Trigger circuit for bidirectional thyristor, and power electronic apparatus

Abstract

A trigger circuit (10) for a bidirectional thyristor, and a power electronic apparatus. The trigger circuit can be used for bypassing a power module (PM) by means of controlling a bidirectional thyristor (T). The trigger circuit comprises a first trigger module (1) and a transmission module (TR), wherein the first trigger module is used for outputting a first pulse signal on the basis of a driving signal from the power module, and the transmission module is used for transmitting the first pulse signal to the bidirectional thyristor, such that the bidirectional thyristor is short circuited or is bidirectionally turned on. Therefore, the bidirectional thyristor can be quickly controlled to short circuit or the bidirectional thyristor is bidirectionally turned on, such that the safety of the power module is ensured; moreover, the risk of a mechanical structure of an electromagnetic vacuum switch getting jammed and failing to operate and the problem of the switch-on reliability being poor due to an impulse current can be avoided, and the problems of long action time, poor maintenance convenience, etc., present in a gas expansion type disposable switch can also be avoided.

Description

A trigger circuit and power electronic device for bidirectional thyristor Technical Field

[0001] The present application relates to the field of power electronics, and in particular to a trigger circuit and a power electronics device for a bidirectional thyristor. Background Art

[0002] The power modules in power electronic devices such as modular multilevel converters (MMCs) and static var generators (SVGs) are typically cascaded. To ensure device availability in the event of a power module failure, related technologies often employ mechanical switches such as electromagnetic vacuum switches and gas expansion single-use switches to remove the faulty power module from the device. However, electromagnetic vacuum switches have a long operating time, a risk of mechanical jamming and refusal to operate, and inrush currents can lead to poor closing reliability. Gas expansion single-use switches also have a long operating time and poor maintenance.

[0003] Summary of the Invention

[0004] To address the long operating time issues associated with conventional mechanical switches, this application provides a trigger circuit for a bidirectional thyristor (TRIAC), which controls the TRIAC to bypass a power module. The trigger circuit may include a first trigger module and a transmission module. The first trigger module is connected to the power module, the first trigger module is further connected to the transmission module, and the transmission module is connected to the TRIAC.

[0005] The first trigger module is used to output a first pulse signal according to the driving signal from the power module.

[0006] The transmission module is used for transmitting the first pulse signal to the bidirectional thyristor to short-circuit the bidirectional thyristor or conduct in both directions.

[0007] Optionally, the amplitude, pulse width and frequency of the first pulse signal are all fixed. Alternatively, at least one of the amplitude, pulse width and frequency of the first pulse signal increases in sequence.

[0008] In some possible implementations, the first trigger module includes a switch tube, a first resistor, and a first capacitor.

[0009] The control electrode of the switching tube is used to connect to the power module, the first electrode of the switching tube is connected to the first end of the first resistor, the second electrode of the switching tube is connected to the first end of the first capacitor, and the second ends of the first resistor and the first capacitor are respectively connected to the transmission module.

[0010] In some other possible implementations, the first trigger module also includes an acquisition module, the first input end of the acquisition module is connected to the second end of the first resistor, the second input end of the acquisition module is connected to the second end of the first capacitor, and the output end of the acquisition module is connected to the power module.

[0011] The acquisition module is used to obtain a first pulse signal, convert the first pulse signal into a digital signal and output it to the power module.

[0012] The power module is used to control the output of the drive signal according to the digital signal.

[0013] Furthermore, the trigger circuit further includes a second trigger module, wherein the first input terminal and the second input terminal of the second trigger module are both connected to the submodule capacitor in the power module, and the first output terminal and the second output terminal of the second trigger module are both connected to the transmission module.

[0014] The second trigger module is used to output a second pulse signal to the transmission module according to the voltage of the sub-module capacitor.

[0015] The transmission module is further used to transmit the second pulse signal to the bidirectional thyristor to short-circuit the bidirectional thyristor.

