Method, device and equipment for identifying component fault status in half-bridge power module

Abstract

The present invention relates to a method, device and equipment for identifying the fault status of components in a half-bridge power module. The method obtains the main circuit current, bypass thyristor branch current and lower IGBT and anti-parallel diode branch current of the half-bridge power module with a port short-circuited after the fault through a test module, and determines that the state of the bypass thyristor and / or lower IGBT and anti-parallel diode branch of the half-bridge power module is a short-circuit fault state based on the main circuit current, bypass thyristor branch current and lower IGBT and anti-parallel diode branch current; the test module can be used to determine which electronic component in the half-bridge power module has a short-circuit fault at the project site, without having to send the half-bridge power module back to the original factory for dissection and testing to determine which electronic component has failed. This solves the problem that the fault identification can only be carried out after the faulty half-bridge power module has been disassembled using special disassembly equipment, which delays the progress of fault investigation.

Description

Technical Field

[0001] The present invention relates to the technical field of power module fault identification, and in particular to a method, device and equipment for identifying the fault status of components in a half-bridge power module. Background Art

[0002] In a converter valve, if a half-bridge module experiences a short-circuit fault, it's crucial to quickly identify the faulty component or parts within the module. Because the bypass thyristor, lower IGBT, and anti-parallel diode in a half-bridge module are connected in parallel, and structurally, these components are tightly crimped to the water-cooled heat sink and insulation crimping assembly, forming a single unit, measuring the module's port impedance without disassembling it is impossible to determine the fault status of the bypass thyristor, lower IGBT, or anti-parallel diode.

[0003] Special crimping equipment is required to disassemble the crimping components of the half-bridge module. This type of crimping equipment is only specially equipped in the production workshop of the converter valve manufacturer, and there is no special equipment on the project site. Therefore, in this case, the faulty half-bridge module of the converter valve can only be transported from the project site to the manufacturer, and then the half-bridge module is disassembled in the factory using special crimping equipment to obtain a single bypass thyristor, lower IGBT and anti-parallel diode. Then, a high-precision impedance tester is used to perform port impedance testing on the single bypass thyristor, lower IGBT and anti-parallel diode, so as to determine the fault status of the bypass thyristor, lower IGBT and anti-parallel diode. This method takes a long time to identify the faulty half-bridge module of the converter valve, and special crimping equipment is required to disassemble the half-bridge module, which delays the progress of fault investigation. Summary of the Invention

[0004] Embodiments of the present invention provide a method, device, and apparatus for identifying the fault status of components within a half-bridge power module, which are used to solve the technical problem that the fault can only be identified after the faulty half-bridge power module has been disassembled using dedicated disassembly equipment. This method takes a long time to identify the fault, which delays the progress of fault investigation.

[0005] In order to achieve the above objectives, the embodiments of the present invention provide the following technical solutions:

[0006] A method for identifying a component fault state in a half-bridge power module is applied to a test system for the component fault state in the half-bridge power module. The method comprises the following steps:

[0007] Acquire a half-bridge power module whose port is in a short-circuit state after a fault, and determine a state of its bypass switch according to the half-bridge power module;

[0008] If the bypass switch state of the half-bridge power module is in the off state, the half-bridge power module is connected in series with a test module, and the currents of the main circuit, the bypass thyristor branch, and the lower IGBT and anti-parallel diode branch of the half-bridge power module in a stable state are measured by the test module to obtain the main circuit current, the bypass thyristor branch current, and the lower IGBT and anti-parallel diode branch current;

[0009] Determining that the state of the bypass thyristor and / or the lower IGBT and anti-parallel diode branch of the half-bridge power module is a short-circuit fault state according to the main loop current, the bypass thyristor branch current, and the lower IGBT and anti-parallel diode branch current;

[0010] Among them, the test module includes a first current transformer, a second current transformer, a third current transformer and a current limiting resistor, and the half-bridge power module includes a main circuit connection end, a second connection end, a bypass thyristor branch, a lower tube IGBT and an anti-parallel diode branch. The main circuit connection end is connected to the first current transformer, the second connection end is connected to the current limiting resistor, the bypass thyristor branch is connected to the second current transformer, and the lower tube IGBT and the anti-parallel diode branch are connected to the third current transformer.

