IGBT reliable conduction circuit, reliable conduction method and driver

Abstract

The application provides an IGBT reliable conduction circuit, a reliable conduction method and a driver. The circuit comprises a normal driving branch, a backup opening branch and a control circuit. The first input end of the normal driving branch is connected with the first output end of the control circuit, the second input end of the normal driving branch is externally connected with a driving power supply, and the first output end of the normal driving branch is connected with the gate of a target IGBT. The first input end of the backup opening branch is connected with the second output end of the control circuit, the second input end of the backup opening branch is externally connected with the driving power supply, and the first output end of the backup opening branch is connected with the gate of the target IGBT. By arranging the backup opening branch, when the control circuit is abnormal, the target IGBT is controlled to open according to the continuous single-level control signal sent by the abnormal control circuit, so that the IGBT is still turned on when the control circuit is in the situation of communication loss or abnormality, driving power supply under-voltage, control chip failure and the like.

Description

Technical Field

[0001] This invention relates to the field of power electronics technology, specifically to an IGBT reliable conduction circuit, a reliable conduction method, and a driver. Background Technology

[0002] High-voltage direct current (HVDC) circuit breakers are switches used to cut off and isolate faults in DC transmission systems, and are essential equipment for the development of DC transmission towards networking and the construction of DC power grids. Hybrid HVDC circuit breakers based on IGBTs consist of three parallel branches: a main branch composed of fast mechanical switches and a few sub-module units; a transfer branch composed of a majority of sub-module units; and an energy absorption branch composed of multiple sets of nonlinear resistors connected in series. The sub-modules in both the main and transfer branches are connected in series. Therefore, when the DC circuit breaker requires a branch to conduct, all IGBTs in all sub-modules must conduct simultaneously. Conversely, if a sub-module fails, all IGBTs in that sub-module must also conduct; otherwise, the unconducted sub-modules will be subjected to extremely high voltages, leading to IGBT overvoltage breakdown. Therefore, reliable IGBT conduction in hybrid HVDC circuit breakers is crucial.

[0003] The gate driver is a controller that directly controls the IGBT's turn-on or turn-off. It mainly consists of a drive power supply and a drive circuit. The drive power supply provides the energy required for the drive circuit to turn the IGBT on and off and determines the IGBT gate voltage in steady state. The drive circuit converts the received control signal into a drive power signal for the IGBT gate, controlling the IGBT's turn-on and turn-off process. It can also perform IGBT status monitoring and fault protection.

[0004] Traditional drivers control the conduction of IGBTs simply by following the drive signals issued by the upper-level controller. If communication is lost or abnormal, the drive power supply is undervoltage, or the control chip fails, reliable conduction of the IGBT cannot be guaranteed. Summary of the Invention

[0005] Therefore, the technical problem to be solved by the present invention is to overcome the defects in the prior art that cannot guarantee the reliable conduction of IGBT in the event of communication loss or abnormality, undervoltage of the driving power supply, failure of the control chip, etc., thereby providing an IGBT reliable conduction circuit, reliable conduction method and driver.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] In a first aspect, embodiments of the present invention provide a reliable IGBT turn-on circuit, comprising: a normal drive branch, a backup turn-on branch, and a control circuit, wherein...

[0008] The first input terminal of the normal drive branch is connected to the first output terminal of the control circuit, the second input terminal of the normal drive branch is connected to an external drive power supply, and the first output terminal of the normal drive branch is connected to the gate of the target IGBT.

[0009] The first input terminal of the backup power-on branch is connected to the second output terminal of the control circuit, the second input terminal of the backup power-on branch is connected to an external driving power supply, and the first output terminal of the backup power-on branch is connected to the gate of the target IGBT.

[0010] When the control circuit is working normally, the control circuit outputs a first control signal to the normal drive branch, and the normal drive branch controls the target IGBT to turn on or off according to the first control signal. At the same time, the control circuit outputs a second control signal to the backup turn-on branch, and the backup turn-on branch outputs zero voltage according to the second control signal.

