CN111555742A - Combination switch element and uninterrupted power source - Google Patents
Combination switch element and uninterrupted power source Download PDFInfo
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- CN111555742A CN111555742A CN202010377967.7A CN202010377967A CN111555742A CN 111555742 A CN111555742 A CN 111555742A CN 202010377967 A CN202010377967 A CN 202010377967A CN 111555742 A CN111555742 A CN 111555742A
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- 239000004065 semiconductor Substances 0.000 abstract description 3
- 229910052710 silicon Inorganic materials 0.000 abstract description 3
- 239000010703 silicon Substances 0.000 abstract description 3
- 229910044991 metal oxide Inorganic materials 0.000 abstract description 2
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/51—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used
- H03K17/56—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices
- H03K17/567—Circuits characterised by the use of more than one type of semiconductor device, e.g. BIMOS, composite devices such as IGBT
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
- H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
- H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
- H02J9/062—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems for AC powered loads
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
- H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
- H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
- H02J9/068—Electronic means for switching from one power supply to another power supply, e.g. to avoid parallel connection
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Abstract
The invention discloses a combined switch element and an uninterruptible power supply, wherein the combined switch element comprises an MOS (metal oxide semiconductor) tube, an SCR (silicon controlled rectifier) and a clamping device, the anode of the SCR forms the anode of the combined switch element, and the source electrode of the MOS tube forms the cathode of the combined switch element; the gate electrode of the SCR forms a first signal input end of the combined switching element, and the gate electrode of the MOS tube forms a second signal input end of the combined switching element; the cathode of the SCR is connected with the drain electrode of the MOS tube; and two ends of the clamping device are respectively connected with the source electrode and the drain electrode of the MOS tube. The combined switch element fully combines the characteristics of large current resistance and large voltage resistance of the SCR and the characteristics of small voltage resistance and large current resistance of the MOS tube, so that the combined switch element can be applied to the environment with large current and high voltage, and has low cost and high on-off speed. According to the uninterrupted power supply, the bypass switch is formed by reversely connecting the two combined switch elements in parallel, so that the main circuit and the bypass are effectively prevented from being simultaneously conducted and disconnected when the main circuit and the bypass are switched mutually.
Description
Technical Field
The invention relates to the field of switching devices, in particular to a combined switching element and an uninterruptible power supply.
Background
Thyristors (Thyristor) are short for thyristors, also called silicon controlled rectifiers, and are denoted in the circuit by the letter "V", "VT", and in the old standard by the letter "SCR". SCR is a bipolar device, has high blocking voltage, low on-state voltage and large current capacity, and is used in large and medium power equipment, so that SCR is widely used in circuits of various electronic equipment and electronic products, and is mainly used for controllable rectification, inversion, frequency conversion, voltage regulation, contactless switching and the like.
The SCR is a current type control device, the inside of the SCR is a PNP four-layer semiconductor structure, the SCR is a solid-state switch, and is easy to be triggered and conducted by narrow pulses applied to a gate pole, and the SCR can still maintain conduction after the pulses disappear; however, SCR is a semi-controlled device, which requires an external voltage or an external circuit to turn off once it is turned on, thereby limiting the application of SCR.
In addition, in order to improve the reliability of power supply, an existing Uninterruptible Power Supply (UPS) is usually configured with two power inputs, namely, a main power input and a bypass power input, the main power input is supplied with power through mains supply or supplied with power through an energy storage unit (such as a storage battery) when the mains supply fails, the bypass power input is connected with a standby power supply (such as other mains supply or power generation of a generator), and the standby power input is supplied with power through the standby power supply when the main power input fails, that is, the main power input and the bypass power input of the UPS are not usually operated at the same time. However, since the bypass switch mostly adopts SCR, and the turn-off of SCR needs to reduce the current flowing through the thyristor to a value below a certain value close to zero under the action of an external voltage or an external circuit, and non-ideal conduction of switching elements such as SCR and the like exists, that is, there is a delay when conducting, so that there may be a case that the bypass and the main circuit are simultaneously conducted due to the long turn-off time of SCR in the process of switching the bypass to the main circuit, and there may be a case that the bypass is disconnected and powered off due to the delay of SCR conducting in the process of switching the main circuit to the bypass, thereby affecting the use.