[0011] Preferably, measuring the currents of the main circuit, the bypass thyristor branch, the lower IGBT, and the anti-parallel diode branch of the half-bridge power module in a stable state by the test module includes:

[0012] Closing the switch element of the test module, and adjusting the voltage provided by the test module to the half-bridge power module from 0 until the main loop current of the half-bridge power module is in a stable state;

[0013] When the main circuit current of the half-bridge power module is in a stable state, the currents of the main circuit, bypass thyristor branch, lower IGBT and anti-parallel diode branch of the half-bridge power module are detected by the first current transformer, the second current transformer and the third current transformer to obtain the main circuit current, bypass thyristor branch current and lower IGBT and anti-parallel diode branch current of the half-bridge power module.

[0014] Preferably, determining that the state of the bypass thyristor and / or the lower IGBT and anti-parallel diode branch of the half-bridge power module is a short-circuit fault state according to the main circuit current, the bypass thyristor branch current, and the lower IGBT and anti-parallel diode branch current includes:

[0015] If the values ​​of the main circuit current, the bypass thyristor branch current, and the lower IGBT and anti-parallel diode branch current are in the ampere level, and the value of the main circuit current is equal to the sum of the values ​​of the bypass thyristor branch current and the lower IGBT and anti-parallel diode branch current, then the bypass thyristor and lower IGBT and anti-parallel diode branches of the half-bridge power module are all in a short-circuit fault state;

[0016] If the main circuit current is equal to the current of the lower IGBT and anti-parallel diode branch, and the bypass thyristor branch current is in the milliampere or microampere level, the bypass thyristor of the half-bridge power module is in a normal state, and the lower IGBT and anti-parallel diode branch of the half-bridge power module are in a short-circuit fault state;

[0017] If the main circuit current is equal to the value of the bypass thyristor branch current, and the value of the lower IGBT and anti-parallel diode branch current is in the milliampere or microampere level, the state of the bypass thyristor of the half-bridge power module is a short-circuit fault state, and the state of the lower IGBT and anti-parallel diode branch of the half-bridge power module is normal.

[0018] Preferably, the method for identifying the fault status of components in the half-bridge power module includes: after determining the fault status of the bypass thyristor and / or lower tube IGBT and anti-parallel diode branch of the half-bridge power module, adjusting the voltage provided by the test module to the half-bridge power module to 0, and disconnecting the switching element of the test module.

[0019] Preferably, the method for identifying the fault status of a component in the half-bridge power module includes: if the bypass switch state of the half-bridge power module is in a closed state, controlling the bypass switch of the half-bridge power module to be opened so that the bypass switch state of the half-bridge power module is in an open state.

[0020] The present invention also provides a device for identifying the fault status of components in a half-bridge power module, which is used in a test system for the fault status of components in a half-bridge power module. The device comprises: a switch state acquisition module, a current data measurement module and an identification module;

[0021] The switch state acquisition module is used to acquire a half-bridge power module whose port is in a short-circuit state after a fault, and determine the state of its bypass switch according to the half-bridge power module;

[0022] The current data measurement module is configured to connect the half-bridge power module in series with a test module based on the bypass switch state of the half-bridge power module being in an off state, and measure the currents of the main circuit, the bypass thyristor branch, and the lower IGBT and anti-parallel diode branch of the half-bridge power module in a stable state through the test module to obtain the main circuit current, the bypass thyristor branch current, and the lower IGBT and anti-parallel diode branch current;

[0023] The identification module is configured to determine whether the state of the bypass thyristor and / or the lower IGBT and anti-parallel diode branch of the half-bridge power module is a short-circuit fault state according to the main loop current, the bypass thyristor branch current, and the lower IGBT and anti-parallel diode branch current;

[0024] Among them, the test module includes a first current transformer, a second current transformer, a third current transformer and a current limiting resistor, and the half-bridge power module includes a main circuit connection end, a second connection end, a bypass thyristor branch, a lower tube IGBT and an anti-parallel diode branch. The main circuit connection end is connected to the first current transformer, the second connection end is connected to the current limiting resistor, the bypass thyristor branch is connected to the second current transformer, and the lower tube IGBT and the anti-parallel diode branch are connected to the third current transformer.

[0025] Preferably, the current data measurement module includes a regulating submodule and a measuring submodule:

[0026] The regulating submodule is configured to close the switch element of the test module and regulate the voltage provided by the test module to the half-bridge power module from 0 until the main loop current of the half-bridge power module is in a stable state;

[0027] The measurement submodule is used to detect the currents of the main circuit, bypass thyristor branch, lower IGBT and anti-parallel diode branch of the half-bridge power module through the first current transformer, the second current transformer and the third current transformer when the main circuit current of the half-bridge power module is in a stable state, and obtain the main circuit current, bypass thyristor branch current and lower IGBT and anti-parallel diode branch current of the half-bridge power module.

