A trigger circuit and power electronic device for a unidirectional thyristor

Abstract

The application provides a trigger circuit and a power electronic device for a unidirectional thyristor. The trigger circuit comprises a first trigger module and a transmission module. The first trigger module is used for outputting a first pulse signal according to a driving signal from a power module, and the transmission module is used for transmitting the first pulse signal to the unidirectional thyristor to short-circuit the unidirectional thyristor. The first driving signal can be transmitted to the unidirectional thyristor in time through the transmission module, and the power module is bypassed by controlling the short-circuit of the unidirectional thyristor. The application can quickly control the short-circuit of the unidirectional thyristor and ensure the safety of the power module. At the same time, the application can avoid the problems of the mechanical structure of the electromagnetic vacuum switch existing in the risk of sticking and refusing to move and the poor closing reliability caused by the impact current, and can also avoid the problems of the gas expansion type one-off switch existing in the long action time and poor maintenance convenience.

Description

Technical Field

[0001] This application relates to the field of power electronics, specifically to a trigger circuit and power electronic device for a unidirectional thyristor. Background Technology

[0002] Power modules in power electronic devices such as modular multilevel converters (MMCs) and static var generators (SVGs) are typically cascaded. When a power module fails, to ensure the availability of the power electronic device, related technologies often use mechanical switches, such as electromagnetic vacuum switches or gas expansion one-time switches, to disconnect the faulty power module from the device. However, electromagnetic vacuum switches have long operating times, their mechanical structure poses a risk of jamming and failure to operate, and inrush currents can lead to poor closing reliability. Gas expansion one-time switches also have long operating times and poor maintenance convenience. Summary of the Invention

[0003] To address the issues of long operating times in existing mechanical switches, this application provides a trigger circuit for a unidirectional thyristor, used to bypass a power module by controlling the unidirectional thyristor. The trigger circuit may include a first trigger module and a transmission module. The first trigger module is connected to the power module and also to the transmission module, which in turn is connected to the unidirectional thyristor.

[0004] The first trigger module is used to output a first pulse signal based on the drive signal from the power module.

[0005] The transmission module is used to transmit the first pulse signal to the unidirectional thyristor to short-circuit the unidirectional thyristor.

[0006] In some possible implementations, the first trigger module includes a switching transistor, a first resistor, and a first capacitor;

[0007] The control terminal of the switching transistor is used to connect to the power module. The first terminal of the switching transistor is connected to the first end of the first resistor, and the second terminal of the switching transistor is connected to the first end of the first capacitor. The second terminals of the first resistor and the first capacitor are both connected to the transmission module.

[0008] Furthermore, the first trigger module also includes a data acquisition module. The first input terminal of the data acquisition module is connected to the second terminal of the first resistor, the second input terminal of the data acquisition module is connected to the second terminal of the first capacitor, and the output terminal of the data acquisition module is connected to the power module.

[0009] The acquisition module is used to: acquire the first pulse signal and convert the first pulse signal into a digital signal for output to the power module.

[0010] The power module is used to control the output of drive signals based on digital signals.

[0011] For example, at least one of the amplitude, pulse width, and frequency of the first pulse signal increases sequentially.

[0012] In some other possible implementations, the trigger circuit also includes a second trigger module; the first and second input terminals of the second trigger module are both connected to the submodule capacitor in the power module, and the first and second output terminals of the second trigger module are both connected to the transmission module.

[0013] The second trigger module is used to output a second pulse signal to the transmission module based on the voltage of the submodule capacitor.

[0014] The transmission module is also used to: transmit the second pulse signal to the unidirectional thyristor to short-circuit the unidirectional thyristor.

[0015] Furthermore, 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.

[0016] The first ends of the second capacitor and the second resistor are connected to each other, serving as the first input terminal 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 terminal and the second output terminal 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 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 terminal of the second trigger module.

