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

Abstract

The present invention relates to a method, device and equipment for identifying the fault status of components in a full-bridge power module. The method obtains a first set of current data and a second set of current data of a full-bridge power module that has a short-circuit fault through a test module, and determines whether the status of each internal component of the full-bridge power module is a short-circuit fault based on analysis of the first set of current data and the second set of current data. A simple test module can be used to determine which internal component in the full-bridge power module has a short-circuit fault at a construction site. There is no need to send the full-bridge power module back to the original factory for dissection and testing to determine which internal component has failed. This avoids the problem of delayed accident investigation progress due to a long existence time, and solves the technical problem that the existing method requires special disassembly equipment to disassemble the full-bridge module of the faulty converter valve before the fault can be identified. This method takes a long time to identify the fault, which delays the progress of the 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 full-bridge power module. Background Art

[0002] In a converter valve, if a full-bridge module experiences a short-circuit, the fault status of the five internal components connected in parallel to the module's ports—the bypass thyristor, the first IGBT and anti-parallel diode, the second IGBT and anti-parallel diode, the third IGBT and anti-parallel diode, and the fourth IGBT and anti-parallel diode—needs to be determined as soon as possible to determine the cause of the short circuit. Because the five internal components connected in parallel to the full-bridge module's ports are tightly crimped together with the water-cooled heat sink and insulation crimping assembly, directly measuring the full-bridge module's port impedance without disassembling the module is not sufficient to determine the fault status of each of the five internal components.

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

[0004] An embodiment of the present invention provides a method, device and equipment for identifying the fault status of components in a full-bridge power module, which is used to solve the technical problem that the fault can only be identified after the full-bridge module with a faulty converter valve is disassembled using special disassembly equipment. This method takes a long time to identify the fault and 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 full-bridge power module is applied to a test system for the component fault state in the full-bridge power module. The method comprises the following steps:

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

[0008] If the bypass switch state of the full-bridge power module is in the off state, the full-bridge power module is connected in series with the test module; the branch current of each port of the full-bridge power module in a stable state is measured by the test module in a positive current direction to obtain a first set of current data; and the branch current of each port of the full-bridge power module in a stable state is measured by the test module in a negative current direction to obtain a second set of current data;

[0009] Faults of various internal components of the full-bridge power module are determined according to the first set of current data and the second set of current data.

[0010] Preferably, measuring the branch current of each port of the full-bridge power module in a stable state includes:

[0011] Closing the switch element of the test module, and adjusting the voltage provided by the test module to the full-bridge power module from 0 until the main loop current of the full-bridge power module is in a stable state;

[0012] When the main circuit current of the full-bridge power module is in a stable state, the current of the main circuit, the bypass thyristor branch, the first IGBT and the anti-parallel diode branch, and the second IGBT and the anti-parallel diode branch of the full-bridge power module are measured to obtain current data of the full-bridge power module;

[0013] The first set of current data and the second set of current data both include current data consisting of a main circuit current, a bypass thyristor branch current, a first IGBT and anti-parallel diode branch current, and a second IGBT and anti-parallel diode branch current.

[0014] Preferably, determining the fault of each internal component of the full-bridge power module according to the first set of current data and the second set of current data includes:

[0015] If the absolute values ​​of the bypass thyristor branch current of the first set of current data and the bypass thyristor branch current of the second set of current data are both in the ampere level, the bypass thyristor of the full-bridge power module is short-circuited;

[0016] If the absolute value of the first IGBT and anti-parallel diode branch current of the first set of current data is in the ampere level, the third IGBT and anti-parallel diode of the full-bridge power module are in a short-circuit fault;

[0017] If the absolute value of the first IGBT and anti-parallel diode branch current of the second set of current data is in the ampere level, the first IGBT and anti-parallel diode of the full-bridge power module are in a short circuit fault;

[0018] If the absolute value of the second IGBT and anti-parallel diode branch current of the first set of current data is in the ampere level, the second IGBT and anti-parallel diode of the full-bridge power module are in a short-circuit fault;

[0019] If the absolute value of the second IGBT and anti-parallel diode branch current of the second set of current data is in the ampere level, the fourth IGBT and anti-parallel diode of the full-bridge power module are in a short circuit fault;

[0020] The internal components of the full-bridge power module include a bypass switch, a first IGBT and an anti-parallel diode, a second IGBT and an anti-parallel diode, a third IGBT and an anti-parallel diode, and a fourth IGBT and an anti-parallel diode.