[0028] Preferably, the identification module includes a first identification submodule, a second identification submodule and a third identification submodule:

[0029] The first identification submodule is configured to determine, based on the values ​​of the main circuit current, the bypass thyristor branch current, and the lower IGBT and anti-parallel diode branch current being in the ampere level, and the value of the main circuit current being equal to the sum of the values ​​of the bypass thyristor branch current and the lower IGBT and anti-parallel diode branch current, that the states of the bypass thyristor, lower IGBT, and anti-parallel diode branch of the half-bridge power module are all in a short-circuit fault state;

[0030] The second identification submodule is configured to determine, based on the values ​​of the main loop current and the lower IGBT and anti-parallel diode branch current being equal, and the value of the bypass thyristor branch current being in the milliampere level or the microampere level, that the state of the bypass thyristor of the half-bridge power module is normal, and the state of the lower IGBT and anti-parallel diode branch of the half-bridge power module is in the short-circuit fault state;

[0031] The third identification submodule is used to determine that, based on the values ​​of the main loop current and the bypass thyristor branch current being equal, and the values ​​of the lower IGBT and anti-parallel diode branch current being in the milliampere or microampere level, the state of the bypass thyristor of the half-bridge power module is a short-circuit fault state, and the state of the lower IGBT and anti-parallel diode branch of the half-bridge power module is normal.

[0032] Preferably, the switch state acquisition module is further used to control the bypass switch of the half-bridge power module to be opened according to the bypass switch state of the half-bridge power module being in the closed state, so that the bypass switch state of the half-bridge power module is in the open state.

[0033] The present invention also provides a terminal device, comprising a processor and a memory;

[0034] The memory is used to store program code and transmit the program code to the processor;

[0035] The processor is configured to execute the above-mentioned method for identifying the fault status of components in a half-bridge power module according to instructions in the program code.

[0036] It can be seen from the above technical solution that the embodiments of the present invention have the following advantages: a method, device and equipment for identifying the fault status of components in a half-bridge power module, the method comprising obtaining a half-bridge power module whose port is in a short-circuit state after the fault, and determining the state of its bypass switch according to the half-bridge power module; if the bypass switch state of the half-bridge power module is in a disconnected state, connecting the half-bridge power module in series with a test module, and measuring the current of the main circuit, bypass thyristor branch and lower IGBT and anti-parallel diode branch of the half-bridge power module in a stable state through the test module to obtain the main circuit current, bypass thyristor branch current and lower IGBT and anti-parallel diode branch current; and determining that the state of the bypass thyristor and / or lower IGBT and anti-parallel diode branch of the half-bridge power module is a short-circuit fault state according to the main circuit current, bypass thyristor branch current and lower IGBT and anti-parallel diode branch current. The method for identifying the fault status of components in a half-bridge power module obtains the main circuit current, bypass thyristor branch current, and lower tube IGBT and anti-parallel diode branch current of the half-bridge power module that has a short-circuit fault through a test module, and determines that the status of the bypass thyristor and / or lower tube IGBT and anti-parallel diode branch of the half-bridge power module is a short-circuit fault state based on the main circuit current, bypass thyristor branch current, and lower tube IGBT and anti-parallel diode branch current. A simple test module can be used to determine which electronic component in the half-bridge power module has a short-circuit fault at the project site, and there is no need to send the half-bridge power module back to the original factory for dissection and testing to determine which electronic component has failed. This avoids the problem of delayed accident investigation progress due to a long time, and solves the technical problem that the existing method requires special disassembly equipment to disassemble the faulty half-bridge power module before the fault can be identified, and this method takes a long time to identify the fault, which delays the progress of fault investigation. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0038] Figure 1 This is a flowchart of the steps of a method for identifying a fault state of a component in a half-bridge power module according to an embodiment of the present invention;

[0039] Figure 2 This is a circuit schematic diagram of a test system for a method for identifying component fault status in a half-bridge power module according to an embodiment of the present invention. DETAILED DESCRIPTION

[0040] In order to make the purpose, features, and advantages of the present invention more obvious and easy to understand, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described below are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0041] The embodiments of the present application provide a method, device and equipment for identifying the fault status of components in a half-bridge power module, which are applied to a test system for the fault status of components in a half-bridge power module. It is used to solve the technical problem that in the existing method, special disassembly equipment is required to disassemble the faulty half-bridge power module before the fault can be identified. This method takes a long time to identify the fault, which delays the progress of fault investigation.

[0042] Example 1:

[0043] Figure 1 Schematic diagram of the steps of a method for identifying a fault state of a component in a half-bridge power module according to an embodiment of the present invention. Figure 2 This is a circuit schematic diagram of a test system for a method for identifying component fault status in a half-bridge power module according to an embodiment of the present invention.

