge storage circuit Co of the voltage drop circuit unit 110, The current is supplied for a half of the resonance period of the resonant circuit 111.

As a result, a small amount of charge is supplied to the charge storage circuit Co as compared with that shown in FIG. 12C, and the output voltage Vo of the charge storage circuit Co is half of the input voltage Vi And the charge storage circuit Co outputs a voltage smaller than half of the input voltage Vi.

FIG. 14 shows the current of the voltage drop circuit according to another example of the voltage drop control signal of the voltage drop controller according to an embodiment. 14 (a) shows another example of the first voltage drop control signal G111 and the second voltage drop control signal G112, and FIG. 14 (b) The current supplied to the charge storage circuit Co in accordance with the voltage drop control signals G111 and G112 shown in Fig.

14A, the voltage drop control signals G111 and G112 output from the voltage drop controller 120 are similar to half the resonance periods of the resonance circuit 111 included in the voltage drop circuit 110, And turns on the first and second switches Q111 and Q112 for a period of time.

Referring to (b) of FIG. 14, a resonance current is supplied to the charge storage circuit Co during the time when the first and second switches Q111 and Q112 are turned on. However, since the first and second switches Q111 and Q112 are turned off for a considerable period of time after the first and second switches Q111 and Q112 are turned on alternately, the current is not supplied to the charge storage circuit Co Do not.

As a result, a small amount of charge is supplied to the charge storage circuit Co as compared with that shown in FIG. 12C, and the output voltage Vo of the charge storage circuit Co is half of the input voltage Vi And the charge storage circuit Co outputs a voltage smaller than half of the input voltage Vi.

15 shows a current of a voltage drop circuit according to another example of a voltage drop control signal of a voltage drop controller according to an embodiment. 15 (a) shows another example of the first voltage drop control signal G111 and the second voltage drop control signal G112, and FIG. 15 (b) The current supplied to the charge storage circuit Co in accordance with the voltage drop control signals G111 and G112 shown in Fig.

Referring to FIG. 15A, the first switch Q111 has a period similar to the resonance period of the resonant circuit 111 and repeats turn-on and turn-off. Further, the second switch Q112 is turned off when the first switch Q111 is turned on. In particular, the second switch Q112 is turned on once when the first switch Q111 is turned on twice.

Referring to FIG. 15B, the first switch Q111 is turned on immediately after the second switch Q112 is turned on and after the second switch Q112 is turned on in the charge storage circuit Co Current is supplied. Specifically, since the first switch Q111 is turned on between 0 and t2, a current is supplied to the charge storage circuit Co, and since the second switch Q112 is not turned on between t2 and t4, No current is supplied. Also, between t4 and t5, the first switch Q111 is turned on, but no current is supplied to the charge storage circuit Co. This is because the second switch Q112 is not turned on between t2 and t4. Between t5 and t7, the second switch Q112 is turned on, so that the current is supplied to the charge storage circuit Co, and the first-stage switch Q111 is turned on from t7 to t9, .

As a result, a small amount of charge is supplied to the charge storage circuit Co as compared with that shown in FIG. 12C, and the output voltage Vo of the charge storage circuit Co is half of the input voltage Vi And the charge storage circuit Co outputs a voltage smaller than half of the input voltage Vi.

The voltage drop circuit part and the voltage drop control part according to the embodiment have been described above. Hereinafter, the voltage drop circuit part and the voltage drop control part according to another embodiment will be described. In addition, a description of the power supply device using the voltage drop circuit part and the voltage drop control part according to another embodiment will be omitted.

16 shows a voltage drop circuit part and a voltage drop control part according to another embodiment.

The voltage drop circuit part 210 drops the direct current voltage, and the voltage drop control part 220 provides the voltage drop control part 210 with the voltage drop control signal.