Disclosure of Invention
The present invention is directed to overcoming the above-mentioned drawbacks and problems of the prior art, and providing a combination switching device, which can control the turn-on and turn-off of an SCR, can be applied to an environment with large current and large voltage, and has low cost and fast turn-on and turn-off speed; meanwhile, the invention also provides the uninterrupted power supply, which can effectively prevent the main circuit and the bypass from being conducted at the same time and from being disconnected and powered off in the process of mutually switching the main circuit and the bypass.
In order to achieve the purpose, the invention adopts the following technical scheme:
according to the first technical scheme, the combined switch element comprises an MOS (metal oxide semiconductor) tube, an SCR (silicon controlled rectifier) and a clamping device, wherein the anode of the SCR forms the anode of the combined switch element, and the source of the MOS tube forms the cathode of the combined switch element; the gate electrode of the SCR forms a first signal input end of the combined switching element, and the gate electrode of the MOS tube forms a second signal input end of the combined switching element; the drain electrode of the MOS tube is connected with the cathode of the SCR; and two ends of the clamping device are respectively connected with the source electrode and the drain electrode of the MOS tube.
Based on the first technical scheme, a second technical scheme is further provided, wherein in the second technical scheme, the clamping device is a transient suppression diode, an anode of the transient suppression diode is connected with a source electrode of the MOS transistor, and a cathode of the transient suppression diode is connected with a drain electrode of the MOS transistor.
Based on the first technical scheme, a third technical scheme is further provided, wherein in the third technical scheme, the clamping device is a voltage stabilizing diode, an anode of the voltage stabilizing diode is connected with a source electrode of the MOS tube, and a cathode of the voltage stabilizing diode is connected with a drain electrode of the MOS tube.
According to the fourth technical scheme, the invention also provides an uninterruptible power supply which comprises an inversion output module and a bypass output module, wherein the inversion output module and the bypass output module are both connected with the output end of the uninterruptible power supply; the bypass output module is connected to the output end of the uninterruptible power supply through the bypass switch, and the bypass switch is formed by reversely connecting the combined switch elements of any one of the first technical scheme, the second technical scheme and the third technical scheme in parallel.
Based on the fourth technical scheme, the uninterruptible power supply further comprises a fifth technical scheme, wherein the fifth technical scheme further comprises an inverter output switch, the inverter output module is connected to the output end of the uninterruptible power supply through the inverter output switch, and the inverter output switch is formed by reversely connecting the combined switch elements of any one of the first technical scheme, the second technical scheme and the third technical scheme in parallel and further comprises a bypass switch.
Based on the fourth technical scheme, the uninterruptible power supply further comprises a sixth technical scheme, wherein the sixth technical scheme further comprises a first current sensing module for acquiring the direction of the bypass current between the bypass output module and the output end of the uninterruptible power supply; the input module is used for receiving and outputting an input instruction, wherein the input instruction comprises a side-by-side main switching instruction; and the control module is used for closing the working combined switch element corresponding to the bypass current direction according to the bypass main switching instruction and the bypass current direction.
Based on the fifth technical scheme, a seventh technical scheme is further provided, wherein the seventh technical scheme further comprises a first current sensing module for acquiring the direction of the bypass current between the bypass output module and the output end of the uninterruptible power supply; the second current sensing module is used for acquiring the main circuit current direction from the inversion output module to the output end of the uninterruptible power supply; the input module is used for receiving input instructions, and the input instructions comprise main-direction and side-direction main switching instructions; and a control module, when receiving a main-to-side switching instruction, for turning off the working combination switch element corresponding to the main-circuit current direction according to the main-circuit current direction; and when receiving a side-by-side main switching instruction, the control circuit is used for closing the working combined switch element corresponding to the bypass current direction according to the bypass current direction.