[0016] Optionally, the second trigger module includes a second capacitor, a third capacitor, a second resistor, a third resistor, a fourth resistor and a first breakdown diode.

[0017] The first ends of the second capacitor and the second resistor are connected to each other, serving as the first input end of the second trigger module. The first ends of the third capacitor and the third resistor are connected to each other, serving as the second input end and the second output end of the second trigger module. The second ends of the second capacitor, the third capacitor, the second resistor, and the third resistor are connected to each other and to the anode of the first breakdown diode. The cathode of the first breakdown diode is connected to the first end of the fourth resistor. The second end of the fourth resistor serves as the first output end of the second trigger module.

[0018] Exemplarily, the trigger circuit further includes a third trigger module and a fourth trigger module.

[0019] Among them, the first input end of each of the third trigger module and the fourth trigger module is connected to the transmission module, the second input end of the third trigger module is connected to the second pole of the bidirectional thyristor, and the second input end of the fourth trigger module is connected to the first pole of the bidirectional thyristor; the output end of the third trigger module is connected to the first control pole of the bidirectional thyristor, and the output end of the fourth trigger module is connected to the second control pole of the bidirectional thyristor.

[0020] The third trigger module is used to output a third pulse signal to the bidirectional thyristor according to the voltage between the second electrode and the first control electrode of the bidirectional thyristor to cause the bidirectional diode to be unidirectionally short-circuited.

[0021] The fourth trigger module is used for outputting a fourth pulse signal to the bidirectional thyristor according to the voltage between the first electrode and the second control electrode of the bidirectional thyristor to cause the bidirectional diode to be unidirectionally short-circuited.

[0022] Optionally, the third trigger module includes a fifth resistor, a sixth resistor and a second breakdown diode.

[0023] The first end of the fifth resistor serves as the first input end of the third trigger module. The second end of the fifth resistor is connected to the first end of the sixth resistor, serving as the output end of the third trigger module. The second end of the sixth resistor is connected to the cathode of the second breakdown diode. The anode of the second breakdown diode serves as the second input end of the third trigger module and is connected to the second electrode of the bidirectional thyristor.

[0024] The fourth trigger module includes a seventh resistor, an eighth resistor and a third breakdown diode.

[0025] The first end of the seventh resistor serves as the first input end of the fourth trigger module. The second end of the seventh resistor is connected to the first end of the eighth resistor, serving as the output end of the fourth trigger module. The second end of the eighth resistor is connected to the cathode of the third breakdown diode. The anode of the third breakdown diode serves as the second input end of the fourth trigger module and is connected to the first electrode of the bidirectional thyristor.

[0026] In some possible implementations, the transmission module includes a first primary winding, a second primary winding, a first secondary winding, and a second secondary winding.

[0027] The first end of the first primary winding is connected to the second end of the first resistor, and the second end of the first primary winding is connected to the second end of the first capacitor. The first end of the second primary winding is connected to the first output end of the second trigger module, and the second end of the second primary winding is connected to the second output end of the second trigger module. The first end of the first secondary winding is connected to the first input end of the third trigger module, and the second end of the first secondary winding is connected to the first electrode of the bidirectional thyristor. The first end of the second secondary winding is connected to the first input end of the fourth trigger module, and the second end of the second secondary winding is connected to the second electrode of the bidirectional thyristor.

[0028] Exemplarily, the bidirectional thyristor includes an anode side housing, a first molybdenum sheet layer, a chip layer, a second molybdenum sheet layer and a cathode side housing that are stacked.

[0029] The bidirectional thyristor further includes a first metal layer and / or a second metal layer. The first metal layer is stacked between the anode side housing and the first molybdenum sheet layer, and the second metal layer is stacked between the cathode side housing and the second molybdenum sheet layer.