[0021] Preferably, the method for identifying the fault status of components within the full-bridge power module includes: after determining the fault of each component within the full-bridge power module, adjusting the voltage provided by the test module to the full-bridge power module to 0, and disconnecting the switch element of the test module.

[0022] Preferably, the method for identifying the fault status of a component in the full-bridge power module includes: if the bypass switch state of the full-bridge power module is in a closed state, controlling the bypass switch of the full-bridge power module to be opened so that the bypass switch state of the full-bridge power module is in an open state.

[0023] The present invention also provides a device for identifying the fault status of a component in a full-bridge power module, which is used in a test system for the fault status of a component in a full-bridge power module. The device comprises: a switch state acquisition module, a current data measurement module and an identification module;

[0024] The switch status acquisition module is used to acquire a full-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 full-bridge power module;

[0025] The current data measurement module is configured to connect the full-bridge power module in series with the test module based on the bypass switch state of the full-bridge power module being in the off state, and measure the branch current of each port of the full-bridge power module in a stable state from a positive current direction through the test module to obtain a first set of current data; and the test module measures the branch current of each port of the full-bridge power module in a stable state from a negative current direction to obtain a second set of current data;

[0026] The identification module is used to determine the fault of each internal component of the full-bridge power module according to the first set of current data and the second set of current data.

[0027] Preferably, the current data measurement module includes a regulating submodule and a measuring submodule:

[0028] 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 full-bridge power module from 0 until the main loop current of the full-bridge power module is in a stable state;

[0029] The measurement submodule is configured to measure the currents of the main circuit, the bypass thyristor branch, the first IGBT and anti-parallel diode branch, and the second IGBT and anti-parallel diode branch of the full-bridge power module when the main circuit current of the full-bridge power module is in a stable state, so as to obtain current data of the full-bridge power module;

[0030] The first set of current data and the second set of current data both include current data consisting of a main circuit current, a bypass thyristor branch current, a first IGBT and anti-parallel diode branch current, and a second IGBT and anti-parallel diode branch current.

[0031] Preferably, the identification module includes a first identification submodule, a second identification submodule, a third identification submodule, a fourth identification submodule and a fifth identification submodule:

[0032] The first identification submodule is configured to determine that the bypass thyristor of the full-bridge power module is in a short circuit fault according to the absolute values ​​of the bypass thyristor branch current of the first set of current data and the bypass thyristor branch current of the second set of current data being both in the ampere level;

[0033] The second identification submodule is configured to determine that the third IGBT and the anti-parallel diode of the full-bridge power module are in a short circuit fault according to the absolute value of the current of the first IGBT and the anti-parallel diode branch of the first set of current data being in the ampere level;

[0034] The third identification submodule is configured to determine, based on the absolute value of the branch current of the first IGBT and the anti-parallel diode of the second set of current data being in the ampere level, that the first IGBT and the anti-parallel diode of the full-bridge power module are in a short circuit fault;

[0035] The fourth identification submodule is configured to determine that the second IGBT and the anti-parallel diode of the full-bridge power module are in a short circuit fault according to the absolute value of the second IGBT and the anti-parallel diode branch current of the first set of current data being in the ampere level;

[0036] The fifth identification submodule is configured to determine, based on the absolute value of the second IGBT and anti-parallel diode branch current of the second set of current data being in the ampere level, that the fourth IGBT and anti-parallel diode of the full-bridge power module are in a short circuit fault;

[0037] The internal components of the full-bridge power module include a bypass switch, a first IGBT and an anti-parallel diode, a second IGBT and an anti-parallel diode, a third IGBT and an anti-parallel diode, and a fourth IGBT and an anti-parallel diode.