The invention also provides another uninterrupted power supply, which is marked as a technical scheme eight below and comprises an inversion output module and a bypass output module, wherein the inversion output module and the bypass output module are both connected with the output end of the uninterrupted power supply; the inverter output module is connected to the output end of the uninterruptible power supply through the inverter output switch, and the inverter output switch is formed by reversely connecting the combined switch elements of any one of the first technical scheme, the second technical scheme and the third technical scheme in parallel.
Based on the eighth technical scheme, the uninterruptible power supply further comprises a ninth technical scheme, wherein in the ninth technical scheme, the uninterruptible power supply comprises a second current sensing module, and the second current sensing module is used for acquiring the main path current direction from the inversion output module to the output end of the uninterruptible power supply; the input module is used for receiving and outputting an input instruction, wherein the input instruction comprises a main-direction side-by-side switching instruction; and the control module is used for turning off the working combined switch element corresponding to the main circuit current direction according to the main-to-side switching command and the main circuit current direction.
As can be seen from the above description of the present invention, the present invention has the following advantages over the prior art:
1. in the first technical scheme, the combined switch element of the invention connects the SCR and the MOS tube in series, and when the combined switch element needs to be conducted, driving current driving signals are respectively injected into the first signal input end and the second signal end, so that the SCR and the MOS tube are both in a conducting state; when the combined switch element needs to be closed, a turn-off signal is applied to the second signal input end to enable the MOS to be in a turn-off state, after the MOS tube is turned off, the current flowing through the SCR is reduced to be below a certain numerical value close to zero, and the SCR is turned off. When the MOS tube is turned off, the potential of the drain end of the MOS tube is increased, and the clamping device can enable current to flow through the clamping device, so that the MOS tube is prevented from being damaged. The combined switch element fully combines the characteristics of large current resistance and large voltage resistance of the SCR and the characteristics of small voltage resistance and large current resistance of the MOS tube, so that the combined switch element can be applied to the environment with large current and high voltage, and has low cost and high on-off speed.
2. In the second technical scheme, the clamping device is a transient suppression diode, the response is more sensitive, and the cost is low.
3. In the third technical scheme, the clamping device is a voltage stabilizing diode, and the cost is low.
4. In the fourth technical scheme, the invention also provides an uninterruptible power supply, a bypass switch of a bypass output module is formed by connecting two combined switch elements in parallel, and replaces the SCR in the prior art, the combined switch elements only need to inject driving current driving signals into a first signal input end and a second signal input end respectively when being switched on, and only need to apply a turn-off signal to the second signal input end when being switched off, so that the switching-on and the turn-off speeds are high, therefore, in the process of switching a main circuit and a bypass mutually, such as in the process of switching the bypass to the main circuit, the turn-off speed of the combined switch elements is high, the situation that an inverter output module and a bypass output module are simultaneously switched on due to overlong turn-off time of the bypass output module can not occur, and in the process of switching the main circuit to the bypass, as the combined switch elements are switched on by adopting the injection current driving signals, and the SCR is, the gate pole is injected with the driving current to conduct, and the combined switch element is more ideal in conduction, namely, the conduction speed is higher, so that the condition that the bypass output module is disconnected and powered off due to delayed conduction of the bypass switch can be avoided; and the combined switch element can resist high voltage and high current, and is safer.
