Power module test system, method and device, computer equipment and storage medium

Abstract

The invention relates to a power module test system, method and device, computer equipment, a storage medium and a computer program product, an adjustable load is connected to a first port of a to-be-tested power module to simulate the load of the to-be-tested power module during actual operation, and an energy supplementing device is connected to a second port of the to-be-tested power module to provide power support. And combining with a control end upper control device connected to the to-be-tested power module to build a power module test system to test the to-be-tested power module. The upper control device sends double-pulse signals to the to-be-tested power module at intervals according to heat balance time of interval time of two double-pulse signals required for representing heat accumulation-free operation of the to-be-tested power module, controls the to-be-tested power module to simulate on-load through-flow working condition operation, and finally controls the to-be-tested power module to operate according to operation state parameters fed back by the to-be-tested power module. And determining a test result. Through the scheme, the operation condition of the to-be-tested power module is simulated, and the actual operation requirement of the power module can be met.

Description

Technical Field

[0001] The present application relates to the technical field of reliability testing, and in particular, to a power module testing system, method, device, computer device, storage medium, and computer program product. Background Art

[0002] With the development of the power grid, energy storage technology has become an important part of it. Among various energy storage technologies, modular energy storage technology integrates power modules and energy storage modules as energy storage valve sub-modules, and builds an energy storage system based on this, which has the advantages of high modularity, low network loss, and good economic benefits, and has gradually been widely used. As the core component of the energy storage system, testing the operation of the power module through a testing system is an important technical means to improve the operation reliability of the energy storage system.

[0003] However, in related technologies, the testing system of the power module cannot meet the actual operation requirements of the power module. Summary of the Invention

[0004] Based on this, it is necessary to provide a power module testing system, method, device, computer device, storage medium, and computer program product to simulate the on-load current-carrying condition of the power module for testing to meet the actual operation requirements of the power module.

[0005] The present application provides a power module testing system, including: a power module to be tested, an adjustable load, an energy replenishment device, and an upper control device. The two ends of the adjustable load are respectively connected to the first port of the power module to be tested, the two ends of the energy replenishment device are respectively connected to the second port of the power module to be tested, and the upper control device is connected to the control end of the power module to be tested. The upper control device is configured to send a double-pulse signal to the power module to be tested at a heat balance time interval when the test preparation is completed, and determine the test result according to the operation state parameters fed back by the power module to be tested; wherein, the heat balance time represents the interval time between two double-pulse signals required for the power module to be tested to operate without heat accumulation.

[0006] The above power module test system uses an adjustable load to access the first port of the power module under test to simulate the load during the actual operation of the power module under test, and uses an energy replenishment device to access the second port of the power module under test to provide power support. Combined with the upper control device connected to the control end of the power module under test, a power module test system is built to test the power module under test. Specifically, when the test preparation is completed, the upper control device sends double-pulse signals to the power module under test at intervals of the heat balance time, which represents the interval time of two double-pulse signals required for the power module under test to operate without heat accumulation, to control the power module under test to simulate the on-load current-carrying working condition. Finally, the test results are determined based on the operating state parameters fed back by the power module under test. Through this solution, the upper control device sends double-pulse signals at intervals of the heat balance time, controlling the on-off state of the switch without heat accumulation, so as to verify the actual operation of the power module under test and meet the actual operation requirements of the power module.

[0007] In some embodiments, the power module test system further includes a temperature detector communicatively connected to the upper control device, and the temperature detector is disposed on the power module under test.

[0008] In the above solution, the power module test system further includes a temperature detector. Through the temperature detector, the operating temperature of one or more of the power circuit, the sub-module control board, and the drive board during the test can be monitored, further improving the test reliability.

[0009] In some embodiments, the power module test system further includes an oscilloscope, and the oscilloscope is connected to the power module under test.

[0010] In the above solution, an oscilloscope is connected to the power module under test to monitor the operating state of the power module under test during the test, and the device characteristics of the power module under test at different test environments and different time nodes are obtained, further improving the test reliability.

[0011] In some embodiments, the power module test system further includes a temperature chamber connected to the upper control device, and the power module under test is disposed inside the temperature chamber.

[0012] In the above solution, the power module under test is disposed in the temperature chamber, and the test environment temperature is adjusted by the temperature chamber to simulate the high and low temperature operating scenarios of the power module under test, realizing the operating reliability test of the power module under test in high and low temperature scenarios.

[0013] In some embodiments, the power module test system further includes an electromagnetic compatibility test device communicatively connected to the upper control device.

[0014] In the above solution, the upper control device is communicatively connected to the electromagnetic compatibility test device, thereby simulating the electromagnetic interference operation scenario of the power module under test and realizing the operation reliability test of the power module under test under the electromagnetic interference scenario.

[0015] This application also provides a power module testing method, including: when the test preparation is completed, sending double-pulse signals to the bridge arm switching device of the power module under test at a heat balance time interval; wherein, the heat balance time represents the interval time between two double-pulse signals required for the power module under test to operate without heat accumulation; determining the test result according to the operation state parameters fed back by the power module under test.

[0016] In the above power module testing method, the upper control device sends double-pulse signals at a heat balance time interval, simulating the operation condition of the power module under test, and controlling the on-off state of the switch without heat accumulation, so as to verify the actual operation condition of the power module under test and meet the actual operation requirements of the power module.

[0017] In some embodiments, the sending double-pulse signals to the power module under test at a heat balance time interval includes: when the first end and the second end of the adjustable load are respectively connected to the first end and the second end of the upper bridge arm switching device of the power module under test, controlling the upper bridge arm switching device to turn off, and sending double-pulse signals to the lower bridge arm switching device of the power module under test at a heat balance time interval; when the first end and the second end of the adjustable load are respectively connected to the first end and the second end of the lower bridge arm switching device, controlling the lower bridge arm switching device to turn off, and sending double-pulse signals to the upper bridge arm switching device at a heat balance time interval.

[0018] In the above solution, in the power module under test with a half-bridge structure, the adjustable load can be respectively connected to the first end and the second end of the upper bridge arm switching device, or the first end and the second end of the lower bridge arm switching device. By controlling one bridge arm switching device to disconnect and the other bridge arm switching device to alternately conduct and disconnect under the double-pulse signal, the operation condition of the power module under test with a half-bridge structure is simulated, and the test of the power module under test with a half-bridge structure is realized.

[0019] In some embodiments, before sending double-pulse signals to the power module under test at a heat balance time interval when the test preparation is completed, it further includes: controlling the temperature chamber connected to the upper control device to operate at the test temperature.

[0020] In the above solution, before performing on-off control on the power module under test, the temperature chamber is adjusted to operate at the test temperature, so that the operation test of the power module under test in high and low temperature scenarios can be realized.

[0021] In some embodiments, before sending a double-pulse signal to the power module under test at heat balance time intervals when the test preparation is completed, it further includes: controlling an electromagnetic compatibility test device communicatively connected to the upper control device to start running for testing the electromagnetic interference intensity.

[0022] In the above solution, before performing on-off control on the power module under test, the electromagnetic compatibility test device is adjusted to run for testing the electromagnetic interference intensity, so as to realize the electromagnetic interference scenario operation test of the power module under test.

[0023] In some embodiments, the method for determining the heat balance time includes: determining a first time interval according to the test environment temperature, the arm switch temperature limit, the arm switch loss, and the arm switch thermal resistance; determining a second time interval when the freewheeling current drops to zero according to the loop stray resistance and the inductance value of the adjustable load; determining the heat balance time according to the first time interval and the second time interval.

[0024] In the above solution, by combining the actual test scenario and the performance parameters of the power module under test, the heat balance time is analyzed and determined, making the heat balance time more matched with the power module under test, and improving the test accuracy and test reliability.

[0025] In some embodiments, the determining of the first time interval according to the test environment temperature, the arm switch temperature limit, the arm switch loss, and the arm switch thermal resistance includes: determining a temperature difference value according to the test environment temperature and the arm switch temperature limit; based on the arm switch loss and the arm switch thermal resistance, performing optimization analysis with the temperature difference value as a constraint to determine the first time interval.

[0026] In the above solution, by combining the test environment temperature, the arm switch temperature limit, the arm switch loss, and the arm switch thermal resistance for optimization analysis to determine the first time interval, the accuracy of the first time interval is improved.

[0027] In some embodiments, the determining of the second time interval when the freewheeling current drops to zero according to the loop stray resistance and the inductance value of the adjustable load includes: determining the second time interval when the freewheeling current drops to zero according to the loop stray resistance, the inductance value of the adjustable load, and a preset time constant model.

[0028] In the above solution, by combining the loop stray resistance, the inductance value of the adjustable load, and the preset time constant model for analysis and calculation to determine the second time interval, the accuracy of the second time interval is improved.

[0029] In some embodiments, determining the heat balance time according to the first time interval and the second time interval includes: when the first time interval is greater than or equal to the second time interval, analyzing and determining the heat balance time according to the first time interval; when the first time interval is less than the second time interval, analyzing and determining the heat balance time according to the second time interval.