[0038] Preferably, the switch state acquisition module is further used to control the bypass switch of the full-bridge power module to be opened according to the bypass switch state of the full-bridge power module being in the closed state, so that the bypass switch state of the full-bridge power module is in the open state.

[0039] The present invention also provides a terminal device, comprising a processor and a memory;

[0040] The memory is used to store program code and transmit the program code to the processor;

[0041] The processor is configured to execute the above-mentioned method for identifying the fault status of components in the full-bridge power module according to the instructions in the program code.

[0042] 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 within a full-bridge power module, the method comprising obtaining a full-bridge power module whose ports are in a short-circuit state after a fault, and determining the state of its bypass switch based on the full-bridge power module; if the bypass switch state of the full-bridge power module is in a disconnected state, connecting the full-bridge power module in series with a test module, and measuring the branch current of each port of the full-bridge power module in a stable state from a positive current direction through the test module to obtain a first set of current data; measuring the branch current of each port of the full-bridge power module in a stable state from a negative current direction to obtain a second set of current data; and determining the fault of each internal component of the full-bridge power module based on the first set of current data and the second set of current data. The method for identifying the fault status of components within a full-bridge power module obtains a first set of current data and a second set of current data of the full-bridge power module that has a short-circuit fault through a test module, and determines whether the status of each internal component of the full-bridge power module is a short-circuit fault based on analysis of the first set of current data and the second set of current data. A simple test module can be used to determine which internal component of the full-bridge power module has a short-circuit fault at the project site, and there is no need to send the full-bridge power module back to the original factory for dissection and testing to determine which internal component has failed. This avoids the problem of delayed accident investigation progress due to a long existence time, and solves the technical problem that the existing method requires special disassembly equipment to disassemble the full-bridge module of the faulty converter valve 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

[0043] 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.

[0044] Figure 1 This is a flowchart of the steps of a method for identifying a fault state of a component in a full-bridge power module according to an embodiment of the present invention;

[0045] Figure 2 This is a circuit schematic diagram of a positive current direction test system for a method for identifying component fault status in a full-bridge power module according to an embodiment of the present invention;

[0046] Figure 3 This is a circuit schematic diagram of a negative current direction test system for a method for identifying component fault status in a full-bridge power module according to an embodiment of the present invention. DETAILED DESCRIPTION

[0047] 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.

[0048] The embodiments of the present application provide a method, device, and equipment for identifying the fault status of components within a full-bridge power module, which are applied to a test system for the fault status of components within a full-bridge power module. They solve the technical problem that in the existing method, special disassembly equipment is required to disassemble the full-bridge module with a faulty converter valve before the fault can be identified. This method takes a long time to identify the fault, which delays the progress of fault investigation.

[0049] Example 1:

[0050] Figure 1 Schematic diagram of the steps of a method for identifying a fault state of a component in a full-bridge power module according to an embodiment of the present invention. Figure 2 This is a circuit schematic diagram of a positive current direction test system for a method for identifying component fault status in a full-bridge power module according to an embodiment of the present invention. Figure 3 This is a circuit schematic diagram of a negative current direction test system for a method for identifying component fault status in a full-bridge power module according to an embodiment of the present invention.

[0051] like Figures 1 to 3 As shown, the present invention provides a method for identifying the fault status of a component in a full-bridge power module, which is applied to a test system for the fault status of a component in a full-bridge power module. The method for identifying the fault status of a component in a full-bridge power module includes the following steps:

[0052] S1. Obtain a full-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 full-bridge power module.

[0053] It should be noted that in step S1, a full-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 detect the bypass switch status of the full-bridge power module to determine the bypass switch status of the full-bridge power module. Step S2 is performed only if the bypass switch of the full-bridge power module is disconnected.