[0011] When the control circuit malfunctions, it outputs a third control signal to the normal drive branch, which then operates according to the third control signal. Simultaneously, the control circuit outputs a continuous single-level control signal to the backup turn-on branch, which then controls the target IGBT to turn on according to the continuous single-level control signal.

[0012] Optionally, the backup turn-on branch includes: a monostable multivibrator and a second turn-on branch, wherein,

[0013] The first input terminal of the monostable multivibrator is connected to the second output terminal of the control circuit. The second input terminal of the monostable multivibrator is connected to an external driving power supply. The first output terminal of the monostable multivibrator is connected to the input terminal of the second turn-on branch. The output terminal of the second turn-on branch is connected to the gate of the target IGBT.

[0014] Optionally, the output pulse width of the monostable trigger is greater than the period of the second control signal.

[0015] Optionally, the IGBT reliable conduction circuit further includes: a drive power supply device, wherein a first transmission line of the drive power supply device is connected to a first input terminal of the normal drive branch, and a second transmission line of the drive power supply device is connected to a first input terminal of the backup turn-on branch.

[0016] Optionally, the normal drive branch includes: a first turn-on branch and a first turn-off branch, wherein,

[0017] The first activation branch activates the target IGBT according to the first control signal;

[0018] The first shutdown branch controls the target IGBT to shut down according to the first control signal.

[0019] Optionally, the IGBT reliable conduction circuit further includes: a first diode and a second diode, wherein,

[0020] The anode of the first diode is connected to the output terminal of the first open branch, and the cathode of the first diode is connected to the gate of the target IGBT.

[0021] The anode of the second diode is connected to the output terminal of the second open branch, and the cathode of the second diode is connected to the gate of the target IGBT.

[0022] In a second aspect, embodiments of the present invention provide a driver, including: the IGBT reliable conduction circuit described in the first aspect of the present invention.

[0023] Thirdly, embodiments of the present invention provide a reliable IGBT turn-on method, based on the reliable IGBT turn-on circuit described in the first aspect of the present invention, the reliable IGBT turn-on method comprising:

[0024] Monitor the operating status of the control circuit;

[0025] When the control circuit is working normally, the first control signal and the second control signal output by the control circuit are acquired. The normal drive branch is driven to work according to the first control signal, thereby controlling the target IGBT to turn on or off. At the same time, the backup turn-on branch is cut off according to the second control signal.

[0026] When the control circuit malfunctions, a continuous single-level control signal output by the control circuit is acquired, and the backup turn-on branch is driven to work according to the continuous single-level control signal, thereby controlling the target IGBT to turn on.

[0027] Fourthly, embodiments of the present invention provide a computer-readable storage medium storing computer instructions for causing a computer to execute the IGBT reliable conduction method described in the first aspect of the present invention.

[0028] Fifthly, embodiments of the present invention provide a computer device, including: a memory and a processor, wherein the memory and the processor are communicatively connected to each other, the memory stores computer instructions, and the processor executes the computer instructions to perform the IGBT reliable conduction method described in the first aspect of the present invention.

[0029] The technical solution of this invention has the following advantages:

