CN110461067B - Load driving circuit with power supply switch adjusting function, illumination driving system and driving method thereof - Google Patents
Load driving circuit with power supply switch adjusting function, illumination driving system and driving method thereof Download PDFInfo
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Abstract
The invention discloses a load driving circuit, a lighting driving system with a power switch dimming function and a driving method. The load driving circuit has a current feedback pin and at least one configuration pin, the load driving circuit comprising: a switch detection circuit for providing a power switch signal for detecting whether the switching action of the power switch meets a preset condition; and the reference setting circuit is selectively coupled with the configuration pins based on the power switch signal, and realizes multi-gear output current by detecting parameters on the coupled configuration pins to set a current reference. The invention can conveniently realize any adjustment of multi-gear output current and flexibly meet different requirements of users.
Description
Technical Field
The invention relates to the technical field of power electronics, in particular to a load driving circuit, a lighting driving system and a driving method.
Background
With the popularization of LED driving, the demand for light brightness adjustment is gradually derived, and the simplest method is to use a wall switch (hereinafter also referred to as a power switch). FIG. 1 is a schematic diagram of a prior art circuit for adjusting the brightness of a light through a wall switch; as shown in fig. 1, the basic principle of the power switch coupled between the AC power terminal and the rectifying circuit is that the LED driver judges the interval time between the front and rear of the wall switch and the on, and generally, the interval time less than 7s is considered to be the need of adjusting the output current, otherwise, the output current is considered to be unchanged when the normal switch is turned on next time. Compared with silicon controlled rectifier dimming and wireless intelligent dimming, the switch dimming has the advantages of no increase of system cost, good compatibility and no loss of efficiency.
The existing switching stepping dimming basic principle is that 3 output current references are set in a chip, and when the switching of a power switch is detected (the interval time is smaller than 7 s), the reference sequence of the 3 output currents is switched so as to meet the aim of regulating the output current.
Fig. 2 is a circuit diagram of a light brightness adjustment system in the prior art, fig. 3 is a circuit diagram of a light brightness adjustment control circuit in the prior art, and fig. 4 is a relation diagram of light brightness adjustment in the prior art. Referring to fig. 2 to 4, it is generally determined whether the switch is normally turned Off or dimmed, and is identified by the rule of the voltage VDD at the input end of the switch circuit, because the voltage VDD enters a low voltage lock (UVLO) due to insufficient Power supply after the switch is turned Off, and then the voltage VDD drops slowly due to the fact that the Power consumption current decreases to a very low value, if VDD reaches the on voltage again before the voltage VDD drops to the POR (Power Off Reset, system restart reference value), the internal output current reference is changed. Changing the current reference may be accomplished by changing the over-current reference (OCP) or the off-time reference (toff_min).
The existing switch stepping dimming has the problem that the proportion of output current is fixed, and the light efficiency is not flexible enough in design. For example, for different applications, different light intensities or light intensity ratios are required, and no adaptive design can be realized by the existing chip products. In addition, the current output of the dimming current of the prior proposal is regulated from large to small, can not be regulated from small to large, and can not meet different living habits and living demands of the masses.
In view of this, there is an urgent need to design a new light brightness adjustment control manner so as to overcome the above-mentioned drawbacks of the existing light brightness adjustment control manner.
Disclosure of Invention
In order to solve one or more of the above problems, the present invention provides a load driving circuit, a lighting driving system with a power switch dimming function and a driving method thereof.
According to one aspect of the present invention, a load driving circuit is coupled to a power switch, wherein the power switch is used for controlling connection and disconnection of the load driving circuit and a power source, the load driving circuit has at least one configuration pin for externally coupling a configuration component, and the load driving circuit comprises: the switch detection circuit is used for detecting the switching action of the power switch and providing a power switch signal which represents whether the switching action of the power switch accords with a preset condition; a reference setting circuit coupled to the switch detection circuit, the reference setting circuit selectively coupling the reference setting circuit to the configuration pin based on the power switch signal, and setting a current reference based on a parameter on the coupled configuration pin; and a turn-on control circuit for controlling the power transistor based on the current reference so that the output current has a multi-stage current value.
In one embodiment, when a parameter of the configuration component changes, the corresponding gear current value changes.
In one embodiment, the configuration component includes a configuration resistor, and the corresponding gear current value changes when the resistance value of the configuration resistor changes.
In one embodiment, the load driving circuit has at least two configuration pins, and when the positions of the configuration parts on the at least two configuration pins are changed accordingly, the output order of the corresponding gear current values is changed accordingly.
In one embodiment, the load driving circuit is provided with a current feedback pin which is used for externally coupling with the sampling resistor, and when the resistance value of the sampling resistor is changed, the current value of the multi-gear current is changed in the same proportion.
In one embodiment, the switch detection circuit, the reference setting circuit, and the on control circuit are disposed within the semiconductor wafer, and the sampling resistor and the configuration component are disposed outside the semiconductor wafer.
In one embodiment, the switch detection circuit is coupled to the sampling resistor for obtaining a current sampling signal and providing a power switch signal based on the current sampling signal.
In one embodiment, the magnitude relationship of the multi-stage current is adjusted by adjusting external parameters on each configuration pin.
In one embodiment, the switch detection circuit switches the configuration pin coupled to the reference setting circuit when the turn-off duration of the power switch corresponds to a preset period.
In one embodiment, the reference setting circuit comprises at least two selection switches, wherein each configuration pin is coupled to one selection switch, and the selection switches are switched on in a predetermined sequence when the switching action of the power switch meets a predetermined condition.
In one embodiment, the load driving circuit further includes an error amplifying circuit and a compensation capacitor, wherein a first input end of the error amplifying circuit is coupled to an output end of the reference setting circuit, a second input end of the error amplifying circuit is coupled to the sampling resistor, and an output end of the error amplifying circuit is coupled to the compensation capacitor and the conduction control circuit.
