Trigger controller, trigger control method and converter valve

Abstract

This application provides a trigger controller, a trigger control method, and a converter valve. The trigger controller includes a normal trigger unit for receiving trigger pulses from an upper-level control unit and determining whether the positive voltage and energy extraction voltage of the converter valve reach thresholds, and outputting a signal; a protective trigger unit for determining whether the positive overvoltage reaches a threshold based on the rate of rise of the positive voltage, and outputting a signal; a reverse recovery period protection trigger unit for determining whether the positive voltage and the negative voltage of the converter valve reach thresholds, and outputting a signal; a feedback unit for receiving feedback output signals from the positive trigger unit, the protective trigger unit, and the reverse recovery period protection trigger unit, and outputting a feedback pulse; and a trigger output unit for receiving output signals from the positive trigger unit, the protective trigger unit, and the reverse recovery period protection trigger unit, and outputting a gate trigger pulse to trigger a semiconductor device when any output signal is received.

Description

Technical Field

[0001] This application relates to the field of power electronics technology, and more specifically, to a trigger controller, a trigger control method, and a converter valve. Background Technology

[0002] High-voltage direct current (HVDC) transmission is increasingly widely used both domestically and internationally due to its long transmission distance and large energy capacity. Among them, the HVDC converter valve is a key device for realizing energy conversion, and its triggering control is the core technology of the entire HVDC transmission system.

[0003] Although existing trigger controllers are widely used, they can cause several problems during operation. These problems include: trigger controllers are prone to sending false pulses under conditions of rapid and frequent voltage changes, which can lead to malfunctions of the converter valve; in addition, semiconductor devices have strict requirements for trigger pulse energy, and triggering the converter valve with insufficient energy can easily damage the converter valve.

[0004] The information disclosed in the background section is only intended to enhance the understanding of the background of this application, and therefore may include information that does not constitute prior art known to those skilled in the art. Summary of the Invention

[0005] To address at least one of the aforementioned problems, this application proposes a trigger controller, a trigger control method, and a switching valve.

[0006] According to a first aspect of this application, at least one embodiment of this application provides a trigger controller for a converter valve, comprising: a normal triggering unit, configured to receive a trigger pulse issued by an upper-level control unit, and determine whether the positive voltage of the converter valve reaches a first threshold and whether the energy extraction voltage reaches a second threshold; and outputting a first output signal and a first report output signal when the positive voltage reaches the first threshold and the energy extraction voltage reaches the second threshold; a protective triggering unit, configured to determine whether a positive overvoltage reaches a third threshold based on the rise rate of the positive voltage, and outputting a second output signal and a second report output signal when the energy extraction voltage reaches the second threshold and the positive overvoltage reaches the third threshold; and a reverse recovery period protection triggering unit, configured to determine whether the positive voltage reaches a fourth threshold and whether the negative voltage of the converter valve reaches a third threshold. The fifth threshold, when the energy harvesting voltage reaches the second threshold, and the positive voltage reaches the fourth threshold and the negative voltage reaches the fifth threshold, outputs a third output signal and a third report output signal; the report unit is used to receive the first report output signal sent by the normal trigger unit, the second report output signal sent by the protective trigger unit, and the third report output signal sent by the reverse recovery period protection trigger unit, and outputs a report pulse when any report output signal is received; the trigger output unit is used to receive the first output signal sent by the normal trigger unit, the second output signal sent by the protective trigger unit, and the third output signal sent by the reverse recovery period protection trigger unit, and outputs a gate trigger pulse when any output signal is received to trigger the semiconductor device.

[0007] For example, in some embodiments of this application, the normal triggering unit includes: a first AND gate circuit; a second AND gate circuit connected to the first AND gate circuit, wherein the output signal of the first AND gate circuit serves as the second input signal of the second AND gate circuit, and the output terminal of the second AND gate circuit serves as the output terminal of the normal triggering unit; a trigger pulse photoelectric conversion unit for receiving trigger pulses sent by the upper-level control unit and converting them into output signals; a first diode unit connected to the trigger pulse photoelectric conversion unit, wherein the output signal of the trigger pulse photoelectric conversion unit, after passing through the first diode unit, serves as the first input signal of the second AND gate circuit; and a positive voltage detection and judgment unit connected to the first AND gate circuit for determining whether the positive voltage reaches a first threshold. If the positive voltage reaches the first threshold, the output signal of the positive voltage detection and judgment unit serves as the output signal of the normal triggering unit. The first input signal of the first AND gate circuit is described above; the energy harvesting voltage detection and judgment unit is connected to the first AND gate circuit and is used to determine whether the energy harvesting voltage reaches a second threshold. When the energy harvesting voltage reaches the second threshold, the output signal of the energy harvesting voltage detection and judgment unit is used as the second input signal of the first AND gate circuit; wherein, when the positive pressure detection and judgment unit determines that the positive voltage reaches the first threshold and the energy harvesting voltage detection and judgment unit determines that the energy harvesting voltage reaches the second threshold, the first AND gate circuit outputs the first report output signal; wherein, when the upper-level control unit sends a trigger pulse to the trigger pulse photoelectric conversion unit, the positive pressure detection and judgment unit determines that the positive voltage reaches the first threshold and the energy harvesting voltage detection and judgment unit determines that the energy harvesting voltage reaches the second threshold, the second AND gate circuit outputs the first output signal.

[0008] For example, in some embodiments of this application, the protective triggering unit includes: a protective triggering forward voltage calculation and judgment unit, used to determine whether the forward overvoltage reaches a third threshold based on the rise rate of the forward voltage; a forward overvoltage detection unit, used to detect the forward overvoltage, connected to the protective triggering forward voltage calculation and judgment unit, the output signal of the forward overvoltage detection unit serving as a first input signal of the protective triggering forward voltage calculation and judgment unit; and a protective triggering forward voltage rise rate detection unit, used to detect the rise rate of the forward voltage, connected to the protective triggering forward voltage calculation and judgment unit, the output signal of the protective triggering forward voltage rise rate detection unit serving as the protective triggering forward voltage calculation and judgment unit. The judgment unit has a second input signal; a third AND gate circuit is connected to the protective trigger positive voltage calculation and judgment unit and the energy harvesting voltage detection and judgment unit, respectively. The output signal of the protective trigger positive voltage calculation and judgment unit serves as the first input signal of the third AND gate circuit, the output signal of the energy harvesting voltage detection and judgment unit serves as the second input signal of the third AND gate circuit, and the output terminal of the third AND gate circuit serves as the output terminal of the protective trigger unit. When the energy harvesting voltage detection and judgment unit determines that the energy harvesting voltage reaches the second threshold and the protective trigger positive voltage calculation and judgment unit determines that the positive overvoltage reaches the third threshold, the third AND gate circuit outputs the second output signal and the second report output signal.

[0009] For example, in some embodiments of this application, the reverse recovery period protection trigger unit includes: a fourth AND gate circuit connected to the energy harvesting voltage detection and judgment unit, wherein the output signal of the energy harvesting voltage detection and judgment unit serves as the first input signal of the fourth AND gate circuit, and the output terminal of the fourth AND gate circuit serves as the output terminal of the reverse recovery period protection trigger unit; a reverse recovery period protection positive voltage detection and judgment unit, used to determine whether the positive voltage reaches a fourth threshold, connected to the fourth AND gate circuit, wherein the output signal of the reverse recovery period protection positive voltage detection and judgment unit serves as the second input signal of the fourth AND gate circuit; a negative voltage detection and judgment unit, used to determine whether the negative voltage reaches a fifth threshold; and an RS trigger connected to the negative voltage detection and judgment unit and the trigger output unit, wherein the output signal of the negative voltage detection and judgment unit serves as the output terminal of the reverse recovery period protection trigger unit. The RS flip-flop's set input signal and the trigger output unit's output signal serve as the RS flip-flop's reset input signal. A first pulse width generation unit, used to open an enable window with a set pulse width, is connected to the RS flip-flop and the fourth AND gate circuit. The RS flip-flop's output signal serves as the first pulse width generation unit's input signal, and the first pulse width generation unit's output signal serves as the fourth AND gate circuit's third input signal. Within the enable window range, if the energy harvesting voltage detection and judgment unit determines that the energy harvesting voltage reaches a second threshold, the reverse recovery period protection positive voltage detection and judgment unit determines that the positive voltage reaches a fourth threshold, and the negative voltage detection and judgment unit determines that the negative voltage reaches a fifth threshold, the fourth AND gate circuit outputs the third output signal and the third report output signal.

[0010] For example, in some embodiments of this application, the reverse recovery period protection trigger unit further includes: a protective trigger positive voltage rise rate detection and judgment unit, used to determine whether the rise rate of the positive voltage reaches a sixth threshold, connected to the fourth AND gate circuit, the output signal of the protective trigger positive voltage rise rate detection and judgment unit serving as the fourth input signal of the fourth AND gate circuit, and including: a protective trigger positive voltage rise rate detection unit, used to detect the rise rate of the positive voltage; a protective trigger positive voltage rise rate judgment unit, used to determine the rise rate of the positive voltage; wherein, within the enable window range, when the energy harvesting voltage detection and judgment unit determines that the energy harvesting voltage reaches a second threshold, the reverse recovery period protection positive voltage detection and judgment unit determines that the positive voltage reaches a fourth threshold, the negative voltage detection and judgment unit determines that the negative voltage reaches a fifth threshold, and the protective trigger positive voltage rise rate detection and judgment unit determines that the rise rate of the positive voltage reaches a sixth threshold, the fourth AND gate circuit outputs the third output signal and the third report output signal.