[0030] In the above solution, according to the comparison and analysis result of the first time interval and the second time interval, the heat balance time is determined by the first time interval or the second time interval, which improves the accuracy of the heat balance time, and thus effectively improves the test reliability.

[0031] The present application also provides a power module test device, including: a switch control module, configured to send a double-pulse signal to the bridge arm switch device of the power module to be tested at a heat balance time interval when the test preparation is completed; wherein, the heat balance time represents the interval time between two double-pulse signals required for the power module to be tested to operate without heat accumulation; a test analysis module, configured to determine the test result according to the operation state parameters fed back by the power module to be tested.

[0032] The present application also provides a computer device, including a memory and a processor, where the memory stores a computer program, and when the processor executes the computer program, the steps of the above power module test method are implemented.

[0033] The present application also provides a computer-readable storage medium, on which a computer program is stored, and when the computer program is executed by a processor, the steps of the above power module test method are implemented.

[0034] The present application also provides a computer program product, including a computer program, and when the computer program is executed by a processor, the steps of the above power module test method are implemented. Description of the Drawings

[0035] By reading the detailed description of the preferred embodiments below, various other advantages and benefits will become clear to those of ordinary skill in the art. The drawings are only for the purpose of showing the preferred embodiments and are not considered to be a limitation of the present application. Moreover, in all the drawings, the same reference numerals are used to represent the same components. In the drawings:

[0036] Figure 1 It is a schematic structural diagram of a power module test system in some embodiments of the present application;

[0037] Figure 2 It is a schematic diagram of a double-pulse waveform in some embodiments of the present application;

[0038] Figure 3Schematic diagram of the power module test system in some other embodiments of the present application;

[0039] Figure 4 Schematic diagram of the power module to be tested in some other embodiments of the present application;

[0040] Figure 5 Schematic diagram of the power module test system in some other embodiments of the present application;

[0041] Figure 6 Schematic diagram of the power module test system in some other embodiments of the present application;

[0042] Figure 7 Schematic diagram of the power module test system in some other embodiments of the present application;

[0043] Figure 8 Schematic diagram of the power module test method process in some embodiments of the present application;

[0044] Figure 9 Schematic diagram of the power module test method process in some other embodiments of the present application;

[0045] Figure 10 Schematic diagram of the power module test method process in some other embodiments of the present application;

[0046] Figure 11 Schematic diagram of the power module test method process in some other embodiments of the present application;

[0047] Figure 12 Schematic diagram of the heat balance time determination process in some embodiments of the present application;

[0048] Figure 13 Schematic diagram of the power module test device in some embodiments of the present application;

[0049] Figure 14 Schematic diagram of the power module test device in some other embodiments of the present application;

[0050] Figure 15 Schematic diagram of the internal structure of the computer device in some embodiments of the present application. Detailed implementation manners

[0051] Hereinafter, embodiments of the technical solutions of the present application will be described in detail with reference to the accompanying drawings. The following embodiments are only used to illustrate the technical solutions of the present application more clearly, so they are only examples and cannot be used to limit the protection scope of the present application.

[0052] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the technical field to which this application belongs; the terms used herein are for the purpose of describing specific embodiments only and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above drawings are intended to cover non-exclusive inclusion.

[0053] In the description of the embodiments of this application, technical terms such as "first" and "second" are only used to distinguish different objects and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity, specific order or primary-secondary relationship of the indicated technical features. In the description of the embodiments of this application, the meaning of "a plurality of" is more than two, unless otherwise specifically defined.

[0054] Referring to "embodiments" herein means that the specific features, structures or characteristics described in connection with the embodiments may be included in at least one embodiment of this application. The phrase appearing in various positions in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art explicitly and implicitly understand that the embodiments described herein may be combined with other embodiments.

[0055] In the description of the embodiments of this application, the term "and / or" is only a description of the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B may represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " herein generally represents an "or" relationship between the associated objects before and after.

[0056] In the description of the embodiments of this application, the term "a plurality of" means more than two (including two). Similarly, "a plurality of groups" means more than two groups (including two groups), and "a plurality of pieces" means more than two pieces (including two pieces).

[0057] In the description of the embodiments of this application, unless otherwise clearly specified and limited, technical terms such as "install", "connect", "connect", "fix" and the like should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may also be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of this application can be understood according to specific circumstances.

[0058] At present, from the perspective of the development of the market situation, the application of energy storage systems is becoming more and more extensive, bringing great convenience in electricity use to daily production and life. In an energy storage system, a battery energy storage module is generally connected to an external power grid through a power module. Through the power module, the direct current of the battery energy storage module can be converted into alternating current for utilization, and the alternating current can also be converted into direct current and stored in the battery energy storage module. The reliable operation of the power module is of great significance for maintaining the operation of the energy storage system.

[0059] To achieve the reliable operation of the power module in the actual input scenario, generally a specific test device or test system is adopted at present to simulate the energy storage operation scenario of the power module and test the energy storage module. The actual operation scenario of the power module is relatively complex, and there are various different operating conditions of the power module. The current test devices or test systems cannot well simulate the actual operation scenario of the power module, and their tests cannot meet the actual operation requirements of the power module. Eventually, the obtained test results cannot accurately reflect the actual operation status of the power module.

[0060] To alleviate the problem that the test system cannot meet the actual operation requirements of the power module, through research, it is found that an adjustable load can be configured in the test system to simulate the loaded operation of the power module. By controlling the closing of some switching tubes of the power module and then inputting a double-pulse signal to control the on-off of another part of the switching tubes, various different operating conditions of the power module in the actual energy storage scenario can be simulated.

[0061] Based on the above considerations, the solution of the embodiment of the present application provides a power module test system. An adjustable load is used to access the first port of the power module to be tested to simulate the load during the actual operation of the power module to be tested, and a power supply device is used to access the second port of the power module to be tested to provide power support. Combined with the upper control device connected to the control end of the power module to be tested, a power module test system is built to test the power module to be tested. When the test preparation is completed, the upper control device sends double-pulse signals to the power module to be tested at intervals of the heat balance time, which represents the interval time of two double-pulse signals required for the power module to be tested to operate without heat accumulation, to control the power module to be tested to simulate the loaded current-carrying working condition operation. Finally, the test result is determined based on the operation state parameters fed back by the power module to be tested.

[0062] Through this solution, the upper control device sends double-pulse signals at intervals of the heat balance time to simulate the operation of the power module to be tested, and controls the on-off state of the switch without heat accumulation, so as to verify the actual operation of the power module to be tested and meet the actual operation requirements of the power module.

[0063] The power module test system provided by the embodiments of the present application can be applied to test systems for various power modules, including but not limited to testing power modules in scenarios such as energy storage systems and power supply systems. Further, the power module can be a half-bridge, full-bridge, or other topological structures, and no specific limitation is made. For the convenience of understanding the technical solution of the present application, the following embodiments can all be understood as the power module test system is used to test the power module in the energy storage valve sub-module in the energy storage system scenario.

[0064] Please refer to Figure 1 , the present application provides a power module test system, including: a power module under test 101, an adjustable load 103, an energy replenishment device 105, and an upper control device 107. The two ends of the adjustable load 103 are respectively connected to the first port of the power module under test 101, the two ends of the energy replenishment device 105 are respectively connected to the second port of the power module under test 101, and the upper control device 107 is connected to the control end of the power module under test 101. The upper control device 107 is configured to send a double-pulse signal to the power module under test 101 at a heat balance time interval when the test preparation is completed, and determine the test result according to the operating state parameters fed back by the power module under test 101; wherein, the heat balance time represents the interval time between two double-pulse signals required for the power module under test 101 to operate without heat accumulation.

[0065] Specifically, the power module under test 101 is a circuit module that can realize power conversion functions and is waiting to be tested. The adjustable load 103 is a device whose load size can be freely adjusted and is used to simulate the load connected in the power module's on-load current-carrying condition. The energy replenishment device 105 is a device used to provide electrical energy for the power module test system and maintain the long-term operation of the common module test system. The upper control device 107 is a control device with a double-pulse signal generation function and is configured with application programs related to the power module test method. The first port of the power module under test is, in an actual scenario, the port through which the power module under test is used to connect to other power modules or to the external power grid. The second port of the power module under test is, in an actual scenario, the port through which the power module under test is used to connect to the battery module. Specifically, the first port can be an AC port or a DC port according to the actual usage scenario of the power module under test, while the second port is a DC port.

[0066] Sending a double-pulse signal to the power module under test 101 at a heat balance time interval specifically means that after the upper control device 107 sends a double-pulse signal to the power module under test 101, it needs to wait for the heat balance time interval before sending the next double-pulse signal to the power module under test 101. The double-pulse signal is two consecutive pulse signals. For specific details, please refer to Figure 2, the first pulse signal includes a pulse high-level time T1 and a pulse low-level time T2, and T3 represents the high-level time of the second pulse signal. Therefore, under the action of the double-pulse signal, the switch tube controlled in the power module under test 101 can achieve the changes of conduction, turn-off, conduction, and turn-off, or achieve the changes of turn-off, conduction, turn-off, and conduction, which will vary depending on the type of the switch tube.