[0054] In an embodiment of the present invention, if the bypass switch state determined by the full-bridge power module is closed, the bypass switch of the full-bridge power module can be manually or automatically controlled to open so that the bypass switch state of the full-bridge power module is open.

[0055] S2. If the bypass switch state of the full-bridge power module is disconnected, the full-bridge power module is connected in series with the test module, and the branch current of each port of the full-bridge power module in the stable state is measured from the positive current direction by the test module to obtain a first set of current data; the test module measures the branch current of each port of the full-bridge power module in the stable state from the negative current direction to obtain a second set of current data.

[0056] It should be noted that in step S2 , the first set of current data and the second set of current data of the full-bridge power module having a short-circuit fault can be measured by the test module.

[0057] In the embodiment of the present invention, Figure 2 and Figure 3 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, fourth current transformer CT4, and current limiting resistor R0. The full-bridge power module includes a main circuit connection terminal 1, a second connection terminal 2, a bypass thyristor branch 3, a first IGBT and anti-parallel diode branch 4, and a second IGBT and anti-parallel diode branch 5. 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, the first IGBT and anti-parallel diode branch 4 is connected to the third current transformer CT3, and the second IGBT and anti-parallel diode branch 5 is connected to the fourth current transformer CT4. 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.

[0058] It should be noted that the switching element K may be a circuit breaker, the bypass thyristor branch 3 is a branch of the bypass thyristor in the full-bridge power module, the first IGBT and anti-parallel diode branch 4 is a branch of the first IGBT1 and anti-parallel diode D1 in the full-bridge power module, and the second IGBT and anti-parallel diode branch 5 is a branch of the second IGBT2 and anti-parallel diode D2 in the full-bridge power module. In this embodiment, the internal components of the full-bridge power module include the bypass switch, the first IGBTT1 and anti-parallel diode D1, the second IGBTT2 and anti-parallel diode D2, the third IGBTT3 and anti-parallel diode D3, and the fourth IGBTT4 and anti-parallel diode D4.

[0059] In the embodiment of the present invention, the first set of current data includes the current I of the main circuit of the full-bridge power module measured by the first current transformer CT1. 10 The second current transformer CT2 measures the current I of the bypass thyristor branch of the full-bridge power module20 The third current transformer CT3 measures the current I of the first IGBTT1 and the anti-parallel diode D1 branch. 30 The fourth current transformer CT4 measures the current I of the second IGBTT2 and the anti-parallel diode D4 branch. 40 , the positive direction of the test current is as follows Figure 2 The second set of current data includes the current I of the main circuit of the full-bridge power module measured by the first current transformer CT1. 11 The second current transformer CT2 measures the current I of the bypass thyristor branch of the full-bridge power module 21 The third current transformer CT3 measures the current I of the first IGBTT1 and the anti-parallel diode D1 branch. 31 The fourth current transformer CT4 measures the current I of the second IGBTT2 and the anti-parallel diode D4 branch. 41 , the positive direction of the test current is as follows Figure 3 The process of measuring the branch current of each port of the full-bridge power module in the steady state by using the test module is as follows: the full-bridge power module is connected in series with the test module, and then the switch element K is closed and the DC voltage source U is adjusted from 0. S The voltage value is adjusted until the main circuit current is stabilized at about tens of amperes. After the main circuit current of the full-bridge power module to be measured is stable (without large fluctuations), the first current transformer CT1, the second current transformer CT2, the third current transformer CT3 and the fourth current transformer CT4 are used to measure I 10 or I 11 , I 20 or I 21 , I 30 or I 31 , I 40 or I 41 The current size.

[0060] S3. Determine the fault of each internal component of the full-bridge power module based on the first set of current data and the second set of current data.