[0011] For example, in some embodiments of this application, the reporting unit includes: a second pulse width generation unit connected to the output terminal of the normal triggering unit, wherein the first reporting output signal serves as the input signal of the second pulse width generation unit; a second diode unit connected to the output terminal of the second pulse width generation unit for outputting the reporting pulse of the second pulse width generation unit; a third pulse width generation unit connected to the output terminal of the protective triggering unit, wherein the second reporting output signal serves as the input signal of the third pulse width generation unit; a third diode unit connected to the output terminal of the third pulse width generation unit for outputting the reporting pulse of the third pulse width generation unit; a fourth pulse width generation unit connected to the output terminal of the reverse recovery period protection triggering unit, wherein the third reporting output signal serves as the input signal of the fourth pulse width generation unit; and a fourth diode unit connected to the output terminal of the fourth pulse width generation unit for outputting the reporting pulse of the fourth pulse width generation unit.

[0012] For example, in some embodiments of this application, the trigger output unit includes: a first OR gate circuit, connected to the output terminals of the normal trigger unit, the protective trigger unit, and the reverse recovery period protection trigger unit, respectively, wherein the first output signal, the second output signal, and the third output signal serve as the first input signal, the second input signal, and the third input signal of the first OR gate unit; and a fifth diode unit, connected to the output terminal of the first OR gate circuit, for forwarding the gate trigger pulse of the first OR gate circuit; wherein, when at least one of the first input signal, the second input signal, and the third input signal is valid, the first OR gate circuit outputs the gate trigger pulse.

[0013] According to a second aspect of this application, at least one embodiment of this application provides a trigger control method based on a trigger controller as described in any one of the first aspects, comprising: activating the trigger controller; determining whether the energy harvesting voltage of the converter valve reaches a second threshold; if the energy harvesting voltage reaches the second threshold, determining whether the normal triggering unit, the protective triggering unit, and the reverse recovery period protection triggering unit output a report output signal and an output signal; if at least one of the normal triggering unit, the protective triggering unit, and the reverse recovery period protection triggering unit outputs a report output signal, the report unit outputs a report pulse; if at least one of the normal triggering unit, the protective triggering unit, and the reverse recovery period protection triggering unit outputs an output signal, the trigger output unit outputs a gate trigger pulse.

[0014] For example, in some embodiments of this application, the normal triggering unit includes a trigger pulse photoelectric conversion unit, a positive pressure detection and judgment unit, an energy harvesting voltage detection and judgment unit, a first AND gate circuit, and a second AND gate circuit. Determining whether the normal triggering unit outputs a report output signal and an output signal includes: the positive pressure detection and judgment unit determining whether the positive voltage of the converter valve reaches a first threshold; if the positive voltage reaches the first threshold, the first AND gate circuit outputs a first report output signal to the report unit; determining whether the trigger pulse photoelectric conversion unit receives a trigger pulse issued by the upper-level control unit; if the trigger pulse photoelectric conversion unit receives a trigger pulse issued by the upper-level control unit, the second AND gate circuit outputs the first output signal to the trigger output unit.

[0015] For example, in some embodiments of this application, the protective triggering unit includes a forward overvoltage detection unit, a protective triggering forward voltage rise rate detection unit, a protective triggering forward voltage calculation and judgment unit, and a third AND gate circuit. Determining whether the protective triggering unit outputs a report output signal and an output signal includes: the protective triggering forward voltage rise rate detection unit detects the forward voltage rise rate; the forward overvoltage detection unit detects a forward overvoltage; the protective triggering forward voltage calculation and judgment unit receives the forward voltage rise rate sent by the protective triggering forward voltage rise rate detection unit, calculates the forward overvoltage value using the forward voltage rise rate, and determines whether the forward overvoltage reaches a third threshold; if the forward overvoltage reaches the third threshold, the third AND gate circuit outputs a second report output signal to the report unit; the third AND gate circuit outputs the second output signal to the triggering output unit.

[0016] For example, in some embodiments of this application, the reverse recovery period protection trigger unit includes a reverse recovery period protection positive voltage detection and judgment unit, a negative voltage detection and judgment unit, an RS flip-flop, a first pulse width generation unit, and a fourth AND gate circuit. Determining whether the reverse recovery period protection trigger unit outputs a report output signal and an output signal includes: determining whether the RS flip-flop receives a valid output signal from the trigger output unit; resetting the RS flip-flop if the output signal from the trigger output unit is valid; determining whether the negative voltage reaches a fifth threshold if the negative voltage detection and judgment unit determines that the negative voltage reaches the fifth threshold; setting the RS flip-flop and opening an enable window with a set pulse width for the first pulse width generation unit; determining whether the positive voltage reaches a fourth threshold if the reverse recovery period protection positive voltage detection and judgment unit determines that the positive voltage reaches the fourth threshold; and the fourth AND gate circuit outputs a third report output signal to the report unit if the fourth AND gate circuit outputs a third output signal to the trigger output unit.

[0017] For example, in some embodiments of this application, the reverse recovery period protection trigger unit further includes a reverse recovery period protection trigger positive voltage rise rate determination unit to determine whether the reverse recovery period protection trigger unit outputs a report output signal and an output signal, including: determining whether the RS trigger receives the output signal from the trigger output unit and whether it is valid; if the output signal from the trigger output unit is valid, the RS trigger is reset; the negative voltage detection determination unit determines whether the negative voltage reaches a fifth threshold; if the negative voltage detection determination unit determines that the negative voltage reaches the fifth threshold, the RS trigger is set, and the first pulse width generation... The unit opens an enable window with a set pulse width; the reverse recovery period protection positive voltage detection and judgment unit determines whether the forward voltage reaches the fourth threshold; the reverse recovery period protection trigger forward voltage rise rate judgment unit determines whether the forward voltage rise rate reaches the sixth threshold; when the reverse recovery period protection positive voltage detection and judgment unit determines that the forward voltage reaches the fourth threshold and the reverse recovery period protection trigger forward voltage rise rate judgment unit determines that the forward voltage rise rate reaches the sixth threshold, the fourth AND gate circuit outputs a third report output signal to the report unit; the fourth AND gate circuit outputs a large output signal to the trigger output unit.

[0018] According to a third aspect of this application, at least one embodiment of this application provides a converter valve, comprising: a primary semiconductor stage or at least two semiconductor stages connected in series, the semiconductor stage comprising: a trigger controller as described in any one aspect of the first aspect; a semiconductor device connected to the trigger controller to receive a gate trigger pulse from the trigger controller; a damping circuit connected to the semiconductor device and the trigger controller; and a voltage equalization circuit connected to the semiconductor device and the trigger controller.

[0019] This application provides a trigger controller, a trigger control method, and a converter valve. The trigger controller has a simple circuit structure and simple control logic, and is reliable in operation. It provides sufficient trigger energy to trigger the converter valve through the judgment of multiple AND gate circuits. Furthermore, by managing the operating logic of each unit, it ensures that the trigger controller only outputs a trigger pulse when the voltage condition and logic judgment condition are met, thereby solving the problems of existing trigger controllers that are prone to sending trigger pulses erroneously and causing damage to the converter valve when the trigger energy is insufficient.

[0020] It should be understood that the above general description and the following detailed description are merely exemplary and do not limit this application. Attached Figure Description

[0021] The above and other objects, features, and advantages of this application will become more apparent from the detailed description of exemplary embodiments with reference to the accompanying drawings. The drawings described below are merely some embodiments of this application and are not intended to limit the scope of this application.

[0022] Figure 1 A schematic diagram of a trigger controller is shown in an exemplary embodiment;

[0023] Figure 2 A second embodiment of an exemplary trigger controller schematic diagram is shown;

[0024] Figure 3 A third embodiment of an exemplary trigger controller schematic diagram is shown;

[0025] Figure 4 A fourth embodiment of an exemplary trigger controller schematic diagram is shown;

[0026] Figure 5 A flowchart illustrating a trigger control method of an exemplary embodiment is shown.

[0027] Figure 6 A second embodiment of an exemplary trigger control method flowchart is shown;

[0028] Figure 7 A third embodiment of an exemplary trigger control method flowchart is shown;

[0029] Figure 8A fourth embodiment of an exemplary trigger control method flowchart is shown;

[0030] Figure 9 A schematic diagram of a converter valve in an exemplary embodiment is shown;

[0031] Figure 10 Another embodiment of an exemplary converter valve schematic diagram is shown;

[0032] Figure 11 A waveform diagram illustrating an exemplary embodiment;

[0033] Figure 12 A schematic diagram showing the setting of the protective trigger positive voltage calculation and judgment unit in an exemplary embodiment is provided.

[0034] Figure 13 A schematic diagram of the protection range of a reverse recovery period protection triggering unit is shown in an exemplary embodiment. Detailed Implementation

[0035] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the embodiments set forth herein; rather, they are provided so that this application will be thorough and complete, and will fully convey the concept of the exemplary embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar parts, and therefore repeated descriptions of them will be omitted.

[0036] The described features, structures, or characteristics can be combined in any suitable manner in one or more embodiments. Numerous specific details are provided in the following description to give a full understanding of embodiments of this disclosure. However, those skilled in the art will recognize that the technical solutions of this disclosure can be practiced without one or more of these specific details, or other methods, components, materials, devices, etc. In these cases, well-known structures, methods, devices, implementations, materials, or operations will not be shown or described in detail.

[0037] The flowcharts shown in the accompanying drawings are merely illustrative and do not necessarily include all content, operations, or steps, nor do they necessarily need to be performed in the described order. For example, some operations or steps can be broken down, while others can be combined or partially combined; therefore, the actual execution order may change depending on the specific circumstances.

[0038] The terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish different objects, not to describe a specific order. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or apparatus that includes a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to these processes, methods, products, or apparatuses.

[0039] Those skilled in the art will understand that the accompanying drawings are merely schematic diagrams of exemplary embodiments, and the modules or processes in the drawings are not necessarily essential for implementing this application, and therefore cannot be used to limit the scope of protection of this application.

[0040] Figure 1 A schematic diagram of a trigger controller of an exemplary embodiment is shown.