[0030] This invention provides a reliable IGBT turn-on circuit, comprising: a normal drive branch, a backup turn-on branch, and a control circuit. The first input terminal of the normal drive branch is connected to the first output terminal of the control circuit, the second input terminal of the normal drive branch is connected to an external drive power supply, and the first output terminal of the normal drive branch is connected to the gate of the target IGBT. The first input terminal of the backup turn-on branch is connected to the second output terminal of the control circuit, the second input terminal of the backup turn-on branch is connected to an external drive power supply, and the first output terminal of the backup turn-on branch is connected to the gate of the target IGBT. When the control circuit is working normally... The control circuit outputs a first control signal to the normal drive branch, which controls the target IGBT to turn on or off according to the first control signal. Simultaneously, the control circuit outputs a second control signal to the backup turn-on branch, which outputs zero voltage according to the second control signal. When the control circuit malfunctions, it outputs a third control signal to the normal drive branch, which operates accordingly. Simultaneously, the control circuit outputs a continuous single-level control signal to the backup turn-on branch, which controls the target IGBT to turn on according to the continuous single-level control signal. By setting up a backup turn-on branch, when the control circuit malfunctions, the target IGBT is controlled to turn on according to the continuous single-level control signal sent by the malfunctioning control circuit. This ensures that the IGBT remains in the conducting state even in situations such as communication loss or malfunction in the control circuit, undervoltage of the drive power supply, or failure of the control chip. This effectively protects the IGBTs in the hybrid high-voltage DC circuit breaker from overvoltage breakdown due to faults.

[0031] The driver provided by the present invention, by employing the above-mentioned reliable IGBT conduction circuit, enables the IGBT to remain in a conducting state in the event of communication loss or abnormality, undervoltage of the drive power supply, or failure of the control chip.

[0032] This invention provides a reliable IGBT turn-on method, comprising: monitoring the operating status of a control circuit; when the control circuit is operating normally, acquiring a first control signal and a second control signal output by the control circuit, driving the normal drive branch to operate according to the first control signal, thereby controlling the target IGBT to turn on or off, and simultaneously cutting off the backup turn-on branch according to the second control signal; when the control circuit is operating abnormally, acquiring a continuous single-level control signal output by the control circuit, driving the backup turn-on branch to operate according to the continuous single-level control signal, thereby controlling the target IGBT to turn on. In the event of a control circuit malfunction, the target IGBT is turned on according to the continuous single-level control signal sent by the malfunctioning control circuit, thereby ensuring that the IGBT remains in the conducting state even in situations such as communication loss or abnormality in the control circuit, undervoltage of the drive power supply, or failure of the control chip. This effectively protects the IGBTs in hybrid high-voltage DC circuit breakers from overvoltage breakdown due to faults. Attached Figure Description

[0033] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0034] Figure 1 This is a schematic block diagram of a specific example of an IGBT reliable conduction circuit in an embodiment of the present invention.

[0035] Figure 2 This is a schematic block diagram of another specific example of the reliable IGBT turn-on circuit in the embodiments of the present invention;

[0036] Figure 3 This is a key waveform for reliable power-on in the embodiments of the present invention;

[0037] Figure 4 This is a flowchart illustrating a specific example of the IGBT reliable turn-on method in an embodiment of the present invention;

[0038] Figure 5 This is a compositional diagram of a specific example of the computer device provided in this invention. Detailed Implementation

[0039] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0040] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0041] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can also refer to the internal connection of two components; and they can refer to a wireless connection or a wired connection. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0042] Furthermore, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0043] This invention provides a reliable IGBT turn-on circuit, such as... Figure 1 As shown, it includes: normal drive branch 1, backup power-on branch 2 and control circuit 3.

[0044] In one specific embodiment, the first input terminal of the normal drive branch 1 is connected to the first output terminal of the control circuit 3, the second input terminal of the normal drive branch 1 is externally connected to the drive power supply VCC1, and the first output terminal of the normal drive branch 1 is connected to the gate of the target IGBT. The first input terminal of the backup turn-on branch 2 is connected to the second output terminal of the control circuit 3, the second input terminal of the backup turn-on branch 2 is externally connected to the drive power supply VCC2, and the first output terminal of the backup turn-on branch 2 is connected to the gate of the target IGBT.

[0045] In this embodiment of the invention, when the control circuit 3 is operating normally, the control circuit 3 outputs a first control signal to the normal drive branch 1. The normal drive branch 1 controls the target IGBT to turn on or off according to the first control signal. Simultaneously, the control circuit outputs a second control signal to the backup turn-on branch 2. The backup turn-on branch 2 outputs zero voltage according to the second control signal. When the control circuit 3 malfunctions, the control circuit 3 outputs a third control signal to the normal drive branch 1. The normal drive branch 1 operates according to the third control signal. Simultaneously, the control circuit 3 outputs a continuous single-level control signal to the backup turn-on branch 2. The backup turn-on branch 2 controls the target IGBT to turn on according to the continuous single-level control signal.