5. In the fifth technical scheme, an inversion output switch of the inversion output module is formed by reversely connecting two combined switch elements in parallel, so that mutual switching of a bypass and a main circuit can be controlled by controlling on-off of the bypass switch and the inversion output switch, for example, in the process of switching the bypass to the main circuit, the bypass switch can be controlled to be turned off and the inversion output switch can be controlled to be turned on, because the on-off speed of the bypass switch and the inversion output switch is high, the situation that the inversion output module and the bypass output module are simultaneously turned on due to overlong turn-off time of the bypass switch is not easy to occur, or the situation that the inversion output module is disconnected and powered off due to prolonging of the turn-on time of the inversion output switch is not easy to occur, and the process. Therefore, the uninterrupted power supply effectively prevents the condition that the inversion output module and the bypass output module are simultaneously conducted and the condition that the inversion output module or the bypass output module is disconnected and powered off in the process of mutually switching the main circuit and the bypass.
6. In the sixth technical scheme, when the uninterruptible power supply is in the bypass mode, at a certain moment, only one of two anti-parallel combined switch elements on the bypass switch is in a working state, and when the control module receives a bypass main switching instruction, the bypass switch is generally closed, but in the technical scheme, the control module can know the currently working combined switch element according to the direction of bypass current, so that the working combined switch element is closed, namely only one of the two anti-parallel combined switch elements on the bypass switch is closed, because when the bypass switches the main circuit, the bypass is supplied with power by the standby power supply, and the standby power supply is also closed, so that the bypass output can be completely closed without closing the two combined switch elements, and redundant switching action is avoided.
7. In the seventh technical scheme, the mutual switching between the bypass and the main circuit can be controlled by controlling the on-off of the bypass switch and the inverter output switch, when the uninterruptible power supply is in the main circuit mode, only one of the two anti-parallel combined switch elements on the inverter output switch is in a working state at a certain moment, the control module can generally turn off the inverter output switch when receiving a main-to-side switching instruction, and in the technical scheme, the control module can know the currently working combined switch element according to the current direction of the main circuit, so as to turn off the currently working combined switch element, namely only one of the two anti-parallel combined switch elements on the inverter output switch is turned off, because the inverter output module is also turned off when the main circuit switches the bypass, so that the main circuit output can be completely turned off without turning off the two combined switch elements, thereby avoiding redundant switching actions; when the uninterruptible power supply is in a bypass mode, only one of two anti-parallel combined switch elements on the bypass switch is in a working state at a certain moment, and the control module can close the bypass switch generally when receiving a bypass main switching instruction, and the control module can know the currently working combined switch element according to the direction of bypass current in the technical scheme, so that the working combined switch element is closed, namely only one of the two anti-parallel combined switch elements on the bypass switch is closed, because the bypass is supplied with power by the standby power supply when the bypass switches the main circuit, and the standby power supply can be closed, so that bypass output can be completely closed without closing the two combined switch elements, and redundant switching action is avoided.
8. In the eighth technical solution, the inverter output switch of the inverter output module is formed by connecting two combined switch elements in parallel, which replaces the SCR in the prior art, the combined switch element only needs to inject driving current driving signals into the first signal input terminal and the second signal input terminal respectively when being turned on, and only needs to apply a turn-off signal to the second signal input terminal when being turned off, so that the turn-on and turn-off speeds are fast, and thus the situation that the inverter output module and the bypass output module are simultaneously turned on due to the overlong turn-off time of the inverter output module is avoided in the process of switching the main circuit and the bypass, and in the process of switching the bypass to the main circuit, the combined switch element is turned on by injecting a current driving signal, and the SCR is turned on when bearing a forward voltage, and the driving current is injected into the gate, the combined switch element is more ideal in conduction, namely the conduction speed is higher, so that the condition that the inverter output module is disconnected and powered off due to delayed conduction of the inverter output switch can be avoided; and the combined switch element can resist high voltage and high current, and is safer.