[0030] In another aspect, the present application further provides a power electronic device comprising a power module, a bidirectional thyristor and the above-mentioned trigger circuit, wherein the trigger circuit is connected to the bidirectional thyristor and the trigger circuit is also connected to the power module.

[0031] Optionally, the power electronic device may be a modular multilevel converter (MMC), a static var generator (SVG), or the like.

[0032] Compared with the prior art, the present invention has the following advantages:

[0033] The trigger circuit for the bidirectional thyristor provided in the present application can be used to bypass the power module by controlling the bidirectional thyristor, the first trigger module is used to output a first pulse signal according to the drive signal from the power module, and the transmission module is used to transmit the first pulse signal to the bidirectional thyristor to short-circuit the bidirectional thyristor or conduct it in both directions. In other words, the present application can bypass the power module by controlling the bidirectional thyristor to short-circuit by the first pulse signal, and can also bypass the power module by controlling the bidirectional thyristor to conduct it in both directions by the first trigger module. Compared with the mechanical switch, the present application can quickly control the short circuit of the bidirectional thyristor or conduct the bidirectional thyristor in both directions to ensure the safety of the power module. At the same time, it avoids the risk of jamming and refusal to operate of the mechanical structure of the electromagnetic vacuum switch and the problem of poor closing reliability caused by the impact current, and can also avoid the problems of long action time and poor maintenance convenience of the gas expansion disposable switch.

[0034] The amplitude, pulse width, and frequency of the first pulse signal used to trigger the bidirectional thyristor in this application are fixed, that is, a single-group triggering method can be used to enable the bidirectional thyristor to continuously conduct current in the same direction to achieve bidirectional conduction. Of course, at least one of the amplitude, pulse width, and frequency of the first pulse signal can be increased in sequence, that is, a single-group multi-stage triggering method can be used to gradually reduce the blocking resistance of the bidirectional thyristor, ultimately achieving a short circuit of the bidirectional thyristor.

[0035] The present application can bidirectionally short-circuit the bidirectional thyristor and the bidirectional diode through the third pulse signal output by the third trigger module and the fourth pulse signal output by the fourth trigger module, thereby realizing bypass of the power module.

[0036] The bidirectional thyristor in this application is provided with a first metal layer and / or a second metal layer, and the first metal layer and / or the second metal layer are made of a metal with a high resistivity. When a large current flows through the bidirectional thyristor, the large amount of heat generated by the first metal layer and the second metal layer can quickly damage the bidirectional thyristor, causing the bidirectional thyristor to short-circuit, while reducing the heat dissipation of the external resistor. At the same time, the bidirectional thyristor in this application can reduce the short-circuit current of the bidirectional thyristor by more than 2 times, thereby reducing the difficulty of explosion-proof design of the power module.

[0037] In the present application, the acquisition module of the first trigger module can be used to convert the acquired first pulse signal into a digital signal and output it to the power module. The power module controls the output of the drive signal based on the digital signal. In other words, the present application can implement feedback of the first pulse signal through the acquisition module, and further implement control of the drive signal through the first pulse signal. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the technical solutions in the present application or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0039] FIG1 is a schematic diagram showing the connection between a single bidirectional thyristor and a single power module in an embodiment of the present application;

[0040] FIG2 is a schematic diagram showing the connection between multiple bidirectional thyristors and multiple power modules in an embodiment of the present application;

[0041] FIG3 is a schematic diagram showing the connection between a bidirectional thyristor and a power module adopting a half-bridge topology structure in an embodiment of the present application;

[0042] FIG4 is a schematic diagram showing the connection between a bidirectional thyristor and a power module adopting a full-bridge topology structure according to an embodiment of the present application;

[0043] FIG5 is a schematic diagram showing the connection between a bidirectional thyristor and a power module adopting a three-level topology structure according to an embodiment of the present application;

[0044] FIG6 is a schematic structural diagram of a bidirectional thyristor according to an embodiment of the present application;

[0045] FIG7 is a schematic structural diagram of a trigger circuit in an embodiment of the present application;

[0046] FIG8 is a schematic waveform diagram of a first pulse signal in an embodiment of the present application;

[0047] FIG9 is another schematic waveform diagram of the first pulse signal in an embodiment of the present application;

[0048] FIG10 is a schematic diagram of the structure of the trigger circuit in an embodiment of the present application. DETAILED DESCRIPTION

[0049] The technical solution in this application will be described below with reference to the accompanying drawings.