[0044] like Figure 1 and Figure 2 As shown, the present invention provides a method for identifying a fault state of a component in a half-bridge power module, which is applied to a test system for the fault state of a component in a half-bridge power module. The method for identifying a fault state of a component in a half-bridge power module comprises the following steps:

[0045] S1. Obtain a half-bridge power module whose port is in a short-circuit state after a fault, and determine the state of its bypass switch based on the half-bridge power module.

[0046] It should be noted that in step S1, a half-bridge power module with a short-circuited port after a fault may be obtained from the construction site. The construction site operator can visually or with tools inspect the bypass switch status of the half-bridge power module to determine the bypass switch status. Step S2 is performed only if the bypass switch of the half-bridge power module is disconnected.

[0047] In an embodiment of the present invention, if the bypass switch state determined by the half-bridge power module is closed, the bypass switch of the half-bridge power module can be manually or automatically controlled to open so that the bypass switch state of the half-bridge power module is open.

[0048] S2. If the bypass switch state of the half-bridge power module is disconnected, connect the half-bridge power module in series with the test module, and use the test module to measure the currents of the main circuit, bypass thyristor branch, lower IGBT, and anti-parallel diode branch of the half-bridge power module in the stable state to obtain the main circuit current, bypass thyristor branch current, and lower IGBT and anti-parallel diode branch current.

[0049] It should be noted that in step S2, the currents of the main circuit, bypass thyristor branch, lower IGBT and anti-parallel diode branch of the half-bridge power module with a short circuit fault can be measured by the test module.

[0050] In the embodiment of the present invention, Figure 2 As shown, the test module includes an adjustable DC voltage source U S , switching element K, first current transformer CT1, second current transformer CT2, third current transformer CT3, and current-limiting resistor R0. The half-bridge power module includes a main circuit connection terminal 1, a second connection terminal 2, a bypass thyristor branch 3, and a lower IGBT and anti-parallel diode branch 4. The main circuit connection terminal 1 is connected to the first current transformer CT1, the second connection terminal 2 is connected to the current-limiting resistor R0, the bypass thyristor branch 3 is connected to the second current transformer CT2, and the lower IGBT and anti-parallel diode branch 4 are connected to the third current transformer CT3. Adjustable DC voltage source U S The positive electrode is connected to the first end of the switch element K, the second end of the switch element K is connected to the first current transformer CT1, and the adjustable DC voltage source U S The negative electrode is connected to the current limiting resistor R0.

[0051] It should be noted that the switch element K can be a circuit breaker, the bypass thyristor branch 3 is the branch of the bypass thyristor in the half-bridge power module, and the lower IGBT and anti-parallel diode branch 4 is the branch of the lower IGBT and anti-parallel diode in the half-bridge power module. In this embodiment, the first current transformer CT1 measures the current I1 of the main circuit of the half-bridge power module, the second current transformer CT2 measures the current I2 of the bypass thyristor branch of the half-bridge power module, and the third current transformer CT3 measures the current I3 of the lower IGBT and anti-parallel diode branch. The positive direction of the test current is as follows: Figure 2 As shown. Connect the half-bridge power module and the test module in series, then close the switching element K and adjust the DC voltage source U from 0. S The voltage value is adjusted until the main circuit current I1 stabilizes at about tens of amperes. After the main circuit current I1 of the half-bridge power module to be measured stabilizes (will not jump greatly), the current sizes of I1, I2, and I3 are measured by the first current transformer CT1, the second current transformer CT2, and the third current transformer CT3.

[0052] S3. Determine that the bypass thyristor and / or the lower IGBT and anti-parallel diode branch of the half-bridge power module are in a short-circuit fault state based on the main circuit current, the bypass thyristor branch current, and the lower IGBT and anti-parallel diode branch current.

[0053] It should be noted that in step S3, the state of the bypass thyristor and / or the lower IGBT and anti-parallel diode branch of the half-bridge power module can be judged to be a short-circuit fault state through the current values ​​of the main circuit current, the bypass thyristor branch current and the lower IGBT and anti-parallel diode branch current, so that the method for identifying the fault state of the components in the half-bridge power module can use a simple test module to determine which electronic component inside the half-bridge power module has a short-circuit fault at the engineering site.