[0067] The heat balance time is the time required for the heat generation and heat dissipation to reach equilibrium when the power module under test 101 meets the operating requirements. After the power module under test 101 receives a double-pulse signal and operates, it will generate a certain amount of heat. At this time, by spacing the heat balance time, after the previously generated heat is completely dissipated, another double-pulse signal is issued. In this way, the power module under test 101 can operate without heat accumulation. By this method, the influence of the heat accumulation of the power module under test 101 on the test during the operation of the power module test system can be reduced, and the reliable operation test of the power module under test 101 without heat accumulation can be achieved.

[0068] It should be noted that the specific type of the adjustable load 103 is not unique. In a more detailed embodiment, the adjustable load 103 is a resistive load, which includes an inductive element. Specifically, it can be a coil or a transformer, etc. More specifically, in one embodiment, the adjustable load 103 can include a high-power inductor, that is, an inductor that can withstand a large current and has a large power. According to actual needs, the adjustable load 103 can include one inductor or multiple inductors connected in series and / or in parallel, and the specific is not limited. In other embodiments, the adjustable load 103 can also adopt a resistive load, etc., as long as it can simulate the load types that may be connected during the actual operation of the power under test.

[0069] The specific type of the energy supplement device 105 is not unique either. Any DC power supply that can provide power support for the operation of the power module under test 101 is acceptable. For example, in a more detailed embodiment, the energy supplement device 105 includes an adjustable DC power supply, that is, a power supply device that converts the power of the industrial frequency power grid into a special form of high-voltage power supply and the output voltage can be adjusted. In other embodiments, a constant-current power supply or other methods can also be used as the energy supplement device 105, and the specific is not limited.

[0070] In the solution of the embodiment of the present application, in a test system formed by using an adjustable load 103, an energy replenishment device 105, and an upper control, after connecting the power module 101 to be tested and completing relevant test preparations, the upper control device 107 will be turned on and send double-pulse signals to the power module 101 to be tested at intervals with a heat balance time, so as to simulate the operation of the power module 101 to be tested in the actual scenario. Under different operating conditions, the upper control device 107 continuously interacts with the power module 101 to be tested and obtains the operating state parameters feedback by the power module 101 to be tested under different operating conditions. Then, it analyzes whether each operating state parameter has an error, and finally determines the test result based on the analysis result to complete the reliable operation test of the power module 101 to be tested.

[0071] It can be understood that in the actual test scenario, to better reflect the long-term operating state of the power module 101 to be tested, the test duration can be configured in the upper control device 107. After the preparation is completed, the upper control device 107 uses the test duration as a reference and continuously sends double-pulse signals to the power module 101 to be tested at intervals with a heat balance time within the entire test duration. Moreover, within the test duration, the upper control device 107 continuously analyzes according to the operating state parameters feedback by the power module 101 to be tested, and determines the final test result based on the operating state parameters received within the test duration, effectively improving the accuracy of the test result.

[0072] In the above power module test system, the adjustable load 103 is used to connect to the first port of the power module 101 to be tested to simulate the load during the actual operation of the power module 101 to be tested, and the energy replenishment device 105 is used to connect to the second port of the power module 101 to be tested to provide power support. Combined with the upper control device 107 connected to the control end of the power module 101 to be tested, a power module test system is formed to test the power module 101 to be tested. Specifically, when the test preparation is completed, the upper control device 107 sends double-pulse signals to the power module 101 to be tested at intervals with a heat balance time, which represents the interval time between two double-pulse signals required for the power module 101 to be tested to operate without heat accumulation, and controls the power module 101 to be tested to simulate the operation condition of carrying current with load. Finally, the test result is determined based on the operating state parameters feedback by the power module 101 to be tested. Through this solution, the upper control device 107 sends double-pulse signals at intervals with a heat balance time to simulate the operation of the power module 101 to be tested, and controls the on-off state of the switch without heat accumulation, so as to verify the actual operation of the power module 101 to be tested and meet the actual operation requirements of the power module.

[0073] Please refer to Figure 3, in some embodiments, the power module 101 to be tested includes a power circuit 301 and a DC capacitor C. The first end of the DC capacitor C is connected to the first end of the upper-bridge-arm switching device 3011 of the power circuit 301 and the first end of the energy supplement device 105, and the second end of the DC capacitor C is connected to the first end of the lower-bridge-arm switching device 3012 of the power circuit 301 and the second end of the energy supplement device 105. The second end of the upper-bridge-arm switching device 3011 is connected to the second end of the lower-bridge-arm switching device 3012, and the third ends of the upper-bridge-arm switching device 3011 and the lower-bridge-arm switching device 3012 are respectively connected to the upper control device 107. Wherein, the first end and the second end of the adjustable load 103 are respectively connected to the first end and the second end of the upper-bridge-arm switching device 3011, or the first end and the second end of the adjustable load 103 are respectively connected to the first end and the second end of the lower-bridge-arm switching device 3012.

[0074] Specifically, the power circuit 301 is a circuit built by power switching devices to achieve power conversion functions. The DC capacitor C is a capacitor that is connected in parallel between the power circuit 301 and the energy storage module in the energy storage valve sub-module to achieve DC support. The bridge-arm switching device is a device built by power switching devices in the power circuit 301 and serving as the bridge arm of the power circuit 301. In the solution of this embodiment, the number of bridge-arm switching devices is specifically set to two, which are respectively named the upper-bridge-arm switching device 3011 and the lower-bridge-arm switching device 3012. The second end of the upper-bridge-arm switching device is connected to the second end of the lower-bridge-arm switching device 3012, that is, the two are connected in series.

[0075] In an actual test scenario, the adjustable load 103 can be connected to the first end and the second end of the upper-bridge-arm switching device 3011. In this way, the upper-bridge-arm switching device 3011 can be controlled by the upper control device 107 to be in the off state, and a double-pulse signal can be input to the lower-bridge-arm switching device 3012 to make the lower-bridge-arm switching device 3012 conduct alternately. Thus, when the first end and the second end of the upper-bridge-arm switching device 3011 are used as the first port of the power module 101 to be tested, the operating conditions of the power module 101 to be tested can be simulated.

[0076] In another embodiment, it can also be that the adjustable load 103 is connected to the first end and the second end of the lower-bridge-arm switching device 3012. In this way, the lower-bridge-arm switching device 3012 can be controlled by the upper control device 107 to be in the off state, and a double-pulse signal can be input to the upper-bridge-arm switching device 3011 to make the upper-bridge-arm switching device 3011 conduct alternately. Thus, when the first end and the second end of the lower-bridge-arm switching device 3012 are used as the first port of the power module 101 to be tested, the operating conditions of the power module 101 to be tested can be simulated.

[0077] It should be noted that the specific structures of the upper-bridge-arm switching device 3011 and the lower-bridge-arm switching device 3012 are not unique. In a more detailed embodiment, both the upper-bridge-arm switching device 3011 and the lower-bridge-arm switching device 3012 include a power switching device, namely Figure 3 Q1 and Q2 shown. In other embodiments, the upper-bridge-arm switching device 3011 and the lower-bridge-arm switching device 3012 may also include multiple power switching devices connected in series and / or in parallel, and no specific limitation is made.

[0078] More specifically, the upper-bridge-arm switching device 3011 and the lower-bridge-arm switching device 3012 further include freewheeling diodes. The freewheeling diode D1 is reversely connected in parallel between the first end and the second end of the power switching device Q1 of the upper-bridge-arm switching device 3011, and the freewheeling diode D2 is reversely connected in parallel between the first end and the second end of the power switching device Q2 of the lower-bridge-arm switching device 3012, and no further elaboration is made here.

[0079] It can be understood that the specific type of the power switching device is not unique and can be a triode, a field effect transistor, an IGBT (Insulate-Gate Bipolar Transistor), etc., and no specific limitation is made. For the convenience of understanding the technical solution of the present application, in the following embodiments, it can be understood that the upper-bridge-arm switching device 3011 and the lower-bridge-arm switching device 3012 respectively include an IGBT.

[0080] In the above solution, in the power module 101 to be measured with a half-bridge structure, the adjustable load 103 can be connected to the first end and the second end of the upper-bridge-arm switching device 3011, or the first end and the second end of the lower-bridge-arm switching device 3012, so as to realize the reliable operation test of the upper-bridge-arm switching device 3011 and the lower-bridge-arm switching device 3012, and has the advantage of high comprehensiveness.

[0081] It should be noted that the above embodiments are specifically explained by taking the power circuit with a half-bridge structure as an example. In other embodiments, it may also be a power circuit with a full-bridge structure or other topological power circuits 301. Correspondingly, reference can be made to Figure 4 In the power circuit 301 with a full-bridge structure, according to the detailed difference between the working principles of the full-bridge structure and the half-bridge structure, two power switching tubes at opposite corners can be first controlled to be in the off state, and then a double-pulse signal is input to the two switching tubes at the other opposite corner to control the two power switching tubes to conduct and turn off simultaneously, simulating the load current-carrying condition of the power module 101 to be measured, which will not be elaborated here.