9. In the ninth technical scheme, when the uninterruptible power supply is in the main circuit mode, at a certain moment, only one of two reverse parallel combination switch elements on the inverter output switch is in a working state, when the control module receives a main-to-side switching instruction, the inverter output switch can be generally closed, and in the technical scheme, the control module can know the combination switch element which is currently working according to the current direction of the main circuit, so that the working combination switch element is closed, namely only one of the two reverse parallel combination switch elements on the inverter output switch is closed, because when the main circuit switches the bypass, the inverter output module can be closed, so that the main circuit output can be completely closed without closing the two combination switch elements, and redundant switching action is avoided.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic diagram of an embodiment of the present invention.
Fig. 2 is a schematic diagram of an ups according to an embodiment of the invention.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. It is to be understood that the described embodiments are presently preferred embodiments of the invention and are not to be taken as an exclusion of other embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
In the claims, the specification and the drawings of the present invention, unless otherwise expressly limited, the terms "first", "second" or "third", etc. are used for distinguishing between different items and not for describing a particular sequence.
In the claims, the specification and the drawings of the present invention, the terms "including", "having" and their variants, if used, are intended to be inclusive and not limiting.
As shown in fig. 1, a combined switch element comprises a MOS transistor Q, SCR and a clamping device, wherein the anode of the SCR forms an anode 1 of the combined switch element, and the source of the MOS transistor Q forms a cathode 2 of the combined switch element; the gate electrode of the SCR forms a first signal input end 3 of the combined switching element, and the gate electrode of the MOS tube forms a second signal input end 4 of the combined switching element; the drain electrode of the MOS tube Q is connected with the cathode of the SCR; the two ends of the clamping device are respectively connected with the source electrode and the drain electrode of the MOS tube Q, wherein the clamping device is a transient suppression diode or a voltage stabilizing diode, the TVS tube is a new product developed on the basis of a voltage stabilizing tube process, the shape of the TVS tube is the same as that of a common diode, when the two ends of the TVS tube are subjected to instantaneous high-energy impact, the TVS tube can reduce the impedance of the TVS tube suddenly at the nanosecond level, absorb a large current and clamp the voltage between the two ends of the TVS tube on a preset value, and therefore circuit elements are prevented from being damaged by the impact of transient high energy. In this embodiment, the clamping diode is a voltage stabilizing diode D, an anode of the voltage stabilizing diode D is connected to a source of the MOS transistor Q, and a cathode of the voltage stabilizing diode D is connected to a drain of the MOS transistor Q.
In this embodiment, the MOS transistor Q is an N-type MOS transistor, it should be understood that the MOS transistor may also be a P-type MOS transistor, which is not described in detail herein.
According to the combined switch element, the SCR is connected with the MOS tube in series, when the combined switch element needs to be conducted, driving current signals are respectively injected into the first signal input end 3 and the second signal input end 4, and at the moment, when the gate pole voltage is positive and the combined switch element bears positive voltage, the thyristor SCR enters a conducting state; if the bearing voltage is positive all the time, the thyristor is conducted all the time until the main circuit voltage or current is reduced to zero, and the thyristor is turned off, so that the gate pole only plays a triggering role. And a voltage V exists between the grid G and the source S of the MOS tubeGSThe MOS tube is in the amplifying region, and the drain D and the source S of the MOS tube are also conducted. Therefore, the SCR and the MOS tube are both in a conducting state, when the combined switch element needs to be closed, a turn-off signal is applied to the second signal input end 4 to enable the MOS tube to be in a turn-off state, when the MOS tube is turned off, the potential of the drain end of the MOS tube is increased, the clamping device is arranged to enable current to flow through the clamping device, the MOS tube is prevented from being damaged, and after the MOS tube is turned off, the current flowing through the SCR is reduced to be lower than a certain numerical value close to zero, and the SCR is turned off. The combined switch element of the invention fully combines the characteristics of large current resistance and large voltage resistance of SCR and the characteristics of small voltage resistance and large current resistance of MOS tube, so that the combined switch element canThe switch is applied to the environment with large current and high voltage, and has low cost and high on-off speed.