16, the voltage drop circuit unit 210 includes a pair of input terminals IN210a and IN210b for receiving a DC voltage, a pair of output terminals OUT210a and OUT210b for outputting a voltage dropped DC voltage, A first switch Q211 and a second switch Q212 serially connected between an input terminal IN210a and a positive output terminal OUT210a and a second switch Q212 connected in series between a pair of output terminals OUT210a and OUT210b, A first diode D211 and a second diode D212 connected in series between both ends of the first charge storage circuit Co1 and the second charge storage circuit Co1, A third diode D213 and a fourth diode D214 which are connected in series between the two ends of the first diode D211 and the second diode D211 and a node where the first switch Q211 and the second switch Q212 are connected, A first resonant circuit 211 provided between the nodes to which the diode D212 is connected, a first resonant circuit 211 connected to the node Q212, to which the first switch Q211 and the second switch Q212 are connected, And a second resonant circuit 212 provided at a node to which the third diode D213 and the fourth diode D214 are connected. The first resonant circuit 211 and the second resonant circuit 212 include one Resonant inductor Lr1.

The first switch Q211 and the second switch Q212 interrupts the flow of currents transmitted from the input terminals IN210a and IN210b to the output terminals OUT210a and OUT210b. Specifically, the first switch Q211 interrupts the current supplied from the input terminals IN210a and IN210b to the first resonant circuit 211 and the second resonant circuit 212, and the second switch Q212 interrupts the current supplied to the first The current supplied from the resonance circuit 211 and the second resonance circuit 212 to the first charge storage circuit Co1 and the second charge storage circuit Co2 is interrupted.

The first switch Q211 and the second switch Q212 may be an Insulated Gate Bipolar Transistor (IGBT) or a Power Field Effect Transistor (Power FET) for blocking or conducting a high voltage high current, Can be adopted.

The first resonant circuit 211 includes a resonant inductor Lr1 for storing magnetic energy and a first resonant capacitor Cr1 for storing electrical energy and the resonant inductor Lr1 and the first resonant capacitor Cr1 are connected in series Lt; / RTI > The second resonant circuit 212 includes a resonant inductor Lr1 for storing magnetic energy and a second resonant capacitor Cr2 for storing electrical energy and the resonant inductor Lr1 and the second resonant capacitor Cr2 are connected in series Lt; / RTI > The first resonant circuit 211 and the second resonant circuit 212 share one resonant inductor Lr1 as shown in Fig.

The first diode D211 and the second diode D212 guide the current so that the charge is supplied to the first charge storage circuit Co1 and the third diode D213 and the fourth diode D214 charge the second And guides the current to be supplied to the charge storage circuit Co2.

The first charge storage circuit Co1 and the second charge storage circuit Co2 store the charge through the current supplied from the input terminals IN210a and IN210b and are supplied to the input terminals IN210a and IN210b through the stored charge So that the lowered voltage is outputted to the output terminals OUT210a and OUT210b.

The charge drop controller 220 controls the first switch Q211 and the second switch Q212 included in the voltage drop circuit unit 210 so that the voltage drop circuit unit 210 outputs a predetermined voltage, And provides the generated first voltage drop control signal and the generated second voltage drop control signal to the voltage drop circuit unit 210. The voltage drop control unit 210 generates the first voltage drop control signal and the second voltage drop control signal.

The voltage drop circuit unit 210 can operate in two modes according to the control signal of the charge / Specifically, the voltage-drop circuit unit 210 is configured such that the first operation mode in which the first switch Q211 is closed and the second switch Q212 is opened and the second operation mode in which the first switch Q211 is opened and the second switch Q212 is closed Lt; / RTI > operation mode.

First, the voltage drop performed by the voltage drop circuit 210 will be described.

FIG. 17 is a view for explaining a DC component of a voltage applied to the voltage drop circuit part when the voltage drop circuit part according to another embodiment operates in the first operation mode, and FIG. 20 is a view for explaining a DC component of the voltage drop circuit part according to another embodiment. Is a diagram for explaining a direct current component of a voltage applied to the voltage drop circuit portion when operating in the second operation mode.

The voltage drop circuit part 210 may be represented by a simple circuit composed of the first and second resonance capacitors Cr1 and Cr2 and the first and second charge storage circuits Co1 and Co2 as shown in Figs. .