[0082] Please refer to Figure 5, in some embodiments, the power module 101 to be tested further includes a sub-module control board 501 and a drive board 502 that are communicatively connected. The sub-module control board 501 is communicatively connected to the upper control device 107. The third ends of the upper-bridge-arm switching device 3011 and the lower-bridge-arm switching device 3012 are respectively connected to the drive board 502.

[0083] Specifically, the sub-module control board 501 is a functional board card used to perform switching control on the energy storage valve sub-module where the power module 101 to be tested is located. The drive board 502 is a board card that sends drive signals to each switching device to drive the switching device to act during the switching control process of the sub-module control board 501. The specific type of the upper control device 107 is not unique and may include a personal computer, a tablet computer, an industrial control computer, etc., and is not specifically limited.

[0084] In the solution of this embodiment, the upper control device 107, the sub-module controller, and the drive board 502 are specifically selected to jointly build the control architecture of the power circuit 301, so as to realize the issuance of other drive control signals such as double-pulse signals, and the acquisition and feedback of relevant operating state parameters. In this way, the actual energy storage system operation scenario of the power module 101 to be tested is simulated, and more accurate testing of the power module 101 to be tested is realized.

[0085] In the above solution, the power module 101 to be tested further includes a sub-module control board 501 and a drive board 502 that are communicatively connected. The upper control device 107 can not only test the operation reliability of the power circuit 301, but also simulate the actual operation scenario of the power module 101 to be tested, realize the communication reliability test between the power circuit 301, the sub-module control board 501, and the drive board 502, and improve the test reliability.

[0086] In some embodiments, the power circuit 301 further includes a bypass switch. The drive board 502 includes a bypass switch drive board and a power switch drive board. The first end and the second end of the bypass switch are respectively connected to the first end and the second end of the adjustable load 103. The bypass switch drive board is connected to the third end of the bypass switch. The third ends of the upper-bridge-arm switching device 3011 and the lower-bridge-arm switching device 3012 are respectively connected to the power switch drive board.

[0087] Specifically, in the solution of this embodiment, the power circuit 301 of the power module 101 to be tested can also be provided with a bypass switch. The bypass switch and the bridge-arm switching device are respectively provided with different drive boards 502, that is, the bypass switch drive board and the power switch drive board. In this way, the bypass operation of the power module 101 to be tested can also be simulated through the bypass switch, and the reliability test of the power module 101 to be tested in the bypass operation state can be realized.

[0088] In the above solution, the power circuit 301 further includes a bypass switch. The bypass switch and the leg switch device of the power circuit 301 are respectively driven by different types of drive boards 502, so as to simulate a test system that more closely matches the actual operation scenario of the power circuit 301 and improve the test accuracy.

[0089] In some embodiments, the power module test system further includes a temperature detector communicatively connected to the upper control device 107. The temperature detector is disposed on the power module 101 to be tested. Specifically, the structure of the power module 101 to be tested is as shown in the above embodiments. Correspondingly, the temperature detector can be disposed at least at one of the power circuit 301, the sub-module control board 501, and the drive board 502.

[0090] Specifically, in the solution of the embodiment of the present application, the power module test system further includes a temperature detector. Through the temperature detector, the temperature of relevant devices in the power module 101 to be tested during the test process can be monitored, and the temperature parameters are obtained and sent to the upper control device 107. The upper control device 107 analyzes through the received temperature parameters to determine whether the operating temperature of the power module 101 to be tested is normal during the test process, enriching the test items of the power module test system.

[0091] In the above solution, the power module test system further includes a temperature detector. Through the temperature detector, the operating temperature of one or more of the power circuit 301, the sub-module control board 501, and the drive board 502 during the test process can be monitored, further improving the test reliability.

[0092] Please refer to Figure 6 , in some embodiments, the power module test system further includes an oscilloscope 601. The oscilloscope 601 is connected to the power module 101 to be tested.

[0093] Specifically, the oscilloscope 601 is a device that converts an electrical signal into an image signal for the study of electrical phenomena. In the solution of this embodiment, the reliability detection of the power module 101 to be tested operating in a simulated load-carrying and current-carrying condition is realized through the detection and analysis of the upper control device 107. In order to facilitate the tester to intuitively understand the changes in electrical parameters of different parts of the power module 101 to be tested when operating in a simulated load-carrying and current-carrying condition, the oscilloscope 601 can be connected to the power module 101 to be tested.

[0094] It should be noted that, according to different actual test requirements, the position where the oscilloscope 601 is connected to the power module 101 to be tested is not unique. In one embodiment, the oscilloscope 601 can be connected to the third end of the upper leg switch device 3011 and / or the third end of the lower leg switch device 3012 of the power circuit 301 in the power module 101 to be tested, so as to monitor the double-pulse signal input to the leg switch device.

[0095] In another embodiment, an oscilloscope 601 can also be connected between the adjustable load 103 and the second end of the lower-bridge-arm switching device 3012, or between the adjustable load 103 and the second end of the upper-bridge-arm switching device 3011, so as to monitor the current flowing into the adjustable load 103 during the test process.

[0096] In the above solution, the oscilloscope 601 is connected to the power module 101 to be tested, and the operating state of the power module 101 to be tested during the test process is monitored, so as to obtain the device characteristics of the power module 101 to be tested under different test environments and different time nodes, further improving the test reliability.

[0097] In some embodiments, the power module test system further includes an incubator connected to the upper control device 107, and the power module 101 to be tested is disposed inside the incubator.

[0098] Specifically, the incubator, that is, the internal environmental temperature, can be adjusted according to actual needs, so as to simulate a box body with high and low temperature environments. In the solution of this embodiment, the upper control device 107 is connected to the incubator. Specifically, the upper control device 107 is communicatively connected to the controller of the incubator, so as to realize the adjustment and monitoring of the internal environmental temperature of the incubator. The power module 101 to be tested is disposed inside the incubator, and by adjusting the internal environmental temperature of the incubator, the power module 101 to be tested can operate in different temperature environments, simulating the actual operating temperature scenario of the power module 101 to be tested for testing.

[0099] It should be noted that, in one embodiment, it is also possible to simultaneously dispose the adjustable load 103, the energy replenishing device 105, and the power module 101 to be tested inside the incubator, and test the reliable operation of the power module 101 to be tested at different environmental temperatures by adjusting the internal environmental temperature of the incubator.

[0100] It can be understood that, in one embodiment, the upper control device 107 can control the incubator to operate at different internal environmental temperatures, simulating the high and low temperature operating environments of the power module 101 to be tested. The operating reliability of the power module 101 to be tested in the high and low temperature operating environments can be detected and analyzed by the incubator, and finally the incubator sends the detection and analysis results to the upper control device 107. In another embodiment, it is also possible that the incubator sends the relevant state parameters of the power module 101 to be tested in the high and low temperature operating environments to the upper control device 107, and the upper control device 107 analyzes and determines the detection results, which are not specifically limited.

[0101] The solution of this embodiment can complete the long-term high and low temperature operation or aging test of the power module 101 under test in the simulated load-carrying current-carrying condition while ensuring that the device does not experience thermal runaway according to the difference between the ambient temperature and the device temperature limit. Further, it can also be monitored by an oscilloscope 601 to obtain the device characteristics at different time nodes under continuous high temperature.

[0102] In the above solution, the power module 101 under test is placed in an incubator, and the test environment temperature is adjusted by the incubator to simulate the high and low temperature operation scenarios of the power module 101 under test, so as to realize the operation reliability test of the power module 101 under test in high and low temperature scenarios.

[0103] Please refer to Figure 7 , in some embodiments, the power module test system further includes an electromagnetic compatibility test device 701 communicatively connected to the upper control device 107.

[0104] Specifically, the electromagnetic compatibility (EMC) test device is a device for analyzing whether the device or system under test can operate normally in an electromagnetic environment. In the solution of this embodiment, considering that the power environment where the power module 101 under test is located is generally relatively complex, there will inevitably be electromagnetic interference phenomena. Therefore, in the actual test scenario, the electromagnetic compatibility test device 701 is also connected to the upper control device 107. During the process of the upper control device 107 controlling the power module 101 under test to start the simulated load-carrying current-carrying condition for testing, the electromagnetic compatibility test device 701 provides an electromagnetic interference environment for the power module 101 under test, etc. Combining the operation state parameters fed back by the power module 101 under test, it is analyzed and judged whether the power module 101 under test can operate normally in the current electromagnetic interference environment.

[0105] It should be noted that in one embodiment, the upper control device 107 can control the electromagnetic compatibility test device 701 to operate at different electromagnetic interference intensities to simulate the electromagnetic interference operation environment of the power module 101 under test. Whether the power module 101 under test can operate normally in the electromagnetic interference operation environment can be detected and analyzed by the electromagnetic compatibility test device 701, and finally the detection and analysis results are sent by the electromagnetic compatibility test device 701 to the upper control device 107. In other embodiments, it can also be that the electromagnetic compatibility test device 701 sends the relevant state parameters of the power module 101 under test in the electromagnetic interference operation environment to the upper control device 107, and the upper control device 107 analyzes and determines the detection results, which are not specifically limited.