The invention also provides an uninterruptible power supply, as shown in fig. 2, the uninterruptible power supply includes an inversion output module, an inversion output switch 23, a bypass output module and a bypass switch 10, wherein the inversion output module includes a rectification unit 20, an energy storage unit 21 and an inverter 22, the inversion output module is connected to the output end of the uninterruptible power supply through the inversion output switch 23, the inversion output switch 23 is formed by connecting two combined switch elements in reverse parallel, the bypass output module is connected to the output end of the uninterruptible power supply through the bypass switch 10, and the bypass switch 10 is formed by connecting two combined switch elements in reverse parallel.
It should be understood that the main circuit may not be provided with the inverter output switch 23, but only the bypass switch 10 is provided on the bypass, the output of the main circuit may be controlled by turning on and off the inverter output module, and in the process of switching the bypass to the main circuit, the bypass output may be turned off by turning off the bypass switch 10, so that the uninterruptible power supply operates in the main circuit mode; similarly, the bypass switch 10 may not be provided, but only the main circuit may be provided with the inverter output switch 23, the output of the bypass may be controlled by the standby power source for turning on and off the bypass, and in the process of switching the main circuit to the bypass, the main circuit output may be turned off by turning off the inverter output switch 23, so that the uninterruptible power supply operates in the bypass mode. The present embodiment preferably implements the switching between the main circuit and the bypass circuit by providing the inverting output switch and the bypass switch.
When the UPS works in a bypass output mode, the bypass switch 10 can be closed, the inverter output switch 23 is disconnected, and the bypass power input is output to the load through the bypass switch 10.
When the UPS is operating in the main output mode, the inverter output switch 23 may be closed, and the bypass switch 10 may be opened, and the main power input may provide the main power supply to the load through the rectifier unit 20, the inverter 22, and the inverter output switch 23.
The bypass switch 10 and the inversion output switch 23 are formed by connecting two combined switch elements in reverse parallel, and replace the SCR in the prior art, the combined switch elements only need to inject driving current driving signals into the first signal input end 3 and the second signal input end 4 respectively when being switched on, and only need to apply a switching-off signal to the second signal input end 4 when being switched off, so that the switching-on and switching-off speed is faster.
In the prior art, because bypass switch and contravariant output switch all adopt two SCR to connect in reverse in parallel to form, SCR's turn-off speed is slow, in the in-process that main road and bypass switch switched each other, if bypass switch and contravariant output switch are operated simultaneously, close bypass switch when opening contravariant output switch promptly, or close contravariant output switch when opening bypass switch, the condition that main road and bypass switched on simultaneously can appear, and if stagger operation main road switch and bypass switch, open contravariant output switch earlier and then close bypass switch, or open bypass switch earlier and then close contravariant output switch, then probably because SCR non-ideal switches on leads to SCR on-time extension, thereby lead to contravariant output module or bypass output module to break off the power supply.
In this embodiment, the ups further includes a first current sensing module, a second current sensing module, an input module, and a control module (not shown in the figure). The first current sensing module is used for acquiring the direction of a bypass current between the bypass output module and the output end of the uninterruptible power supply, the second current sensing module is used for acquiring the direction of a main circuit current between the inverter output module and the output end of the uninterruptible power supply, and the first current sensing module and the second current sensing module can be realized by circuits or software, which is not described in detail in the invention. The input module is used for receiving input instructions, wherein the input instructions comprise main-direction and side-direction main switching instructions, and the input instructions can be input manually or input by the UPS after being combined with the acquired state information; the control module receives an input instruction, and when the control module receives a main-to-side switching instruction, the control module is used for closing the working combined switch element corresponding to the main path current direction according to the main path current direction; and when the control module receives a side-by-side main switching instruction, the control module is used for closing the working combined switch element corresponding to the bypass current direction according to the bypass current direction.