In one embodiment, the reference setting circuit includes: the switch selection circuit is coupled with the switch detection circuit and generates a plurality of switch selection signals based on the power switch signals; the control ends of the first selection switch, the second selection switch and the third selection switch are respectively controlled by a plurality of switch selection signals to sequentially switch on the selection switches according to a set sequence, and the first end of the first selection switch, the first end of the second selection switch and the first end of the third selection switch are used for providing a current reference; a reference voltage source coupled to the second end of the first selection switch; the first end of the third resistor is coupled with the reference voltage source, the second end of the third resistor is coupled with the second end of the second selection switch and is coupled with the first configuration resistor through the first configuration pin; and a fourth resistor having a first end coupled to the reference voltage source, a second end coupled to the second end of the third selection switch, and a second configuration resistor coupled to the second configuration pin.
In one embodiment, the reference setting circuit includes: the switch selection circuit is coupled with the switch detection circuit and generates a plurality of switch selection signals based on the power switch signals; the reference current source is coupled with the output end of the reference setting circuit; the control ends of the first selection switch, the second selection switch and the third selection switch are respectively controlled by a plurality of switch selection signals, and are used for switching on the selection switches in sequence according to a set sequence, the first end of the first selection switch, the first end of the second selection switch and the first end of the third selection switch are coupled with a reference current source, the second end of the first selection switch is coupled with a first configuration resistor through a first configuration pin, the second end of the second selection switch is coupled with a second configuration resistor through a second configuration pin, and the second end of the third selection switch is coupled with a built-in resistor or is coupled with a third configuration resistor through a third configuration pin.
In one embodiment, the on-control circuit includes: a frequency modulation circuit that generates a first adjustment signal based on a current reference; an amplitude modulation circuit that generates a second adjustment signal based on a current reference; the trigger circuit is provided with two input ends and an output end, and the two input ends respectively receive a first adjusting signal and a second adjusting signal; and the input end of the operational amplifier circuit is coupled with the output end of the trigger circuit, and the output end of the operational amplifier circuit is coupled with the control end of the power transistor.
According to another aspect of the present invention, a load driving circuit is coupled to a power switch, wherein the power switch is used for controlling connection and disconnection of the load driving circuit and a power supply, the load driving circuit has at least two configuration pins for being coupled to at least two configuration components respectively in one-to-one correspondence, when a switching action of the power switch meets a predetermined condition, the load driving circuit controls a current flowing through a power transistor to change, so as to realize that an output current has a multi-stage current value, wherein when parameters of the configuration components change, a corresponding stage current value changes, and when mutual positions of the at least two configuration components change, a sequence of corresponding stage currents correspondingly changes.
In one embodiment, the load driving circuit further has a current feedback pin for externally coupling to the sampling resistor, and the multi-stage current value is changed in proportion to the change of the resistance value of the sampling resistor.
In one embodiment, a load driving circuit includes: the switch detection circuit is used for outputting a power switch signal used for representing whether the switching action of the power switch accords with a preset condition; the reference setting circuit is coupled with the switch detection circuit and comprises a switch selection circuit and at least two selection switches, each configuration component is coupled with one selection switch through a configuration pin, and the switch selection circuit generates a plurality of switch selection signals based on a power switch signal for controlling the on-off of each selection switch and provides a current reference based on the on-off of the selection switch; and a conduction control circuit for controlling a current flowing through the power transistor according to the current reference.
According to still another aspect of the present invention, a lighting driving system with a power switching dimming function includes: the load driving circuit comprises a power transistor, and the rectifying circuit is coupled between the power switch and the load driving circuit.
In one embodiment, the load driving circuit further includes: the anode of the diode is coupled with the first end of the power transistor, and the cathode of the diode is coupled with the output end of the rectifying circuit and the anode of the LED lamp; the first end of the inductor is coupled with the first end of the power transistor, and the second end of the inductor is coupled with the cathode of the LED lamp.
According to still another aspect of the present invention, a load driving method for realizing a multi-stage output current includes: the power switch is coupled between the power supply and the driving circuit and used for controlling the connection and disconnection of the driving circuit and the power supply; the driving circuit is externally coupled with at least one configuration component; judging whether the switching action of the power switch meets a preset condition or not; selectively coupling the configuration component for changing the effective parameter when the switching action of the power switch meets a predetermined condition; the current reference is changed based on the change of the effective parameter so that the output current of the driving circuit is changed.
In one embodiment, the load driving method includes adjusting a current value of a corresponding gear current by adjusting a parameter of the configuration component.
In one embodiment, the load driving method further includes enabling the driving circuit to be externally coupled with the current sampling resistor, and adjusting the current value of the multi-gear current in the same proportion by adjusting the current sampling resistor.
In one embodiment, the load driving method includes providing a plurality of selection switches, and switching on the selection switches when the switching action of the power switch meets a predetermined condition, for selectively switching the coupling configuration pins.
The load driving circuit, the lighting driving system with the power switch dimming function and the driving method realize multi-gear output current, and the multi-gear current is flexibly adjustable through the arrangement of the external configuration component, so that the load driving circuit can be suitable for different occasions, and the brightness adjusting sequence can be suitable for different use habits.
Drawings
Fig. 1 is a schematic diagram of a prior art circuit for adjusting the brightness of a lamp through a wall switch.
Fig. 2 is a circuit diagram of a lamp brightness adjusting system in the prior art.
Fig. 3 is a circuit diagram of a light brightness adjustment control circuit in the prior art.
FIG. 4 is a diagram showing the relationship among OCP, toff_min, switch and VDD in the conventional lamp brightness adjustment.
Fig. 5 is a schematic diagram of a system architecture of a load driving system according to an embodiment of the invention.
Fig. 6 is a schematic diagram of a system architecture of a load driving system according to another embodiment of the invention.
Fig. 7 is a schematic circuit diagram of a load driving system according to an embodiment of the invention.
FIG. 8 is a circuit diagram of a reference setting circuit according to an embodiment of the invention.
FIG. 9 is a circuit diagram of a reference setting circuit according to an embodiment of the invention.