[0017] In some possible implementations, the trigger circuit also includes a third trigger module. The first input terminal of the third trigger module is connected to the transmission module, the second input terminal of the third trigger module is connected to the anode of the unidirectional thyristor, and the output terminal of the third trigger module is connected to the control electrode of the unidirectional thyristor.

[0018] The third trigger module is used to output a third pulse signal to the unidirectional thyristor based on the voltage between the anode and the control electrode of the unidirectional thyristor, causing the unidirectional thyristor to short-circuit.

[0019] Furthermore, the third trigger module includes a fifth resistor, a sixth resistor, and a second breakdown diode.

[0020] The first end of the fifth resistor serves as the first input terminal 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 terminal 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 terminal of the third trigger module, and is connected to the anode of the unidirectional thyristor.

[0021] Optionally, the transmission module includes a first primary winding, a second primary winding, and a secondary winding.

[0022] 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 terminal of the second trigger module, and the second end of the second primary winding is connected to the second output terminal of the second trigger module; the first end of the secondary winding is connected to the first input terminal of the third trigger module, and the second end of the secondary winding is connected to the cathode of the unidirectional thyristor.

[0023] Optionally, the unidirectional thyristor includes a stacked anode-side housing, a first molybdenum sheet layer, a chip layer, a second molybdenum sheet layer, and a cathode-side housing.

[0024] The unidirectional 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.

[0025] Furthermore, this application also provides a power electronic device, including a power module, a unidirectional thyristor, and the aforementioned trigger circuit. The trigger circuit is connected to the unidirectional thyristor and is also connected to the power module.

[0026] Optionally, the power electronic device can be a modular multilevel converter (MMC), a static var generator (SVG), etc.

[0027] Compared with the prior art, the beneficial effects of this application are as follows:

[0028] The triggering circuit for a unidirectional thyristor provided in this application includes a first triggering module and a transmission module. The first triggering module outputs a first pulse signal based on a drive signal from a power module, and the transmission module transmits the first pulse signal to the unidirectional thyristor to short-circuit it. The first drive signal can be transmitted to the unidirectional thyristor in a timely manner through the transmission module, and the power module is bypassed by controlling the short circuit of the unidirectional thyristor. Compared with mechanical switches, this application can quickly control the short circuit of the unidirectional thyristor, ensuring the safety of the power module. At the same time, it avoids the risks of jamming and failure to operate due to the mechanical structure of electromagnetic vacuum switches and the problems of poor closing reliability caused by inrush current. It also avoids the problems of long operating time and poor maintenance convenience of gas expansion one-time switches.

[0029] The amplitude, pulse width, and frequency of the first pulse signal used to trigger the unidirectional thyristor in this application increase sequentially. In other words, a single-group multi-stage triggering method can be used to gradually reduce the blocking resistance of the unidirectional thyristor, ultimately achieving a short circuit of the unidirectional thyristor.

[0030] The unidirectional thyristor in this application has a first metal layer and / or a second metal layer. The first metal layer and / or the second metal layer are made of metals with high resistivity. When the current flowing through the unidirectional thyristor is large, the large amount of heat generated through the first and second metal layers can quickly damage the unidirectional thyristor, achieving a short circuit, while reducing the heat dissipation of the external resistor. Furthermore, the unidirectional thyristor in this application can reduce the short-circuit current of the unidirectional thyristor by more than half, thereby reducing the difficulty of explosion-proof design for the power module.

[0031] In this 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 according to the digital signal. In other words, this application can realize the feedback of the first pulse signal through the acquisition module, and then realize the control of the drive signal through the first pulse signal. Attached Figure Description

[0032] To more clearly illustrate the technical solutions in this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0033] Figure 1a This is a schematic diagram showing the connection between a single unidirectional thyristor and a single power module in an embodiment of this application;

[0034] Figure 1b This is a schematic diagram showing the connection between a single unidirectional thyristor and a single power module in an embodiment of this application;

[0035] Figure 2a This is a schematic diagram showing the connection between multiple unidirectional thyristors and multiple power modules in an embodiment of this application;

[0036] Figure 2b This is a schematic diagram showing the connection between multiple unidirectional thyristors and multiple power modules in an embodiment of this application;

[0037] Figure 3a This is a schematic diagram showing the connection between a unidirectional thyristor and a power module employing a half-bridge topology in an embodiment of this application.