[0041] like Figure 1 As shown, the trigger controller includes a normal trigger unit 101, a protective trigger unit 102, a reverse recovery period protection trigger unit 103, a report unit 104, and a trigger output unit 105.

[0042] According to the example embodiment, the normal triggering unit 101 is used to receive the trigger pulse sent by the upper control unit and determine whether the positive voltage and the energy extraction voltage are valid, that is, to determine whether the positive voltage of the converter valve reaches the first threshold and whether the energy extraction voltage reaches the second threshold. When the positive voltage reaches the first threshold and the energy extraction voltage reaches the second threshold, the unit outputs the first output signal and the first report output signal.

[0043] The protective trigger unit 102 calculates whether the forward overvoltage is effective based on the forward voltage rise rate. That is, it determines whether the forward overvoltage reaches the third threshold based on the forward voltage rise rate. When the energy harvesting voltage reaches the second threshold and the forward overvoltage reaches the third threshold, it outputs the second output signal and the second report output signal.

[0044] The reverse recovery period protection trigger unit 103 is used to determine whether the positive voltage and negative voltage are effective, that is, to determine whether the positive voltage reaches the fourth threshold and whether the negative voltage of the converter valve reaches the fifth threshold. When the energy extraction voltage reaches the second threshold and the positive voltage reaches the fourth threshold and the negative voltage reaches the fifth threshold, the third output signal and the third report output signal are output.

[0045] The reporting unit 104 is used to receive valid signals from the normal triggering unit 101, the protective triggering unit 102 and the reverse recovery period protection triggering unit 103 and to send a reporting pulse. That is, it receives the first reporting output signal sent by the normal triggering unit, the second reporting output signal sent by the protective triggering unit and the third reporting output signal sent by the reverse recovery period protection triggering unit, and outputs a reporting pulse when the reporting unit receives any reporting output signal.

[0046] The trigger output unit 105 is used to receive the output signals of the normal trigger unit 101, the protective trigger unit 102 and the reverse recovery period protection trigger unit 103 and to send a gate trigger pulse. That is, it receives the first output signal sent by the normal trigger unit, the second output signal sent by the protective trigger unit and the third output signal sent by the reverse recovery period protection trigger unit. When the trigger output unit receives any of the output signals, it outputs a gate trigger pulse to trigger the semiconductor device.

[0047] The normal triggering unit 101 includes a trigger pulse photoelectric conversion unit 1011, a first diode unit 1012, a positive voltage detection and judgment unit 1013, an energy harvesting voltage detection and judgment unit 1014, a first AND gate circuit 1015, and a second AND gate circuit 1016.

[0048] The trigger pulse photoelectric conversion unit 1011 receives trigger pulses from the upper-level control unit and converts them into output signals, which are then output to the first diode unit. The positive voltage detection and judgment unit 1013 determines whether the positive voltage is valid. The energy harvesting voltage detection and judgment unit 1014 determines whether the energy harvesting voltage is valid.

[0049] The trigger pulse photoelectric conversion unit receives trigger pulses from the upper-level control unit and converts them into output signals. The output terminal of the trigger pulse photoelectric conversion unit is connected to the anode of the first diode unit. The cathode of the first diode unit is connected to the first input terminal of the second AND gate circuit. The output signal of the trigger pulse photoelectric conversion unit, after passing through the first diode unit, serves as the first input signal of the second AND gate circuit. The output terminal of the positive voltage detection and judgment unit is connected to the first input terminal of the first AND gate circuit. The positive voltage detection and judgment unit determines whether the positive voltage reaches a first threshold. If the positive voltage reaches the first threshold, the output signal of the positive voltage detection and judgment unit serves as the first input signal of the first AND gate circuit. The output terminal of the energy harvesting voltage detection and judgment unit is connected to the second input terminal of the first AND gate circuit. The energy harvesting voltage detection and judgment unit determines whether the energy harvesting voltage reaches a second threshold. If the energy harvesting voltage reaches the second threshold, the output signal of the energy harvesting voltage detection and judgment unit serves as the second input signal of the first AND gate circuit. The output terminal of the first AND gate circuit is connected to the input terminal of the second AND gate circuit. The output signal of the first AND gate circuit serves as the second input signal of the second AND gate circuit, and the output terminal of the second AND gate circuit serves as the output terminal of the normal trigger unit.

[0050] According to the example embodiment, when the trigger pulse photoelectric conversion unit of the normal triggering unit receives the trigger pulse sent by the upper-level control unit, and the positive voltage detection and judgment unit determines that the positive voltage has reached the first threshold, and the energy harvesting voltage detection and judgment unit determines that the energy harvesting voltage has reached the second threshold, the first AND gate circuit output is valid, that is, it outputs the first report output signal. The second AND gate circuit output is also valid, that is, it outputs the first output signal. The first AND gate circuit outputs the first report output signal to the second pulse width generation unit, which outputs a pulse of a set width, and the report unit issues a report pulse. The second AND gate circuit outputs the first output signal to the first OR gate circuit of the trigger output unit, and the trigger output unit issues a gate trigger pulse.

[0051] According to some embodiments, the forward voltage detection threshold is set to be at least greater than 3 volts, and the energy harvesting voltage detection threshold is set to be at least greater than 3 volts: that is, when the forward voltage detection judgment unit detects a forward voltage greater than 3V, it outputs a valid signal; when the energy harvesting voltage detection judgment unit detects an energy harvesting voltage greater than 3V, it outputs a valid signal.

[0052] The protective triggering unit 102 includes a forward overvoltage detection unit 1021, a protective triggering forward voltage rise rate detection unit 1022, a protective triggering forward voltage calculation and judgment unit 1023, and a third AND gate circuit 1024.

[0053] The forward overvoltage detection unit 1021 is used to detect forward overvoltage. The protective trigger forward voltage rise rate detection unit 1022 is used to detect the rise rate of the forward voltage. The protective trigger forward voltage calculation and judgment unit 1023 calculates whether the forward overvoltage is valid based on the rise rate of the forward voltage, that is, determines whether the forward overvoltage reaches the third threshold based on the rise rate of the forward voltage.

[0054] The output of the forward overvoltage detection unit is connected to the first input of the protective trigger forward voltage calculation and judgment unit, and the output signal of the forward overvoltage detection unit serves as the first input signal of the protective trigger forward voltage calculation and judgment unit. The output of the protective trigger forward voltage rise rate detection unit is connected to the second input of the protective trigger forward voltage calculation and judgment unit, and the output signal of the protective trigger forward voltage rise rate detection unit serves as the second input signal of the protective trigger forward voltage calculation and judgment unit. The output of the protective trigger forward voltage calculation and judgment unit is connected to the first input of the third AND gate circuit, and the output signal of the protective trigger forward voltage calculation and judgment unit serves as the first input signal of the third AND gate circuit. The output of the energy harvesting voltage detection and judgment unit 1014 is connected to the second input of the third AND gate circuit, and the output signal of the energy harvesting voltage detection and judgment unit serves as the second input signal of the third AND gate circuit.

[0055] When the output signal of the energy harvesting voltage detection and judgment unit of the trigger pulse photoelectric conversion unit is valid, that is, when the energy harvesting voltage detection and judgment unit determines that the energy harvesting voltage has reached the second threshold, and when the protective trigger unit calculates the positive overvoltage validity by the positive voltage rise rate detected in real time, that is, when the protective trigger positive voltage calculation and judgment unit determines that the positive overvoltage has reached the third threshold, the third AND gate circuit outputs the second output signal and the second report output signal.

[0056] The protective trigger forward voltage rise rate detection unit detects the forward voltage rise rate, and the forward overvoltage detection unit detects an overvoltage and outputs a signal to the protective trigger forward voltage calculation and judgment unit. The protective trigger forward voltage calculation and judgment unit determines that the forward overvoltage is valid and sends a valid signal to the third AND gate circuit. The third AND gate circuit outputs a second report output signal to the third pulse width generation unit, which outputs a pulse of a set width, and the report unit issues a report pulse. The third AND gate circuit outputs a second output signal to the first OR gate circuit of the trigger output unit, and the trigger output unit issues a gate trigger pulse.

[0057] The reverse recovery period protection trigger unit 103 includes a reverse recovery period protection positive voltage detection and judgment unit 1031, a negative voltage detection and judgment unit 1032, a reset / set trigger 1033, a first pulse width generation unit 1034, and a fourth AND gate circuit 1035. The reset / set trigger 1033 is also known as an RS trigger, hereinafter referred to as an RS trigger.

[0058] The reverse recovery period protection positive voltage detection and judgment unit 1031 is used to determine whether the positive voltage is valid, that is, whether the positive voltage reaches the fourth threshold. The negative voltage detection and judgment unit 1032 is used to determine whether the negative voltage is valid, that is, whether the negative voltage reaches the fifth threshold. The first pulse width generation unit 1034 is used to open the enable window for setting the pulse width.

[0059] The output of the positive voltage detection and judgment unit for reverse recovery period protection is connected to the second input of the fourth AND gate circuit, and the output signal of the positive voltage detection and judgment unit for reverse recovery period protection serves as the second input signal of the fourth AND gate circuit. The output of the negative voltage detection and judgment unit is connected to the set input S of the RS flip-flop, and the output signal of the negative voltage detection and judgment unit serves as the set input signal of the RS flip-flop. The output of the trigger output unit 105 is connected to the reset input of the RS flip-flop, and the output signal of the trigger output unit serves as the reset input signal of the RS flip-flop. The output of the RS flip-flop is connected to the input of the first pulse width generation unit, and the output signal of the RS flip-flop serves as the input signal of the first pulse width generation unit. The output of the first pulse width generation unit is connected to the third input of the fourth AND gate circuit, and the output signal of the first pulse width generation unit serves as the third input signal of the fourth AND gate circuit. The output of the energy harvesting voltage detection and judgment unit 1014 is connected to the first input of the fourth AND gate circuit, and the output signal of the energy harvesting voltage detection and judgment unit serves as the first input signal of the fourth AND gate circuit.