[0050] The terms "first," "second," and the like in the description, embodiments, claims, and drawings of this application are used solely for descriptive purposes and are not to be construed as indicating or implying relative importance or order. Furthermore, the terms "including," "having," and any variations thereof are intended to cover non-exclusive inclusions, such as, for example, inclusion of a series of steps or units. A method, system, product, or apparatus is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0051] It should be understood that in this application, "at least one (item)" means one or more, and "plurality" means two or more. "And / or" is used to describe the association relationship of associated objects, indicating that three relationships may exist. For example, "A and / or B" can mean: only A exists, only B exists, and A and B exist at the same time, where A and B can be singular or plural. The character " / " generally indicates that the previous and next associated objects are in an "or" relationship. "At least one of the following items" or similar expressions refers to any combination of these items, including any combination of single items or plural items. For example, at least one of a, b or c can mean: a, b, c, "a and b", "a and c", "b and c", or "a and b and c", where a, b, c can be single or multiple.

[0052] The present application provides a trigger circuit for a bidirectional thyristor, which is used to bypass a power module (PM) by controlling the bidirectional thyristor to short-circuit. As shown in Figure 1, the first pole of the bidirectional thyristor T can be connected to the power module PM through node E_A1, and the second pole of the bidirectional thyristor T can be connected to the power module PM through node E_A2. Different power modules PM are connected through nodes B1 and B2. The power module PM may include a submodule SM and a submodule capacitor C SM .

[0053] In the case of n (n is greater than or equal to 2) power modules cascaded in series, the n power modules and the n bidirectional thyristors are connected in a one-to-one correspondence, as shown in Figure 2. In Figure 2, different power modules PM are connected via nodes B1 and B2.

[0054] The power module can adopt half-bridge, full-bridge, three-level and other topologies. The details are as follows:

[0055] 1) The power module adopts a half-bridge topology. The connection diagram of the power module PM and the bidirectional thyristor T is shown in Figure 3. In Figure 3, different power modules PM are connected through nodes B1 and B2.

[0056] 2) The power module adopts a full-bridge topology, and the connection diagram of the power module PM and the bidirectional thyristor T is shown in Figure 4. In Figure 4, different power modules PM are connected through nodes B1 and B2.

[0057] 3) The power module adopts a three-level topology structure, and the connection diagram of the power module PM and the bidirectional thyristor T is shown in Figure 5. In Figure 5, different power modules PM are connected through nodes B1 and B2.

[0058] Optionally, as shown in FIG6 , the bidirectional thyristor T includes a stacked anode-side housing T11, a first molybdenum sheet layer T12, a chip layer T13, a second molybdenum sheet layer T14, and a cathode-side housing T15. The specific structure of the chip layer T13 can be designed based on the operating principle of the bidirectional thyristor T and will not be described in detail in this embodiment.

[0059] Furthermore, the bidirectional thyristor further includes a first metal layer and / or a second metal layer. The embodiment of the present application is described by taking the bidirectional thyristor further including the first metal layer and the second metal layer as an example.

[0060] As shown in Figure 6, the first metal layer T16 is stacked between the anode-side housing T11 and the first molybdenum sheet T12, and the second metal layer T17 is stacked between the cathode-side housing T15 and the second molybdenum sheet T14.