In the first operation mode, the input voltage Vi is equal to the sum of the voltage VCr2 of the second resonant capacitor Cr2 and the output voltage Vo as shown in Equation (15), and the voltage of the first resonant capacitor Cr1 The voltage VCo1 of the first charge storage circuit Co1 and the voltage VCo2 of the second charge storage circuit Co2.

&Quot; (15) "

(Where Vi is the input voltage, VCr1 is the voltage of the first capacitor, VCr2 is the voltage of the second capacitor, VCo1 is the voltage of the first charge storage circuit, and VCo2 is the voltage of the second charge storage circuit.

The voltage VCr1 of the first resonance capacitor Cr1 in the second operation mode is equal to the voltage VCo1 of the first charge storage circuit Co1 as shown in Equation 16 and the voltage VCr1 of the second resonance capacitor Cr2 VCr2 is equal to the sum of the voltage VCo1 of the first charge storage circuit Co1 and the voltage VCo2 of the second charge storage circuit Co2 as shown in Equation 17. [

&Quot; (16) "

(Where VCr1 is the voltage of the first capacitor and VCo1 is the voltage of the first charge storage circuit).

&Quot; (17) "

(Where VCr2 is the voltage of the second capacitor, VCo1 is the voltage of the first charge storage circuit, and VCo2 is the voltage of the second charge storage circuit).

When the equations (16) and (17) are combined, the input voltage (Vi) becomes Equation (18).

&Quot; (18) "

(Where Vi is the input voltage, VCo1 is the voltage of the first charge storage circuit, and VCo2 is the voltage of the second charge storage circuit).

According to the expression (18), the voltage (VCo1) of the first charge storage circuit (Co1) and the voltage (VCo2) of the second charge storage circuit (Co2)

&Quot; (19) "

(Where Vi is the input voltage, VCo1 is the voltage of the first charge storage circuit, and VCo2 is the voltage of the second charge storage circuit).

The output voltage Vo is equal to the sum of the voltage VCo1 of the first charge storage circuit Co1 and the voltage VCo2 of the second charge storage circuit Co2 and is equal to two thirds of the input voltage Vi . That is, the voltage drop circuit part 210 according to the second embodiment of the disclosed invention outputs 2/3 of the input voltage Vi

Hereinafter, the current flow in the voltage drop circuit part 210 when the voltage drop circuit part 210 operates in the first operation mode and the second operation mode will be described.

FIG. 19 shows a current flow when the voltage drop circuit portion according to another embodiment operates in the first operation mode.

Referring to Fig. 19, in the first operation mode, current is supplied from the positive input terminal IN210a. A part of the current supplied from the positive input terminal IN210a flows through the first switch Q211 and the resonance inductor Lr1 of the first resonance circuit 211 and the first resonance capacitor Cr1 and the first diode D211 And the remaining current is supplied to the first switch Q211, the resonance inductor Lr1 and the second resonance capacitor Cr2 of the second resonance circuit 212, the third resonance capacitor Cr2, And is supplied to the second charge storage circuit Co2 through the diode D213.

The current flowing in the resonant inductor Lr1 and the first and second resonant capacitors Cr1 and Cr2 gradually increases and then decreases gradually in the first operation mode. Further, since electric energy is accumulated in the first and second resonance capacitors Cr1 and Cr2, the voltages of the first and second resonance capacitors Cr1 and Cr2 gradually increase.

20 is a view showing a current flow when the voltage drop circuit portion according to another embodiment operates in the second operation mode.

Referring to FIG. 20, in the second mode of operation current is supplied from the first and second resonant capacitors Cr1 and Cr2. The current supplied from the first resonance capacitor Cr1 passes through the resonant inductor Lr1 and the second switch Q212 and is supplied to the first charge storage circuit Co1 and passes through the second diode D212, And returns to the resonance capacitor Cr1. The current supplied from the second resonance capacitor Cr2 passes through the resonance inductor Lr1, the second switch Q212 and the first charge storage circuit Co1 and is supplied to the second charge storage circuit Co2, And returns to the second resonance capacitor Cr2 through the fourth diode D214.