[0060] When the output signal from the trigger output unit is valid, the RS flip-flop is reset. When the negative voltage detection and judgment unit detects that the negative voltage reaches the fifth threshold, it outputs a valid signal to the RS flip-flop to set the RS flip-flop to valid. The RS flip-flop outputs a signal to the first pulse width generation unit. The first pulse width generation unit opens an enable window of a certain pulse width.

[0061] Within this window range, when both the reverse recovery period protection positive voltage detection and judgment unit and the energy harvesting voltage detection and judgment unit output valid signals—that is, when the reverse recovery period protection positive voltage detection and judgment unit determines that the forward voltage has reached the fourth threshold and the energy harvesting voltage detection and judgment unit determines that the energy harvesting voltage has reached the second threshold—both the reverse recovery period protection positive voltage detection and judgment unit and the energy harvesting voltage detection and judgment unit output valid signals to the fourth AND gate circuit. The fourth AND gate circuit outputs a third report output signal to the fourth pulse width generation unit, which outputs a pulse of a set width, and the report unit issues a report pulse. The fourth AND gate circuit outputs a fourth output signal to the first OR gate circuit of the trigger output unit, and the trigger output unit issues a gate trigger pulse.

[0062] The reporting unit 104 includes a second pulse width generation unit 1041, a second diode unit 1042, a third pulse width generation unit 1043, a third diode unit 1044, a fourth pulse width generation unit 1045, and a fourth diode unit 1046.

[0063] The second pulse width generation unit 1041 receives a valid signal from the normal trigger unit 101, and the first report output signal serves as the input signal for the second pulse width generation unit. The third pulse width generation unit 1043 receives a valid signal from the protective trigger unit 102, and the second report output signal serves as the input signal for the third pulse width generation unit. The fourth pulse width generation unit 1045 receives a valid signal from the reverse recovery period protection trigger unit 103, and the third report output signal serves as the input signal for the fourth pulse width generation unit. Upon receiving the report output signal, the report unit emits a report pulse.

[0064] The output of the first AND gate 1015 is connected to the input of the second pulse width generation unit, and its output signal serves as the input signal for the second pulse width generation unit. The output of the second pulse width generation unit is connected to the input of the second diode unit, and its output signal serves as the input signal for the second diode unit, used to output the report pulse of the second pulse width generation unit. The output of the third AND gate 1024 is connected to the input of the third pulse width generation unit, and its output signal serves as the input signal for the third pulse width generation unit. The output of the third pulse width generation unit is connected to the input of the third diode unit, and its output signal serves as the input signal for the third diode unit, used to output the report pulse of the third pulse width generation unit. The output of the fourth AND gate 1035 is connected to the input of the fourth pulse width generation unit, and its output signal serves as the input signal for the fourth pulse width generation unit. The output of the fourth pulse width generation unit is connected to the input of the fourth diode unit, and its output signal serves as the input signal for the fourth diode unit, used to output the report pulse of the fourth pulse width generation unit. The output signals of the second diode unit, the third diode unit, and the fourth diode unit serve as the output signals of the feedback unit.

[0065] The trigger output unit 105 includes a first OR gate circuit 1051 and a fifth diode unit 1052.

[0066] The first OR gate circuit 1051 is used to receive the output signals of the normal trigger unit 101, the protective trigger unit 102 and the reverse recovery period protection trigger unit 103, and to issue a gate trigger pulse when there is a valid signal in the received output signal, so as to trigger the semiconductor device.

[0067] The output of the second AND gate 1016 is connected to the first input of the first OR gate, and the output signal of the second AND gate serves as the first input signal of the first OR gate. The output of the third AND gate 1024 is connected to the second input of the first OR gate, and the output signal of the third AND gate serves as the second input signal of the first OR gate. The output of the fourth AND gate 1035 is connected to the third input of the first OR gate, and the output signal of the fourth AND gate serves as the third input signal of the first OR gate. The output of the first OR gate is connected to the input of the fifth diode unit, relaying the gate trigger pulse of the first OR gate, and the output signal of the first OR gate serves as the input signal of the fifth diode unit. The output signal of the fifth diode unit serves as the output signal of the trigger output unit.

[0068] According to the example embodiment, when any one of the second, third, and fourth AND gate circuits outputs a valid signal to the first OR gate circuit of the trigger output unit, the first OR gate circuit outputs a valid signal and sends the output gate trigger pulse to the semiconductor device.

[0069] The trigger controller provided in this application has a simple circuit structure and simple control logic, and is reliable in operation. It provides sufficient trigger energy to trigger the converter valve through the judgment of multiple AND gate circuits. Furthermore, by managing the operating logic of each unit, it ensures that the trigger controller only outputs the trigger pulse when the voltage condition and the logic judgment condition are met, so as to solve the problems of existing trigger controllers that are prone to sending trigger pulses erroneously and causing damage to the converter valve when the trigger energy is insufficient.

[0070] Figure 2 A second embodiment of an exemplary trigger controller schematic diagram is shown.

[0071] like Figure 2 As shown, Figure 2 The circuit structure of the trigger controller shown is similar to Figure 1 The images shown are basically the same, with the only difference being that... Figure 2 The reverse recovery period protection triggering unit further includes a protective trigger forward voltage rise rate detection and judgment unit. The protective trigger forward voltage rise rate detection and judgment unit is used to determine whether the rise rate of the forward voltage reaches a sixth threshold. The protective trigger forward voltage rise rate detection and judgment unit includes a protective trigger forward voltage rise rate detection unit 1036 and a protective trigger forward voltage rise rate judgment unit 1037. The protective trigger forward voltage rise rate detection unit is used to detect the rise rate of the forward voltage. The protective trigger forward voltage rise rate judgment unit is used to determine the rise rate of the forward voltage.

[0072] The output of the protective trigger positive voltage rise rate detection unit is connected to the input of the protective trigger positive voltage rise rate judgment unit, and the output signal of the protective trigger positive voltage rise rate detection unit serves as the input signal of the protective trigger positive voltage rise rate judgment unit. The output of the protective trigger positive voltage rise rate judgment unit is connected to the input of the fourth AND gate circuit, and the output signal of the protective trigger positive voltage rise rate judgment unit serves as the fourth input signal of the fourth AND gate circuit.

[0073] According to the example embodiment, when the output signal of the trigger output unit is valid, the RS flip-flop is reset. When the negative voltage detection and judgment unit detects that the negative voltage has reached the threshold value, it outputs a valid signal to the RS flip-flop. When the output of the negative voltage detection and judgment unit is valid, the RS flip-flop is set to valid. The RS flip-flop outputs a signal to the first pulse width generation unit. The first pulse width generation unit opens an enable window of a certain pulse width. Within this window range, when the outputs of the energy harvesting voltage detection and judgment unit, the reverse recovery period protection positive voltage detection and judgment unit, and the reverse recovery period protective trigger positive voltage rise rate judgment unit are all valid, that is, when the energy harvesting voltage detection and judgment unit determines that the energy harvesting voltage has reached the second threshold, the reverse recovery period protection positive voltage detection and judgment unit determines that the positive voltage has reached the fourth threshold, the negative voltage detection and judgment unit determines that the negative voltage has reached the fifth threshold, and the protective trigger positive voltage rise rate detection and judgment unit determines that the rise rate of the positive voltage has reached the sixth threshold, the energy harvesting voltage detection and judgment unit, the reverse recovery period protection positive voltage detection and judgment unit, the negative voltage detection and judgment unit, and the protective trigger positive voltage rise rate detection and judgment unit send valid signals to the fourth AND gate circuit. The fourth AND gate outputs the third report output signal to the fourth pulse width generation unit, which outputs a pulse with a set width, and the report unit issues a report pulse. The fourth AND gate outputs the third output signal to the first OR gate of the trigger output unit, and the trigger output unit issues a gate trigger pulse.

[0074] Figure 3 A third embodiment of an exemplary trigger controller schematic is shown.

[0075] like Figure 3 As shown, Figure 3 The circuit structure of the trigger controller shown is similar to Figure 1 The images shown are basically the same, with the only difference being that... Figure 3 The reverse recovery period protection triggering unit further includes a protective trigger forward voltage rise rate detection and judgment unit and a second OR gate circuit 1038. The protective trigger forward voltage rise rate detection and judgment unit is used to determine whether the rise rate of the forward voltage reaches a sixth threshold. The protective trigger forward voltage rise rate detection and judgment unit includes a protective trigger forward voltage rise rate detection unit and a protective trigger forward voltage rise rate judgment unit. The protective trigger forward voltage rise rate detection unit is used to detect the rise rate of the forward voltage. The protective trigger forward voltage rise rate judgment unit is used to determine the rise rate of the forward voltage.

[0076] The output of the protective trigger positive voltage rise rate detection unit is connected to the input of the protective trigger positive voltage rise rate judgment unit, and the output signal of the protective trigger positive voltage rise rate detection unit serves as the input signal of the protective trigger positive voltage rise rate judgment unit. The output of the reverse recovery period protection positive voltage detection and judgment unit is connected to the first input of the second OR gate circuit, and the output signal of the reverse recovery period protection positive voltage detection and judgment unit serves as the first input signal of the second OR gate circuit. The output of the protective trigger positive voltage rise rate judgment unit is connected to the second input of the second OR gate circuit, and the output signal of the protective trigger positive voltage rise rate judgment unit serves as the second input signal of the second OR gate circuit. The output of the second OR gate circuit is connected to the second input of the fourth AND gate circuit, and the output signal of the second OR gate circuit serves as the second input signal of the fourth AND gate circuit.