[0038] Figure 3b This is a schematic diagram showing the connection between a unidirectional thyristor and a power module employing a half-bridge topology in an embodiment of this application.

[0039] Figure 4a This is a schematic diagram showing the connection between a unidirectional thyristor and a power module employing a full-bridge topology in an embodiment of this application.

[0040] Figure 4b This is a schematic diagram showing the connection between a unidirectional thyristor and a power module employing a full-bridge topology in an embodiment of this application.

[0041] Figure 5a This is a schematic diagram showing the connection between a unidirectional thyristor and a power module employing a three-level topology in an embodiment of this application.

[0042] Figure 5b This is a schematic diagram showing the connection between a unidirectional thyristor and a power module employing a three-level topology in an embodiment of this application.

[0043] Figure 6 This is a schematic diagram of the structure of the unidirectional thyristor in the embodiments of this application;

[0044] Figure 7 This is a schematic diagram of the trigger circuit in an embodiment of this application;

[0045] Figure 8 This is a schematic waveform diagram of the first pulse signal in an embodiment of this application;

[0046] Figure 9 This is a schematic diagram of the trigger circuit in an embodiment of this application. Detailed Implementation

[0047] The technical solutions in this application will now be described with reference to the accompanying drawings.

[0048] The terms "first," "second," etc., used in the specification, embodiments, claims, and drawings of this application are for distinguishing purposes only and should not be construed as indicating or implying relative importance or order. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion, such as including 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 these processes, methods, products, or apparatuses.

[0049] It should be understood that in this application, "at least one (item)" means one or more, and "more than" means two or more. "And / or" is used to describe the relationship between related objects, indicating that three relationships can exist. For example, "A and / or B" can represent three cases: only A exists, only B exists, and both A and B exist simultaneously, where A and B can be singular or plural. The character " / " generally indicates that the preceding and following related objects are in an "or" relationship. "At least one (item) of the following" or similar expressions refer to any combination of these items, including any combination of single or plural items. For example, at least one (item) of a, b, or c can represent: a, b, c, "a and b", "a and c", "b and c", or "a and b and c", where a, b, and c can be single or multiple.

[0050] This application provides a trigger circuit for a unidirectional thyristor, used to bypass a power module (PM) by controlling the unidirectional thyristor to short-circuit. For example... Figure 1a and Figure 1b As shown, the cathode of the unidirectional thyristor T can be connected to the power module PM via node E_A1, and the anode of the unidirectional thyristor T can be connected to the power module PM via node E_A2. Different power modules PM are connected via nodes B1 and B2. The power module PM may include a submodule SM and a submodule capacitor C. SM .

[0051] In the case of cascading n (n ≥ 2) power modules, the n power modules and n unidirectional thyristors are connected in a one-to-one correspondence, such as... Figure 2a and Figure 2b As shown. Figure 2a and Figure 2b In this system, different power modules (PM) are connected through nodes B1 and B2.

[0052] The power module can adopt topologies such as half-bridge, full-bridge, and three-level. Details are as follows:

[0053] 1) The power module adopts a half-bridge topology. The connection diagram between the power module PM and the unidirectional thyristor T is shown in the figure. Figure 3a and Figure 3b As shown. Figure 3a and Figure 3b In this system, different power modules (PM) are connected through nodes B1 and B2.

[0054] 2) The power module adopts a full-bridge topology. The connection diagram between the power module PM and the unidirectional thyristor T is shown in the figure. Figure 4a and Figure 4b As shown. Figure 4a and Figure 4bIn this system, different power modules (PM) are connected through nodes B1 and B2.