The direction of the current flowing in the resonant inductor Lr1 and the first and second resonant capacitors Cr1 and Cr2 during the second mode of operation is opposite to the first mode of operation and the magnitude gradually increases and then decreases gradually. In addition, since the first and second resonance capacitors Cr1 and Cr2 emit electrical energy, the voltages of the first and second resonance capacitors Cr1 and Cr2 gradually decrease.

FIG. 21 shows a voltage drop circuit part and a voltage drop control part according to another embodiment.

Referring to FIG. 21, a voltage drop circuit part 310 and a voltage drop control part 320 are provided.

The voltage drop circuit unit 310 includes a first switch Q311 and a second switch Q312, a charge storage circuit Co, a first diode D311 and a second diode D312, a resonance circuit 311, And a capacitor C310.

The first switch Q311 and the second switch Q312 are provided between the input terminals IN310a and IN320b for receiving the DC power and the output terminals OUT310a and OUT310b for outputting the voltage dropped DC power, (Q311) and the second switch (Q312) are connected in series with each other. The first switch Q311 interrupts the current input to the resonant circuit 311 and the second switch Q312 interrupts the current output from the resonant circuit 311. [

The charge storage circuit Co is provided between the output terminals OUT310a and OUT310b and outputs a voltage-dropped voltage.

The first diode D311 and the second diode D312 are provided between both ends of the charge storage circuit Co and the first diode D311 and the second diode D312 are connected in series with each other. The first diode D311 allows the current to flow from the input terminal IN310a to the charge storage circuit Co via the resonant circuit 311, but blocks the current in the opposite direction. The second diode D312 also allows current to flow from the resonant circuit 311 to the charge storage circuit Co, but blocks current in the opposite direction.

The resonance circuit 311 is provided between a node to which the first switch Q311 and the second switch Q312 are connected and a node to which the first diode D311 and the second diode D312 are connected, And includes a resonant inductor Lr and a resonant capacitor Cr.

During the first operation mode in which the first switch Q311 is turned on, the resonance circuit 311 accumulates electric energy in the resonance capacitor Cr using the resonance phenomenon between the resonance inductor Lr and the resonance capacitor Cr, During the second operation mode in which the second switch Q312 is turned on, the resonance circuit 311 transfers the electric energy stored in the resonance capacitor Cr to the charge storage circuit Co using the resonance phenomenon.

The initial charge capacitor C310 supplies electric energy to the charge storage circuit Co when the charge storage circuit Co is fully discharged.

In order to store the electric energy in the resonance capacitor Cr using the resonance phenomenon and supply the stored electric energy to the charge storage circuit Co using the resonance phenomenon, The storage circuit Co must be charged with electric energy corresponding to half of the input voltage Vi.

For this reason, it is preferable to provide a separate circuit for initially charging the resonant capacitor Cr and the charge storage circuit Co.

The initial charge capacitor C310 initially charges the charge storage circuit Co by supplying electrical energy to the charge storage circuit Co before the first switch Q311 and the second switch Q312 perform the switching operation.

In order to charge the electric charge corresponding to one half of the input voltage Vi to the charge storage circuit Co, the initial charge capacitor C310 preferably has the same capacitance as the charge storage circuit Co.

The voltage drop controller 320 outputs a first voltage drop control signal G311 for controlling the first switch Q311 and a first voltage drop control signal G312 for controlling the second switch Q312.

The operation of the voltage drop circuit part 310 and the voltage drop control part 320 will be described.

The voltage drop circuit unit 310 and the voltage drop control unit 320 are first supplied with power and the voltage drop control unit 320 supplies a voltage for turning off the first switch Q311 and the second switch Q312 during a predetermined initial charge time And outputs descent control signals G311 and G312.

The initial charge time means a time for the charge storage circuit Co to be initially charged by the initial charge capacitor C310.

When the initial charge time has elapsed, the voltage drop controller 320 controls the voltage drop control signal (Q311) so that the first switch Q311 and the third switch Q312 alternately turn on and off according to the resonance period of the resonance circuit 311 G311, and G312.

22 shows a voltage drop circuit part and a voltage drop control part according to another embodiment.