[0106] It can be understood that in one embodiment, when the power module 101 to be tested conducts relevant tests according to the electromagnetic compatibility test device 701, the electromagnetic interference signal sent by the electromagnetic compatibility test device 701 to the upper control device 107 can be synchronized with the double-pulse signal sent by the upper control device 107 to the power module 101 to be tested. That is, in the solution of this embodiment, the electromagnetic interference signal and the double-pulse signal are periodically synchronized. While the electromagnetic compatibility test device 701 sends the electromagnetic interference signal to the upper control device 107, the upper control device 107 sends the double-pulse signal to the power module 101 to be tested, so as to achieve the coupling of external strong electromagnetic interference and internal switch switching, and verify the operation stability of the power module 101 to be tested in a harsh environment. It should be noted that in other embodiments, the electromagnetic interference signal and the double-pulse signal can also be sent asynchronously. For example, the electromagnetic interference signal is continuously sent, and the double-pulse signal is sent according to the heat balance time, and the specific selection can be made in combination with actual requirements.

[0107] In the above solution, the upper control device 107 is communicatively connected to the electromagnetic compatibility test device 701, so as to simulate the electromagnetic interference operation scenario of the power module 101 to be tested and realize the operation reliability test of the power module 101 to be tested under the electromagnetic interference scenario.

[0108] Please refer to Figure 8 , this application also provides a power module test method, including step 802, step 804 and step 806.

[0109] Step 802, when the test preparation is completed, send double-pulse signals to the bridge arm switching device of the power module to be tested at intervals of the heat balance time.

[0110] Step 804, determine the test result according to the operation state parameters fed back by the power module to be tested.

[0111] Specifically, the power module test method is implemented based on the above embodiment and the power module test system shown in the drawings. The heat balance time represents the interval time between two double-pulse signals required for the power module 101 to be tested to operate without heat accumulation. The first port of the power module 101 to be tested is connected to the adjustable load 103, and the second port of the power module 101 to be tested is connected to the energy supplement device 105.

[0112] The completion of test preparation means that the power module 101 to be tested has completed the setup of the test environment and is ready to start the test of simulating the on-load current-carrying condition at any time. According to different real-time test requirements, the method for judging whether the test preparation is completed is also different. In a more detailed embodiment, it can be considered that the test preparation is completed when the power module 101 to be tested is connected to the adjustable load 103, the energy replenishment device 105, and the upper control device 107, that is, when the power module test system is set up. In other embodiments, it can also be considered that the test preparation is completed when the power module test system is set up and the power module 101 to be tested is adjusted to enter the required test environment (such as temperature environment or electromagnetic environment, etc.).

[0113] When the test preparation is completed, the upper control device 107 will be turned on and send double-pulse signals to the arm switch device of the power module 101 to be tested at intervals of the heat balance time. By controlling the on-off of the arm switch device, the operation condition of the power module 101 to be tested in the actual scenario is simulated. Under different operation conditions, the upper control device 107 continuously interacts with the power module 101 to be tested to obtain the operation state parameters feedback by the power module 101 to be tested under different operation conditions. Then, it analyzes whether each operation state parameter is in error, and finally determines the test result based on the analysis result to complete the reliable operation test of the power module 101 to be tested.

[0114] In the actual test scenario, to better reflect the long-term operation state of the power module 101 to be tested, the test duration can be configured in the upper control device 107. After the preparation is completed, the upper control device 107 uses the test duration as a reference and continuously sends double-pulse signals to the power module 101 to be tested at intervals of the heat balance time throughout the test duration. Moreover, within the test duration, the upper control device 107 continuously analyzes according to the operation state parameters feedback by the power module 101 to be tested, and determines the final test result based on the operation state parameters received within the test duration, effectively improving the accuracy of the test result.

[0115] In the above power module test method, the upper control device 107 sends double-pulse signals at intervals of the heat balance time to simulate the operation condition of the power module 101 to be tested, and controls the on-off state of the switch without heat accumulation, so as to verify the actual operation condition of the power module 101 to be tested and meet the actual operation requirements of the power module.

[0116] In some embodiments, the power module 101 to be measured includes a power circuit 301 and a DC capacitor C. The power circuit 301 includes an upper-bridge-arm switching device 3011 and a lower-bridge-arm switching device 3012. Sending a double-pulse signal to the power module 101 to be measured at a heat balance time interval includes: when the first end and the second end of the adjustable load 103 are respectively connected to the first end and the second end of the upper-bridge-arm switching device 3011, controlling the upper-bridge-arm switching device 3011 to turn off, and sending a double-pulse signal to the lower-bridge-arm switching device 3012 at the heat balance time interval; when the first end and the second end of the adjustable load 103 are respectively connected to the first end and the second end of the lower-bridge-arm switching device 3012, controlling the lower-bridge-arm switching device 3012 to turn off, and sending a double-pulse signal to the upper-bridge-arm switching device 3011 at the heat balance time interval.

[0117] Specifically, in the solution of this embodiment, taking the power module 101 to be measured as a half-bridge power module as an example for explanation, when the first end and the second end of the adjustable load 103 are respectively connected to the first end and the second end of the upper-bridge-arm switching device 3011, that is, taking the first end and the second end of the upper-bridge-arm switching device 3011 as the first port of the power module 101 to be measured. During the actual operation process, the upper-bridge-arm switching device 3011 is in the off state, and the charge and discharge operation is realized through the on and off of the lower-bridge-arm switching device 3012. Therefore, in this case, to simulate the load-carrying current-carrying working condition of the power module 101 to be measured, the upper-bridge-arm switching device 3011 can be controlled by the upper control device 107 to be in the off state, and a double-pulse signal is input to the lower-bridge-arm switching device 3012 to make the lower-bridge-arm switching device 3012 conduct alternately.

[0118] When the first end and the second end of the adjustable load 103 are respectively connected to the first end and the second end of the lower-bridge-arm switching device 3012, that is, taking the first end and the second end of the lower-bridge-arm switching device 3012 as the first port of the power module 101 to be measured. During the actual operation process, the lower-bridge-arm switching device 3012 is in the off state, and the charge and discharge operation is realized through the on and off of the upper-bridge-arm switching device 3011. Therefore, in this case, to simulate the load-carrying current-carrying working condition of the power module 101 to be measured, the lower-bridge-arm switching device 3012 can be controlled by the upper control device 107 to be in the off state, and a double-pulse signal is input to the upper-bridge-arm switching device 3011 to make the upper-bridge-arm switching device 3011 conduct alternately.

[0119] In the above solution, in the power module 101 to be tested with a half-bridge structure, the adjustable load 103 can be connected to the first end and the second end of the upper-bridge-arm switching device 3011, or the first end and the second end of the lower-bridge-arm switching device 3012 respectively. By controlling one bridge-arm switching device to disconnect and the other bridge-arm switching device to alternately conduct and disconnect under a double-pulse signal, the operation of the power module 101 to be tested with a half-bridge structure is simulated, and the test of the power module 101 to be tested with a half-bridge structure is realized.

[0120] Please refer to Figure 9 , in some embodiments, before step 802, the method further includes step 902.

[0121] Step 902, controlling the temperature chamber connected to the upper control device to operate at the test temperature.

[0122] Specifically, in the solution of this embodiment, the upper control device 107 is connected to the temperature chamber, that is, the upper control device 107 is communicatively connected to the controller of the temperature chamber, so as to realize the adjustment and monitoring of the internal environmental temperature of the temperature chamber. The power module 101 to be tested is arranged inside the temperature chamber, and by adjusting the internal environmental temperature of the temperature chamber, the power module 101 to be tested is made to operate in different temperature environments, simulating the actual operating temperature scenario of the power module 101 to be tested for testing.

[0123] Therefore, before controlling the on / off of the bridge-arm switch in the control power circuit 301, it is necessary to complete the preparation of the test environment temperature, that is, to control the temperature chamber to operate at the required test temperature. It can be understood that the magnitude of the test temperature is not unique, and it can be set higher or lower than room temperature to simulate the high and low temperature operation of the power module 101 to be tested, and no specific limitation is made. In this way, through the solution of this embodiment, the reliability test of the power module 101 to be tested in a high and low temperature operating environment can be realized.

[0124] In the above solution, before performing on / off control on the power module 101 to be tested, the temperature chamber is adjusted to operate at the test temperature, so as to realize the high and low temperature scenario operation test of the power module 101 to be tested.

[0125] Please refer to Figure 10 , in some embodiments, before step 802, the method further includes step 1002.

[0126] Step 1002, controlling the electromagnetic compatibility test device communicatively connected to the upper control device to start running for testing the electromagnetic interference intensity.