[0061] The first metal layer T16 and the second metal layer T17 are made of metal with high resistivity. When the current flowing through the bidirectional thyristor T is large, the large amount of heat generated by the first metal layer T16 and the second metal layer T17 can quickly damage the bidirectional thyristor T to achieve a short circuit of the bidirectional thyristor T, while reducing the heat dissipation of the external resistor.

[0062] As shown in Figure 7, the trigger circuit 10 may include a first trigger module 1 and a transmission module TR. The input end of the first trigger module 1 is connected to the power module PM, the output end of the first trigger module 1 is connected to the input end of the transmission module TR, and the output end of the transmission module TR is connected to the bidirectional thyristor T.

[0063] The first trigger module 1 is used to output a first pulse signal according to a driving signal from the power module PM.

[0064] The transmission module TR is used to transmit the first pulse signal to the bidirectional thyristor T, so that the bidirectional thyristor T is short-circuited or bidirectionally conductive, thereby bypassing the power module PM.

[0065] In the event of a failure in the control system of the power module, there is the possibility that the sub-module capacitor of the mF level inside the power module is directly short-circuited during the power module bypass process. The short-circuit discharge of the sub-module capacitor at the moment the bidirectional thyristor completes the action may generate a current of more than 1000kA, which is easy to damage the power module. Therefore, in the embodiment of the present application, at least one of the amplitude, pulse width and frequency of the first pulse signal for triggering the bidirectional thyristor is increased in sequence. In other words, the first trigger module 1 in the embodiment of the present application can gradually reduce the blocking resistance of the bidirectional thyristor by using a single-group multi-stage triggering method, and finally achieve the short circuit of the bidirectional thyristor T.

[0066] In the single-group multi-stage triggering process, the first pulse signal may be as shown in Figure 8. In Figure 8, the amplitude of the first pulse signal increases sequentially, and the pulse width and frequency are fixed.

[0067] Of course, the amplitude, pulse width, and frequency of the first pulse signal used to trigger the bidirectional thyristor can all be fixed. That is, the first trigger module 1 in the embodiment of the present application can use a single-group triggering method to enable the bidirectional thyristor to continuously conduct in the same direction and achieve bidirectional conduction. During the single-group triggering process, the first pulse signal can be as shown in Figure 9.

[0068] In some embodiments, as shown in FIG10 , the first trigger module 1 includes a switch tube S1 , a first resistor R1 , and a first capacitor C1 .

[0069] The control electrode of the switch tube S1 is used to connect to the power module PM, the first electrode of the switch tube S1 (which can be a drain) is connected to the first end of the first resistor R1, the second electrode of the switch tube S1 (which can be a source) is connected to the first end of the first capacitor C1, and the second ends of the first resistor R1 and the first capacitor C1 are respectively connected to the transmission module TR (which can be the first primary winding of the transmission module TR).

[0070] 10 , the first trigger module 1 further includes an acquisition module AD. A first input terminal of the acquisition module AD is connected to the second terminal of the first resistor R1 , a second input terminal of the acquisition module AD is connected to the second terminal of the first capacitor C1 , and an output terminal of the acquisition module AD is connected to the power module PM.

[0071] The acquisition module AD is used to obtain a first pulse signal, convert the first pulse signal into a digital signal and output it to the power module PM.

[0072] The power module PM is used to control the output of the driving signal according to the digital signal. In other words, the first pulse signal is fed back through the acquisition module, and the driving signal is then controlled through the first pulse signal.

[0073] In some other embodiments, the trigger circuit 10 further includes a second trigger module 2. The first input terminal and the second input terminal of the second trigger module 2 are both connected to the submodule capacitor C in the power module PM. SM The first output terminal and the second output terminal of the second trigger module 2 are both connected to the transmission module TR.

[0074] The second trigger module 2 is used to: SM The voltage outputs a second pulse signal to the transmission module TR.

[0075] The transmission module TR is further configured to transmit the second pulse signal to the bidirectional thyristor T to short-circuit the bidirectional thyristor T.