[0054] The present invention provides a method for identifying a fault state of a component in a half-bridge power module, comprising: obtaining a half-bridge power module whose port is in a short-circuit state after a fault, and determining the state of its bypass switch based on the half-bridge power module; if the bypass switch state of the half-bridge power module is in an open state, connecting the half-bridge power module in series with a test module, measuring the currents of a main circuit, a bypass thyristor branch, a lower IGBT, and an anti-parallel diode branch of the half-bridge power module in a stable state through the test module, and obtaining the main circuit current, the bypass thyristor branch current, and the lower IGBT and anti-parallel diode branch current; and determining that the state of the bypass thyristor and / or the lower IGBT and anti-parallel diode branch of the half-bridge power module is a short-circuit fault state based on the main circuit current, the bypass thyristor branch current, and the lower IGBT and anti-parallel diode branch current. The method for identifying the fault status of components in a half-bridge power module obtains the main circuit current, bypass thyristor branch current, and lower tube IGBT and anti-parallel diode branch current of the half-bridge power module that has a short-circuit fault through a test module, and determines that the status of the bypass thyristor and / or lower tube IGBT and anti-parallel diode branch of the half-bridge power module is a short-circuit fault state based on the main circuit current, bypass thyristor branch current, and lower tube IGBT and anti-parallel diode branch current. A simple test module can be used to determine which electronic component in the half-bridge power module has a short-circuit fault at the project site, and there is no need to send the half-bridge power module back to the original factory for dissection and testing to determine which electronic component has failed. This avoids the problem of delayed accident investigation progress due to a long time, and solves the technical problem that the existing method requires special disassembly equipment to disassemble the faulty half-bridge power module before the fault can be identified, and this method takes a long time to identify the fault, which delays the progress of fault investigation.

[0055] In one embodiment of the present invention, measuring the currents of the main circuit, the bypass thyristor branch, the lower IGBT, and the anti-parallel diode branch of the half-bridge power module in a stable state by the test module includes:

[0056] Close the switch element of the test module and adjust the voltage provided by the test module to the half-bridge power module from 0 until the main circuit current of the half-bridge power module is in a stable state;

[0057] When the main circuit current of the half-bridge power module is in a stable state, the currents of the main circuit, bypass thyristor branch, lower IGBT and anti-parallel diode branch of the half-bridge power module are detected by the first current transformer, the second current transformer and the third current transformer to obtain the main circuit current, bypass thyristor branch current and lower IGBT and anti-parallel diode branch current of the half-bridge power module.

[0058] It should be noted that only when the main circuit current of the half-bridge power module is in a stable state can the current detected by the measurement module be used to identify whether the bypass thyristor and / or lower IGBT and anti-parallel diode branch of the half-bridge power module are in a short-circuit fault state.

[0059] In one embodiment of the present invention, determining that the bypass thyristor and / or the lower IGBT and anti-parallel diode branch of the half-bridge power module is in a short-circuit fault state according to the main circuit current, the bypass thyristor branch current, and the lower IGBT and anti-parallel diode branch current includes:

[0060] If the values ​​of the main circuit current, bypass thyristor branch current, and lower IGBT and anti-parallel diode branch current are in the ampere level, and the value of the main circuit current is equal to the sum of the bypass thyristor branch current and the lower IGBT and anti-parallel diode branch current, then the bypass thyristor, lower IGBT, and anti-parallel diode branch of the half-bridge power module are all in a short-circuit fault state;

[0061] If the main circuit current is equal to the current of the lower IGBT and anti-parallel diode branch, and the bypass thyristor branch current is in the milliampere or microampere level, the bypass thyristor of the half-bridge power module is in normal condition, and the lower IGBT and anti-parallel diode branch of the half-bridge power module is in a short-circuit fault state.

[0062] If the main circuit current is equal to the bypass thyristor branch current, and the lower IGBT and anti-parallel diode branch currents are in the milliampere or microampere range, the bypass thyristor of the half-bridge power module is in a short-circuit fault state, and the lower IGBT and anti-parallel diode branch of the half-bridge power module are in normal state.

[0063] It should be noted that the ampere level refers to the absolute value of the current value being not less than 0.1A, the milliampere level refers to the absolute value of the current value being less than 0.1A and not less than 0.1mA, and the microampere level refers to the absolute value of the current value being less than 0.1mA and not less than 0.1uA.

[0064] In one embodiment of the present invention, the method for identifying the fault status of components in the half-bridge power module includes: after determining the fault status of the bypass thyristor and / or the lower IGBT and the anti-parallel diode branch of the half-bridge power module, adjusting the voltage provided by the test module to the half-bridge power module to 0, and disconnecting the switching element of the test module.