[0055] 3) The power module adopts a three-level topology. The connection diagram between the power module PM and the unidirectional thyristor T is shown in the figure. Figure 5a and Figure 5b As shown. Figure 5a and Figure 5b In this system, different power modules (PM) are connected through nodes B1 and B2.

[0056] Optional, such as Figure 6 As shown, the unidirectional 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 according to the working principle of the unidirectional thyristor T, and will not be described in detail in the embodiments of this application.

[0057] Furthermore, the unidirectional thyristor also includes a first metal layer and / or a second metal layer. This application embodiment uses an example where the unidirectional thyristor further includes a first metal layer and a second metal layer for illustration.

[0058] like Figure 6 As shown, a first metal layer T16 is stacked between the anode-side outer shell T11 and the first molybdenum sheet layer T12. A second metal layer T17 is stacked between the cathode-side outer shell T15 and the second molybdenum sheet layer T14.

[0059] The first metal layer T16 and the second metal layer T17 are made of metals with high resistivity. When the current flowing through the unidirectional 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 unidirectional thyristor T and achieve a short circuit in the unidirectional thyristor T, while reducing the heat dissipation of the external resistor.

[0060] like Figure 7 As shown, the trigger circuit 10 may include a first trigger module 1 and a transmission module TR. The input terminal of the first trigger module 1 is connected to the power module, the output terminal of the first trigger module 1 is connected to the input terminal of the transmission module TR, and the output terminal of the transmission module TR is connected to the unidirectional thyristor T.

[0061] The first trigger module 1 is used to output a first pulse signal according to the drive signal from the power module PM.

[0062] The transmission module TR is used to transmit the first pulse signal to the unidirectional thyristor T, causing the unidirectional thyristor T to be short-circuited, thereby bypassing the power module PM.

[0063] In the event of a malfunction in the power module's control system, there is a possibility that the internal mF-level submodule capacitors of the power module may be directly short-circuited during the power module bypass process. The short-circuit discharge of the submodule capacitors at the moment the unidirectional thyristor completes its operation can generate a current exceeding 1000kA, which can easily damage the power module. Therefore, in this embodiment, at least one of the amplitude, pulse width, and frequency of the first pulse signal used to trigger the unidirectional thyristor increases sequentially. That is, in this embodiment, the first trigger module 1 can use a single-group multi-stage triggering method to gradually decrease the blocking resistance of the unidirectional thyristor, ultimately achieving a short circuit in the unidirectional thyristor T.

[0064] In a single-group multi-level triggering process, the first pulse signal can be as follows: Figure 8 As shown. Figure 8 In the process, the amplitude of the first pulse signal increases sequentially, while the pulse width and frequency remain fixed.

[0065] In some embodiments, such as Figure 9 As shown, the first trigger module 1 includes a switch S, a first resistor R1, and a first capacitor C1.

[0066] The control terminal of the switching transistor S is used to connect to the power module PM. The first terminal (which can be the drain) of the switching transistor S is connected to the first end of the first resistor R1. The second terminal (which can be the source) of the switching transistor S is connected to the first end of the first capacitor C1. The second terminals of the first resistor R1 and the first capacitor C1 are both connected to the transmission module TR (which can be the first primary winding of the transmission module TR).

[0067] Further, refer to Figure 9 The first trigger module 1 also includes a data acquisition module AD. The first input terminal of the data acquisition module AD is connected to the second terminal of the first resistor R1, the second input terminal of the data acquisition module AD is connected to the second terminal of the first capacitor C1, and the output terminal of the data acquisition module AD is connected to the power module PM.

[0068] The acquisition module AD is used to: acquire the first pulse signal and convert the first pulse signal into a digital signal to be output to the power module PM.

[0069] The power module PM is used to control the output of the drive signal based on the digital signal. In other words, the acquisition module provides feedback on the first pulse signal, which is then used to control the drive signal.

[0070] In other embodiments, the trigger circuit 10 further includes a second trigger module 2. The first and second input terminals of the second trigger module 2 are both connected to the submodule capacitor C in the power module PM. SM The first and second output terminals of the second trigger module 2 are both connected to the transmission module TR.