[0076] 10 , the trigger circuit 10 further includes a second trigger module 2. The second trigger module 2 includes a second capacitor C2, a second capacitor C3, a second resistor R2, a third resistor R3, a fourth resistor R4 and a first breakdown diode BOD1.

[0077] The first ends of the second capacitor C2 and the second resistor R2 are connected to each other, serving as the first input end of the second trigger module 2. The first ends of the second capacitor C3 and the third resistor R3 are connected to each other, serving as the second input end and the second output end of the second trigger module. The second ends of the second capacitor C2, the second capacitor C3, the second resistor R2, and the third resistor R3 are connected to each other and to the anode of the first breakdown diode BOD1. The cathode of the first breakdown diode BOD1 is connected to the first end of the fourth resistor R4. The second end of the fourth resistor R4 serves as the first output end of the second trigger module 2.

[0078] In the event of a failure in the control system of the power module PM or the first trigger module 1 , the capacitors C2 and C3 in the second trigger module 2 are charged, and the second pulse signal is output through the breakdown diode BOD1 , thereby short-circuiting the bidirectional thyristor.

[0079] Exemplarily, as shown in FIG10 , the trigger circuit 10 further includes a third trigger module 3 and a fourth trigger module 4 .

[0080] The first input end of each of the third trigger module 3 and the fourth trigger module 4 is connected to the transmission module TR, the second input end of the third trigger module 3 is connected to the second electrode of the bidirectional thyristor T, and the second input end of the fourth trigger module 4 is connected to the first electrode of the bidirectional thyristor T. The output end of the third trigger module 3 is connected to the first control electrode of the bidirectional thyristor T, and the output end of the fourth trigger module 4 is connected to the second control electrode of the bidirectional thyristor 4.

[0081] The third trigger module 3 is used to output a third pulse signal to the bidirectional thyristor T according to the voltage between the second electrode and the first control electrode of the bidirectional thyristor T to cause the bidirectional thyristor T to be unidirectionally short-circuited.

[0082] The fourth trigger module 4 is used for outputting a fourth pulse signal to the bidirectional thyristor T according to the voltage between the first electrode and the second control electrode of the bidirectional thyristor T to cause the bidirectional thyristor T to be unidirectionally short-circuited.

[0083] It is conceivable that the third pulse signal and the fourth pulse signal can cause the bidirectional thyristor T to short-circuit in both directions, thereby bypassing the power module PM.

[0084] Optionally, as shown in FIG10 , the third trigger module 3 includes a fifth resistor R5 , a sixth resistor R6 and a second breakdown diode BOD2 .

[0085] The first end of the fifth resistor R5 serves as the first input of the third trigger module 3. The second end of the fifth resistor R5 is connected to the first end of the sixth resistor R6, serving as the output of the third trigger module 3 and connected to the first control electrode of the bidirectional thyristor T via node E_A3. The second end of the sixth resistor R6 is connected to the cathode of the second breakdown diode BOD2. The anode of the second breakdown diode BOD2 serves as the second input of the third trigger module 3 and is connected to the second electrode of the bidirectional thyristor T via node E_A2.

[0086] Similarly, the fourth trigger module 4 includes a seventh resistor R7, an eighth resistor R8 and a third breakdown diode BOD3.

[0087] A first end of the seventh resistor R7 serves as a first input end of the fourth trigger module 4. A second end of the seventh resistor R7 is connected to a first end of an eighth resistor R8, serving as an output end of the fourth trigger module 4 and connected to a second control electrode of the bidirectional thyristor T via a node E_A4. A second end of the eighth resistor R8 is connected to a cathode of a third breakdown diode BOD3. An anode of the third breakdown diode BOD3 serves as a second input end of the fourth trigger module 4 and is connected to a first electrode of the bidirectional thyristor T via a node E_A1.