[0127] Specifically, in the solution of this embodiment, considering that the power environment where the power module 101 to be measured is located is generally relatively complex, electromagnetic interference is inevitable. Therefore, in the actual test scenario, an electromagnetic compatibility test device 701 is also connected to the upper control device 107. During the process of the upper control device 107 controlling the power module 101 to be measured to start the simulated load-carrying current-carrying condition for testing, the electromagnetic compatibility test device 701 provides an electromagnetic interference environment for the power module 101 to be measured and the like. Combining the operating state parameters fed back by the power module 101 to be measured, it is analyzed and judged whether the power module 101 to be measured can operate normally under the current electromagnetic interference environment.

[0128] When the power module 101 to be measured performs relevant tests according to the electromagnetic compatibility test device 701, the electromagnetic interference signal sent by the electromagnetic compatibility test device 701 to the upper control device 107 can be synchronized with the double-pulse signal sent by the upper control device 107 to the power module 101 to be measured. That is, in the solution of this embodiment, the electromagnetic interference signal and the double-pulse signal are periodically synchronized. While the electromagnetic compatibility test device 701 sends an electromagnetic interference signal to the upper control device 107, the upper control device 107 sends a double-pulse signal to the power module 101 to be measured, so as to achieve the coupling of external strong electromagnetic interference and internal switch switching, and verify the operating stability of the power module 101 to be measured in a harsh environment.

[0129] In the above solution, before performing on-off control on the power module 101 to be measured, the electromagnetic compatibility test device 701 is adjusted to operate to test the electromagnetic interference intensity, so as to realize the electromagnetic interference scenario operation test of the power module 101 to be measured.

[0130] In some embodiments, the operating state parameters include at least one of the bypass switch state parameter, the arm switch state parameter, the capacitor voltage, and the device temperature parameter of the power module 101 to be measured.

[0131] Specifically, the bypass switch state parameter is the operating state of the bypass switch when the power module 101 to be measured operates in the simulated load-carrying current-carrying condition, including but not limited to the switch state of the bypass switch. The arm switch state parameter is the on-off conversion state of the arm switch device under the action of the turn-off control signal or the double-pulse signal. The capacitor voltage is the voltage value across the DC capacitor C during the process of the arm switch device turning on and off the simulated load-carrying current-carrying condition. The device temperature parameter is the temperature change of the relevant devices in the power module 101 to be measured during the process of the arm switch device turning on and off the simulated load-carrying current-carrying condition, including at least one of the temperature of the arm switch device, the temperature of the drive board 502, and the temperature of the sub-module control board 501.

[0132] In the specific testing process, one or more of the bypass switch status parameters, arm switch status parameters, capacitor voltage, and device temperature parameters can be selected as the operating status parameters according to the actual testing requirements, so as to analyze the test results of the power module 101 to be tested. More specifically, in one embodiment, the operating status parameters simultaneously include the bypass switch status parameters, arm switch status parameters, capacitor voltage, and device temperature parameters, and the upper control device 107 analyzes the test results according to these parameters simultaneously, with relatively high analysis accuracy.

[0133] In the above solution, according to the actual testing requirements, one or more of the bypass switch status parameters, arm switch status parameters, capacitor voltage, and device temperature parameters of the power module 101 to be tested in the test scenario can be monitored, so as to verify whether the power module 101 to be tested can operate normally in the current test scenario, with relatively high testing flexibility.

[0134] Please refer to Figure 11 , in some embodiments, step 804 includes step 122 and step 124.

[0135] Step 112, when the operating status parameters fed back by the power module to be tested within the test time range do not have errors, it is determined that the power module to be tested passes the test.

[0136] Step 114, when the operating status parameters fed back by the power module to be tested within the test time range have errors, it is determined that the power module to be tested fails the test.

[0137] Specifically, the test time range is the test duration required for the power module 101 to be tested to simulate the on-load current-carrying working condition during testing. In the actual test scenario, to better reflect the long-term operating status of the power module 101 to be tested, the test duration can be configured in the upper control device 107. After preparation, the upper control device 107 uses the test duration as a reference basis and continuously sends double-pulse signals to the power module 101 to be tested at the heat balance time interval throughout the test duration. Moreover, within the test duration, the upper control device 107 continuously analyzes the operating status parameters fed back by the power module 101 to be tested, and determines the final test result based on the operating status parameters received within the test duration, effectively improving the accuracy of the test result.

[0138] During the entire test duration, while the upper control device 107 controls the on / off of the leg switch device, it can also receive in real time one or more of the bypass switch status parameters, leg switch status parameters, capacitor voltage, and device temperature parameters. Based on this, it is judged whether there will be situations such as switch misoperation, false fault reporting, abnormal change of capacitor voltage, or too high device temperature. As long as any of the above situations occurs, that is, the operating state parameters are incorrect, it is considered that the test of the power module 101 to be tested fails.

[0139] In the above solution, by comparing and analyzing the operating state parameters obtained within the test time range, it is verified whether the power module 101 to be tested has an operating error within the test time range, that is, whether it passes the test, which can effectively improve the test accuracy.

[0140] It can be referred to in combination with Figure 12 , in some embodiments, the method for determining the heat balance time includes: determining a first time interval (Δt1) according to the test environment temperature, the leg switch temperature limit, the leg switch loss, and the leg switch thermal resistance; determining a second time interval (Δt2) when the freewheeling current drops to zero according to the loop stray resistance and the inductance value of the adjustable load 103; determining the heat balance time (Δtmin) according to the first time interval and the second time interval.

[0141] Specifically, the leg switch temperature limit is the maximum temperature that the power switch device in the leg switch device can withstand. At this temperature, the power switch device can work normally without overheating or damage. The leg switch loss is also the energy loss generated by the power switch device in the leg switch device due to the on or off action. The leg switch thermal resistance is also the relationship between the heat generated when current passes through the power switch device in the leg switch device and the device temperature. The unit of thermal resistance is degrees Celsius per watt (℃ / W), indicating the degree of increase in device temperature when one watt of power passes through the device. The smaller the thermal resistance, the better the heat dissipation ability of the device and the slower the temperature rise. The loop stray resistance is the parasitic resistance of the diode freewheeling loop.

[0142] The heat balance time can be freely adjusted through the upper control device 107 according to requirements, so as to meet the requirements that the power module 101 to be tested can turn on and off the pulsed current without heat accumulation under different operating conditions. Due to system limitations, the time interval between two double-pulse signals (that is, the heat balance time) is limited by the following two factors: one is limited by the required junction temperature of the device, that is, the heat generated by the leg switch loss, etc. should reach system thermal balance with the heat of natural heat dissipation without heat accumulation. The other is limited by the minimum double-pulse time interval when the freewheeling current of the diode (the diode connected in antiparallel to each power switch device in the leg switch device) drops to 0.

[0143] Therefore, in the solution of this embodiment, first, the test environment temperature, the temperature limit of the bridge arm switch, the loss of the bridge arm switch, and the thermal resistance of the bridge arm switch are obtained, and combined with the first limiting factor for analysis to determine the first time interval. And the loop stray resistance and the inductance value of the adjustable load 103 are obtained, and combined with the second limiting factor for analysis to determine the second time interval when the freewheeling current drops to zero. Finally, according to the first time interval and the second time interval, the heat balance time is determined.

[0144] The above solution combines the actual test scenario and the performance parameters of the power module 101 to be tested, analyzes and determines the heat balance time, makes the heat balance time more matched with the power module 101 to be tested, and improves the test accuracy and test reliability.

[0145] In some embodiments, determining the first time interval according to the test environment temperature, the temperature limit of the bridge arm switch, the loss of the bridge arm switch, and the thermal resistance of the bridge arm switch includes: determining the temperature difference value according to the test environment temperature and the temperature limit of the bridge arm switch; based on the loss of the bridge arm switch and the thermal resistance of the bridge arm switch, performing optimization analysis with the temperature difference value as a constraint to determine the first time interval.

[0146] Specifically, in the actual test scenario, the heat generation of the power module 101 to be tested depends on the pulse width and period of the double-pulse signal. Therefore, by performing optimization calculations with the junction temperature limit of the device as the objective function, the first time interval can be obtained. Specifically, the upper control device 107 subtracts the real-time collected ambient temperature from the temperature limit of the bridge arm switch to obtain the temperature difference value. Then, based on the loss formula of the bridge arm switch (including conduction loss and turn-off loss) and the thermal resistance of the bridge arm switch, optimization analysis is performed with the temperature difference value as a constraint condition, and finally the first time interval is determined.

[0147] The above solution combines the test environment temperature, the temperature limit of the bridge arm switch, the loss of the bridge arm switch, and the thermal resistance of the bridge arm switch for optimization analysis to determine the first time interval, improving the accuracy of the first time interval.

[0148] In some embodiments, determining the second time interval when the freewheeling current drops to zero according to the loop stray resistance and the inductance value of the adjustable load 103 includes: determining the second time interval when the freewheeling current drops to zero according to the loop stray resistance, the inductance value of the adjustable load 103, and a preset time constant model.

