A power electronic device variable operating condition power cycle test system and control method

Abstract

The present invention discloses a variable operating condition power cycle test system and control method for power electronic devices. The system includes: a first DC source for adjusting the main circuit power current; a test branch including a first controllable switch, a device under test, and a second DC source, wherein the second DC source and the device under test are connected in parallel and are connected to one end of the first controllable switch, and the other end of the first controllable switch is connected to the first DC source; a cut-out branch including a second controllable switch and an impedance matching device connected in series, wherein the cut-out branch is connected in parallel with the test branch; a branch switching controller connected to the first controllable switch and the second controllable switch, respectively, and used to adjust the on / off state of the test branch and the cut-out branch; and a data processing terminal connected to the first DC source and the branch switching controller, respectively. The system effectively realizes that the power cycle conditions applied to the device under test can be automatically changed as needed, supporting fatigue mechanism, life, and other tests on the device under variable operating conditions.

Description

Technical Field

[0001] The present invention relates to the technical field related to power electronic device testing, and in particular to a power electronic device variable operating condition power cycle testing system and a control method. Background Art

[0002] As the core components of electric energy conversion devices, power electronic devices are widely used in fields such as renewable energy power generation, aerospace, electric vehicles, and rail transportation. However, with the increasing demands for device voltage levels and power density, as well as the influence of changes in working environment and mission profile, power electronic devices face severe fatigue failure risks. Therefore, the rational design and implementation of power cycling tests are important means to study the failure mechanism and lifespan of devices. In power cycling tests, by setting the magnitude of the power current flowing through the device under test and the on-off cycle, the device's heating temperature amplitude, mean value, and cycle are controlled, causing the device under test to gradually fatigue until it fails. Summary of the Invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention provides a variable operating condition power cycle test system for power electronic devices, which can perform fatigue mechanism and life tests on devices under variable operating conditions.

[0004] The present invention also provides a control method applied to the above-mentioned variable operating condition power cycle test system for power electronic devices.

[0005] A power electronic device variable operating condition power cycle testing system according to an embodiment of the first aspect of the present invention includes:

[0006] A first DC source is used to adjust the power current of the main circuit;

[0007] a test branch comprising a first controllable switch, a device under test, and a second DC source, wherein the second DC source and the device under test are connected in parallel and connected to one end of the first controllable switch, and the other end of the first controllable switch is connected to the first DC source;

[0008] A cut-out branch comprises a second controllable switch and an impedance matching device connected in series, wherein the cut-out branch is connected in parallel with the test branch;

[0009] a branch switching controller, connected to the first controllable switch and the second controllable switch, respectively, and configured to adjust the on / off states of the test branch and the cut-out branch;

[0010] The data processing terminal is connected to the first DC source and the branch switching controller respectively.

[0011] The variable operating condition power cycle test system for power electronic devices according to the embodiment of the present invention has at least the following beneficial effects:

[0012] The power cycling test system in an embodiment of the present invention can automatically change the power cycling conditions applied to the device under test as needed, thereby supporting fatigue mechanism and life testing of the device under variable operating conditions. Under the control of a data processing terminal, the first DC source can change the power current, enabling testing of different power currents and simulating a variety of actual operating conditions. Both the first controllable switch on the test branch and the second controllable switch on the cut-out branch can be controlled by a branch switching controller to adjust the on / off state. The branch switching controller is controlled by the data processing terminal to automatically switch each branch on and off with variable cycles. The device under test on the test branch is loaded with a turn-on voltage provided by the second DC source, keeping the device under test in a normally on state. A constant low test current is also constantly applied to the device, enabling junction temperature measurement using the low current injection method. An impedance matching device on the cut-out branch ensures that the impedance of the cut-out branch when the power current passes through it is consistent with the impedance of the test branch when the power current passes through it, ensuring that the first DC source remains stable during branch switching.

[0013] According to some embodiments of the present invention, the test branch further includes a diode, an anode of the diode is connected to the second DC source, and a cathode of the diode is connected to the one end of the first controllable switch.

[0014] According to some embodiments of the present invention, there are multiple test branches, and the multiple test branches are connected in parallel.

[0015] According to some embodiments of the present invention, each of the test branches includes a plurality of the devices under test.