[0065] It should be noted that after identifying whether the bypass thyristor and / or the lower IGBT and the anti-parallel diode branch of the half-bridge power module have a short circuit fault, the DC voltage source U is adjusted in a decreasing manner. S Output power supply voltage, until the DC voltage source U S The output power supply voltage is 0, and the switch element K of the test module is disconnected.

[0066] Example 2:

[0067] The present invention also provides a device for identifying the fault status of components in a half-bridge power module, which is applied to a test system for the fault status of components in a half-bridge power module. The device includes a switch state acquisition module, a current data measurement module, and an identification module.

[0068] A switch status acquisition module is used to acquire a half-bridge power module whose port is in a short-circuit state after a fault, and determine the state of its bypass switch according to the half-bridge power module;

[0069] A current data measurement module is used to connect the half-bridge power module in series with the test module according to the bypass switch state of the half-bridge power module being in the disconnected state, and measure the currents of the main circuit, bypass thyristor branch, lower IGBT and anti-parallel diode branch of the half-bridge power module in a stable state through the test module to obtain the main circuit current, bypass thyristor branch current, and lower IGBT and anti-parallel diode branch current;

[0070] an identification module, configured to determine whether the bypass thyristor and / or the lower IGBT and anti-parallel diode branch of the half-bridge power module is in a short-circuit fault state based on the main circuit current, the bypass thyristor branch current, and the lower IGBT and anti-parallel diode branch current;

[0071] Among them, the test module includes a first current transformer, a second current transformer, a third current transformer and a current limiting resistor, and the half-bridge power module includes a main circuit connection end, a second connection end, a bypass thyristor branch, a lower tube IGBT and an anti-parallel diode branch. The main circuit connection end is connected to the first current transformer, the second connection end is connected to the current limiting resistor, the bypass thyristor branch is connected to the second current transformer, and the lower tube IGBT and the anti-parallel diode branch are connected to the third current transformer.

[0072] In an embodiment of the present invention, the current data measurement module includes a regulating submodule and a measuring submodule;

[0073] The regulating submodule is used to close the switch element of the test module and adjust the voltage provided by the test module to the half-bridge power module from 0 until the main loop current of the half-bridge power module is in a stable state;

[0074] The measurement submodule is used to detect the currents of the main circuit, bypass thyristor branch, lower IGBT and anti-parallel diode branch of the half-bridge power module through the first current transformer, the second current transformer and the third current transformer when the main circuit current of the half-bridge power module is in a stable state, and obtain the main circuit current, bypass thyristor branch current and lower IGBT and anti-parallel diode branch current of the half-bridge power module.

[0075] In an embodiment of the present invention, the identification module includes a first identification submodule, a second identification submodule and a third identification submodule;

[0076] The first identification submodule is used to determine that the bypass thyristor, the lower IGBT, and the anti-parallel diode branch of the half-bridge power module are in a short-circuit fault state based on the values ​​of the main circuit current, the bypass thyristor branch current, and the lower IGBT and anti-parallel diode branch current being in the ampere level, and the value of the main circuit current being equal to the sum of the values ​​of the bypass thyristor branch current and the lower IGBT and anti-parallel diode branch current;

[0077] The second identification submodule is used to determine that the bypass thyristor of the half-bridge power module is in a normal state and the state of the lower IGBT and anti-parallel diode branch of the half-bridge power module is in a short-circuit fault state according to the values ​​of the main circuit current and the lower IGBT and anti-parallel diode branch current being equal, and the value of the bypass thyristor branch current being in the milliampere level or the microampere level;

[0078] The third identification submodule is used to determine that the state of the bypass thyristor of the half-bridge power module is a short-circuit fault state, and the state of the lower tube IGBT and anti-parallel diode branch of the half-bridge power module is normal, based on the values ​​of the main circuit current and the bypass thyristor branch current being equal, and the values ​​of the lower tube IGBT and anti-parallel diode branch current being in the milliampere level or microampere level.

[0079] In an embodiment of the present invention, the switch state acquisition module is further used to control the bypass switch of the half-bridge power module to be opened according to the bypass switch state of the half-bridge power module being in the closed state, so that the bypass switch state of the half-bridge power module is in the open state.

[0080] It should be noted that the contents of the module in the apparatus of Example 2 correspond to the steps of the method of Example 1. The steps of the method of Example 1 have been described in detail in Example 1, and the description of the contents of the module will not be repeated in Example 2.

[0081] Example 3:

[0082] The present invention also provides a terminal device, comprising a processor and a memory;

[0083] A memory, configured to store program codes and transmit the program codes to a processor;

[0084] The processor is configured to execute the above-mentioned method for identifying the fault status of components in the half-bridge power module according to instructions in the program code.