[0149] Specifically, the preset time constant model is a preset empirical formula when the freewheeling current of the freewheeling diode loop drops to 0. In the test system built in the embodiment of the present application, the adjustable load 103 includes an inductor. Therefore, the freewheeling diode loop can be approximately regarded as a first-order zero-input response circuit composed of the adjustable load 103 and the loop stray resistance. At this time, the time constant of the freewheeling diode loop Analyze and calculate in combination with the empirical formula when the freewheeling current of the freewheeling diode circuit drops to 0, and the second time interval can be determined.

[0150] It should be noted that the specific type of the preset time constant model is not unique. In a more detailed embodiment, the preset time constant model includes That is where Δt2 represents the second time interval, L represents the inductance value of the adjustable load 103, and rs represents the loop stray resistance.

[0151] In the above solution, analyze and calculate in combination with the loop stray resistance, the inductance value of the adjustable load 103, and the preset time constant model to determine the second time interval, and improve the accuracy of the second time interval.

[0152] In some embodiments, according to the first time interval and the second time interval, determine the heat balance time, including: in the case where the first time interval is greater than or equal to the second time interval, analyze and determine the heat balance time according to the first time interval; in the case where the first time interval is less than the second time interval, analyze and determine the heat balance time according to the second time interval.

[0153] Specifically, after obtaining the first time interval and the second time interval, the upper control device 107 further analyzes the magnitude relationship between the two, and performs analysis and calculation with the larger of the two to determine the heat balance time.

[0154] It should be noted that the method of analyzing and determining the heat balance time according to the first time interval or analyzing and determining the heat balance time according to the second time interval is not unique. In a detailed embodiment, two analysis models can be set respectively. In the case where the first time interval is greater than or equal to the second time interval, substitute the first time interval into the corresponding analysis model for analysis and calculation to obtain the heat balance time; in the case where the first time interval is less than the second time interval, substitute the second time interval into the corresponding analysis model for calculation to obtain the heat balance time.

[0155] Further, in a more detailed embodiment, the analysis model includes and where Δt1 represents the first time interval, Δt2 represents the second time interval, and k represents the reliability coefficient. In the case where the first time interval is greater than or equal to the second time interval, combine Calculate to obtain the heat balance time Δtmin; in the case where the first time interval is less than the second time interval, combine Calculate to obtain the heat balance time Δtmin.

[0156] According to the comparison and analysis results of the first time interval and the second time interval, the heat balance time is determined by the first time interval or the second time interval, which improves the accuracy of the heat balance time and effectively improves the test reliability.

[0157] To facilitate the understanding of the technical solution of the present application, the present application will be explained below in conjunction with relatively detailed embodiments.

[0158] The power module 101 to be tested includes a power circuit 301 with a half-bridge structure, a DC capacitor C, a sub-module control board 501 and a drive board 502. The upper-bridge-arm switching device 3011 of the power circuit 301 includes an IGBT switching tube Q1, and the lower-bridge-arm switching device 3012 includes an IGBT switching tube Q2. The power module test system further includes an upper control device 107, an energy replenishment device 105, an adjustable load 103, an electromagnetic compatibility test device 701 and a temperature chamber.

[0159] Among them, the upper control device 107 has the following functions: 1. Functions such as monitoring the bypass switch state, Q1 / Q2 tube state, capacitor voltage state, etc., mainly to check whether there are situations such as switch misoperation, fault false alarm, state monitoring data and communication interference in the test environment (high temperature and / or electromagnetic interference); 2. The ability to control the conduction and cut-off of Q1 / Q2 tubes, and the time interval (i.e., the heat balance time) and pulse width of two double-pulse signals can be adjusted in real time according to needs; 3. The ability to communicate with external test instruments.

[0160] The adjustable load 103 has the following characteristics: its value is adjustable, mainly a high-power inductor, and it can be flexibly installed in the required commutation circuit. The replenishment power supply is an adjustable DC power supply, which can provide power support for the entire test system.

[0161] In an actual test scenario, through the external communication function of the upper control device 107, communication can be carried out with the electromagnetic compatibility test device 701 to synchronize the electromagnetic interference signal and the double-pulse sending signal periodically, that is, while the electromagnetic compatibility test device 701 emits an electromagnetic interference signal, the upper control device 107 sends a periodic double-pulse signal to the power module 101 to be tested to make it switch, so as to achieve the coupling of external electromagnetic interference and internal switch switching, and verify the operation stability of the power module 101 to be tested in a harsh environment.

[0162] Using the test system of this embodiment, according to the difference between the ambient temperature and the device temperature limit value, the high-temperature long-term operation or aging test of the power module 101 to be tested under the simulated load-carrying and current-carrying conditions can be completed without thermal runaway of the device. Further, the device characteristics at different time nodes under continuous high temperature can also be obtained through the oscilloscope 601.

[0163] For the switching control of switching transistors Q1 and Q2, it specifically includes:

[0164] State 1: The adjustable load 103 is connected between the first end and the second end of the switching transistor Q1. The control device controls the switching transistor Q1 to maintain a normally off state. At the same time, the upper control device 107 sends a double-pulse signal (i.e., on, off, on, off signals) to the switching transistor Q2 every time interval Δt (heat balance time). State 2: The adjustable load 103 is connected between the first end and the second end of the switching transistor Q2. The control device controls the switching transistor Q2 to maintain a normally off state. At the same time, the upper control device 107 sends a double-pulse signal (i.e., on, off, on, off signals) to the switching transistor Q1 every time interval Δt (heat balance time). Through the above two test states, the operating conditions of the power module 101 to be measured can be covered.

[0165] Due to the limitations of the system itself, the interval between two double-pulse signals is limited by the following two factors: One is limited by the required junction temperature of the device, that is, the heat generated by the switching losses of the bridge arm, etc., should reach the system thermal balance with the heat of natural heat dissipation without heat accumulation. The other is limited by the minimum double-pulse time interval when the freewheeling current of the diode (the diode connected in anti-parallel to each power switching device in the bridge arm switching device) drops to 0.

[0166] Therefore, the upper control device 107 subtracts the real-time collected ambient temperature from the temperature limit of the bridge arm switch to obtain the temperature difference value. Then, based on the loss formula of the bridge arm switch loss (including conduction loss and turn-off loss) and the thermal resistance of the bridge arm switch, an optimization analysis is carried out with the temperature difference value as the constraint condition, and finally the first time interval Δt1 is determined. Since the adjustable load 103 includes an inductor, the freewheeling circuit of the diode can be approximately regarded as a first-order zero-input response circuit composed of the adjustable load 103 and the stray resistance of the circuit. At this time, the time constant of the freewheeling circuit of the diode Combined with the empirical formula for the freewheeling current of the freewheeling circuit of the diode to drop to 0 Carry out analysis and calculation to determine the second time interval Δt2. Finally, when the first time interval is greater than or equal to the second time interval, combine Carry out calculations, and use the calculated Δtmin as the heat balance time Δt. When the first time interval is less than the second time interval, combine Carry out calculations, and use the calculated Δtmin as the heat balance time Δt.

[0167] It should be understood that although the steps in the flowcharts involved in the above-described embodiments are sequentially shown in the direction of the arrows, these steps are not necessarily executed sequentially in the order indicated by the arrows. Unless there is a clear indication in this article, the execution of these steps has no strict order limit, and these steps can be executed in other orders. Moreover, at least a part of the steps in the flowcharts involved in the above-described embodiments may include multiple steps or multiple stages. These steps or stages are not necessarily executed at the same time, but can be executed at different times. The execution order of these steps or stages is not necessarily sequential, but can be executed alternately or in turn with at least a part of the steps or stages in other steps or other steps.

[0168] Based on the same inventive concept, an embodiment of the present application also provides a power module test device for implementing the power module test method involved above. The solution provided by this device to solve the problem is similar to the solution described in the above method. Therefore, the specific limitations in one or more embodiments of the power module test device provided below can refer to the limitations on the power module test method in the above text, and will not be repeated here.

[0169] In some embodiments, please refer to Figure 13 , the present application also provides a power module test device, including: a switch control module 132 and a test analysis module 134.

[0170] The switch control module 132 is used to send a double-pulse signal to the power module to be tested at a heat balance time interval when the test preparation is completed; the test analysis module 134 is used to determine the test result according to the operating state parameters fed back by the power module to be tested.

[0171] In some embodiments, the switch control module 132 is further used to control the upper bridge arm switching device to turn off when the first end and the second end of the adjustable load are respectively connected to the first end and the second end of the upper bridge arm switching device, and send a double-pulse signal to the lower bridge arm switching device at a heat balance time interval. When the first end and the second end of the adjustable load are respectively connected to the first end and the second end of the lower bridge arm switching device, control the lower bridge arm switching device to turn off, and send a double-pulse signal to the upper bridge arm switching device at a heat balance time interval.

[0172] Please refer to Figure 14 , in some embodiments, before the switch control module 132, the device further includes a preparation module 142. The preparation module 142 is used to control the temperature chamber connected to the upper control device to operate at the test temperature.

[0173] In some embodiments, the preparation module 142 is further configured to control an electromagnetic compatibility test device communicatively connected to the upper control device to start running for testing the electromagnetic interference intensity.