[0046] In this embodiment of the invention, the first control signal is the normal control signal of the IGBT, and its duty cycle is adjusted according to actual needs. The second control signal is a high-frequency square wave signal, and its period is set according to the internal parameters of the backup turn-on branch 2, ensuring that the backup turn-on branch 2 outputs zero voltage after receiving the second control signal. The third control signal is not limited here, because at this time, regardless of the output state of the normal drive branch 1, the target IGBT will be turned on by the backup turn-on branch 2 applying a positive voltage.

[0047] Specifically, VCC1 and VCC2 are two independent voltages output from the drive power supply. VCC1 supplies power to the normal drive branch 1, and VCC2 supplies power to the backup power-on branch 2. The control circuit 3 outputs two signals: one sends a control signal to the normal drive branch 1, and the other sends a control signal to the backup power-on branch 2.

[0048] Furthermore, the normal drive branch 1 is the same as a conventional driver, receiving the first control signal sent by the control circuit 3 and converting it into a gate power signal capable of driving the target IGBT to turn it on or off. The backup turn-on branch 2 receives the backup control signal output by the control circuit 3. If the backup control signal is a high-frequency square wave, the backup turn-on branch 2 outputs zero voltage. If the backup control signal is continuously at a single level (high level or low level), the backup turn-on branch 2 outputs a positive turn-on voltage to control the target IGBT to turn on.

[0049] Under normal conditions, the backup control signal output by control circuit 3 is a high-frequency square wave, and the backup turn-on branch 2 outputs zero voltage, so the IGBT is controlled by the normal drive branch 1. However, under abnormal conditions, the backup signal output by control circuit 3 remains at a single level, and the backup turn-on branch 2 outputs a turn-on voltage. At this time, regardless of the output state of the normal drive branch 1, the gate of the target IGBT is turned on by applying a positive voltage.

[0050] In this embodiment of the invention, the control circuit 3 can be a circuit built from discrete components or an integrated circuit. Specifically, the control circuit 3 includes, but is not limited to, a microcontroller, DSP, ARM, FPGA, CPLD, etc. When communication is lost or abnormal, or the drive power supply VCC1 is undervoltage, the control signal output by the control circuit 3 remains at a high level. In particular, when the control circuit 3 fails or crashes, it outputs a continuous single level (high level or low level).

[0051] This invention provides a reliable IGBT turn-on circuit, comprising: a normal drive branch, a backup turn-on branch, and a control circuit. The first input terminal of the normal drive branch is connected to the first output terminal of the control circuit, the second input terminal of the normal drive branch is connected to an external drive power supply, and the first output terminal of the normal drive branch is connected to the gate of the target IGBT. The first input terminal of the backup turn-on branch is connected to the second output terminal of the control circuit, the second input terminal of the backup turn-on branch is connected to an external drive power supply, and the first output terminal of the backup turn-on branch is connected to the gate of the target IGBT. When the control circuit is working normally... The control circuit outputs a first control signal to the normal drive branch, which controls the target IGBT to turn on or off according to the first control signal. Simultaneously, the control circuit outputs a second control signal to the backup turn-on branch, which outputs zero voltage according to the second control signal. When the control circuit malfunctions, it outputs a third control signal to the normal drive branch, which operates accordingly. Simultaneously, the control circuit outputs a continuous single-level control signal to the backup turn-on branch, which controls the target IGBT to turn on according to the continuous single-level control signal. By setting up a backup turn-on branch, when the control circuit malfunctions, the target IGBT is controlled to turn on according to the continuous single-level control signal sent by the malfunctioning control circuit. This ensures that the IGBT remains in the conducting state even in situations such as communication loss or malfunction in the control circuit, undervoltage of the drive power supply, or failure of the control chip. This effectively protects the IGBTs in the hybrid high-voltage DC circuit breaker from overvoltage breakdown due to faults.