Fig. 10 is a flowchart of a detection step for detecting whether the switching operation of the power switch meets a predetermined condition in an embodiment of the invention.
Fig. 11 is a schematic diagram illustrating an adjusting effect of a load driving system according to an embodiment of the invention.
Fig. 12 shows a flow chart of a load driving method for realizing a multi-stage output current according to an embodiment of the present invention.
Detailed Description
Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
For a further understanding of the present invention, preferred embodiments of the invention are described below in conjunction with the examples, but it should be understood that these descriptions are merely intended to illustrate further features and advantages of the invention, and are not limiting of the claims of the invention.
The description of this section is intended to be illustrative of only a few exemplary embodiments and the invention is not to be limited in scope by the description of the embodiments. It is also within the scope of the description and claims of the invention to interchange some of the technical features of the prior art and embodiments that are the same or similar.
In the specification, "plurality" means two or more; "Multi-speed" means two or more speeds. "coupled" or "connected" in the specification includes both direct and indirect connections, such as through some active, passive, or electrically conductive medium; connections through other active or passive devices, such as through switches, follower circuits, etc. circuits or components, may be included as known to those skilled in the art, on the basis of achieving the same or similar functional objectives.
Fig. 5 shows a schematic diagram of a load driving system according to an embodiment of the invention. The load driving system includes a load driving circuit for driving the load 53 and a load 53. In the illustrated embodiment, the load drive circuit includes a drive control circuit 54, a diode Di, and an inductance L. The load driving circuit may also include only the driving control circuit 64 shown in fig. 6. The load driving circuit is coupled to the power switch PS through the rectifying circuit 52. Wherein the power switch PS is used for controlling connection and disconnection of the load driving circuit and the power supply. In one embodiment, the power switch PS is a wall switch disposed on a wall, and is convenient to operate, and is used for controlling the connection or disconnection of the load driving circuit and the commercial ac power supply, so that the wall switch does not increase the system cost, has good compatibility, and does not lose efficiency. the load driving circuit may detect the switching action of the power switch PS and further determine whether the switching action of the power switch PS meets a predetermined condition. The load driving circuit has at least one configuration pin (CS 2 and CS 3), each for externally coupling a corresponding configuration component (R1 and R2). In one embodiment, the configuration component is a resistor, or configuration resistor. The load driving circuit can selectively couple the internal reference setting circuit with one or more configuration pins by detecting whether the switching action of the power switch PS meets a predetermined condition, and control the current flowing through the power transistor K by detecting the parameter setting current reference on the coupled configuration pins, thereby realizing the control of the multi-stage output current. In one embodiment, the load driving circuit switches the coupling configuration pins according to a preset sequence for realizing current shifting whenever detecting that the turn-off duration of the power switch PS meets a preset range. In one embodiment, there is and only one configuration pin for each current gear coupled to the internal reference setting circuit. In another embodiment, no configuration pins are coupled to the internal reference setting circuit in one of the current steps, and only one configuration pin is coupled to the internal reference setting circuit in each of the remaining current steps (see fig. 8). In the embodiment shown in fig. 5, the load driving circuit is provided with two configuration pins, which are coupled to a resistor (R1, R2) respectively. In other embodiments, the load driving circuit may have one configuration pin (capable of realizing two-stage output current) or more than two configuration pins, and the configuration pins may also be coupled with a capacitor, a current source, or the like, and the current reference of the system is set by detecting the capacitance value or the current value, so as to control the current flowing through the power transistor K to change and further realize multiple-stage output current. The corresponding current reference can be adjusted by adjusting the parameters of the configuration component, so that when the parameters (e.g., resistance) of the configuration component (R1 or R2) are changed, the corresponding gear current changes the current value. In one embodiment, the load driving circuit has at least two configuration pins for coupling to the at least two configuration components respectively in one-to-one correspondence, and as parameters of the configuration components determine corresponding current references, when the mutual positions of the at least two configuration components are changed, the sequence of corresponding current changes accordingly, for example, when the two configuration pins are respectively coupled with the resistors R1 and R2, when the power switch sequentially performs a switching operation meeting a predetermined condition, the output current outputs three current values I1, I2 and I3 respectively, wherein the resistance value of R1 determines the current value I1 and the resistance value of R2 determines the current value I2. when the resistors R1 and R2 exchange configuration pins, the output currents output three-speed current values I2, I1, and I3, respectively, when the power switch sequentially performs switching actions conforming to predetermined conditions. Specific driving methods and examples are described below. The load driving circuit further has a current feedback pin (CS 1) for externally coupling to the sampling resistor Rcs. The current reference of all gears can be adjusted by adjusting the sampling resistor. When the resistance value of the sampling resistor Rcs is changed, the current values of the multi-stage currents are changed in the same proportion.
In the embodiment shown in fig. 5, the load 53 comprises an LED lamp, and the load driving system shown is a lighting driving system with a mains switch dimming function.
In the embodiment shown in fig. 5, the load driving circuit may further include a rectifying circuit 52, a diode Di, and an inductance L in addition to the driving control circuit 54. Wherein the anode of diode Di is coupled to the first terminal of power transistor K and the cathode is coupled to the output of rectifying circuit 52 and the anode of the LED lamp. The first end of the inductor L is coupled to the first end of the power transistor K, and the second end is coupled to the cathode of the LED lamp. The driving control circuit 54 may be a semiconductor chip or an electronic package. The drive control circuit 54 may include a power transistor K. In the circuit shown in fig. 5, the load driving circuit includes a Buck (Buck) switching circuit, and the power transistor K is operated in a switching state and is a power switch. In further embodiments, the load driving circuit may be a Buck-Boost (Buck-Boost) switching circuit or a Boost (Boost) switching circuit.
Fig. 6 shows a schematic diagram of a load driving system according to another embodiment of the invention. The load driving system includes a linear driving circuit. The power transistor K in the load driving system is directly coupled to the load 53, wherein the power transistor K is a linear device operable in a resistance variable region.