[0016] The control method according to the second embodiment of the present invention comprises the following steps:

[0017] Acquire multiple sets of different power cycle operating condition parameters, each set of the power cycle operating condition parameters including at least power current, power voltage, operating time of the test branch, and number of operating condition cycles;

[0018] Selecting a set of target power cycle operating condition parameters from the multiple sets of power cycle operating condition parameters, and controlling the first DC source and the branch switching controller to perform a power cycle test according to the target power cycle operating condition parameters, wherein the first DC source is used to adjust the power current, and the branch switching controller is used to adjust the on / off states of the test branch and the cut-out branch;

[0019] Receive and record test data and test parameters, the test data including first voltage data, second voltage data and current data, and the test parameters including current working condition sequence number, current working condition cycle number and total working condition cycle number.

[0020] Since the control method adopts all the technical solutions of the variable operating condition power cycle test system for power electronic devices in the above embodiment, it has at least all the beneficial effects brought by the technical solutions of the above embodiment.

[0021] According to some embodiments of the present invention, the control method further comprises the following steps:

[0022] The test data and the test parameters are displayed.

[0023] According to some embodiments of the present invention, the control method further comprises the following steps:

[0024] When the current operating condition cycle number is consistent with the operating condition cycle number, the next set of target power cycle operating condition parameters is selected from multiple sets of power cycle operating condition parameters, so that the first DC source and the branch switching controller perform the power cycle test according to the next set of target power cycle operating condition parameters.

[0025] According to some embodiments of the present invention, selecting a next set of target power cycle operating condition parameters from the multiple sets of power cycle operating condition parameters comprises the following steps:

[0026] Obtaining the current working condition sequence number;

[0027] The next set of target power cycle operating condition parameters is obtained by selecting from the multiple sets of power cycle operating condition parameters according to the current operating condition sequence number.

[0028] According to some embodiments of the present invention, selecting a next set of target power cycle operating condition parameters from the multiple sets of power cycle operating condition parameters comprises the following steps:

[0029] The next set of target power cycle operating condition parameters is obtained by randomly acquiring the parameters from the multiple sets of power cycle operating condition parameters.

[0030] According to some embodiments of the present invention, the number of operating condition cycles in the next set of target power cycle operating condition parameters is obtained by the following steps:

[0031] Randomly obtain the number of cycles of the working condition;

[0032] The randomly acquired operating condition cycle number is recorded as the operating condition cycle number in the next set of target power cycle operating condition parameters.

[0033] Other features and advantages of the present invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the following description of the embodiments with reference to the accompanying drawings, in which:

[0035] Figure 1 This is a schematic diagram of the circuit principle of a power electronic device variable operating condition power cycle test system according to an embodiment of the present invention;

[0036] Figure 2 This is a schematic diagram of data collection of a device under test according to an embodiment of the present invention;

[0037] Figure 3 is a flow chart of power cycle data collection and information extraction according to an embodiment of the present invention;

[0038] Figure 4 This is a flow chart of cycle number accumulation and operating mode switching according to an embodiment of the present invention.

[0039] Reference numerals:

[0040] The first DC source 100,

[0041] A first controllable switch 210, a device under test 220, a second DC source 230,

[0042] The second controllable switch 310, the impedance matching device 320,

[0043] Branch switching controller 400,

[0044] Data processing terminal 500. DETAILED DESCRIPTION

[0045] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.

[0046] In the description of the present invention, if there is a description of first, second, etc., it is only for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0047] In the description of the present invention, it should be understood that descriptions involving orientation, such as the orientation or positional relationship indicated by up, down, etc., are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0048] In the description of the present invention, it should be noted that, unless otherwise clearly defined, terms such as setting, installing, and connecting should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0049] Reference Figure 1 As shown, Figure 1 The following is a schematic diagram of the circuit principle of a power electronic device variable operating condition power cycle test system according to an embodiment of the present invention. The power electronic device variable operating condition power cycle test system comprises:

[0050] A first DC source 100 is used to adjust the power current of the main circuit;

[0051] The test branch includes a first controllable switch 210, a device under test 220, and a second DC source 230. The second DC source 230 and the device under test 220 are connected in parallel and connected to one end of the first controllable switch 210. The other end of the first controllable switch 210 is connected to the first DC source 100.

[0052] A cut-out branch includes a second controllable switch 310 and an impedance matching device 320 connected in series, and the cut-out branch is connected in parallel with the test branch;

[0053] The branch switching controller 400 is connected to the first controllable switch 210 and the second controllable switch 310 respectively. The branch switching controller 400 is used to adjust the on / off state of the test branch and the cut-out branch;

[0054] The data processing terminal 500 is connected to the first DC source 100 and the branch switching controller 400 respectively.