[0061] It should be noted that in step S3, the current values ​​of the first set of current data and the second set of current data can be used to determine whether the status of the bypass switch, the first IGBTT1 and the anti-parallel diode D1, the second IGBTT2 and the anti-parallel diode D2, the third IGBTT3 and the anti-parallel diode D3 and / or the fourth IGBTT4 and the anti-parallel diode D4 of the full-bridge power module is a short-circuit fault, so that the method for identifying the fault status of the components within the full-bridge power module can use a simple test module to determine which internal component of the full-bridge power module has a short-circuit fault at the engineering site.

[0062] The present invention provides a method for identifying the fault status of components within a full-bridge power module, comprising: obtaining a full-bridge power module whose ports are in a short-circuit state after the fault, and determining the state of its bypass switch based on the full-bridge power module; if the bypass switch state of the full-bridge power module is in an open state, connecting the full-bridge power module in series with a test module, and measuring the branch current of each port of the full-bridge power module in a stable state from a positive current direction through the test module to obtain a first set of current data; measuring the branch current of each port of the full-bridge power module in a stable state from a negative current direction through the test module to obtain a second set of current data; and determining the fault of each internal component of the full-bridge power module based on the first set of current data and the second set of current data. The method for identifying the fault status of components within a full-bridge power module obtains a first set of current data and a second set of current data of the full-bridge power module that has a short-circuit fault through a test module, and determines whether the status of each internal component of the full-bridge power module is a short-circuit fault based on analysis of the first set of current data and the second set of current data. A simple test module can be used to determine which internal component of the full-bridge power module has a short-circuit fault at the project site, and there is no need to send the full-bridge power module back to the original factory for dissection and testing to determine which internal component has failed. This avoids the problem of delayed accident investigation progress due to a long existence time, and solves the technical problem that the existing method requires special disassembly equipment to disassemble the full-bridge module of the faulty converter valve before the fault can be identified, and this method takes a long time to identify the fault, which delays the progress of fault investigation.

[0063] In one embodiment of the present invention, measuring the branch current of each port of the full-bridge power module in a stable state includes:

[0064] Close the switch element of the test module and adjust the voltage provided by the test module to the full-bridge power module from 0 until the main circuit current of the full-bridge power module is in a stable state;

[0065] When the main circuit current of the full-bridge power module is in a stable state, the currents of the main circuit, the bypass thyristor branch, the first IGBT and the anti-parallel diode branch, and the fourth branch of the full-bridge power module are detected by the first current transformer, the second current transformer, the third current transformer, and the fourth current transformer to obtain the current data of the full-bridge power module;

[0066] The current data and the second set of current data both include current data consisting of the main circuit current, the bypass thyristor branch current, the first IGBT and anti-parallel diode branch current, and the second IGBT and anti-parallel diode branch current.

[0067] It should be noted that only when the main circuit current of the full-bridge power module is in a stable state can the current detected by the measurement module be used to identify whether each internal component in the full-bridge power module has a short circuit fault.

[0068] In one embodiment of the present invention, determining the fault of each internal component of the full-bridge power module according to the first set of current data and the second set of current data includes:

[0069] If the bypass thyristor branch current I 20 The bypass thyristor branch current I of the second set of current data 21 If the absolute values ​​of are all in ampere level, the bypass thyristor of the full-bridge power module is in short circuit fault;

[0070] If the first IGBT and anti-parallel diode branch current I 30 If the absolute value of the voltage is in ampere, the third IGBT and the anti-parallel diode of the full-bridge power module are in short-circuit fault.

[0071] If the first IGBT and anti-parallel diode branch current I 31 If the absolute value of the voltage is in ampere, the first IGBT and the anti-parallel diode of the full-bridge power module are in short-circuit fault.

[0072] If the second IGBT and anti-parallel diode branch current I 40 If the absolute value of the voltage is in ampere, the second IGBT and the anti-parallel diode of the full-bridge power module are in short-circuit fault.

[0073] If the second IGBT and anti-parallel diode branch current I 41 If the absolute value of is in ampere level, the fourth IGBT and anti-parallel diode of the full-bridge power module are in short circuit fault.