The load driving system of the embodiment shown in fig. 5 and 6 further includes a rectifying circuit 52 coupled between the switching power supply Q and the load driving circuit for rectifying the ac mains power into a bus voltage of a steamed bread waveform, and filtering the input capacitor to form a dc signal.
In one embodiment, the drive control circuit 54 or 64 shown in fig. 5 or 6 is provided on a semiconductor wafer, and the drive control circuit 54 or 64 includes the switch detection circuit 31, the reference setting circuit 32, and the conduction control circuit 34 shown in fig. 7. The semiconductor wafer may be further provided with a power transistor K and an error amplifying circuit 33 as shown in fig. 7.
Fig. 7 shows a schematic diagram of a load driving system according to an embodiment of the invention. Wherein the load driving circuit 3 has a current feedback pin CS and two configuration pins C and D for coupling to an external and sampling resistor Rcs and configuration resistors R1 and R2, respectively. The corresponding gear current value is adjusted by configuring the resistance value of the resistor R1 or R2. Of course, the load driving circuit 3 may have at least only one configuration pin for realizing the two-stage output current. The load driving circuit 3 includes a switch detecting circuit 31, a reference setting circuit 32, an error amplifying circuit 33, and a conduction control circuit 34. In one embodiment, error amplification circuitry 33 may not be employed. The switch detection circuit 31 is configured to detect a switching operation of the power switch PS and provide a power switch signal a indicating whether the switching operation of the power switch PS meets a predetermined condition, for example, when it is determined that the switching operation of the power switch PS meets the predetermined condition, the power switch signal a is in an active state, such as a high level pulse. In one embodiment, when the turn-off duration of the power switch PS meets the preset period, if the turn-off time is greater than the first time threshold and less than the second time threshold, the power switch signal a in an active state is output for switching the configuration pins coupled to the reference setting circuit. For example, fig. 10 is a flowchart of a detection step for detecting whether the switching operation of the power switch meets a predetermined condition according to an embodiment of the present invention: if the voltage of the current sampling signal Vcs is less than 100mv for 10ms to 7s, the power switch signal a is switched from the inactive value to the active value, and the switch selection circuits in the reference setting circuit sequentially switch the switch selection signals O, P, Q to the active state in order to sequentially turn on the corresponding selection switches. And switching once every time the power switch is detected to meet the switching action of the preset condition. Of course, the switching action of the power switch meeting the predetermined condition may be other forms, such as two off-on actions.
The reference setting circuit 32 is coupled to the switch detection circuit 31, the reference setting circuit 31 selectively couples the reference setting circuit 32 to the configuration pin (C or D) based on the power switch signal a, and sets the current reference B based at least on a parameter on the coupled configuration pin. In the illustrated embodiment, the current reference B is set by detecting a resistance value on a configuration pin. In one embodiment, the reference setting circuit includes at least two selection switches, wherein each configuration pin is coupled to one selection switch, and when the switching action of the power switch PS meets a predetermined condition, the selection switch is switched on, and the configuration pins are switched, so that the parameter is changed, the current reference is correspondingly changed, and the current shift is realized. The number of the selection switches may be equal to or greater than the number of the configuration pins. In one embodiment, the number of selection switches is greater than the number of configuration pins, and the load drive circuit sets the multi-stage current based on parameters on the configuration pins and internal parameters.
Fig. 8 shows a circuit schematic of a reference setting circuit according to an embodiment of the invention. The reference setting circuit comprises a plurality of selection switches, the selection switches are sequentially conducted based on the state of the switching power supply signal A, and the selection switches are used for changing parameters connected into the reference setting circuit to realize current gear shifting. The reference setting circuit includes a switch selection circuit 321, a first selection switch K1, a second selection switch K2, a third selection switch K3, a reference voltage source V1, and resistors R3 and R4. The reference setting circuit is coupled to the external and configuration resistors R1 and R2 through configuration pins C and D, respectively. The switch selection circuit 321 is coupled to the switch detection circuit 31 for receiving the power switch signal a. The switch selection circuit 321 generates a plurality of switch selection signals O, P and Q based on the power switch signal a. In one embodiment, the switch select signals O, P and Q are sequentially asserted according to the power switch signal a for turning on the corresponding select switches. When the power switch signal a shows an active state every time, the switch selection signals in the active state are switched once according to a preset sequence, for example, the switch selection signals O, P and the Q state are switched from 100 to 010 to 001, wherein 0 represents that the corresponding selection switch is turned off, and 1 represents that the corresponding selection switch is turned on. The control ends of the first selection switch K1, the second selection switch K2 and the third selection switch K3 are respectively controlled by switch selection signals O, P and Q, so that the selection switches are sequentially switched on according to a set sequence. When the switch select signals O, P and Q are switched from 100 to 010, then to 001 means that the first select switch K1 is turned on to the second select switch K2 is turned on, then to the third select switch K3 is turned on. The first terminal of the first selection switch K1, the first terminal of the second selection switch K2 and the first terminal of the third selection switch K3 are coupled to the output terminal of the reference setting circuit 32 for providing the current reference B. The second terminal of the first selection switch K1 is coupled to the reference voltage source V1. The second end of the second selection switch K2 is coupled to the resistor R3 and coupled to the first configuration resistor R1 through the first configuration pin C, wherein the other end of the third resistor R3 is coupled to the reference voltage source V1. The second end of the third selection switch K3 is coupled to the fourth resistor R4 and coupled to the second configuration resistor R2 through the second configuration pin D, wherein the other end of the fourth resistor R4 is coupled to the reference voltage source V1. When the switch selection signals O, P and Q are switched from 100 to 010 and then to 001, the voltage source is coupled to the B terminal, the C terminal is coupled to the B terminal, and then to the D terminal, and the reference current signals B are respectively switched from V1 to R1/(r1+r3) ×v1, and then to R2/(r2+r4) ×v1, which are respectively proportional to the current values of the third-gear output currents. The current value of the second-gear current can be adjusted by adjusting the resistance value of the configuration resistor R1, and the current value of the third-gear current can be adjusted by adjusting the resistance value of the configuration resistor R2. With the reference setting circuit shown in fig. 8, when the resistances of the configuration resistors R1 and R2 are the same, only two-stage current output can be achieved. If R1/(r1+r3) > R2/(r2+r4), the current intensity is high, medium, and weak when the selection switches K1, K2, and K3 are sequentially switched. If R1/(r1+r3) < r2/(r2+r4), the current intensity is high, weak, medium when the selection switches K1, K2, and K3 are sequentially switched.