Referring to FIG. 22, a voltage drop circuit part 410 and a voltage drop control part 420 are provided.

The voltage drop circuit part 410 includes a first switch Q411 and a second switch Q412, a charge storage circuit Co, a first diode D411 and a second diode D412, a resonant circuit 411, A limiting circuit Z410, a first initial charge switch Q413, and a second initial charge switch Q414.

The first switch Q411 and the second switch Q412, the charge storage circuit Co, the first diode D411 and the second diode D412, and the resonance circuit 411 are connected to the first switch The second switch Q311, the second switch Q312, the charge storage circuit Co, the first diode D311, the second diode D312 and the resonant circuit 311, and therefore the description thereof will be omitted.

The charge current limiting circuit Z410, the first initial charge switch Q413 and the second initial charge switch Q414 initially charge the initially discharged resonant capacitor Cr and the charge storage circuit Co.

Specifically, the charge current limiting circuit (Z410) limits the current so that no overcurrent is supplied to the resonant capacitor (Cr) and the charge storage circuit (Co) during the initial charge. For example, when the charge current limiting circuit (Z410) includes a resistive circuit, the resistance value of the resistive circuit limits the amount of current supplied to the resonant capacitor (Cr) and the charge storage circuit (Co).

The initial charge current is determined by the impedance of the charge current limiting circuit Z410 and is determined by the impedance of the initial charge time countercharger charge current limiting circuit Z410. In other words, the initial charge current value and the initial charge time can be changed by changing the impedance of the charge current limiting circuit Z410.

The first initial charge switch Q413 interrupts the initial charge current supplied to the resonant capacitor Cr and the charge storage circuit Co. Specifically, when the first initial charge switch Q413 is turned on, the initial charge current can be supplied to the resonant capacitor Cr and the charge storage circuit Co through the charge current limit circuit Z410.

The charging current limiting circuit Z410 and the first initial charging switch Q413 are connected in series and the charging current limiting circuit Z410 and the first initial charging switch Q413 connected in series are connected to the positive input terminal IN410a, And is provided between one side of the storage circuit Co.

The second initial charge switch Q414 interrupts the initial charge current supplied to the resonant capacitor Cr. Specifically, when the first initial charge switch Q414 and the second initial charge switch Q414 are turned on, the initial charge current can be supplied to the resonant capacitor Cr through the charge current limit circuit Z410.

The second initial charge switch Q414 is provided between one side of the resonance capacitor Cr and the negative input terminal IN410b. That is, the second initial charge switch Q414 is connected in parallel with the second diode D412.

If the second initial charge switch Q414 and the second diode D412 are integrated, an insulated gate bipolar transistor (IGBT) or a field effect transistor (FET) may be employed. This is because the diode which is parasitic to the insulated gate bipolar transistor or the field effect transistor blocks the current from the resonant diode Cr to the negative input terminal IN410b but the current from the negative output terminal OT410b to the resonant diode Cr Is passed.

The voltage drop control unit 420 includes a first voltage drop control signal G411 for controlling the first switch Q411, a first voltage drop control signal G412 for controlling the second switch Q412, A first initial charge control signal G413 for controlling the first charge control signal Q413 and a second initial charge control signal G414 for controlling the second initial charge switch Q413.

However, the voltage drop controller 420 is not limited thereto, and the voltage drop controller 420 may not separately provide the first initial charge control signal G413 and the second initial charge control signal G414, The first initial charge switch Q413 and the second initial charge switch Q414 may be controlled.

FIG. 23 is a view for explaining the operation of the voltage drop circuit part and the voltage drop control part shown in FIG. 22, and FIG. 24 is a view for explaining the operation of the voltage drop circuit part and the voltage drop control part shown in FIG. 25 is a view for explaining the operation of the voltage drop circuit portion and the voltage drop control portion shown in FIG. 22 during normal operation.

23, the operations of the voltage drop circuit part 410 and the voltage drop control part 420 are the same as those of the first embodiment in which the initial charging operation for initial charging the resonant capacitor Cr and the charge storage circuit Co, And a steady state operation in which electric energy is supplied to the charge storage circuit Co.