[0074] 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. In this embodiment, if the bypass thyristor branch current I 20 The bypass thyristor branch current I of the second set of current data 21 If the absolute values ​​of the first IGBT and anti-parallel diode branch current I of the first set of current data are all in the milliampere or microampere level, the bypass switch of the full-bridge power module is normal and not damaged. 30 If the absolute value of is in the milliampere or microampere level, the third IGBT and the anti-parallel diode of the full-bridge power module are normal and not damaged. 31If the absolute value of is in the milliampere or microampere level, the first IGBT and anti-parallel diode of the full-bridge power module are normal and not damaged. 40 If the absolute value of is in the milliampere or microampere level, the second IGBT and anti-parallel diode of the full-bridge power module are normal and not damaged. 41 If the absolute value of is in the milliampere or microampere level, the fourth IGBT and the anti-parallel diode of the full-bridge power module are normal and not damaged.

[0075] In one embodiment of the present invention, the method for identifying the fault status of the components within the full-bridge power module includes: after determining the fault of each internal component of the full-bridge power module, adjusting the voltage provided by the test module to the full-bridge power module to 0, and disconnecting the switching element of the test module.

[0076] It should be noted that after the fault of each internal component of the full-bridge power module is identified, 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.

[0077] Example 2:

[0078] The present invention also provides a device for identifying the fault status of a component in a full-bridge power module, which is applied to a test system for the fault status of a component in a full-bridge power module. The device includes a switch state acquisition module, a current data measurement module, and an identification module.

[0079] A switch status acquisition module is used to acquire a full-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 full-bridge power module;

[0080] The current data measurement module is used to connect the full-bridge power module and the test module in series according to the bypass switch state of the full-bridge power module being in the disconnected state, and measure the branch current of each port of the full-bridge power module in a stable state from the positive current direction through the test module to obtain a first set of current data; the test module measures the branch current of each port of the full-bridge power module in a stable state from the negative current direction to obtain a second set of current data;

[0081] The identification module is used to determine the fault of each internal component of the full-bridge power module according to the first set of current data and the second set of current data.

[0082] In an embodiment of the present invention, the current data measurement module includes a regulating submodule and a measuring submodule;

[0083] 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 full-bridge power module from 0 until the main loop current of the full-bridge power module is in a stable state;

[0084] The measurement submodule is used to measure the currents of the main circuit, the bypass thyristor branch, the first IGBT and the anti-parallel diode branch, and the second IGBT and the anti-parallel diode branch of the full-bridge power module when the main circuit current of the full-bridge power module is in a stable state, so as to obtain the current data of the full-bridge power module;

[0085] The first set of current data and the second set of current data both include current data consisting of the main circuit current, the bypass thyristor branch current, the first IGBT and anti-parallel diode branch current, and the second IGBT and anti-parallel diode branch current.

[0086] In an embodiment of the present invention, the identification module includes a first identification submodule, a second identification submodule, a third identification submodule, a fourth identification submodule, and a fifth identification submodule;

[0087] A first identification submodule is configured to determine that the bypass thyristor of the full-bridge power module is in a short-circuit fault according to the absolute values ​​of the bypass thyristor branch current of the first set of current data and the bypass thyristor branch current of the second set of current data being both in ampere level;

[0088] A second identification submodule is configured to determine that, based on the absolute value of the current of the first IGBT and the anti-parallel diode branch of the first set of current data being in the ampere level, the third IGBT and the anti-parallel diode of the full-bridge power module are in a short-circuit fault;

[0089] A third identification submodule is configured to determine, based on the second set of current data, that the absolute value of the branch current of the first IGBT and the anti-parallel diode is in the ampere level, that the first IGBT and the anti-parallel diode of the full-bridge power module are in a short circuit fault;