[0077] According to the example embodiment, when the output signal from the trigger output unit is valid, the RS flip-flop is reset. When the negative voltage detection and judgment unit detects that the negative voltage has reached the threshold value, it outputs a valid signal to the RS flip-flop. When the output from the negative voltage detection and judgment unit is valid, the RS flip-flop is set to valid. The RS flip-flop outputs a signal to the first pulse width generation unit. The first pulse width generation unit opens an enable window of a certain pulse width. Within this window range, when the output of the energy harvesting voltage detection and judgment unit is valid, and at least one of the outputs of the reverse recovery period protection positive voltage detection and judgment unit and the reverse recovery period protective trigger positive voltage rise rate judgment unit is valid, i.e., the energy harvesting voltage detection and judgment unit determines that the energy harvesting voltage has reached the second threshold, the negative voltage detection and judgment unit determines that the negative voltage has reached the fifth threshold, the reverse recovery period protection positive voltage detection and judgment unit determines that the positive voltage has reached the fourth threshold, and / or the protective trigger positive voltage rise rate detection and judgment unit determines that the rise rate of the positive voltage has reached the sixth threshold, the reverse recovery period protection positive voltage detection and judgment unit and / or the protective trigger positive voltage rise rate detection and judgment unit send a valid signal to the second OR gate circuit, and the energy harvesting voltage detection and judgment unit, the negative voltage detection and judgment unit and the second OR gate circuit send valid signals to the fourth AND gate circuit. The fourth AND gate circuit outputs a third output report signal to the fourth pulse width generation unit, the fourth pulse width generation unit outputs a pulse with a set width, and the report unit issues a report pulse. The fourth AND gate circuit outputs a third output signal to the first OR gate circuit of the trigger output unit, and the trigger output unit issues a gate trigger pulse.

[0078] Figure 4 A fourth embodiment of an exemplary trigger controller schematic is shown.

[0079] like Figure 4 As shown, Figure 4 The circuit structure of the trigger controller shown is similar to Figure 2 The images shown are basically the same, with the only difference being that... Figure 4 The reverse recovery period protection triggering unit also includes a delay unit.

[0080] The output terminal 1014 of the energy harvesting voltage detection and judgment unit is connected to the first input terminal of the fourth AND gate circuit via the delay unit 1039, and the output signal of the energy harvesting voltage detection and judgment unit serves as the first input signal of the fourth AND gate circuit.

[0081] According to the example embodiment, when the output signal from the trigger output unit is valid, the RS flip-flop is reset. When the negative voltage detection and judgment unit detects that the negative voltage has reached the threshold value, it outputs a valid signal to the RS flip-flop. When the output from the negative voltage detection and judgment unit is valid, the RS flip-flop is set to valid. The RS flip-flop outputs a signal to the first pulse width generation unit. The first pulse width generation unit opens an enable window of a certain pulse width. Within this window range, when the outputs of the delayed energy harvesting voltage detection and judgment unit, the reverse recovery period protection positive voltage detection and judgment unit, and the reverse recovery period protective trigger positive voltage rise rate judgment unit are all valid, i.e., the energy harvesting voltage detection and judgment unit determines that the energy harvesting voltage has reached the second threshold, the reverse recovery period protection positive voltage detection and judgment unit determines that the positive voltage has reached the fourth threshold, the negative voltage detection and judgment unit determines that the negative voltage has reached the fifth threshold, and the protective trigger positive voltage rise rate detection and judgment unit determines that the rise rate of the positive voltage has reached the sixth threshold, the energy harvesting voltage detection and judgment unit, the reverse recovery period protection positive voltage detection and judgment unit, the negative voltage detection and judgment unit, and the protective trigger positive voltage rise rate detection and judgment unit send valid signals to the fourth AND gate circuit. The fourth AND gate circuit outputs a third report output signal to the fourth pulse width generation unit, the fourth pulse width generation unit outputs a pulse of a set width, and the report unit issues a report pulse. The fourth AND gate circuit outputs a third output signal to the first OR gate circuit of the trigger output unit, and the trigger output unit issues a gate trigger pulse.

[0082] Figure 5 A flowchart of a trigger control method of an exemplary embodiment is shown.

[0083] like Figure 5 As shown in the diagram for the first embodiment, the trigger control method includes the following steps:

[0084] a. Trigger the controller to start.

[0085] b. Determine whether the output signal of the energy harvesting voltage detection unit is valid.

[0086] That is, to determine whether the energy extraction voltage of the converter valve reaches the second threshold by judging the normal trigger pulse.

[0087] c. If the output signal of the step energy-sensing voltage detection unit is invalid, the controller will be triggered to end operation.

[0088] That is, if the normal trigger pulse determines that the energy extraction voltage of the converter valve has not reached the second threshold, the trigger controller will stop operating.

[0089] d. If the output signal of the energy-capturing voltage detection unit is valid, then determine whether the normal triggering unit, the protective triggering unit, and the reverse recovery period protection triggering unit output a report output signal and an output signal, and the three determination schemes are set in parallel.

[0090] Determining whether the normal triggering unit outputs a report output signal and the output signal includes:

[0091] e1. Determine whether the output signal of the positive pressure detection unit is valid.

[0092] That is, the positive pressure detection and judgment unit determines whether the positive voltage of the converter valve reaches the first threshold.

[0093] f1. If step e1 is incorrect, meaning the output signal of the positive pressure detection unit is invalid, then return to step b.

[0094] If the positive voltage does not reach the first threshold, the output signal of the positive voltage detection and judgment unit is invalid, and then return to step b.

[0095] g1. If step e1 is correct, that is, the output signal of the positive pressure detection judgment unit is valid, the second pulse width generation unit outputs a pulse with a set width, and the reporting unit sends a reporting pulse.

[0096] When the positive voltage reaches the first threshold, the first AND gate circuit outputs a first report output signal to the report unit.

[0097] h1. Determine whether the trigger pulse photoelectric conversion unit has received the trigger pulse sent by the upper-level control unit.

[0098] i1. If step h1 is incorrect, meaning the trigger pulse photoelectric conversion unit has not received a valid trigger pulse from the upper-level control unit, then return to step b.

[0099] j1. If step h1 is determined to be yes, that is, the trigger pulse photoelectric conversion unit receives a valid trigger pulse from the upper control unit, the second AND gate circuit outputs a valid signal to the first OR gate circuit of the trigger output unit, the trigger output unit issues a gate trigger pulse, and returns to step b.

[0100] Determining whether the protective trigger unit outputs a report output signal and an output signal includes:

[0101] e2. The protective triggering unit detects the forward voltage rise rate in real time and calculates the forward overvoltage value based on the detected forward voltage rise rate.

[0102] The protective trigger forward voltage rise rate detection unit detects the forward voltage rise rate. The forward overvoltage detection unit detects forward overvoltage.

[0103] f2. Determine whether the output signal of the protective trigger positive voltage calculation unit is valid.

[0104] That is, the protective trigger forward voltage calculation and judgment unit receives the forward voltage rise rate sent by the protective trigger forward voltage rise rate detection unit, calculates the forward overvoltage value through the forward voltage rise rate, and determines whether the forward overvoltage reaches the third threshold.

[0105] g2. If step f2 determines no, and the output signal of the protective trigger positive voltage calculation and judgment unit is invalid, then return to step b.

[0106] If the forward overvoltage does not reach the third threshold, the output signal of the protective trigger forward voltage calculation and judgment unit is invalid.

[0107] h2. If step f2 is determined to be yes, the output signal of the protective trigger positive voltage calculation and judgment unit is valid, the third AND gate circuit outputs a valid signal to the second pulse width generation unit, the third pulse width generation unit outputs a set width pulse, and the reporting unit sends a reporting pulse.

[0108] When the forward overvoltage reaches the third threshold, the output signal of the forward voltage calculation and judgment unit is activated, and the third AND gate circuit outputs the second report output signal to the report unit.

[0109] i2. The third AND gate circuit outputs a valid signal to the first OR gate circuit of the trigger output unit, the trigger output unit issues a gate trigger pulse, and returns to step b.

[0110] Determining whether the reverse recovery period protection trigger unit outputs a report output signal and the output signal includes:

[0111] e3. Determine whether the output signal received from the trigger output unit is valid.

[0112] f3. If step e3 is incorrect, meaning the output signal of the trigger output unit is invalid, then return to step b.

[0113] g3. If step e3 is correct, i.e. the output signal of the trigger output unit is valid, then the RS flip-flop is reset.

[0114] h3. Determine whether the output signal of the negative pressure detection unit is valid.

[0115] That is, the negative voltage detection and judgment unit determines whether the negative voltage has reached the fifth threshold.

[0116] i3. If step h3 is incorrect, meaning the output signal of the negative pressure detection unit is invalid, then return to step b.

[0117] If the negative voltage does not reach the fifth threshold, the output signal of the negative voltage detection and judgment unit is invalid.

[0118] j3. If step h3 is correct, that is, the output signal of the negative pressure detection judgment unit is valid, then the RS flip-flop is set and the first pulse width generation unit opens the enable window for setting the pulse width.

[0119] That is, if the negative voltage does not reach the fifth threshold, the output signal of the negative voltage detection and judgment unit is valid.

[0120] k3. Determine whether the output signal of the reverse recovery period protection positive pressure detection judgment unit is valid.

[0121] That is, the reverse recovery period protection positive voltage detection and judgment unit determines whether the forward voltage has reached the fourth threshold.

[0122] l3. If step k3 is incorrect, meaning the output signal of the reverse recovery period protection positive pressure detection judgment unit is invalid, then return to step b.

[0123] That is, if the forward voltage does not reach the fourth threshold, the output signal of the reverse recovery period protection positive voltage detection and judgment unit is invalid.

[0124] m3. If step k3 is determined to be true, that is, the output signal of the reverse recovery period protection positive pressure detection and judgment unit is valid, then the fourth pulse width generation unit outputs a pulse with a set width, and the reporting unit sends out a reporting pulse.

[0125] When the positive voltage reaches the fourth threshold, the fourth AND gate circuit outputs the third return output signal to the return unit.