[0052] In one embodiment, such as Figure 2 As shown, the backup turn-on branch 2 includes a monostable multivibrator 21 and a second turn-on branch 22. The first input terminal of the monostable multivibrator 21 is connected to the second output terminal of the control circuit 3. The second input terminal of the monostable multivibrator 21 is connected to an external driving power supply. The first output terminal of the monostable multivibrator 21 is connected to the input terminal of the second turn-on branch 22. The output terminal of the second turn-on branch 22 is connected to the gate of the target IGBT.

[0053] In one specific embodiment, when the control circuit 3 is operating normally, the frequency of the high-frequency square wave control signal output by the control circuit 3 is f, and the period is T, where T = 1 / f. The output pulse width of the monostable multivibrator 21 is greater than the period of the second control signal (i.e., the high-frequency square wave control signal). That is, the output pulse width of the monostable multivibrator is greater than 1 / f. In this embodiment of the invention, f = 10kHz; this is merely an example and not a limitation.

[0054] In this embodiment of the invention, the key waveform for reliable activation is as follows: Figure 3As shown. Under normal conditions, the backup control signal output by control circuit 3 is a square wave with a frequency of f. Since the pulse width of the monostable trigger 21 in backup turn-on branch 2 is greater than 1 / f, the output of backup turn-on branch 2 can always be maintained in a metastable state, i.e., a low level. The output of the second turn-on branch 22 is zero voltage, and the IGBT is controlled by the normal drive branch 1.

[0055] Furthermore, when the control circuit 3 experiences communication loss or abnormality, or when the drive power supply VCC1 is undervoltage, the backup control signal output by the control circuit 3 remains at a high level. The monostable trigger 21 in the backup turn-on branch 2 becomes unable to maintain a metastable state and changes to an output steady state, i.e., a high level, while the second turn-on branch 22 outputs a turn-on voltage. At this time, regardless of the output state of the normal drive branch 1, the gate of the IGBT is turned on by applying a positive voltage.

[0056] Specifically, when the control circuit 3 fails or crashes, it outputs a single level (high level or low level). The monostable trigger 21 of the backup turn-on branch 2 also cannot maintain the metastable state and outputs a steady-state high level. The second turn-on branch 22 outputs the turn-on voltage, and the IGBT turns on.

[0057] In one embodiment, such as Figure 2 As shown, the normal drive branch 1 includes a first turn-on branch 11 and a first turn-off branch 12, wherein the first turn-on branch 11 controls the target IGBT to turn on according to a first control signal; and the first turn-off branch 12 controls the target IGBT to turn off according to the first control signal.

[0058] In one specific embodiment, the normal drive branch 1 is the same as a conventional driver, receiving the first control signal from the control circuit 3 and converting it into a gate power signal that can drive the IGBT to turn it on or off.

[0059] In one embodiment, such as Figure 2 As shown, the reliable IGBT conduction circuit further includes: a first diode D1 and a second diode D2, wherein the anode of the first diode D1 is connected to the output terminal of the first turn-on branch 11, and the cathode of the first diode D1 is connected to the gate of the target IGBT; the anode of the second diode D2 is connected to the output terminal of the second turn-on branch 22, and the cathode of the second diode D2 is connected to the gate of the target IGBT.

[0060] In one specific embodiment, both the first diode D1 and the second diode D2 serve to reverse-block. By setting the first diode D1 and the second diode D2, the normal drive branch 1 and the backup turn-on branch 2 will not affect each other, and the positive turn-on voltage output by either branch will be applied to the IGBT gate to turn it on without affecting the other branch.