[0071] The second trigger module 2 is used to: determine the capacitance C of the submodule SM The voltage output second pulse signal is sent to the transmission module TR.

[0072] The transmission module TR is also used to: transmit the second pulse signal to the unidirectional thyristor T to short-circuit the unidirectional thyristor T.

[0073] Further, refer to Figure 9 The trigger circuit 10 also 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.

[0074] The first terminals of the second capacitor C2 and the second resistor R2 are connected to each other, serving as the first input terminal of the second trigger module 2. The first terminals of the second capacitor C3 and the third resistor R3 are connected to each other, serving as the second input terminal and the second output terminal of the second trigger module. The second terminals of the second capacitor C2, the second capacitor C3, the second resistor R2, and the third resistor R3 are connected and connected to the anode of the first breakdown diode BOD1. The cathode of the first breakdown diode BOD1 is connected to the first terminal of the fourth resistor R4, and the second terminal of the fourth resistor R4 serves as the first output terminal of the second trigger module 2.

[0075] 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 by breaking down the diode BOD1, thereby causing the unidirectional thyristor to short-circuit.

[0076] Among the other possible implementations, continue to refer to Figure 9 The trigger circuit 10 also includes a third trigger module 3. The first input terminal of the third trigger module 3 is connected to the transmission module TR, the second input terminal of the third trigger module 3 is connected to the anode of the unidirectional thyristor T, and the output terminal of the third trigger module 3 is connected to the control electrode of the unidirectional thyristor T.

[0077] The third trigger module 3 is used to output a third pulse signal to the unidirectional thyristor T based on the voltage between the anode and the control electrode of the unidirectional thyristor T, causing the unidirectional thyristor T to short-circuit.

[0078] Furthermore, such as Figure 9 As shown, the third trigger module 3 includes a fifth resistor R5, a sixth resistor R6, and a second breakdown diode BOD2.

[0079] The first terminal of the fifth resistor R5 serves as the first input terminal of the third trigger module 3. The second terminal of the fifth resistor R5 is connected to the first terminal of the sixth resistor R6, serving as the output terminal of the third trigger module 3. The second terminal 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 terminal of the third trigger module 3, and is connected to the anode of the unidirectional thyristor T.

[0080] When the control system of the power module fails and the voltage of capacitors C2 and C3 in the second trigger module 2 cannot short-circuit the unidirectional thyristor, the unidirectional thyristor can be short-circuited through the third trigger module.

[0081] Optional, see reference Figure 9 The transmission module TR includes a first primary winding TR11, a second primary winding TR12, and a secondary winding TR21.

[0082] The first terminal of the first primary winding TR11 is connected to the second terminal of the first resistor R1, and the second terminal of the first primary winding TR11 is connected to the second terminal of the first capacitor C1. The first terminal of the second primary winding TR12 is connected to the first output terminal of the second trigger module 2, and the second terminal of the second primary winding TR12 is connected to the second output terminal of the second trigger module 2. The first terminal of the secondary winding TR21 is connected to the first input terminal of the third trigger module 3, and the second terminal of the secondary winding TR21 is connected to the cathode of the unidirectional thyristor T.

[0083] This application also provides a power electronic device, including a power module, a unidirectional thyristor, and a trigger circuit. The trigger circuit is connected to the unidirectional thyristor and also to the power module.

[0084] Optionally, the power electronic device can be a modular multilevel converter (MMC), a static var generator (SVG), etc.

[0085] 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 within the scope of the claims of the present invention pending approval.