[0174] In some embodiments, the test analysis module 134 is further configured to determine that the power module under test passes the test if the operation status parameters fed back by the power module under test do not have any errors within the test time range; and determine that the power module under test fails the test if the operation status parameters fed back by the power module under test have errors within the test time range.

[0175] Each module in the above power module test device can be implemented in whole or in part by software, hardware, and their combination. Each of the above modules can be embedded in the processor of the computer device in hardware form or be independent of it, or be stored in the memory of the computer device in software form so that the processor can call and execute the operations corresponding to each of the above modules.

[0176] In the above power module test device, the upper control device sends a double-pulse signal at a heat balance time interval to simulate the operation of the power module under test, and controls the on / off state of the switch without heat accumulation, thereby verifying the actual operation of the power module under test and meeting the actual operation requirements of the power module.

[0177] In one embodiment, a computer device is provided. The computer device can be a terminal, and its internal structure diagram can be as Figure 15 shown. The computer device includes a processor, a memory, a communication interface, a display screen, and an input device connected through a system bus. Among them, the processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The communication interface of the computer device is used to communicate with an external terminal in a wired or wireless manner. The wireless manner can be implemented through WIFI, a mobile cellular network, NFC (Near Field Communication), or other technologies. When the computer program is executed by the processor, it implements a power module test method. The display screen of the computer device can be a liquid crystal display screen or an electronic ink display screen. The input device of the computer device can be a touch layer covering the display screen, or a button, a trackball, or a touchpad provided on the housing of the computer device, or an external keyboard, touchpad, or mouse, etc.

[0178] Those skilled in the art can understand that Figure 15The structure shown is only a block diagram of some structures related to the solution of this application, and does not constitute a limitation on the computer device to which the solution of this application is applied. A specific computer device may include more or fewer components than those shown in the figure, or combine some components, or have a different component layout.

[0179] In one embodiment, a computer device is provided, including a memory and a processor. A computer program is stored in the memory, and when the processor executes the computer program, the following steps are implemented:

[0180] When the test preparation is completed, send a double-pulse signal to the leg switch device of the power module under test at a heat balance time interval; determine the test result according to the operating state parameters fed back by the power module under test.

[0181] In one embodiment, a computer-readable storage medium is provided, on which a computer program is stored. When the computer program is executed by a processor, the following steps are implemented:

[0182] When the test preparation is completed, send a double-pulse signal to the leg switch device of the power module under test at a heat balance time interval; determine the test result according to the operating state parameters fed back by the power module under test.

[0183] In one embodiment, a computer program product is provided, including a computer program. When the computer program is executed by a processor, the following steps are implemented:

[0184] When the test preparation is completed, send a double-pulse signal to the leg switch device of the power module under test at a heat balance time interval; determine the test result according to the operating state parameters fed back by the power module under test.

[0185] Those of ordinary skill in the art can understand that all or part of the processes in the methods of the above embodiments can be completed by instructing relevant hardware through a computer program. The computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above methods. Among them, any reference to a memory, database, or other medium used in the embodiments provided in the present application can include at least one of non-volatile and volatile memories. Non-volatile memories can include read-only memory (ROM), magnetic tapes, floppy disks, flash memories, optical memories, high-density embedded non-volatile memories, resistive random access memories (ReRAM), magnetoresistive random access memories (MRAM), ferroelectric random access memories (FRAM), phase change memories (PCM), graphene memories, etc. Volatile memories can include random access memory (RAM) or external cache memories, etc. By way of illustration and not limitation, RAM can be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM), etc. The databases involved in the embodiments provided in the present application can include at least one of relational databases and non-relational databases. Non-relational databases can include distributed databases based on blockchain, etc., without limitation. The processors involved in the embodiments provided in the present application can be general-purpose processors, central processing units, graphics processing units, digital signal processors, programmable logic devices, data processing logics based on quantum computing, etc., without limitation.

[0186] For the above computer device, storage medium, and computer program product, the upper control device sends double-pulse signals at a heat balance time interval to simulate the operation of the power module to be tested, and controls the on-off state of the switch without heat accumulation, so as to verify the actual operation of the power module to be tested and meet the actual operation requirements of the power module.

[0187] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than limiting them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be covered within the scope of the claims and the description of the present application. In particular, as long as there is no structural conflict, the technical features mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed in the text, but includes all technical solutions falling within the scope of the claims.

Claims

1. A power module test system, characterized in that, Comprising: Power module to be tested; Adjustable load, with both ends of the adjustable load respectively connected to the first port of the power module to be tested; Energy replenishment device, with both ends of the energy replenishment device respectively connected to the second port of the power module to be tested; Upper control device, connected to the control end of the power module to be tested, for sending double-pulse signals to the power module to be tested at a heat balance time interval when the test preparation is completed, and determining the test result according to the operating state parameters fed back by the power module to be tested; wherein, the heat balance time represents the time interval between two double-pulse signals required for the power module to be tested to operate without heat accumulation.

2. The power module testing system according to claim 1, characterized in that, The power module test system includes at least one of the following items: First item: The power module test system further includes a temperature detector communicatively connected to the upper control device, and the temperature detector is disposed on the power module to be tested; Second item: The power module test system further includes an oscilloscope, and the oscilloscope is connected to the power module to be tested; Third item: The power module test system further includes a temperature chamber connected to the upper control device, and the power module to be tested is disposed inside the temperature chamber; Fourth item: The power module test system further includes an electromagnetic compatibility test device communicatively connected to the upper control device.

3. A power module testing method, characterized in that, Comprising: When the test preparation is completed, sending double-pulse signals to the bridge arm switching device of the power module to be tested at a heat balance time interval; wherein, the heat balance time represents the time interval between two double-pulse signals required for the power module to be tested to operate without heat accumulation; Determining the test result according to the operating state parameters fed back by the power module to be tested.

4. The power module testing method according to claim 3, characterized in that The sending of double-pulse signals to the bridge arm switching device of the power module to be tested at a heat balance time interval includes: When the first end and the second end of the adjustable load are respectively connected to the first end and the second end of the upper bridge arm switching device of the power module to be tested, controlling the upper bridge arm switching device to turn off, and sending double-pulse signals to the lower bridge arm switching device of the power module to be tested at a heat balance time interval; When the first end and the second end of the adjustable load are respectively connected to the first end and the second end of the lower bridge arm switching device, controlling the lower bridge arm switching device to turn off, and sending double-pulse signals to the upper bridge arm switching device at a heat balance time interval.

5. The power module testing method according to claim 3 or 4, characterized in that, Before sending double-pulse signals to the power module to be tested at a heat balance time interval when the test preparation is completed, further comprising: Controlling the temperature chamber connected to the upper control device to operate at the test temperature; and / or, controlling the electromagnetic compatibility test device communicatively connected to the upper control device to start operating at the test electromagnetic interference intensity.

6. The power module testing method according to any one of claims 3-5, characterized in that The determination method of the heat balance time includes: Determining a first time interval according to the test environment temperature, the bridge arm switch temperature limit, the bridge arm switch loss, and the bridge arm switch thermal resistance; Determining a second time interval when the freewheeling current drops to zero according to the loop stray resistance and the inductance value of the adjustable load; Determining the heat balance time according to the first time interval and the second time interval.

7. The power module testing method according to claim 6, wherein Determining a first time interval according to the test environment temperature, the temperature limit of the leg switch, the loss of the leg switch, and the thermal resistance of the leg switch includes: Determining a temperature difference value according to the test environment temperature and the temperature limit of the leg switch; Based on the loss of the leg switch and the thermal resistance of the leg switch, performing optimization analysis with the temperature difference value as a constraint to determine the first time interval.

8. The power module testing method according to claim 6 or 7, characterized in that, Determining a second time interval when the freewheeling current drops to zero according to the loop stray resistance and the inductance value of the adjustable load includes: Determining the second time interval when the freewheeling current drops to zero according to the loop stray resistance, the inductance value of the adjustable load, and a preset time constant model.

9. The power module testing method according to any one of claims 6-8, characterized in that Determining the heat balance time according to the first time interval and the second time interval includes: In the case where the first time interval is greater than or equal to the second time interval, analyzing and determining the heat balance time according to the first time interval; In the case where the first time interval is less than the second time interval, analyzing and determining the heat balance time according to the second time interval.

10. A power module testing device, characterized in that, Including: A switch control module, configured to send a double-pulse signal to the leg switch device of the power module under test at a heat balance time interval when the test preparation is completed; wherein, the heat balance time represents the double-pulse signal interval time required for the power module under test to operate without heat accumulation; A test analysis module, configured to determine a test result according to the operation state parameters fed back by the power module under test.

11. A computer device, comprising a memory and a processor, the memory storing a computer program, characterized in that, When the processor executes the computer program, the steps of the power module test method according to any one of claims 3-9 are implemented.

12. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by a processor, the steps of the power module test method according to any one of claims 3-9 are implemented.

13. A computer program product, comprising a computer program, characterized in that, When the computer program is executed by a processor, the steps of the power module test method according to any one of claims 3-9 are implemented.

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