During the initial charging operation, the voltage drop control unit 420 outputs first and second initial charge control signals G413 and G414 (see FIG. 23A) for turning on the first and second initial charge switches Q413 and Q414, And outputs a first voltage drop control signal G411 for turning off the first switch Q411 and a second voltage drop control signal G412 for turning on the second switch Q412.

However, when the insulated gate bipolar transistor (IGBT) or the field effect transistor (FET) is employed as the first switch Q411 and the second switch Q412, the resonance capacitor Cr may be used without turning on the second switch Q412. An initial charge current may be supplied to the battery. This is because the diode which is parasitic to the insulated gate bipolar transistor or the field effect transistor blocks the current from the positive input terminal IN410a to the positive output terminal OUT410a but from the positive output terminal OUT410a to the positive input terminal IN410a ) Is passed through.

An initial charge current is supplied to the resonance capacitor Cr and the charge storage circuit Co as shown in Figure 23 (b) by such control signals G411 to G414, the voltages of the resonant capacitor Cr and the charge storage circuit Co become high as shown in Figs.

For example, when the input voltage Vi is 600V, the resonance inductor Lr has an inductance of 15uH, the resonance capacitor Cr has a capacitance of 3.3uF, the charge storage circuit Co has a capacitance of 30uF, When the resistance of the limiting circuit Z410 is 7 k ?, the voltage of the resonant capacitor Cr and the charge storage circuit Co becomes half of the input voltage Vi when 160 ms elapses as shown in Fig. 24 (a) The corresponding 300V is reached.

When the voltages of the resonant capacitor Cr and the charge storage circuit Co reach 300V, the voltage drop controller 420 turns off the first and second initial charge switches Q413 and Q414, And outputs signals G413 and G414.

The resonance circuit 411 is supplied with a current of several tens mA as shown in Fig. 24 (b).

During the normal operation, the voltage drop control unit 420 generates first and second initial charge control signals G413 and G414 for turning off the first and second initial charge switches Q413 and Q414, as shown in FIG. 23 (a) And G414 and outputs first and second voltage drop control signals G411 and G412 for alternately turning on / off the first switch Q411 and the second switch Q412.

By the control signals G411 to G414, a sinusoidal current is supplied to the resonance capacitor Cr as shown in Fig. 23 (b). That is, supply of current to the resonant capacitor Cr and emission of current from the resonant capacitor Cr are repeated.

23 (c), the voltage of the resonance capacitor Cr oscillates in the form of a sine wave around Vi / 2, and the voltage of the charge storage circuit Co is set to and is constantly output as Vi / 2 as shown in (d).

For example, if the input voltage Vi is 600V, the resonance inductor Lr has an inductance of 15uH, the resonance capacitor Cr has a capacitance of 3.3uF, the charge storage circuit Co has a capacitance of 30uF, When the switching frequency of the switch Q411 and the second switch Q412 is 25 kHz, the voltage of the charge storage circuit Co has ripple of 20 V around 300 V as shown in Fig. 25 (a).

Further, a sinusoidal current as shown in Fig. 25 (b) flows through the resonance circuit 411.

FIG. 26 shows a voltage drop circuit part and a voltage drop control part according to another embodiment.

Referring to FIG. 26, a voltage drop circuit part 510 and a voltage drop control part 520 are provided.

The voltage drop circuit unit 510 includes a first switch Q511 and a second switch Q512, a charge storage circuit Co, a first diode D511 and a second diode D512, a resonance circuit 511, A limiting circuit Z510, a first initial charge switch Q513, and a second initial charge switch Q514.

21 for the first switch Q511 and the second switch Q512, the charge storage circuit Co, the first diode D511 and the second diode D512 and the resonance circuit 511, The second switch Q311, the second switch Q312, the charge storage circuit Co, the first diode D311, the second diode D312 and the resonant circuit 311, and therefore the description thereof will be omitted.

The charge current limiting circuit Z510, the first initial charge switch Q513 and the second initial charge switch Q514 initial charge the initially discharged resonant capacitor Cr and the charge storage circuit Co.