[0061] In one embodiment, such as Figure 2As shown, the IGBT reliable conduction circuit also includes: a drive power supply device 4, the first transmission line of the drive power supply device 4 is connected to the first input terminal of the normal drive branch 1, and the second transmission line of the drive power supply device 4 is connected to the first input terminal of the backup turn-on branch 2.

[0062] In one specific embodiment, VCC1 and VCC2 are two independent voltages output by the drive power supply device 4. VCC1 supplies power to the normal drive branch 1, and VCC2 supplies power to the backup power-on branch 2. The two drive power supplies are independent of each other, and a voltage drop in one power supply due to overload or short circuit will not affect the output of the other power supply.

[0063] This invention also provides a driver, including the above-described IGBT reliable conduction circuit.

[0064] In one specific embodiment, by employing the above-described IGBT reliable conduction circuit, the driver can ensure that the IGBT remains in a conducting state in the event of communication loss or abnormality, undervoltage of the drive power supply, or failure of the control chip.

[0065] This invention also provides a reliable IGBT turn-on method. Based on the above-described reliable IGBT turn-on circuit, the reliable IGBT turn-on method is as follows: Figure 4 As shown, it includes the following steps:

[0066] Step S1: Monitor the operating status of the control circuit.

[0067] Step S2: When the control circuit is working normally, acquire the first control signal and the second control signal output by the control circuit, drive the normal drive branch to work according to the first control signal, and then control the target IGBT to turn on or off. At the same time, cut off the backup turn-on branch according to the second control signal.

[0068] Step S3: When the control circuit malfunctions, acquire the continuous single-level control signal output by the control circuit, drive the backup turn-on branch to work according to the continuous single-level control signal, and then control the target IGBT to turn on.

[0069] In one specific embodiment, when the control circuit 3 is operating normally, it outputs a first control signal to the normal drive branch 1. The normal drive branch 1 controls the target IGBT to turn on or off according to the first control signal. Simultaneously, the control circuit outputs a second control signal to the backup turn-on branch 2, which outputs zero voltage according to the second control signal. When the control circuit 3 malfunctions, it outputs a third control signal to the normal drive branch 1, which operates according to the third control signal. Simultaneously, the control circuit 3 outputs a continuous single-level control signal to the backup turn-on branch 2, which controls the target IGBT to turn on according to the continuous single-level control signal.

[0070] In this embodiment of the invention, the first control signal is the normal control signal of the IGBT, and its duty cycle is adjusted according to actual needs. The second control signal is a high-frequency square wave signal, and its period is set according to the internal parameters of the backup turn-on branch 2, ensuring that the backup turn-on branch 2 outputs zero voltage after receiving the second control signal. The third control signal is not limited here, because at this time, regardless of the output state of the normal drive branch 1, the target IGBT will be turned on by the backup turn-on branch 2 applying a positive voltage.

[0071] Specifically, the normal drive branch 1 receives the first control signal sent by the control circuit 3 and converts it into a gate power signal that can drive the target IGBT to turn it on or off. The backup turn-on branch 2 receives the backup control signal output by the control circuit 3. If the backup control signal is a high-frequency square wave, the backup turn-on branch 2 outputs zero voltage. If the backup control signal is continuously at a single level (high level or low level), the backup turn-on branch 2 outputs a positive turn-on voltage to control the target IGBT to turn on.

[0072] Under normal conditions, the backup control signal output by control circuit 3 is a high-frequency square wave, and the backup turn-on branch 2 outputs zero voltage, so the IGBT is controlled by the normal drive branch 1. However, under abnormal conditions, the backup signal output by control circuit 3 remains at a single level, and the backup turn-on branch 2 outputs a turn-on voltage. At this time, regardless of the output state of the normal drive branch 1, the gate of the target IGBT is turned on by applying a positive voltage.