Fig. 9 shows a circuit schematic of a reference setting circuit according to another embodiment of the invention. The reference setting circuit includes a switch selection circuit 321, a first selection switch K1, a second selection switch K2, a third selection switch K3, a reference current source I1, a reference voltage source V1, and a calculation unit 322. The switch selection circuit 321 is coupled to the switch detection circuit 31, and the switch selection circuit 321 generates a plurality of switch selection signals O, P, Q based on the power switch signal a. When the power switch signal a shows an active state once, the active values in the switch selection signal O, P, Q are sequentially switched once, for example, the power switch signal a sequentially shows three active states (three high-level pulses appear), the switch selection signals O, P and Q states can be respectively switched from 100 to 010, from 010 to 001 to 100, and from 001 to 100, so that the reference setting circuit is respectively coupled to the configuration pin C, to the configuration pin D, to the end E, and to the end C, and the current source I1 charges the resistors R5, R6, R7, and R5 to generate corresponding voltage signals for further generating the current reference B. . The E end may be a configuration pin for coupling to the external configuration resistor R7, or may not be a configuration pin for coupling to the internal resistor R7. The calculating unit 322 has a first input terminal, a second input terminal and an output terminal, wherein the first input terminal of the calculating unit 322 is coupled to the reference voltage source V1, the second input terminal of the calculating unit 322 is coupled to the reference current source I1, and the output terminal of the calculating unit 322 is used for providing the current reference B. The control ends of the first selection switch K1, the second selection switch K2 and the third selection switch K3 are respectively controlled by a switch selection signal O, P, Q, so as to switch on the selection switches in turn according to a set sequence. The first end of the first selection switch K1, the first end of the second selection switch K2 and the first end of the third selection switch K3 are coupled to the reference current source I1, and the second end of the first selection switch K1, the second end of the second selection switch K2 and the second end of the third selection switch K3 are respectively coupled to the three configuration resistors R5, R6 and R7 through the three configuration pins C, D, E. When the switch select signals O, P and Q states can be switched from 100 to 010 to 001, respectively, the current references are set to K0R 5, K0R 6, and K0R 7, respectively, where K0 is a constant associated with the current source I1 and the voltage source V1. The first gear current value can be adjusted by adjusting the resistance value of R5, the second gear current value can be adjusted by adjusting the resistance value of R6, and the third gear current value can be adjusted by adjusting the resistance value of R7. By adjusting the resistance values of R5, R6 and R7, the magnitude relation of the three-gear current values can be arbitrarily adjusted, and current references such as strong-medium-weak, weak-medium-strong, medium-strong-weak and the like in any sequence can be realized during sequential switching. Therefore, the embodiment is not limited by the switching of the fixed current reference which can only be switched from large to small in the prior art, and the switching of the current reference from small to large can be realized through the configuration of the external resistor. Even when the resistances of the configuration resistors R5 and R6 are set to be the same, the system can realize two-stage current output. When the resistances of the configuration resistors R5, R6, and R7 are set to be the same, the system can realize a first-gear current output. In addition, the current value of each current can be regulated in the same proportion by regulating the resistance value of the sampling resistor.
When the load driving circuit has at least two configuration pins, the output sequence of the corresponding gear current is correspondingly changed when the mutual positions of a plurality of configuration components are correspondingly exchanged, for example, when the configuration pin C is coupled with R5, the pin D is coupled with R6, and the pin E is coupled with R7, when the power switch sequentially executes the switching action meeting the preset condition, the output current sequentially outputs three-gear current values I1, I2 and I3 and continues to circulate, and when the configuration pin C is coupled with R7, the pin D is coupled with R5, and the pin E is coupled with R6, when the power switch sequentially executes the switching action meeting the preset condition, the output current sequentially outputs three-gear current values I3, I1 and I2 and continues to circulate.
In another embodiment, the load driving circuit including the reference setting circuit as shown in fig. 9 has two configuration pins C and D for realizing three-stage current adjustment, where R7 is an on-chip resistor, R5 and R6 are off-chip external resistors, and the magnitude relationship of each stage current can also be adjusted by adjusting R5 and R6. When the positions of R5 and R6 are exchanged, the order of the corresponding shift currents is also changed accordingly, for example, when the original configuration pin C is coupled to R5 and pin D is coupled to R6, when the power switch sequentially performs switching actions conforming to predetermined conditions, the output currents sequentially present three-shift current values I1, I2, and I3, and when the configuration pin C is coupled to R6 and pin D is coupled to R5, when the power switch sequentially performs switching actions conforming to predetermined conditions, the output currents sequentially present three-shift current values I2, I1, and I3 as follows.
In another embodiment of the present invention, the reference setting circuit may not include the reference voltage source V1 and the calculation unit, and the current reference may be directly provided by the coupling terminal of the current source I1 and the selection switch.
The embodiments shown in fig. 8 and 9 achieve three-speed output current and regulation. In other embodiments, two output currents and adjustments may be achieved by providing a configuration pin and two selection switches to the reference setting circuit shown in fig. 8 or 9. By setting three or more configuration pins to the reference setting circuit shown in fig. 8, more stages of output current and regulation functions can be realized. By providing the reference setting circuit shown in fig. 9 with two configuration pins and two selection switches, two-stage output current and regulation can be achieved. By setting four or more configuration pins to the reference setting circuit shown in fig. 9, more stages of output current and regulation functions and the like can be realized.