[0090] a fourth identification submodule, configured to determine, based on the first set of current data, that the absolute value of the second IGBT and anti-parallel diode branch current is in the ampere level, that the second IGBT and anti-parallel diode of the full-bridge power module are in a short-circuit fault;

[0091] a fifth identification submodule, configured to determine, based on the second set of current data, that the absolute value of the branch current of the second IGBT and the anti-parallel diode is in the ampere level, that the fourth IGBT and the anti-parallel diode of the full-bridge power module are in a short circuit fault;

[0092] The internal components of the full-bridge power module include a bypass switch, a first IGBT and an anti-parallel diode, a second IGBT and an anti-parallel diode, a third IGBT and an anti-parallel diode, and a fourth IGBT and an anti-parallel diode.

[0093] In an embodiment of the present invention, the switch state acquisition module is further used to control the bypass switch of the full-bridge power module to be opened according to the bypass switch state of the full-bridge power module being in a closed state, so that the bypass switch state of the full-bridge power module is in an open state.

[0094] 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.

[0095] Example 3:

[0096] The present invention also provides a terminal device, comprising a processor and a memory;

[0097] A memory, configured to store program codes and transmit the program codes to a processor;

[0098] The processor is configured to execute the above-mentioned method for identifying the fault status of components in the full-bridge power module according to instructions in the program code.

[0099] 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.

[0100] 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.

[0101] 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.

[0102] 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.

[0103] If the integrated unit is implemented as 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 portion that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions for causing 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 code, such as a USB flash drive, a mobile hard drive, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk.

[0104] 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 failure state in a full-bridge power module, applied to a test system for the component failure state in a full-bridge power module, characterized in that: The identification method includes the following steps: Acquire a full-bridge power module whose port is in a short-circuit state after a fault, and determine a state of a bypass switch thereof according to the full-bridge power module; If the bypass switch state of the full-bridge power module is in the off state, the full-bridge power module is connected in series with the test module; the branch current of each port of the full-bridge power module in a stable state is measured by the test module in a positive current direction to obtain a first set of current data; and the branch current of each port of the full-bridge power module in a stable state is measured by the test module in a negative current direction to obtain a second set of current data; determining a fault of each internal component of the full-bridge power module according to the first set of current data and the second set of current data; Measuring the branch current of each port of the full-bridge power module in a stable state includes: Closing the switch element of the test module, and adjusting the voltage provided by the test module to the full-bridge power module from 0 until the main loop current of the full-bridge power module is in a stable state; When the main circuit current of the full-bridge power module is in a stable state, the current of the main circuit, the bypass thyristor branch, the first IGBT and the anti-parallel diode branch, and the second IGBT and the anti-parallel diode branch of the full-bridge power module are measured to obtain current data of the full-bridge power module; The first set of current data and the second set of current data both include current data consisting of a main circuit current, a bypass thyristor branch current, a first IGBT and anti-parallel diode branch current, and a second IGBT and anti-parallel diode branch current.

2. The method for identifying a fault state of a component in a full-bridge power module according to claim 1, wherein: Determining the fault of each internal component of the full-bridge power module according to the first set of current data and the second set of current data includes: If the absolute values ​​of the bypass thyristor branch current of the first set of current data and the bypass thyristor branch current of the second set of current data are both in the ampere level, the bypass thyristor of the full-bridge power module is short-circuited; If the absolute value of the first IGBT and anti-parallel diode branch current of the first set of current data is in the ampere level, the third IGBT and anti-parallel diode of the full-bridge power module are in a short-circuit fault; If the absolute value of the first IGBT and anti-parallel diode branch current of the second set of current data is in the ampere level, the first IGBT and anti-parallel diode of the full-bridge power module are in a short circuit fault; If the absolute value of the second IGBT and anti-parallel diode branch current of the first set of current data is in the ampere level, the second IGBT and anti-parallel diode of the full-bridge power module are in a short-circuit fault; If the absolute value of the second IGBT and anti-parallel diode branch current of the second set of current data is in the ampere level, the fourth IGBT and anti-parallel diode of the full-bridge power module are in a short circuit fault; The internal components of the full-bridge power module include a bypass switch, a first IGBT and an anti-parallel diode, a second IGBT and an anti-parallel diode, a third IGBT and an anti-parallel diode, and a fourth IGBT and an anti-parallel diode.