[0073] In one embodiment, under normal conditions, the backup control signal output by the control circuit 3 is a square wave with a frequency of f. Since the pulse width of the monostable trigger 21 in the backup turn-on branch 2 is greater than 1 / f, the output of the backup turn-on branch 2 can always be maintained in a metastable state, i.e., a low level. The second turn-on branch 22 outputs zero voltage, and the IGBT is controlled by the normal drive branch 1.

[0074] Furthermore, when the control circuit 3 experiences communication loss or abnormality, or when the drive power supply VCC1 is undervoltage, the backup control signal output by the control circuit 3 remains at a high level. The monostable trigger 21 in the backup turn-on branch 2 becomes unable to maintain a metastable state and changes to an output steady state, i.e., a high level, while the second turn-on branch 22 outputs a turn-on voltage. At this time, regardless of the output state of the normal drive branch 1, the gate of the IGBT is turned on by applying a positive voltage.

[0075] Specifically, when the control circuit 3 fails or crashes, it outputs a single level (high level or low level). The monostable trigger 21 of the backup turn-on branch 2 also cannot maintain the metastable state and outputs a steady-state high level. The second turn-on branch 22 outputs the turn-on voltage, and the IGBT turns on.

[0076] This invention provides a reliable IGBT turn-on method, comprising: monitoring the operating status of a control circuit; when the control circuit is operating normally, acquiring a first control signal and a second control signal output by the control circuit, driving the normal drive branch to operate according to the first control signal, thereby controlling the target IGBT to turn on or off, and simultaneously cutting off the backup turn-on branch according to the second control signal; when the control circuit is operating abnormally, acquiring a continuous single-level control signal output by the control circuit, driving the backup turn-on branch to operate according to the continuous single-level control signal, thereby controlling the target IGBT to turn on. In the event of a control circuit malfunction, the target IGBT is turned on according to the continuous single-level control signal sent by the malfunctioning control circuit, thereby ensuring that the IGBT remains in the conducting state even in situations such as communication loss or abnormality in the control circuit, undervoltage of the drive power supply, or failure of the control chip. This effectively protects the IGBTs in hybrid high-voltage DC circuit breakers from overvoltage breakdown due to faults.

[0077] This invention provides a computer device, such as... Figure 5 As shown, the device may include a processor 81 and a memory 82, wherein the processor 81 and the memory 82 may be connected via a bus or other means. Figure 5 Take a bus connection as an example.

[0078] Processor 81 can be a central processing unit (CPU). Processor 81 can also be other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, or combinations of the above types of chips.

[0079] The memory 82, as a non-transitory computer-readable storage medium, can be used to store non-transitory software programs, non-transitory computer-executable programs, and modules, such as the corresponding program instructions / modules in the embodiments of the present invention. The processor 81 executes various functional applications and data processing of the processor by running the non-transitory software programs, instructions, and modules stored in the memory 82, thereby realizing the reliable IGBT conduction method in the above method embodiments.

[0080] The memory 82 may include a program storage area and a data storage area. The program storage area may store the operating system and applications required for at least one function; the data storage area may store data created by the processor 81, etc. Furthermore, the memory 82 may include high-speed random access memory and may also include non-transitory memory, such as at least one disk storage device, flash memory device, or other non-transitory solid-state storage device. In some embodiments, the memory 82 may optionally include memory remotely located relative to the processor 81, and these remote memories may be connected to the processor 81 via a network. Examples of such networks include, but are not limited to, the Internet, corporate intranets, mobile communication networks, and combinations thereof.

[0081] One or more modules are stored in memory 82, and when executed by processor 81, they perform actions such as... Figure 4 The IGBT reliable conduction method in the illustrated embodiment.

[0082] For specific details regarding the aforementioned computer equipment, please refer to the relevant documentation. Figures 1-4 The relevant descriptions and effects in the illustrated embodiments are for understanding purposes only and will not be repeated here.