[0088] When the control system of the power module PM fails and the voltage of the capacitor C2 and the capacitor C3 in the second trigger module 2 cannot short-circuit the bidirectional thyristor, the third trigger module 3 and the fourth trigger module 4 can achieve bidirectional short-circuiting of the bidirectional thyristor.

[0089] Optionally, referring to FIG. 10 , the transmission module TR includes a first primary winding TR11 , a second primary winding TR12 , a first secondary winding TR21 , and a second secondary winding TR22 .

[0090] A first end of the first primary winding TR11 is connected to the second end of the first resistor R1, and a second end of the first primary winding TR11 is connected to the second end of the first capacitor C1. A first end of the second primary winding TR12 is connected to the first output end of the second trigger module 2, and a second end of the second primary winding TR12 is connected to the second output end of the second trigger module 2. A first end of the first secondary winding TR21 is connected to the first input end of the third trigger module 3, and a second end of the first secondary winding TR21 is connected to the first electrode of the bidirectional thyristor T via node E_A1. A first end of the second secondary winding TR22 is connected to the first input end of the fourth trigger module 4, and a second end of the second secondary winding TR22 is connected to the second electrode of the bidirectional thyristor T via node E_A2.

[0091] The present application also provides a power electronic device, comprising a power module, a unidirectional thyristor, and a trigger circuit. The trigger circuit is connected to the unidirectional thyristor, and the trigger circuit is also connected to the power module.

[0092] Optionally, the power electronic device may be a modular multilevel converter (MMC), a static var generator (SVG), or the like.

[0093] The above are merely embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention are included in the scope of the claims of the present invention to be approved.

Claims

1. A trigger circuit for a bidirectional thyristor, for bypassing a power module by controlling the bidirectional thyristor; characterized in that: The trigger circuit includes a first trigger module and a transmission module; The first trigger module is connected to the power module, the first trigger module is also connected to the transmission module, and the transmission module is connected to the bidirectional thyristor; The first trigger module is used to: output a first pulse signal according to the driving signal from the power module; The transmission module is used to transmit the first pulse signal to the bidirectional thyristor to short-circuit or bidirectionally conduct the bidirectional thyristor.

2. The trigger circuit according to claim 1, wherein: The first trigger module includes a switch tube, a first resistor and a first capacitor; The control electrode of the switching tube is used to connect to the power module, the first electrode of the switching tube is connected to the first end of the first resistor, the second electrode of the switching tube is connected to the first end of the first capacitor, and the second ends of the first resistor and the first capacitor are respectively connected to the transmission module.

3. The trigger circuit according to claim 2, wherein: The first trigger module further includes an acquisition module, wherein a first input end of the acquisition module is connected to the second end of the first resistor, a second input end of the acquisition module is connected to the second end of the first capacitor, and an output end of the acquisition module is connected to the power module; The acquisition module is used to: acquire the first pulse signal, and convert the first pulse signal into a digital signal and output it to the power module; The power module is used to control the output of the driving signal according to the digital signal.

4. The trigger circuit according to any one of claims 1 to 3, characterized in that: The amplitude, pulse width and frequency of the first pulse signal are all fixed; or at least one of the amplitude, pulse width and frequency of the first pulse signal increases sequentially.

5. The trigger circuit according to claim 2 or 3, characterized in that: The trigger circuit further includes a second trigger module; the first input terminal and the second input terminal of the second trigger module are both connected to the submodule capacitor in the power module, and the first output terminal and the second output terminal of the second trigger module are both connected to the transmission module; The second trigger module is used to: output a second pulse signal to the transmission module according to the voltage of the sub-module capacitor; The transmission module is further configured to transmit the second pulse signal to the bidirectional thyristor to short-circuit the bidirectional thyristor.