[0085] Those skilled in the art will clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0086] In the several embodiments provided in this application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are merely schematic. For example, the division of the units is merely a logical function division. In actual implementation, there may be other division methods, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be an indirect coupling or communication connection through some interfaces, devices or units, which can be electrical, mechanical or other forms.

[0087] The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of these units may be selected to achieve the purpose of this embodiment according to actual needs.

[0088] In addition, the functional units in the various embodiments of the present invention may be integrated into a single processing unit, each unit may exist physically separately, or two or more units may be integrated into a single unit. The aforementioned integrated units may be implemented in the form of hardware or software functional units.

[0089] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art, or all or part of the technical solution can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes several instructions for enabling a computer device (which can be a personal computer, server, or network device, etc.) to execute all or part of the steps of the method described in each embodiment of the present invention. The aforementioned storage medium includes: various media that can store program codes, such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk.

[0090] As described above, the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that the technical solutions described in the above embodiments can still be modified, or some of the technical features thereof can be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for identifying a component fault state in a half-bridge power module, applied to a test system for the component fault state in a half-bridge power module, characterized in that: The identification method includes the following steps: Acquire a half-bridge power module whose port is in a short-circuit state after a fault, and determine a state of its bypass switch according to the half-bridge power module; If the bypass switch state of the half-bridge power module is in the off state, the half-bridge power module is connected in series with a test module, and the currents of the main circuit, the bypass thyristor branch, and the lower IGBT and anti-parallel diode branch of the half-bridge power module in a stable state are measured by the test module to obtain the main circuit current, the bypass thyristor branch current, and the lower IGBT and anti-parallel diode branch current; Determining that the state of the bypass thyristor and / or the lower IGBT and anti-parallel diode branch of the half-bridge power module is a short-circuit fault state according to the main loop current, the bypass thyristor branch current, and the lower IGBT and anti-parallel diode branch current; Among them, the test module includes a first current transformer, a second current transformer, a third current transformer and a current limiting resistor, and the half-bridge power module includes a main circuit connection end, a second connection end, a bypass thyristor branch, a lower tube IGBT and an anti-parallel diode branch. The main circuit connection end is connected to the first current transformer, the second connection end is connected to the current limiting resistor, the bypass thyristor branch is connected to the second current transformer, and the lower tube IGBT and the anti-parallel diode branch are connected to the third current transformer.

2. The method for identifying component fault status in a half-bridge power module according to claim 1, characterized in that: Measuring the currents of the main circuit, the bypass thyristor branch, the lower IGBT, and the anti-parallel diode branch of the half-bridge power module in a stable state by the test module includes: Closing the switch element of the test module, and adjusting the voltage provided by the test module to the half-bridge power module from 0 until the main loop current of the half-bridge power module is in a stable state; When the main circuit current of the half-bridge power module is in a stable state, the currents of the main circuit, bypass thyristor branch, lower IGBT and anti-parallel diode branch of the half-bridge power module are detected by the first current transformer, the second current transformer and the third current transformer to obtain the main circuit current, bypass thyristor branch current and lower IGBT and anti-parallel diode branch current of the half-bridge power module.

3. The method for identifying component fault status in a half-bridge power module according to claim 1, wherein: Determining that the bypass thyristor and / or the lower IGBT and anti-parallel diode branch of the half-bridge power module is in a short-circuit fault state according to the main loop current, the bypass thyristor branch current, and the lower IGBT and anti-parallel diode branch current includes: If the values ​​of the main circuit current, the bypass thyristor branch current, and the lower IGBT and anti-parallel diode branch current are in the ampere level, and the value of the main circuit current is equal to the sum of the values ​​of the bypass thyristor branch current and the lower IGBT and anti-parallel diode branch current, then the bypass thyristor and lower IGBT and anti-parallel diode branches of the half-bridge power module are all in a short-circuit fault state; If the main circuit current is equal to the current of the lower IGBT and anti-parallel diode branch, and the bypass thyristor branch current is in the milliampere or microampere level, the bypass thyristor of the half-bridge power module is in a normal state, and the lower IGBT and anti-parallel diode branch of the half-bridge power module are in a short-circuit fault state; If the main circuit current is equal to the value of the bypass thyristor branch current, and the value of the lower IGBT and anti-parallel diode branch current is in the milliampere or microampere level, the state of the bypass thyristor of the half-bridge power module is a short-circuit fault state, and the state of the lower IGBT and anti-parallel diode branch of the half-bridge power module is normal.