Continuing with the description of fig. 7, the error amplifying circuit 33 includes an error amplifying circuit 331 and a compensation capacitor Comp, wherein a first input terminal of the error amplifying circuit 331 is coupled to the output terminal of the reference setting circuit 32, a second input terminal of the error amplifying circuit 331 is coupled to the sampling resistor Rcs for receiving a current sampling signal representing the output current, and an output terminal of the error amplifying circuit 331 is coupled to the compensation capacitor Comp and the on control circuit 34. The error amplifying circuit 33 error-amplifies the difference between the current sampling signal and the current reference B so that the average value of the output current follows the current reference B. By adjusting the resistance value of the sampling resistor Rcs, the current value of each gear can be adjusted in the same proportion. When the reference setting circuit shown in fig. 8 is employed, the sampling resistor Rcs determines the maximum output current in the multi-stage current. When the reference setting circuit shown in fig. 9 is employed, the basic output current can be adjusted by adjusting the sampling resistor Rcs.
In another embodiment, the load driving system does not include an error amplifying circuit, and the on-control circuit 34 performs open loop control of the current directly based on the current reference B.
As can be seen from the description of the above embodiment, the setting of the current level of any magnitude relation can be conveniently realized by setting the external resistor including the sampling resistor Rcs and the plurality of configuration resistors R5, R6 and R7, and various design requirements can be flexibly satisfied.
The turn-on control circuit 34 controls the power transistor K based on the current reference B. In the embodiment shown in fig. 7, the on control circuit 34 includes a frequency modulation circuit (FM) 341, an amplitude modulation circuit (AM) 342, a trigger circuit 343, and an operational amplification circuit 344. Wherein the frequency modulation circuit 341 generates the first adjustment signal based on the current reference B. The frequency modulation circuit 341 may be any circuit capable of adjusting the frequency of the power transistor K. In the illustrated embodiment, the frequency modulation circuit 341 generates the first adjustment signal based on the error amplified signal of the current reference B and the current sampling signal and the zero current detection signal ZCD of the inductor L, and may reduce the system frequency when the current reference B increases. When the ZCD signal is an effective value, the frequency modulation circuit 341 outputs the effective value to set the trigger circuit 343, and turns on the power transistor K. The amplitude modulation circuit 342 generates a second adjustment signal based on the current reference B. In one embodiment, when the sawtooth signal rises to the reference signal or the error amplification signal of the error amplification circuit, the amplitude modulation circuit 342 outputs an effective value for resetting the trigger circuit, turning off the power transistor K. The trigger circuit 343 has two inputs coupled to the frequency modulation circuit 341 and the amplitude modulation circuit 342 for receiving the first adjustment signal and the second adjustment signal, respectively, and an output coupled to the operational amplifier circuit 344. The illustrated flip-flop circuit 343 is an RS flip-flop circuit, and when the set (S) signal is active, the flip-flop circuit 343 is set to output a high level signal, and when the reset (R) signal is active, the flip-flop circuit 343 is reset to output a low level signal. The output terminal of the operational amplifier 344 is coupled to the control terminal of the power transistor K. The operational amplifier circuit 344 amplifies the output signal of the trigger circuit 343 for driving the power transistor K. Since the current reference can be switched in multiple stages, the output current flowing through the power transistor K follows the current reference, and thus the system realizes a multiple stage output current.
The on-control circuit may have any other suitable configuration and be controlled in any suitable control manner such that the output current follows the current reference.
In one embodiment, the switch detection circuit 31, the reference setting circuit 32, and the on control circuit 34 are disposed inside the semiconductor wafer, and the sampling resistor Rcs and the configuration components such as the configuration resistors R1, R2 (or R5, R6) are disposed outside the semiconductor wafer.
In addition to configuring the resistor via the configuration pins, the current reference may also be adjusted by configuring the capacitor or current via the configuration pins, by configuring parameters of a configuration component coupled to the reference setting circuit.
From the above embodiments, it can be seen that the magnitude relation of the multi-stage current can be adjusted by adjusting the external parameters on each configuration pin. In this way, each lighting manufacturer can conveniently set the proportion of the output current freely by selecting the first resistor R1 and the second resistor R2 (or the fifth resistor R5 and the sixth resistor R6) instead of being fixedly set by the control chip. For example, the brightness may be set to 60%,80% and 100%, respectively, for brightness adjustment in a working environment, or 10%,70% and 100%, respectively, for use as different functions of night light, reading and working, respectively. The designer can easily realize the expansion of various different functions of the lighting device only through the selection setting of the external resistor.
FIG. 11 shows the magnitude adjustment relationship of the multi-stage current according to an embodiment of the present invention. By adjusting the parameters of the configuration components, such as setting the resistance values of the resistors R5, R6 and R7 as shown in the embodiment of fig. 9 to be the current reference of R5< R6< R7, the three-gear current can be adjusted from small to large, the brightness becomes bright gradually, and the three-gear current can be adjusted from large to small by setting the resistance values of the resistors R5, R6 and R7 to be the positions of R5> R6> R7, or the positions of the corresponding switching elements R5 and R7.
In one embodiment, the switch detection circuit 31 is coupled to the sampling resistor Rcs for obtaining a current sampling signal and providing a power switch signal a based on the current sampling signal.
Fig. 10 shows a flowchart for providing a power switch signal a for detecting whether a power switch in a load driving circuit meets a predetermined condition according to an embodiment of the present invention. The detection step comprises the following steps: when the power switch PS is turned off for shutdown, the current sampling signal Vcs falls. The current sampling signal Vcs is detected, and when a state in which Vcs is smaller than a predetermined value such as 100mv exceeds a first set time such as 10ms, timing is started, indicating that the power switch has an off-state, the state is timed. If the interval from off to on of the power switch PS exceeds a second set time, e.g., 7 seconds, the system current reference is reset to an initial value. If the interval from off to on is longer than the first set time (e.g. 10 ms) but shorter than the second set time (e.g. 7 s), the system determines that the current reference needs to be changed, that is, the switching action of the power switch PS meets the predetermined condition, and the switch detection circuit outputs an effective power switch signal a, such as a high level pulse, for switching on the selection switch to change the current reference.