Specifically, when a main-side switching instruction is input through the input module, after the control module receives the main-side switching instruction, a driving circuit signal is respectively injected into a first signal input end 3 and a second signal input end 4 of two anti-parallel combined switching elements of the bypass switch 10 to turn on the bypass switch 10, a turn-off signal of the inverter 22 is output, a main path current direction of the second current sensing module is inquired, the currently operating combined switching element can be known according to the main path current direction, and therefore the operating combined switching element is turned off, that is, a turn-off signal is applied to the second signal input end 4 of the combined switching element to turn off the combined switching element. It should be understood that the control module controls the bypass switch 10 to be turned on, controls the inverter 22 to be turned off, and controls the working combination switch element corresponding to the main circuit direction to be turned off simultaneously, because the turning-on and turning-off speed of the combination switch element is fast, the working combination switch element on the inversion output switch 23 is turned off first compared with the inverter, and the inverter is turned off before the other combination switch element in the non-working state on the inversion output switch 23 enters the working state, so that the main circuit output is completely turned off; and because the on-state speed of the bypass switch 10 is fast, the off-state speed of the inverter output switch 23 is fast, the situation that the inverter output module and the bypass output module are simultaneously on due to the fact that the off-state time of the inverter output switch 23 is too long is not easy to occur, or the situation that the bypass output module is disconnected and powered off due to the fact that the on-state time of the bypass switch 10 is prolonged is not easy to occur, the effect that the main circuit output can be closed only by closing one of two reversely parallel combined switch elements on the inverter output switch 23 is achieved, and redundant switching action is avoided.
When a side-by-side main switching instruction is input through the input module, after the control module receives the side-by-side main switching instruction, driving circuit signals are respectively injected into a first signal input end 3 and a second signal input end 4 of two reverse parallel-connected combined switch elements of the inversion output switch 23 to turn on the inversion output switch 23, a turn-off signal of the standby power supply is output, the bypass current direction of the first current sensing module is inquired, the currently working combined switch element can be known according to the bypass current direction, and therefore the working combined switch element is turned off, namely a turn-off signal is applied to the second signal input end 4 of the combined switch element to turn off the combined switch element. It should be understood that the control module controls the inverter output switch 23 to be turned on, controls the standby power supply to be turned off, and controls the working combined switch element corresponding to the direction of the bypass circuit to be turned off simultaneously, because the turning-on and turning-off speed of the combined switch element is fast, the working combined switch element on the bypass switch 10 is turned off first compared with the standby power supply, and the standby power supply is turned off before the other non-working combined switch element on the bypass switch 10 enters the working state, so as to completely turn off the bypass output; and because the on-state speed of the inverter output switch 23 is fast, the off-state speed of the bypass switch 10 is fast, the situation that the inverter output module and the bypass output module are simultaneously on due to the fact that the off-state time of the bypass switch 10 is too long is not easy to occur, or the situation that the bypass output module is disconnected and powered off due to the fact that the on-state time of the inverter output switch 23 is prolonged is not easy to occur, the effect that the bypass output can be closed only by closing one of two reversely parallel combined switch elements on the bypass switch 10 is achieved, and redundant switching actions are avoided.
In the process of switching the main circuit and the bypass, the uninterrupted power supply effectively prevents the condition that the inverter output module and the bypass output module are simultaneously conducted and the condition that the inverter output module or the bypass output module is disconnected and powered off, avoids redundant switching actions, and is safer because the combined switching element can resist high voltage and high current.
The description of the above specification and examples is intended to be illustrative of the scope of the present invention and is not intended to be limiting. Modifications, equivalents and other improvements which may occur to those skilled in the art and which may be made to the embodiments of the invention or portions thereof through a reasonable analysis, inference or limited experimentation, in light of the common general knowledge, the common general knowledge in the art and/or the prior art, are intended to be within the scope of the invention.