4. The method for identifying component fault status in a half-bridge power module according to claim 1, wherein: include: After determining the fault status of the bypass thyristor and / or lower IGBT and anti-parallel diode branch of the half-bridge power module, the voltage provided by the test module to the half-bridge power module is adjusted to 0, and the switch element of the test module is disconnected.

5. The method for identifying component fault status in a half-bridge power module according to claim 1, wherein: include: If the bypass switch state of the half-bridge power module is in a closed state, the bypass switch of the half-bridge power module is controlled to be opened, so that the bypass switch state of the half-bridge power module is in an open state.

6. A device for identifying component fault status in a half-bridge power module, characterized in that: Applied to a test system for component fault status in a half-bridge power module, the identification device includes: a switch status acquisition module, a current data measurement module, and an identification module; The switch state acquisition module is used to acquire a half-bridge power module whose port is in a short-circuit state after a fault, and determine the state of its bypass switch according to the half-bridge power module; The current data measurement module is configured to connect the half-bridge power module in series with a test module based on the bypass switch state of the half-bridge power module being in an off state, and measure the currents of the main circuit, the bypass thyristor branch, and the lower IGBT and anti-parallel diode branch of the half-bridge power module in a stable state through the test module to obtain the main circuit current, the bypass thyristor branch current, and the lower IGBT and anti-parallel diode branch current; The identification module is configured to determine whether the state of the bypass thyristor and / or the lower IGBT and anti-parallel diode branch of the half-bridge power module is a short-circuit fault state according to the main loop current, the bypass thyristor branch current, and the lower IGBT and anti-parallel diode branch current; Among them, the test module includes a first current transformer, a second current transformer, a third current transformer and a current limiting resistor, and the half-bridge power module includes a main circuit connection end, a second connection end, a bypass thyristor branch, a lower tube IGBT and an anti-parallel diode branch. The main circuit connection end is connected to the first current transformer, the second connection end is connected to the current limiting resistor, the bypass thyristor branch is connected to the second current transformer, and the lower tube IGBT and the anti-parallel diode branch are connected to the third current transformer.

7. The device for identifying component fault status in a half-bridge power module according to claim 6, characterized in that: The current data measurement module includes a regulating submodule and a measuring submodule; The regulating submodule is configured to close the switch element of the test module and regulate the voltage provided by the test module to the half-bridge power module from 0 until the main loop current of the half-bridge power module is in a stable state; The measurement submodule is used to detect the currents of the main circuit, bypass thyristor branch, lower IGBT and anti-parallel diode branch of the half-bridge power module through the first current transformer, the second current transformer and the third current transformer when the main circuit current of the half-bridge power module is in a stable state, and obtain the main circuit current, bypass thyristor branch current and lower IGBT and anti-parallel diode branch current of the half-bridge power module.

8. The device for identifying component fault status in a half-bridge power module according to claim 6, characterized in that: The identification module includes a first identification submodule, a second identification submodule and a third identification submodule; The first identification submodule is configured to determine, based on the values ​​of the main circuit current, the bypass thyristor branch current, and the lower IGBT and anti-parallel diode branch current being in the ampere level, and the value of the main circuit current being equal to the sum of the values ​​of the bypass thyristor branch current and the lower IGBT and anti-parallel diode branch current, that the states of the bypass thyristor, lower IGBT, and anti-parallel diode branch of the half-bridge power module are all in a short-circuit fault state; The second identification submodule is configured to determine, based on the values ​​of the main loop current and the lower IGBT and anti-parallel diode branch current being equal, and the value of the bypass thyristor branch current being in the milliampere level or the microampere level, that the state of the bypass thyristor of the half-bridge power module is normal, and the state of the lower IGBT and anti-parallel diode branch of the half-bridge power module is in the short-circuit fault state; The third identification submodule is used to determine that, based on the values ​​of the main loop current and the bypass thyristor branch current being equal, and the values ​​of the lower IGBT and anti-parallel diode branch current being in the milliampere or microampere level, the state of the bypass thyristor of the half-bridge power module is a short-circuit fault state, and the state of the lower IGBT and anti-parallel diode branch of the half-bridge power module is normal.

9. The device for identifying component fault status in a half-bridge power module according to claim 6, characterized in that: The switch state acquisition module is further configured to control the bypass switch of the half-bridge power module to be opened according to the bypass switch state of the half-bridge power module being in the closed state, so that the bypass switch state of the half-bridge power module is in the open state.

10. A terminal device, characterized in that: including a processor and a memory; The memory is used to store program code and transmit the program code to the processor; The processor is configured to execute the method for identifying a fault state of a component in a half-bridge power module according to any one of claims 1 to 5 according to instructions in the program code.

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