[0126] n3. The fourth AND gate circuit outputs a valid signal to the first OR gate circuit of the trigger output unit, the trigger output unit issues a gate trigger pulse, and returns to step b.

[0127] That is, the fourth AND gate circuit outputs the third output signal to the trigger output unit.

[0128] This application provides a trigger control method with a simple trigger controller circuit structure, simple control logic, and reliable operation. It provides sufficient trigger energy to trigger the converter valve through the judgment of multiple AND gate circuits. Furthermore, by managing the operating logic of each unit, it ensures that the trigger controller only outputs a trigger pulse when the voltage condition and logic judgment condition are met. This solves the problems of existing trigger controllers easily sending trigger pulses erroneously and causing damage to the converter valve when the trigger energy is insufficient.

[0129] Figure 6A second embodiment of an exemplary trigger control method flowchart is shown.

[0130] like Figure 6 The diagram shown is for the second embodiment and... Figure 5 The flowcharts shown are largely the same, with the only difference being the third flow. Figure 6 The third path shown includes:

[0131] e3. Determine whether the output signal received from the trigger output unit is valid.

[0132] f3. If step e3 is incorrect, meaning the output signal of the trigger output unit is invalid, then return to step b.

[0133] g3. If step e3 is correct, i.e. the output signal of the trigger output unit is valid, then the RS flip-flop is reset.

[0134] h3. Determine whether the output signal of the negative pressure detection unit is valid.

[0135] i3. If step h3 is incorrect, meaning the output signal of the negative pressure detection unit is invalid, then return to step b.

[0136] j3. If step h3 is correct, that is, the output signal of the negative pressure detection judgment unit is valid, then the RS flip-flop is set and the first pulse width generation unit opens the enable window for setting the pulse width.

[0137] k3. Determine whether the output signal of the reverse recovery period protection positive voltage detection judgment unit and the output signal of the reverse recovery period protection trigger positive voltage rise rate judgment unit are valid.

[0138] That is, the reverse recovery period protection positive voltage detection and judgment unit determines whether the forward voltage reaches the fourth threshold, and the reverse recovery period protection trigger forward voltage rise rate judgment unit determines whether the forward voltage rise rate reaches the sixth threshold.

[0139] If step k3 is incorrect, meaning the output signal of the reverse recovery period protection positive voltage detection judgment unit and / or the output signal of the reverse recovery period protection trigger positive voltage rise rate judgment unit are invalid, then return to step b.

[0140] That is, the reverse recovery period protection positive voltage detection and judgment unit determines that the forward voltage has not reached the fourth threshold, and / or the reverse recovery period protection trigger forward voltage rise rate judgment unit determines that the forward voltage rise rate has not reached the sixth threshold.

[0141] m3. If step k3 is determined to be true, that is, the output signal of the reverse recovery period protection positive voltage detection judgment unit and the output signal of the reverse recovery period protection trigger positive voltage rise rate judgment unit are valid, then the fourth pulse width generation unit outputs a pulse with a set width, and the reporting unit sends out a reporting pulse.

[0142] That is, the reverse recovery period protection positive voltage detection and judgment unit determines that the forward voltage reaches the fourth threshold, and the reverse recovery period protection trigger forward voltage rise rate judgment unit determines that the forward voltage rise rate reaches the sixth threshold.

[0143] n3. The fourth AND gate circuit outputs a valid signal to the first OR gate circuit of the trigger output unit, the trigger output unit issues a gate trigger pulse, and returns to step b.

[0144] Figure 7 A third embodiment of an exemplary trigger control method flowchart is shown.

[0145] like Figure 7 The diagram shown is for the third embodiment and... Figure 5 The flowcharts shown are largely the same, with the only difference being the third flow. Figure 7 The third path shown includes:

[0146] e3. Determine whether the output signal received from the trigger output unit is valid.

[0147] f3. If step e3 is incorrect, meaning the output signal of the trigger output unit is invalid, then return to step b.

[0148] g3. If step e3 is correct, i.e. the output signal of the trigger output unit is valid, then the RS flip-flop is reset.

[0149] h3. Determine whether the output signal of the negative pressure detection unit is valid.

[0150] i3. If step h3 is incorrect, meaning the output signal of the negative pressure detection unit is invalid, then return to step b.

[0151] j3. If step h3 is correct, that is, the output signal of the negative pressure detection judgment unit is valid, then the RS flip-flop is set and the first pulse width generation unit opens the enable window for setting the pulse width.

[0152] k3. Determine whether the output signal of the reverse recovery period protection positive voltage detection judgment unit or the output signal of the reverse recovery period protection trigger positive voltage rise rate judgment unit is valid.

[0153] That is, the reverse recovery period protection positive voltage detection and judgment unit determines whether the forward voltage reaches the fourth threshold, and the reverse recovery period protection trigger forward voltage rise rate judgment unit determines whether the forward voltage rise rate reaches the sixth threshold.

[0154] If step k3 is incorrect (i.e., the output signal of the reverse recovery period protection positive voltage detection judgment unit and the output signal of the reverse recovery period protection trigger positive voltage rise rate judgment unit are invalid), then return to step b.

[0155] That is, the reverse recovery period protection positive voltage detection and judgment unit determines that the forward voltage has not reached the fourth threshold, and the reverse recovery period protection trigger forward voltage rise rate judgment unit determines that the forward voltage rise rate has not reached the sixth threshold.

[0156] m3. If step k3 is determined to be true, that is, the output signal of the reverse recovery period protection positive voltage detection judgment unit and / or the output signal of the reverse recovery period protection trigger positive voltage rise rate judgment unit are valid, then the fourth pulse width generation unit outputs a pulse with a set width, and the reporting unit sends a reporting pulse.

[0157] That is, the reverse recovery period protection positive voltage detection and judgment unit determines that the forward voltage reaches the fourth threshold, and / or the reverse recovery period protection trigger forward voltage rise rate judgment unit determines that the forward voltage rise rate reaches the sixth threshold.

[0158] n3. The fourth AND gate circuit outputs a valid signal to the first OR gate circuit of the trigger output unit, the trigger output unit issues a gate trigger pulse, and returns to step b.

[0159] Figure 8 A fourth embodiment of an exemplary trigger control method flowchart is shown.

[0160] like Figure 8 The diagram shown is for the fourth embodiment, and... Figure 6 The flowcharts shown are largely the same, with the only difference being the third flow. Figure 8 The third path shown includes:

[0161] e3. Determine whether the output signal received from the trigger output unit is valid.

[0162] f3. If step e3 is incorrect, meaning the output signal of the trigger output unit is invalid, then return to step b.

[0163] g3. If step e3 is correct, i.e. the output signal of the trigger output unit is valid, then the RS flip-flop is reset.

[0164] h3. Determine whether the output signal of the negative pressure detection unit is valid.

[0165] i3. If step h3 is incorrect, meaning the output signal of the negative pressure detection unit is invalid, then return to step b.

[0166] j3. If step h3 is correct, that is, the output signal of the negative pressure detection judgment unit is valid, then the RS flip-flop is set and the first pulse width generation unit opens the enable window for setting the pulse width.

[0167] k3. Determine whether the output signal of the reverse recovery period protection positive voltage detection judgment unit and the output signal of the reverse recovery period protection trigger positive voltage rise rate judgment unit are valid.

[0168] That is, the reverse recovery period protection positive voltage detection and judgment unit determines that the forward voltage has not reached the fourth threshold, and the reverse recovery period protection trigger forward voltage rise rate judgment unit determines that the forward voltage rise rate has not reached the sixth threshold.

[0169] If step k3 is incorrect, meaning the output signal of the reverse recovery period protection positive voltage detection judgment unit and / or the output signal of the reverse recovery period protection trigger positive voltage rise rate judgment unit are invalid, then return to step b.

[0170] m3. If step k3 is determined to be true, that is, the output signal of the reverse recovery period protection positive voltage detection judgment unit and the output signal of the reverse recovery period protection trigger positive voltage rise rate judgment unit are valid. After the valid signal of the energy voltage detection judgment unit passes through the delay unit, it is input to the fourth AND gate circuit. Then the fourth pulse width generation unit outputs the set width pulse, and the reporting unit sends out the reporting pulse.

[0171] n3. The fourth AND gate circuit outputs a valid signal to the first OR gate circuit of the trigger output unit, the trigger output unit issues a gate trigger pulse, and returns to step b.

[0172] Figure 9 A schematic diagram of a converter valve in an exemplary embodiment is shown.

[0173] like Figure 9 As shown, this application also proposes a converter valve, which includes a semiconductor single stage or at least two semiconductor single stages connected in series.

[0174] The semiconductor single stage includes: a trigger controller 100 as described above, a semiconductor device 110 controlled by the trigger controller, a damping circuit 130, and a voltage equalization circuit 120.

[0175] The trigger controller is connected to the semiconductor device and outputs a gate trigger pulse to trigger the semiconductor device. One end of the damping circuit is connected to the semiconductor device, and the other end is connected to the trigger controller. One end of the voltage equalization circuit is connected to the semiconductor device, and the other end is connected to the trigger controller.

[0176] The damping circuit consists of three series branches, each including a damping capacitor and a damping resistor. One end of each branch is connected in parallel. The other ends of two branches are connected in parallel to the two ends of a semiconductor device, and the other end of the third branch is connected to a trigger controller.

[0177] Figure 10 Another embodiment of an exemplary converter valve schematic diagram is shown.

[0178] like Figure 10 As shown, Figure 10 The circuit structure of the converter valve shown is similar to Figure 9 The images shown are basically the same, with the only difference being that... Figure 10 The damping circuit in the circuit includes a damping capacitor and a damping resistor connected in series.

[0179] Figure 11 A waveform diagram illustrating an exemplary embodiment is shown.

[0180] The waveform can be used to analyze the working process of the trigger controller and control method.

[0181] Starting from time t1, the converter valve is subjected to voltage, triggering the controller to start working.