In other embodiments, the switch detection circuit 31 may also detect the operation of the power switch PS by detecting other types or other location parameters. The switching action is measured, for example, by detecting the voltage at the output of the rectifying circuit, and is further used to determine whether the switching action of the power switch PS meets a predetermined condition.
Fig. 12 shows a flow chart of a load driving method for realizing a multi-stage output current according to an embodiment of the present invention. The driving method includes steps 1201-1205 as shown. At step 1201: the power switch PS is coupled between the power source and the driving circuit, and is used for controlling connection and disconnection of the driving circuit and the power source. Preferably, the power source is a mains ac power source and the power switch PS is a wall switch. In step 1202, at least one configuration component is externally connected to a driving circuit. Preferably, the configuration component is a resistor. The configuration component may also be other types of elements, such as a capacitor. In step 1203, it is determined whether the switching operation of the power switch PS meets a predetermined condition. In one embodiment, determining whether the switching action of the power switch PS meets the predetermined condition includes determining whether the turn-off duration of the power switch PS meets a preset interval by detecting a current sampling signal of the output current, e.g., determining that the switching action of the power switch PS meets the predetermined condition when the turn-off duration of the power switch is longer than the first time duration and shorter than the second time duration. In step 1204, a configuration component is selectively coupled for changing the effective parameter when the switching action of the power switch meets a predetermined condition. In one embodiment, selectively coupling the configuration components includes switching the coupling configuration components, i.e., from coupling one configuration component to coupling another configuration component, for changing the effective parameter when the switching action of the power switch PS meets a predetermined condition. In one embodiment, selectively coupling the configuration component includes selectively switching the coupling configuration pin by providing a plurality of selection switches that are switched on when a switching action of the power switch meets a predetermined condition. In one embodiment, the effective parameter is an effective resistance, which refers to the combined resistance formed by all resistors coupled to the coupled configuration pin, as shown in FIG. 8, when configuration pin C is selected, the effective resistance is R1/(R1+R3). The effective resistance value can be changed by selecting resistors with different resistance values (a resistor or a group of resistors, wherein a plurality of resistors are arranged in the group of resistors) to be coupled with corresponding configuration pins. In step 1205, the current reference is changed based on the change in the effective parameter such that the output current of the drive circuit is changed. In one embodiment, the current value of the corresponding gear current may be adjusted by adjusting a parameter of the configuration component. The method can further comprise the step of externally connecting a current sampling resistor to the driving circuit, and the current value of the multi-gear current can be adjusted in the same proportion by adjusting the current sampling resistor. The embodiment can realize the adjustment of the current reference from large to small by adjusting the parameters of the external configuration component, can also realize the adjustment from small to large, and can even realize the adjustment of multi-gear output current with arbitrary size and sequence, thereby being convenient for meeting various demands of masses.
As can be seen from the above description, the load driving circuit, the lighting driving system with the power switch dimming function and the driving method provided in the embodiments of the present invention can realize multi-stage arbitrary adjustment of output current by selecting external configuration components. The switching effect from weak to strong or from strong to weak can be realized for the multi-gear output current, and the two-gear or one-gear output can be realized on the three-gear current load driving circuit.
The description and applications of the present invention herein are illustrative and are not intended to limit the scope of the invention to the embodiments described above. Variations and modifications of the embodiments disclosed herein are possible, and alternatives and equivalents of the various components of the embodiments are known to those of ordinary skill in the art. It will be clear to those skilled in the art that the present invention may be embodied in other forms, structures, arrangements, proportions, and with other assemblies, materials, and components, without departing from the spirit or essential characteristics thereof. Other variations and modifications of the embodiments disclosed herein may be made without departing from the scope and spirit of the invention.
Claims (18)
1. A load driving circuit coupled to a power switch, wherein the power switch is configured to control connection and disconnection of the load driving circuit to and from a power source, the load driving circuit having at least one configuration pin configured to couple to a configuration component, the load driving circuit comprising:
the switch detection circuit is used for detecting the switching action of the power switch and providing a power switch signal which represents whether the switching action of the power switch accords with a preset condition;
a reference setting circuit coupled to the switch detection circuit, the reference setting circuit selectively coupling the reference setting circuit to the configuration pin based on the power switch signal, and setting a current reference based on a parameter on the coupled configuration pin; and
A turn-on control circuit for controlling the power transistor based on the current reference so that the output current has a multi-stage current value;
The load driving circuit is further provided with a current feedback pin, the current feedback pin is externally coupled with the sampling resistor, and when the resistance value of the sampling resistor is changed, the multi-gear current value is changed in the same proportion.
2. The load driving circuit according to claim 1, wherein when the parameter of the configuration member is changed, the corresponding gear current value is changed.
3. The load driving circuit according to claim 1, wherein the switch detecting circuit, the reference setting circuit, and the on control circuit are provided inside a semiconductor wafer, and the sampling resistor and the configuration member are provided outside the semiconductor wafer.
4. The load driving circuit of claim 1, wherein the switch detection circuit is coupled to the sampling resistor for obtaining a current sampling signal and providing the power switch signal based on the current sampling signal.
5. The load driving circuit according to claim 1, wherein the switch detecting circuit switches the configuration pin coupled to the reference setting circuit when an off-period of the power switch corresponds to a preset period.
6. The load driving circuit of claim 1, wherein the reference setting circuit comprises at least two selection switches, wherein each configuration pin is coupled to one selection switch, and the selection switches are switched on in a preset order when the switching action of the power switch meets a preset condition.
7. The load driving circuit of claim 1, further comprising an error amplifying circuit and a compensation capacitor, wherein a first input terminal of the error amplifying circuit is coupled to the output terminal of the reference setting circuit, a second input terminal of the error amplifying circuit is coupled to the sampling resistor, and an output terminal of the error amplifying circuit is coupled to the compensation capacitor and the on control circuit.