Specifically, the charging current limiting circuit Z510 limits the current so that no overcurrent is supplied to the resonance capacitor Cr and the charge storage circuit Co at the time of initial charging, and the first initial charging switch Q513 is connected to the resonance capacitor Cr and the initial charge current supplied to the charge storage circuit Co are interrupted.

The charging current limiting circuit Z510 and the first initial charging switch Q13 are connected in series and the charging current limiting circuit Z510 and the first initial charging switch Q513 connected in series are connected to the positive input terminal IN510a, 1 switch Q511 and the second switch Q512 are connected.

The second initial charge switch Q514 interrupts the initial charge current supplied to the resonant capacitor Cr and the second initial charge switch Q514 is provided between the resonant capacitor Cr and the negative input terminal IN510b . That is, the second initial charge switch Q514 is connected in parallel with the second diode D512.

The voltage drop control unit 520 includes a first voltage drop control signal G511 for controlling the first switch Q511, a first voltage drop control signal G512 for controlling the second switch Q512, A first initial charge control signal G513 for controlling the first charge control signal Q513 and a second initial charge control signal G5414 for controlling the second initial charge switch Q513.

FIG. 27 is a diagram for explaining the operation of the voltage drop circuit portion and the voltage drop control portion shown in FIG. 26; FIG.

Referring to FIG. 27, during the initial charging operation, the voltage drop controller 520 sets the first and second initial charge (Q513, Q514) for turning on the first and second initial charge switches Q513, Q514 as shown in FIG. And outputs a first voltage drop control signal G511 for turning off the first switch Q511 and a second voltage drop control signal G512 for turning on the second switch Q512 to output the control signals G513 and G514, do.

The initial charge current is supplied to the resonance capacitor Cr and the charge storage circuit Co as shown in Fig. 27 (b) by the control signals G511 to G514, the voltages of the resonant capacitor Cr and the charge storage circuit Co become high as shown in Figs.

During the normal operation, the voltage drop controller 520 sets the first and second initial charge control signals G513 and Q514 to turn off the first and second initial charge switches Q513 and Q514, And G514 and outputs first and second voltage drop control signals G511 and G12 for alternately turning on / off the first switch Q511 and the second switch Q512.

27 (c), the voltage of the resonant capacitor Cr vibrates in the form of a sine wave around Vi / 2, and the voltage of the charge storage circuit Co is shown in FIG. 27 and is constantly output as Vi / 2 as shown in (d).

28 shows a voltage drop circuit part and a voltage drop control part according to another embodiment.

Referring to FIG. 28, a voltage drop circuit part 610 and a voltage drop control part 620 are provided.

The voltage drop circuit unit 610 includes a first switch Q611 and a second switch Q612, a charge storage circuit Co, a first diode D611 and a second diode D612, a resonant circuit 611, A limiting circuit Z610, a first initial charge switch Q613, and a second initial charge switch Q614.

Comparing the resonant circuit 511 shown in Fig. 27 with the resonant circuit 611 shown in Fig. 28, the resonant inductor Lr included in the resonant circuit 611 shown in Fig. 28 and the resonant inductor Lr included in the resonant capacitor Cr The arrangement order is opposite to the arrangement order of the resonant inductor Lr and the resonant capacitor Cr included in the resonant circuit 511 shown in Fig. 27 is disposed on the first and second diodes D511 and D512 side while the resonance circuit 611 shown in Fig. 28 is disposed on the resonance capacitor Cr Are arranged on the side of the first and second switches Q611 and Q612.

At this time, the second initial charge switch Q614 may be provided between one side of the resonance capacitor Cr and the negative input terminal IN610b. Of course, the second initial charge switch Q614 may be provided between one side of the resonant inductor Lr and the negative input terminal IN610b.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the specific embodiments thereof except as defined in the appended claims. It should be understood that various modifications may be made by those skilled in the art, and these modified embodiments should not be understood individually from the technical idea of the disclosed invention.