Claims

1. A trigger circuit for a unidirectional thyristor for bypassing a power module by controlling the unidirectional thyristor; characterized in that, The trigger circuit comprises a first trigger module and a transmission module; The first trigger module is connected with the power module, and is also connected with the transmission module, and the transmission module is connected with the unidirectional thyristor; The first trigger module is configured to output a first pulse signal according to a driving signal from the power module; The transmission module is configured to transmit the first pulse signal to the unidirectional thyristor to short-circuit the unidirectional thyristor; The first trigger module comprises a switch tube, a first resistor and a first capacitor; The control electrode of the switch tube is configured to be connected with the power module, the first electrode of the switch tube is connected with the first end of the first resistor, the second electrode of the switch tube is connected with the first end of the first capacitor, and the second ends of the first resistor and the first capacitor are connected with the transmission module; The trigger circuit further comprises a second trigger module, the first input end and the second input end of the second trigger module are connected with a sub-module capacitor in the power module, and the first output end and the second output end of the second trigger module are connected with the transmission module; The second trigger module is configured 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 unidirectional thyristor to short-circuit the unidirectional thyristor; The trigger circuit further comprises a third trigger module, the first input end of the third trigger module is connected with the transmission module, the second input end of the third trigger module is connected with the anode of the unidirectional thyristor, and the output end of the third trigger module is connected with the control electrode of the unidirectional thyristor; The third trigger module is configured to output a third pulse signal to the unidirectional thyristor to short-circuit the unidirectional thyristor according to the voltage between the anode and the control electrode of the unidirectional thyristor; The transmission module comprises a first primary winding, a second primary winding and a secondary winding; The first end of the first primary winding is connected with the second end of the first resistor, the second end of the first primary winding is connected with the second end of the first capacitor, the first end of the second primary winding is connected with the first output end of the second trigger module, the second end of the second primary winding is connected with the second output end of the second trigger module, the first end of the secondary winding is connected with the first input end of the third trigger module, and the second end of the secondary winding is connected with the cathode of the unidirectional thyristor.

2. The trigger circuit of claim 1, wherein The first trigger module further comprises an acquisition module, the first input end of the acquisition module is connected with the second end of the first resistor, the second input end of the acquisition module is connected with the second end of the first capacitor, and the output end of the acquisition module is connected with the power module; The acquisition module is configured to acquire the first pulse signal, and convert the first pulse signal into a digital signal and output the digital signal to the power module; The power module is configured to control the output of the driving signal according to the digital signal.

3. The trigger circuit of claim 1, wherein, At least one of the amplitude, the pulse width and the frequency of the first pulse signal increases in turn.

4. The trigger circuit of claim 1, wherein, The second trigger module comprises a second capacitor, a third capacitor, a second resistor, a third resistor, a fourth resistor and a first breakdown diode; The first end of the second capacitor and the second resistor is connected, as the first input end of the second trigger module; the first end of the third capacitor and the third resistor is connected, as the second input end and the second output end of the second trigger module; the second end of the second capacitor, the third capacitor, the second resistor and the third resistor is connected, and the anode of the first breakdown diode is connected; the cathode of the first breakdown diode is connected with the first end of the fourth resistor, and the second end of the fourth resistor is as the first output end of the second trigger module.

5. The trigger circuit of claim 1, wherein, The third trigger module comprises a fifth resistor, a sixth resistor and a second breakdown diode; The first end of the fifth resistor is as the first input end of the third trigger module; the second end of the fifth resistor and the first end of the sixth resistor is connected, as the output end of the third trigger module; the second end of the sixth resistor is connected with the cathode of the second breakdown diode; the anode of the second breakdown diode is as the second input end of the third trigger module, and is connected with the anode of the unidirectional thyristor.

6. The trigger circuit of claim 1, wherein, The unidirectional 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 unidirectional thyristor further comprises a first metal layer and / or a second metal layer, the first metal layer is stacked between the anode side shell and the first molybdenum sheet layer, and the second metal layer is stacked between the cathode side shell and the second molybdenum sheet layer.

7. A power electronic device, characterized by The power module, the unidirectional thyristor and the trigger circuit as claimed in any one of claims 1 to 6 are comprised; the trigger circuit is connected with the unidirectional thyristor, and the trigger circuit is further connected with the power module.

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