8. The load driving circuit according to claim 1, wherein the reference setting circuit includes:
the switch selection circuit is coupled with the switch detection circuit and generates a plurality of switch selection signals based on the power switch signals;
the control ends of the first selection switch, the second selection switch and the third selection switch are respectively controlled by a plurality of switch selection signals to sequentially switch on the selection switches according to a set sequence, and the first end of the first selection switch, the first end of the second selection switch and the first end of the third selection switch are used for providing a current reference;
A reference voltage source coupled to the second end of the first selection switch;
The first end of the third resistor is coupled with the reference voltage source, the second end of the third resistor is coupled with the second end of the second selection switch and is coupled with the first configuration resistor through the first configuration pin; and
And the first end of the fourth resistor is coupled with the reference voltage source, the second end of the fourth resistor is coupled with the second end of the third selection switch and is coupled with the second configuration resistor through the second configuration pin.
9. The load driving circuit according to claim 1, wherein the reference setting circuit includes:
the switch selection circuit is coupled with the switch detection circuit and generates a plurality of switch selection signals based on the power switch signals;
The reference current source is coupled with the output end of the reference setting circuit; and
The control ends of the first selection switch, the second selection switch and the third selection switch are respectively controlled by a plurality of switch selection signals and are used for switching on each selection switch in turn according to a set sequence, the first end of the first selection switch, the first end of the second selection switch and the first end of the third selection switch are coupled with a reference current source, the second end of the first selection switch is coupled with a first configuration resistor through a first configuration pin, the second end of the second selection switch is coupled with a second configuration resistor through a second configuration pin, and the third selection switch is used for switching on each selection switch in turn according to the set sequence, and the second end of the third selection switch is coupled with a built-in resistor or is coupled with a third configuration resistor through a third configuration pin.
10. The load driving circuit according to claim 1, wherein the conduction control circuit includes:
A frequency modulation circuit that generates a first adjustment signal based on a current reference;
An amplitude modulation circuit that generates a second adjustment signal based on a current reference;
the trigger circuit is provided with two input ends and an output end, and the two input ends respectively receive a first adjusting signal and a second adjusting signal; and
The input end of the operational amplifier circuit is coupled with the output end of the trigger circuit, and the output end of the operational amplifier circuit is coupled with the control end of the power transistor.
11. A load driving circuit is coupled with a power switch, wherein the power switch is used for controlling the connection and disconnection of the load driving circuit and a power supply, the load driving circuit is provided with at least two configuration pins for being coupled with at least two configuration components in a one-to-one correspondence mode, when the switching action of the power switch meets preset conditions, the load driving circuit controls the current flowing through a power transistor to change, so that the output current has a multi-stage current value, when the parameters of the configuration components change, the corresponding stage current value changes, and when the mutual positions of the at least two configuration components change, the sequence of the corresponding stage currents correspondingly changes.
12. The load driving circuit according to claim 11, comprising:
The switch detection circuit is used for outputting a power switch signal used for representing whether the switching action of the power switch accords with a preset condition;
The reference setting circuit is coupled with the switch detection circuit and comprises a switch selection circuit and at least two selection switches, each configuration component is coupled with one selection switch through a configuration pin, and the switch selection circuit generates a plurality of switch selection signals based on a power switch signal for controlling the on-off of each selection switch and provides a current reference based on the on-off of the selection switch; and
And the conduction control circuit is used for controlling the current flowing through the power transistor according to the current reference.
13. A lighting drive system with a mains switch dimming function, the lighting drive system comprising: a rectifying circuit, a load driving circuit according to any one of claims 1 to 12, and an LED lamp, wherein the load driving circuit comprises a power transistor, the rectifying circuit being coupled between the power switch and the load driving circuit.
14. The lighting drive system of claim 13, wherein the load drive circuit further comprises:
the anode of the diode is coupled with the first end of the power transistor, and the cathode of the diode is coupled with the output end of the rectifying circuit and the anode of the LED lamp;
The first end of the inductor is coupled with the first end of the power transistor, and the second end of the inductor is coupled with the cathode of the LED lamp.
15. A load driving method for realizing a multi-stage output current, comprising:
The power switch is coupled between the power supply and the driving circuit and used for controlling the connection and disconnection of the driving circuit and the power supply;
The driving circuit is externally coupled with at least one configuration component;
Judging whether the switching action of the power switch meets a preset condition or not;
selectively coupling the configuration component for changing the effective parameter when the switching action of the power switch meets a predetermined condition;
the current reference is changed based on the change of the effective parameter so that the output current of the driving circuit is changed.
16. The load driving method according to claim 15, comprising adjusting a current value of the corresponding gear current by adjusting a parameter of the configuration member.
17. The load driving method of claim 15, further comprising coupling the driving circuit to the current sampling resistor, and adjusting the current value of the multi-stage current in the same proportion by adjusting the current sampling resistor.
18. The load driving method according to claim 15, comprising providing a plurality of selection switches for switching on the selection switches for selectively switching the coupling configuration pins when a switching action of the power switch meets a predetermined condition.
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| CN115190670A (en) * | 2021-04-01 | 2022-10-14 | 华润微集成电路(无锡)有限公司 | Linear LED drive circuit, power switch detection method and dimming control method |
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| CN104125692A (en) * | 2014-08-11 | 2014-10-29 | 矽力杰半导体技术(杭州)有限公司 | Multiway LED constant current controller and control method |
| CN204887539U (en) * | 2015-06-25 | 2015-12-16 | 嘉兴赛亮电子科技有限公司 | Divide with band switch and keep off LED light modulator who adjusts |
| CN108124347A (en) * | 2017-11-01 | 2018-06-05 | 杭州古北电子科技有限公司 | A kind of lamp controller and method for controlling lamp |
| CN110167231B (en) * | 2019-05-29 | 2024-05-28 | 深圳市和惠源电子科技有限公司 | Silicon controlled rectifier dimming device with dial circuit and LED lamp |
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| CN203872402U (en) * | 2014-05-22 | 2014-10-08 | 厦门锜仕达光电科技有限公司 | Circuit structure of multi-gear light-adjustable LED driving power supply |
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