6. The trigger circuit according to claim 5, characterized in that: The second trigger module includes a second capacitor, a third capacitor, a second resistor, a third resistor, a fourth resistor and a first breakdown diode; The first ends of the second capacitor and the second resistor are respectively connected, serving as the first input end of the second trigger module; the first ends of the third capacitor and the third resistor are respectively connected, serving as the second input end and the second output end of the second trigger module; the second ends of the second capacitor, the third capacitor, the second resistor and the third resistor are respectively connected, and connected to the anode of the first breakdown diode, the cathode of the first breakdown diode is connected to the first end of the fourth resistor, and the second end of the fourth resistor serves as the first output end of the second trigger module.

7. The trigger circuit according to claim 6, characterized in that: The trigger circuit further includes a third trigger module and a fourth trigger module; Wherein, the first input end of each of the third trigger module and the fourth trigger module is connected to the transmission module, the second input end of the third trigger module is connected to the second electrode of the bidirectional thyristor, and the second input end of the fourth trigger module is connected to the first electrode of the bidirectional thyristor; the output end of the third trigger module is connected to the first control electrode of the bidirectional thyristor, and the output end of the fourth trigger module is connected to the second control electrode of the bidirectional thyristor; The third trigger module is used to: output a third pulse signal to the bidirectional thyristor according to the voltage between the second electrode and the first control electrode of the bidirectional thyristor to cause the bidirectional diode to be unidirectionally short-circuited; The fourth trigger module is used to output a fourth pulse signal to the bidirectional thyristor according to the voltage between the first electrode and the second control electrode of the bidirectional thyristor to cause the bidirectional diode to be unidirectionally short-circuited.

8. The trigger circuit according to claim 7, wherein: The third trigger module includes a fifth resistor, a sixth resistor and a second breakdown diode; The first end of the fifth resistor serves as the first input end of the third trigger module; the second end of the fifth resistor is connected to the first end of the sixth resistor, serving as the output end of the third trigger module; the second end of the sixth resistor is connected to the cathode of the second breakdown diode; the anode of the second breakdown diode serves as the second input end of the third trigger module, and is connected to the second pole of the bidirectional thyristor.

9. The trigger circuit according to claim 7 or 8, characterized in that: The fourth trigger module includes a seventh resistor, an eighth resistor and a third breakdown diode; The first end of the seventh resistor serves as the first input end of the fourth trigger module, and the second end of the seventh resistor is connected to the first end of the eighth resistor, serving as the output end of the fourth trigger module; the second end of the eighth resistor is connected to the cathode of the third breakdown diode; the anode of the third breakdown diode serves as the second input end of the fourth trigger module, and is connected to the first pole of the bidirectional thyristor.

10. The trigger circuit according to any one of claims 7 to 9, characterized in that: The transmission module includes a first primary winding, a second primary winding, a first secondary winding and a second secondary winding; The first end of the first primary winding is connected to the second end of the first resistor, and the second end of the first primary winding is connected to the second end of the first capacitor; the first end of the second primary winding is connected to the first output end of the second trigger module, and the second end of the second primary winding is connected to the second output end of the second trigger module; the first end of the first secondary winding is connected to the first input end of the third trigger module, and the second end of the first secondary winding is connected to the first pole of the bidirectional thyristor; the first end of the second secondary winding is connected to the first input end of the fourth trigger module, and the second end of the second secondary winding is connected to the second pole of the bidirectional thyristor.

11. The trigger circuit according to any one of claims 1 to 10, characterized in that: The bidirectional thyristor comprises an anode side shell, a first molybdenum sheet layer, a chip layer, a second molybdenum sheet layer and a cathode side shell which are stacked; The bidirectional thyristor further includes a first metal layer and / or a second metal layer, wherein the first metal layer is stacked between the anode side housing and the first molybdenum sheet layer, and the second metal layer is stacked between the cathode side housing and the second molybdenum sheet layer.

12. A power electronic device, characterized in that: The invention comprises a power module, a bidirectional thyristor and a trigger circuit according to any one of claims 1 to 11; the trigger circuit is connected to the bidirectional thyristor, and the trigger circuit is also connected to the power module.

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