Claims (9)
1. A combination switching element, characterized by: comprises an MOS tube, an SCR and a clamping device,
the anode of the SCR forms the anode of the combined switch element, and the source of the MOS tube forms the cathode of the combined switch element;
the gate electrode of the SCR forms a first signal input end of the combined switching element, and the gate electrode of the MOS tube forms a second signal input end of the combined switching element;
the cathode of the SCR is connected with the drain electrode of the MOS tube;
and two ends of the clamping device are respectively connected with the source electrode and the drain electrode of the MOS tube.
2. A combination switching element according to claim 1, wherein: the clamping device is a transient suppression diode, the anode of the transient suppression diode is connected with the source electrode of the MOS tube, and the cathode of the transient suppression diode is connected with the drain electrode of the MOS tube.
3. A combination switching element according to claim 1, wherein: the clamping device is a voltage stabilizing diode, the anode of the voltage stabilizing diode is connected with the source electrode of the MOS tube, and the cathode of the voltage stabilizing diode is connected with the drain electrode of the MOS tube.
4. An uninterruptible power supply, comprising: the system comprises an inversion output module and a bypass output module, wherein the inversion output module and the bypass output module are both connected with the output end of the uninterruptible power supply;
further comprising a bypass switch by which the bypass output module is connected to an output of an uninterruptible power supply, the bypass switch being formed by antiparallel connection of the two combined switching elements of any of claims 1-3.
5. The uninterruptible power supply of claim 4, wherein: the inverter circuit further comprises an inverter output switch, the inverter output module is connected to an output end of an uninterruptible power supply through the inverter output switch, the inverter output switch is formed by connecting the combined switch elements of any one of the two claims 1-3 in an anti-parallel mode, and the inverter circuit further comprises a bypass switch.
6. The uninterruptible power supply of claim 4, wherein: comprises that
The first current sensing module is used for acquiring the direction of bypass current between the bypass output module and the output end of the uninterruptible power supply;
the input module is used for receiving and outputting an input instruction, wherein the input instruction comprises a side-by-side main switching instruction; and
and the control module is used for closing the working combined switch element corresponding to the bypass current direction according to the bypass main switching instruction and the bypass current direction.
7. The uninterruptible power supply of claim 5, wherein: comprises that
The first current sensing module is used for acquiring the direction of bypass current between the bypass output module and the output end of the uninterruptible power supply;
the second current sensing module is used for acquiring the main circuit current direction from the inversion output module to the output end of the uninterruptible power supply;
the input module is used for receiving input instructions, and the input instructions comprise main-direction and side-direction main switching instructions; and
the control module is used for turning off the working combined switch element corresponding to the main circuit current direction according to the main circuit current direction when receiving a main-to-side switching instruction; and when receiving a side-by-side main switching instruction, the control circuit is used for closing the working combined switch element corresponding to the bypass current direction according to the bypass current direction.
8. An uninterruptible power supply, comprising: the system comprises an inversion output module and a bypass output module, wherein the inversion output module and the bypass output module are both connected with the output end of the uninterruptible power supply;
the uninterruptible power supply further comprises an inversion output switch, the inversion output module is connected to the output end of the uninterruptible power supply through the inversion output switch, and the inversion output switch is formed by reversely connecting the combined switch elements of any one of the two claims 1 to 3 in parallel.
9. The uninterruptible power supply of claim 8, wherein: comprises that
The second current sensing module is used for acquiring the main circuit current direction from the inversion output module to the output end of the uninterruptible power supply;
the input module is used for receiving and outputting an input instruction, wherein the input instruction comprises a main-direction side-by-side switching instruction; and
and the control module is used for turning off the working combined switch element corresponding to the main circuit current direction according to the main-to-side switching command and the main circuit current direction.
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| CN202010377967.7A CN111555742A (en) | 2020-05-07 | 2020-05-07 | Combination switch element and uninterrupted power source |
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| CN202010377967.7A CN111555742A (en) | 2020-05-07 | 2020-05-07 | Combination switch element and uninterrupted power source |
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Application publication date: 20200818 |