[0182] See Figure 11 At time t2, the positive pressure detection and judgment unit +U D With the energy harvesting voltage detection and judgment unit +U PS When both are valid, the output signal of the first AND gate circuit is valid, and the first pulse width generation unit outputs the set width pulse Δt1 and sends out a report pulse.

[0183] The reward pulse needs to be distinguished from reward pulses in other situations, usually by setting different pulse widths or by using special encoding.

[0184] At time t3, a valid trigger pulse is received from the superior control unit, i.e., the control pulse waveform shown in the figure. The positive pressure detection and judgment unit +U D With the energy harvesting voltage detection and judgment unit +U PS If both are valid, and the control pulse causes the trigger pulse photoelectric conversion unit to output, then the output of the second AND gate circuit is valid, and the trigger output unit sends a gate trigger pulse to turn on the semiconductor device.

[0185] According to some embodiments, in this application, the positive pressure detection threshold is set to be at least greater than 3 volts to ensure that a single stage of the converter valve has the ability to open in the positive direction; the energy harvesting voltage detection threshold is set to be at least greater than 3 volts to ensure that each chip in the trigger controller is working normally.

[0186] At time t4, the positive pressure detection and judgment unit +U D With the energy harvesting voltage detection and judgment unit +UPS All are valid, but the upper-level unit does not send a control pulse. Therefore, only the output signal of the first AND gate is valid. The first pulse width generation unit outputs the set width pulse Δt1 and sends a report pulse; while the second AND gate does not output a signal.

[0187] The protective triggering unit calculates the forward overvoltage value by detecting the forward voltage rise rate in real time. The overvoltage setpoint is related to the forward voltage rise rate; generally, the higher the forward voltage rise rate, the lower the forward overvoltage value that the converter valve can withstand.

[0188] At time t5, the positive pressure detection and judgment unit +U D The protective trigger forward voltage calculation and judgment unit f(U) PF When both dU / dt) outputs are valid, the second pulse width generation unit outputs a set width pulse Δt2 and issues a protective trigger report pulse; and the third AND gate circuit output is valid, triggering the output unit to issue a gate trigger pulse to turn on the semiconductor device.

[0189] When the RS flip-flop receives a valid output signal from the trigger output unit, the RS flip-flop is reset.

[0190] At time t7, the negative pressure detection judgment unit -U is determined. N When the output is valid, the RS flip-flop is set, and the first pulse width generation unit opens an enable window t with a certain pulse width. FBR .

[0191] Furthermore, within this time window, at time t8, the reverse recovery period protection positive pressure detection and judgment unit +U RP When the output is valid, the third pulse width generation unit outputs a set width pulse Δt3 and issues a protective trigger report pulse; and the fourth AND gate circuit output is valid, triggering the output unit to issue a gate trigger pulse to turn on the semiconductor device.

[0192] In another control method, that is, corresponding to Figure 2 or Figure 4 The trigger controller shown has an enable window t for the fourth pulse width generation unit. FBR Internal, reverse recovery period protection positive pressure detection and judgment unit +U RP The reverse recovery period protective trigger forward voltage rise rate judgment unit dU / dt RP When all outputs are valid, the third pulse width generation unit outputs a set width pulse Δt3 and issues a protective trigger report pulse; and the fourth AND gate circuit output is valid, triggering the output unit to issue a gate trigger pulse to turn on the semiconductor device.

[0193] Figure 12 A schematic diagram showing the setting of the protective trigger positive voltage calculation and judgment unit in an exemplary embodiment is provided.

[0194] In previous controllers, the protective trigger was set with a constant threshold value UBOD1. This protection setting resulted in the inability to effectively protect the converter valve during periods of high voltage rise rate.

[0195] However, in this application, the overvoltage setting is related to the forward voltage rise rate; generally, the higher the forward voltage rise rate, the lower the forward overvoltage value that the converter valve can withstand. THY_S It is the maximum voltage that a single stage of the converter valve can withstand, U BOD2 The protective trigger threshold voltage is set for the scheme in this application. It can be seen that this application lowers the protective trigger threshold, making it lower than the limit voltage that a single stage of the converter valve can withstand. Therefore, when the voltage reaches the threshold value, the controller is triggered to operate, preventing overvoltage and ensuring that the voltage value does not exceed the limit voltage that a single stage of the converter valve can withstand, thus effectively protecting the converter valve.

[0196] Figure 13 A schematic diagram of the protection range of a reverse recovery period protection triggering unit is shown in an exemplary embodiment.

[0197] The voltage across the converter valve is UThy, and the reverse recovery protection range is located at U. THY_S In the region below the curve, when the converter valve is turned on, t FBR Within the time window, the withstand voltage value and the rate of rise of the withstand voltage of the converter valve will decrease. Therefore, the converter valve can be protected against overvoltage at any given time.

[0198] It should be clearly understood that this application describes how specific examples are formed and used, but this application is not limited to any details of these examples. Rather, based on the teachings of the disclosure of this application, these principles can be applied to many other embodiments.

[0199] Furthermore, it should be noted that the above figures are merely illustrative representations of the processes included in the method according to exemplary embodiments of this application, and are not intended to be limiting. It is readily understood that the processes shown in the above figures do not indicate or limit the temporal order of these processes. Additionally, it is readily understood that these processes may be executed synchronously or asynchronously, for example, in multiple modules.

[0200] Exemplary embodiments of this application have been specifically shown and described above. It should be understood that this application is not limited to the detailed structures, arrangements, or implementation methods described herein; rather, this application is intended to cover various modifications and equivalent arrangements contained within the spirit and scope of the appended claims.

Claims

1. A trigger controller for a flow converter valve, characterized in that, include: The normal triggering unit is used to receive the trigger pulse sent by the upper control unit and determine whether the positive voltage of the converter valve reaches the first threshold and whether the energy harvesting voltage reaches the second threshold. When the positive voltage reaches the first threshold and the energy harvesting voltage reaches the second threshold, the unit outputs the first output signal and the first report output signal. A protective triggering unit is used to determine whether the positive overvoltage has reached a third threshold based on the rise rate of the positive voltage, and outputs a second output signal and a second report output signal when the energy harvesting voltage reaches a second threshold and the positive overvoltage reaches a third threshold. The reverse recovery period protection trigger unit is used to determine whether the positive voltage reaches the fourth threshold and whether the negative voltage of the converter valve reaches the fifth threshold. When the energy extraction voltage reaches the second threshold and the positive voltage reaches the fourth threshold and the negative voltage reaches the fifth threshold, it outputs a third output signal and a third report output signal. The reporting unit is configured to receive the first reporting output signal sent by the normal triggering unit, the second reporting output signal sent by the protective triggering unit, and the third reporting output signal sent by the reverse recovery period protection triggering unit, and output a reporting pulse when any reporting output signal is received; The trigger output unit is configured to receive the first output signal sent by the normal trigger unit, the second output signal sent by the protective trigger unit, and the third output signal sent by the reverse recovery period protection trigger unit, and output a gate trigger pulse to trigger the semiconductor device when any output signal is received.

2. The trigger controller as described in claim 1, characterized in that, The normal triggering unit includes: First AND gate circuit; The second AND gate circuit is connected to the first AND gate circuit. The output signal of the first AND gate circuit is used as the second input signal of the second AND gate circuit, and the output terminal of the second AND gate circuit is used as the output terminal of the normal triggering unit. A trigger pulse photoelectric conversion unit is used to receive trigger pulses sent by the upper-level control unit and convert them into output signals; The first diode unit is connected to the trigger pulse photoelectric conversion unit, and the output signal of the trigger pulse photoelectric conversion unit is used as the first input signal of the second AND gate circuit after passing through the first diode unit. A positive pressure detection and judgment unit is connected to the first AND gate circuit and is used to determine whether the positive voltage reaches a first threshold. When the positive voltage reaches the first threshold, the output signal of the positive pressure detection and judgment unit is used as the first input signal of the first AND gate circuit. A power extraction voltage detection and judgment unit is connected to the first AND gate circuit and is used to determine whether the power extraction voltage reaches a second threshold. When the power extraction voltage reaches the second threshold, the output signal of the power extraction voltage detection and judgment unit is used as the second input signal of the first AND gate circuit. Wherein, when the positive pressure detection and judgment unit determines that the positive voltage reaches the first threshold and the energy harvesting voltage detection and judgment unit determines that the energy harvesting voltage reaches the second threshold, the first AND gate circuit outputs the first report output signal; Specifically, when the upper-level control unit sends a trigger pulse to the trigger pulse photoelectric conversion unit, and the positive pressure detection and judgment unit determines that the positive voltage has reached a first threshold, and the energy harvesting voltage detection and judgment unit determines that the energy harvesting voltage has reached a second threshold, the second AND gate circuit outputs the first output signal.

3. The trigger controller as described in claim 2, characterized in that, The protective triggering unit includes: A protective trigger forward voltage calculation and judgment unit is used to determine whether the forward overvoltage has reached a third threshold based on the rise rate of the forward voltage. A forward overvoltage detection unit is used to detect the forward overvoltage and is connected to the protective trigger forward voltage calculation and judgment unit. The output signal of the forward overvoltage detection unit serves as the first input signal of the protective trigger forward voltage calculation and judgment unit. A protective trigger positive voltage rise rate detection unit is used to detect the rise rate of the positive voltage and is connected to the protective trigger positive voltage calculation and judgment unit. The output signal of the protective trigger positive voltage rise rate detection unit is used as the second input signal of the protective trigger positive voltage calculation and judgment unit. The third AND gate circuit is connected to the protective trigger positive voltage calculation and judgment unit and the energy harvesting voltage detection and judgment unit respectively. The output signal of the protective trigger positive voltage calculation and judgment unit serves as the first input signal of the third AND gate circuit, the output signal of the energy harvesting voltage detection and judgment unit serves as the second input signal of the third AND gate circuit, and the output terminal of the third AND gate circuit serves as the output terminal of the protective trigger unit. When the energy harvesting voltage detection and judgment unit determines that the energy harvesting voltage has reached the second threshold, and the protective trigger positive voltage calculation and judgment unit determines that the positive overvoltage has reached the third threshold, the third AND gate circuit outputs the second output signal and the second report output signal.