[0083] Those skilled in the art will understand that all or part of the processes in the methods of the above embodiments can be implemented by a computer program instructing related hardware. The program can be stored in a computer-readable storage medium, and when executed, it can include the processes of the embodiments of the above methods. The storage medium can be a magnetic disk, optical disk, read-only memory (ROM), random access memory (RAM), flash memory, hard disk drive (HDD), or solid-state drive (SSD), etc.; the storage medium can also include combinations of the above types of memory.

[0084] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A reliable IGBT turn-on circuit, characterized in that, include: The circuit includes a normal drive branch, a backup power-on branch, and a control circuit. The first input terminal of the normal drive branch is connected to the first output terminal of the control circuit, the second input terminal of the normal drive branch is connected to an external drive power supply, and the first output terminal of the normal drive branch is connected to the gate of the target IGBT. The first input terminal of the backup power-on branch is connected to the second output terminal of the control circuit, the second input terminal of the backup power-on branch is connected to an external driving power supply, and the first output terminal of the backup power-on branch is connected to the gate of the target IGBT. When the control circuit is working normally, the control circuit outputs a first control signal to the normal drive branch, and the normal drive branch controls the target IGBT to turn on or off according to the first control signal. At the same time, the control circuit outputs a second control signal to the backup turn-on branch, and the backup turn-on branch outputs zero voltage according to the second control signal. When the control circuit malfunctions, the control circuit outputs a third control signal to the normal drive branch, and the normal drive branch operates according to the third control signal. At the same time, the control circuit outputs a continuous single-level control signal to the backup turn-on branch, and the backup turn-on branch controls the target IGBT to turn on according to the continuous single-level control signal. The backup activation branch includes: a monostable multivibrator and a second activation branch, wherein, The first input terminal of the monostable multivibrator is connected to the second output terminal of the control circuit. The second input terminal of the monostable multivibrator is connected to an external driving power supply. The first output terminal of the monostable multivibrator is connected to the input terminal of the second turn-on branch. The output terminal of the second turn-on branch is connected to the gate of the target IGBT. The output pulse width of the monostable trigger is greater than the period of the second control signal.

2. The IGBT reliable conduction circuit according to claim 1, characterized in that, Also includes: A drive power supply device, wherein the first transmission line of the drive power supply device is connected to the first input terminal of the normal drive branch, and the second transmission line of the drive power supply device is connected to the first input terminal of the backup activation branch.

3. The IGBT reliable conduction circuit according to claim 1, characterized in that, The normal drive branch includes: a first turn-on branch and a first turn-off branch, wherein... The first activation branch activates the target IGBT according to the first control signal; The first shutdown branch controls the target IGBT to shut down according to the first control signal.

4. The IGBT reliable conduction circuit according to claim 3, characterized in that, Also includes: The first diode and the second diode, wherein... The anode of the first diode is connected to the output terminal of the first open branch, and the cathode of the first diode is connected to the gate of the target IGBT. The anode of the second diode is connected to the output terminal of the second open branch, and the cathode of the second diode is connected to the gate of the target IGBT.

5. A driver, characterized in that, include: The reliable IGBT conduction circuit according to any one of claims 1-4.

6. A reliable IGBT turn-on method, characterized in that, Based on the IGBT reliable turn-on circuit according to any one of claims 1-4, the IGBT reliable turn-on method includes: Monitor the operating status of the control circuit; When the control circuit is working normally, the first control signal and the second control signal output by the control circuit are acquired. The normal drive branch is driven to work according to the first control signal, thereby controlling the target IGBT to turn on or off. At the same time, the backup turn-on branch is cut off according to the second control signal. When the control circuit malfunctions, a continuous single-level control signal output by the control circuit is acquired, and the backup turn-on branch is driven to work according to the continuous single-level control signal, thereby controlling the target IGBT to turn on.

7. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores computer instructions for causing the computer to perform the IGBT reliable turn-on method as described in claim 6.

8. A computer device, characterized in that, include: The system includes a memory and a processor, which are communicatively connected to each other. The memory stores computer instructions, and the processor executes the computer instructions to perform the IGBT reliable turn-on method as described in claim 6.

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