3. The method for identifying component fault status in a full-bridge power module according to claim 1, characterized in that: include: After determining that a fault has occurred in each internal component of the full-bridge power module, the voltage provided by the test module to the full-bridge power module is adjusted to 0, and the switch element of the test module is disconnected.

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

5. A device for identifying component fault status in a full-bridge power module, characterized in that: Applied to a test system for component fault status in a full-bridge power module, the identification device includes: a switch status acquisition module, a current data measurement module, and an identification module; The switch status acquisition module is used to acquire a full-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 full-bridge power module; The current data measurement module is configured to connect the full-bridge power module in series with the test module based on the bypass switch state of the full-bridge power module being in the off state, and measure the branch current of each port of the full-bridge power module in a stable state from a positive current direction through the test module to obtain a first set of current data; and the test module measures the branch current of each port of the full-bridge power module in a stable state from a negative current direction to obtain a second set of current data; The identification module is configured to determine a fault in each internal component of the full-bridge power module based on the first set of current data and the second set of current data; 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 full-bridge power module from 0 until the main loop current of the full-bridge power module is in a stable state; The measurement submodule is configured to measure the currents of the main circuit, the bypass thyristor branch, the first IGBT and anti-parallel diode branch, and the second IGBT and anti-parallel diode branch of the full-bridge power module when the main circuit current of the full-bridge power module is in a stable state, so as to obtain current data of the full-bridge power module; The first set of current data and the second set of current data both include current data consisting of a main circuit current, a bypass thyristor branch current, a first IGBT and anti-parallel diode branch current, and a second IGBT and anti-parallel diode branch current.

6. The device for identifying component fault status in a full-bridge power module according to claim 5, characterized in that: The identification module includes a first identification submodule, a second identification submodule, a third identification submodule, a fourth identification submodule and a fifth identification submodule; The first identification submodule is configured to determine that the bypass thyristor of the full-bridge power module is in a short circuit fault according to the absolute values ​​of the bypass thyristor branch current of the first set of current data and the bypass thyristor branch current of the second set of current data being both in the ampere level; The second identification submodule is configured to determine that the third IGBT and the anti-parallel diode of the full-bridge power module are in a short circuit fault according to the absolute value of the current of the first IGBT and the anti-parallel diode branch of the first set of current data being in the ampere level; The third identification submodule is configured to determine, based on the absolute value of the branch current of the first IGBT and the anti-parallel diode of the second set of current data being in the ampere level, that the first IGBT and the anti-parallel diode of the full-bridge power module are in a short circuit fault; The fourth identification submodule is configured to determine that the second IGBT and the anti-parallel diode of the full-bridge power module are in a short circuit fault according to the absolute value of the second IGBT and the anti-parallel diode branch current of the first set of current data being in the ampere level; The fifth identification submodule is configured to determine, based on the absolute value of the second IGBT and anti-parallel diode branch current of the second set of current data being in the ampere level, that the fourth IGBT and anti-parallel diode of the full-bridge power module are in a short circuit fault; The internal components of the full-bridge power module include a bypass switch, a first IGBT and an anti-parallel diode, a second IGBT and an anti-parallel diode, a third IGBT and an anti-parallel diode, and a fourth IGBT and an anti-parallel diode.

7. The device for identifying component fault status in a full-bridge power module according to claim 5, characterized in that: The switch state acquisition module is further configured to control the bypass switch of the full-bridge power module to be opened according to the bypass switch state of the full-bridge power module being in the closed state, so that the bypass switch state of the full-bridge power module is in the open state.

8. 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 full-bridge power module according to any one of claims 1 to 4 according to instructions in the program code.

Images