10: power supply device 20: rectifying circuit part
30: Smoothing circuit part 110: Voltage drop circuit part
111: resonant circuit 120: voltage drop circuit part
Cr: resonant circuit capacitor Co: charge storage circuit
D111: first diode D112: second diode
Lr: resonant circuit inductor Q111: first switch
Q112: Second switch

Claims (24)

A rectifying circuit portion for rectifying the power supply;
A smoothing circuit for smoothing the voltage of the rectified power supply;
And a voltage drop circuit part for dropping the flattened voltage,
Wherein the voltage drop circuit part comprises:
A charge storage circuit for outputting the voltage dropped voltage;
A resonance circuit which receives a first current from the smoothing circuit and supplies a second current to the charge storage circuit;
And a current interrupting circuit for controlling the first current and the second current. The method according to claim 1,
Wherein the current interrupt circuit comprises:
A switching circuit for interrupting the first current and the second current;
And a rectifying circuit for rectifying the first current and the second current. 3. The method of claim 2,
Wherein the switching circuit comprises:
A first switch for interrupting the first current;
And a second switch for interrupting the second current. The method of claim 3,
And a voltage drop controller for controlling the first switch and the second switch. 5. The method of claim 4,
And the voltage drop control unit alternately opens and closes the first switch and the second switch. 6. The method of claim 5,
Wherein the voltage drop control unit opens and closes the first switch and the second switch at the same period as the resonance period of the resonance circuit. 3. The method of claim 2,
The rectifying circuit includes:
A first diode passing the first current and blocking the second current;
And a second diode for blocking said first current and for passing said second current. The method according to claim 1,
Wherein the current interrupt circuit comprises: a switching circuit connected in series with the charge storage circuit;
And a rectifier circuit connected in parallel with the charge storage circuit. 9. The method of claim 8,
Wherein the switching circuit includes a first switch and a second switch that are connected in series with each other. 10. The method of claim 9,
Wherein the rectifier circuit comprises a first diode and a second diode connected in series with each other. 11. The method of claim 10,
Wherein the resonant circuit is provided between a node where the first switch and the second switch are connected to each other and a node where the first diode and the second diode are connected to each other. 12. The method of claim 11,
Wherein the resonant circuit includes at least one capacitor and at least one inductor. 3. The method of claim 2,
Further comprising an initial charging circuit for initially charging the charge storage circuit. 14. The method of claim 13,
Wherein the initial charging circuit is provided in series between one end of the charge storage circuit and one end of the switching circuit. 15. The method of claim 14,
Wherein the initial charging circuit comprises:
A charge current limiting circuit for limiting an initial charge current to charge the charge storage circuit;
And a first initial charge switch for interrupting an initial charge current supplied to the charge storage circuit. 16. The method of claim 15,
Wherein the initial charging circuit further comprises a second initial charge switch for interrupting an initial charge current supplied to the resonant capacitor included in the resonant circuit. 1. A voltage drop circuit for dropping a voltage of a power supply,
A charge storage circuit for outputting the voltage dropped voltage;
A resonance circuit part receiving a first current from the power source and supplying a second current to the charge storage circuit;
A switching circuit part for interrupting the first current and the second current;
And the current interrupting circuit includes a rectifying circuit portion for rectifying the first current and the second current. 18. The method of claim 17,
Wherein the switching circuit comprises:
A first switch for interrupting the first current;
And a second switch for interrupting the second current. 19. The method of claim 18,
Further comprising: a voltage drop controller for controlling the first switch and the second switch. 20. The method of claim 19,
Wherein the voltage drop control unit alternately opens and closes the first switch and the second switch. 21. The method of claim 20,
Wherein the voltage drop control unit opens and closes the first switch and the second switch at the same period as the resonance period of the resonance circuit. 18. The method of claim 17,
The rectifying circuit section includes:
A first diode passing the first current and blocking the second current;
And a second diode for blocking said first current and passing said second current. 18. The method of claim 17,
Further comprising an initial charge circuit for initially charging the charge storage circuit. 24. The method of claim 23,
Wherein the initial charging circuit comprises:
A charge current limiting circuit for limiting an initial charge current to charge the charge storage circuit;
And a first initial charge switch for interrupting an initial charge current supplied to the charge storage circuit.

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