4. The trigger controller as described in claim 2, characterized in that, The reverse recovery period protection triggering unit includes: The fourth AND gate circuit is connected to the energy harvesting voltage detection and judgment unit. The output signal of the energy harvesting voltage detection and judgment unit serves as the first input signal of the fourth AND gate circuit, and the output terminal of the fourth AND gate circuit serves as the output terminal of the reverse recovery period protection trigger unit. The reverse recovery period protection positive voltage detection and judgment unit is used to determine whether the positive voltage reaches the fourth threshold. It is connected to the fourth AND gate circuit, and the output signal of the reverse recovery period protection positive voltage detection and judgment unit is used as the second input signal of the fourth AND gate circuit. A negative voltage detection and judgment unit is used to determine whether the negative voltage reaches the fifth threshold. An RS flip-flop is connected to the negative pressure detection and judgment unit and the trigger output unit. The output signal of the negative pressure detection and judgment unit serves as the set input signal of the RS flip-flop, and the output signal of the trigger output unit serves as the reset input signal of the RS flip-flop. The first pulse width generation unit is used to open an enable window for setting a pulse width, and is connected to the RS flip-flop and the fourth AND gate circuit. The output signal of the RS flip-flop is used as the input signal of the first pulse width generation unit, and the output signal of the first pulse width generation unit is used as the third input signal of the fourth AND gate circuit. Within the enabled window range, if the energy harvesting voltage detection and judgment unit determines that the energy harvesting voltage reaches the second threshold, the reverse recovery period protection positive voltage detection and judgment unit determines that the positive voltage reaches the fourth threshold, and the negative voltage detection and judgment unit determines that the negative voltage reaches the fifth threshold, the fourth AND gate circuit outputs the third output signal and the third report output signal.

5. The trigger controller as described in claim 4, characterized in that, The reverse recovery period protection triggering unit further includes: A protective trigger positive voltage rise rate detection and judgment unit is used to determine whether the rise rate of the positive voltage reaches a sixth threshold. It is connected to the fourth AND gate circuit. The output signal of the protective trigger positive voltage rise rate detection and judgment unit serves as the fourth input signal of the fourth AND gate circuit, and includes: A protective trigger forward voltage rise rate detection unit is used to detect the rise rate of the forward voltage; A protective trigger forward voltage rise rate determination unit is used to determine the rise rate of the forward voltage; Wherein, within the enable window range, if the energy harvesting voltage detection and judgment unit determines that the energy harvesting voltage reaches the second threshold, the reverse recovery period protection positive voltage detection and judgment unit determines that the positive voltage reaches the fourth threshold, the negative voltage detection and judgment unit determines that the negative voltage reaches the fifth threshold, and the protective trigger positive voltage rise rate detection and judgment unit determines that the positive voltage rise rate reaches the sixth threshold, the fourth AND gate circuit outputs the third output signal and the third report output signal.

6. The trigger controller as described in claim 1, characterized in that, The reward unit includes: The second pulse width generation unit is connected to the output terminal of the normal triggering unit, and the first report output signal is used as the input signal of the second pulse width generation unit. The second diode unit is connected to the output terminal of the second pulse width generation unit and is used to output the feedback pulse of the second pulse width generation unit; The third pulse width generation unit is connected to the output terminal of the protective trigger unit, and the second report output signal is used as the input signal of the third pulse width generation unit. The third diode unit is connected to the output terminal of the third pulse width generation unit and is used to output the feedback pulse of the third pulse width generation unit; The fourth pulse width generation unit is connected to the output terminal of the reverse recovery period protection trigger unit, and the third report output signal is used as the input signal of the fourth pulse width generation unit. The fourth diode unit is connected to the output terminal of the fourth pulse width generation unit and is used to output the feedback pulse of the fourth pulse width generation unit.

7. The trigger controller as described in claim 1, characterized in that, The trigger output unit includes: The first OR gate circuit is connected to the output terminals of the normal triggering unit, the protective triggering unit, and the reverse recovery period protection triggering unit, respectively. The first output signal, the second output signal, and the third output signal serve as the first input signal, the second input signal, and the third input signal of the first OR gate unit. The fifth diode unit is connected to the output terminal of the first OR gate circuit and is used to forward the gate trigger pulse of the first OR gate circuit; Wherein, if at least one of the first input signal, the second input signal, and the third input signal is valid, the first OR gate circuit outputs a gate trigger pulse.

8. A trigger control method, implemented based on a trigger controller as described in any one of claims 1-7, characterized in that, include: Start the trigger controller; Determine whether the energy harvesting voltage of the converter valve reaches the second threshold. When the energy extraction voltage reaches the second threshold, determine whether the normal triggering unit, the protective triggering unit, and the reverse recovery period protection triggering unit output a report output signal and an output signal; When at least one of the normal triggering unit, the protective triggering unit, and the reverse recovery period protection triggering unit outputs a report output signal, the report unit outputs a report pulse; When at least one of the normal triggering unit, the protective triggering unit, and the reverse recovery period protection triggering unit outputs an output signal, the triggering output unit outputs a gate trigger pulse.

9. The trigger control method as described in claim 8, characterized in that, The normal triggering unit includes a trigger pulse photoelectric conversion unit, a positive pressure detection and judgment unit, an energy harvesting voltage detection and judgment unit, a first AND gate circuit, and a second AND gate circuit. It determines whether the normal triggering unit outputs a report output signal and an output signal, including: The positive pressure detection and judgment unit determines whether the positive voltage of the converter valve reaches the first threshold. When the positive voltage reaches the first threshold, the first AND gate circuit outputs a first report output signal to the report unit; Determine whether the trigger pulse photoelectric conversion unit has received a trigger pulse from the upper-level control unit; When the trigger pulse photoelectric conversion unit receives the trigger pulse sent by the upper-level control unit, the second AND gate circuit outputs the first output signal to the trigger output unit.

10. The trigger control method as described in claim 8, characterized in that, The protective triggering unit includes a forward overvoltage detection unit, a protective triggering forward voltage rise rate detection unit, a protective triggering forward voltage calculation and judgment unit, and a third AND gate circuit. Determining whether the protective triggering unit outputs a report output signal and an output signal includes: The protective trigger positive voltage rise rate detection unit detects the positive voltage rise rate; The forward overvoltage detection unit detects forward overvoltage; The protective trigger forward voltage calculation and judgment unit receives the forward voltage rise rate sent by the protective trigger forward voltage rise rate detection unit, calculates the forward overvoltage value through the forward voltage rise rate, and determines whether the forward overvoltage reaches the third threshold. When the positive overvoltage reaches the third threshold, the third AND gate circuit outputs a second report output signal to the report unit; The third AND gate circuit outputs the second output signal to the trigger output unit.

11. The trigger control method as described in claim 8, characterized in that, The reverse recovery period protection trigger unit includes a reverse recovery period protection positive pressure detection and judgment unit, a negative pressure detection and judgment unit, an RS flip-flop, a first pulse width generation unit, and a fourth AND gate circuit. It determines whether the reverse recovery period protection trigger unit outputs a report output signal and an output signal, including: Determine whether the RS flip-flop receives a valid output signal from the trigger output unit; When the output signal of the trigger output unit is valid, the RS trigger is reset; The negative voltage detection and judgment unit determines whether the negative voltage reaches the fifth threshold. When the negative voltage detection and judgment unit determines that the negative voltage has reached the fifth threshold, the RS trigger is set, and the first pulse width generation unit opens the enable window for setting the pulse width. The reverse recovery period protection positive voltage detection and judgment unit determines whether the positive voltage reaches the fourth threshold. When the reverse recovery period protection positive voltage detection and judgment unit determines that the positive voltage has reached the fourth threshold, the fourth AND gate circuit outputs a third report output signal to the report unit; the fourth AND gate circuit outputs a third output signal to the trigger output unit.

12. The trigger control method as described in claim 11, characterized in that, The reverse recovery period protection triggering unit further includes a reverse recovery period protection triggering forward voltage rise rate determination unit to determine whether the reverse recovery period protection triggering unit outputs a report output signal and an output signal, including: Determine whether the RS flip-flop receives a valid output signal from the trigger output unit; When the output signal of the trigger output unit is valid, the RS trigger is reset; The negative voltage detection and judgment unit determines whether the negative voltage reaches the fifth threshold. When the negative voltage detection and judgment unit determines that the negative voltage has reached the fifth threshold, the RS trigger is set, and the first pulse width generation unit opens the enable window for setting the pulse width. The reverse recovery period protection positive voltage detection and judgment unit determines whether the positive voltage reaches the fourth threshold. The reverse recovery period protective trigger forward voltage rise rate determination unit determines whether the forward voltage rise rate reaches the sixth threshold. When the reverse recovery period protection positive voltage detection and judgment unit determines that the forward voltage reaches the fourth threshold and the reverse recovery period protection trigger forward voltage rise rate judgment unit determines that the forward voltage rise rate reaches the sixth threshold, the fourth AND gate circuit outputs a third report output signal to the report unit; the fourth AND gate circuit outputs a large output signal to the trigger output unit.

13. A flow converter valve, characterized in that, include: A single-stage semiconductor stage or at least two series-connected semiconductor stages, wherein the semiconductor stage comprises: Trigger controller as described in any one of claims 1-7; A semiconductor device, connected to the trigger controller, to receive the gate trigger pulse from the trigger controller; A damping circuit is connected to the semiconductor device and the trigger controller; The voltage equalization circuit is connected to the semiconductor device and the trigger controller.

Images