[0055] refer to Figure 1 , Figure 1Taking two test branches as an example, the test branch and the cut-out branch are both connected in parallel at both ends of the first DC source 100, which is a programmable power DC source. Each test branch and the cut-out branch is connected in series with a controllable switch, which receives a switch control signal output by a branch switching controller 400, and the branch switching controller 400 receives a branch on-off cycle adjustment instruction from a data processing terminal 500. The data processing terminal 500 also sends a power current adjustment instruction to the first DC source 100. Each test branch is connected in series with a device under test 220, and a second DC source 230 is connected at both ends of the device under test 220. The second DC source 230 provides a conduction voltage and a constant small test current for the device under test 220. The entire power cycling test system is started by the data processing terminal 500 and exits the power cycling test when the cycle test is completed or the device under test 220 fails.

[0056] It should be noted that, as required, at least one test branch may be provided, and the test branch can work in conjunction with the cut-out branch to complete the power cycle test.

[0057] The power cycle test system in the embodiment of the present invention can realize that the power cycle conditions applied to the device under test 220 can be automatically changed as needed, thereby supporting fatigue mechanism, life and other tests on the device under variable working conditions. The first DC source 100 can change the size of the power current under the control of the data processing terminal 500, realize testing of different power current sizes, and realize simulation of various actual working conditions. The first controllable switch 210 on the test branch and the second controllable switch 310 on the cut-out branch can both be controlled by the branch switching controller 400 to adjust the on-off state. The branch switching controller 400 is controlled by the data processing terminal 500 to realize the control of each branch to realize variable cycle automatic on-off. The device under test 220 on the test branch is loaded with the on-voltage provided by the second DC source 230, so that the device under test 220 is in a normally on state; the device under test 220 is also often loaded with a constant small test current, which can be used to implement junction temperature measurement using the small current injection method. The impedance matching device 320 on the cut-out branch can keep the impedance of the cut-out branch when the power current passes through it consistent with the impedance of the test branch when the power current passes through it, so that the first DC source 100 remains stable during branch switching.

[0058] In some embodiments, reference Figure 1 As shown, the test branch further includes a diode, the anode of the diode is connected to the second DC source 230, and the cathode of the diode is connected to one end of the first controllable switch 210. The diode prevents power current from flowing back to the second DC source 230 in unexpected situations.

[0059] In some embodiments, reference Figure 1As shown, there are multiple test branches, and multiple test branches are connected in parallel. Multiple test branches can be set to work simultaneously for testing, obtaining multiple sets of test data to ensure accurate test results. In addition, the cooling time of one branch is used to test the device under test 220 of other branches, effectively improving test efficiency. Multiple test branches can also increase the freedom of branch switching. By setting different opening times for different test branches, different test branches can be operated in different operating conditions under the same set of operating parameters. However, this embodiment does not limit the specific number of test branches. Under the premise of ensuring the test results, a reasonable setting can be sufficient.

[0060] In some embodiments, reference Figure 1 As shown, each test branch includes multiple devices under test 220. The devices under test 220 are IGBT modules. When a test branch includes multiple devices under test 220, the devices under test 220 are connected in series. Increasing the number of devices under test 220 can effectively improve test efficiency. The gate of each IGBT module is loaded with a conduction voltage, keeping the IGBT module in a normally-on state. Furthermore, both the first controllable switch 210 and the second controllable switch 310 are IGBT modules with a rated current significantly higher than the power current.

[0061] This embodiment also proposes a control method, referring to Figure 2 、 Figure 3 As shown, the following steps are included:

[0062] Acquire multiple sets of different power cycle operating condition parameters, each set of power cycle operating condition parameters including at least power current, power voltage, operating time of the test branch, and number of operating condition cycles;

[0063] A set of target power cycle operating condition parameters is selected from multiple sets of power cycle operating condition parameters, and the first DC source 100 and the branch switching controller 400 are controlled to perform a power cycle test according to the target power cycle operating condition parameters. The first DC source 100 is used to adjust the power current, and the branch switching controller 400 is used to adjust the on / off state of the test branch and the cut-off branch;

[0064] Receive and record test data and test parameters, the test data including first voltage data, second voltage data and current data, and the test parameters including current working condition sequence number, current working condition cycle number and total working condition cycle number.

[0065] First, multiple groups of different power cycle operating condition parameters are obtained, and the number of parameter groups can be increased or decreased as needed. Each group of parameters includes at least the power current size, the power voltage upper limit, the working time of the test branch, and the number of operating condition cycles, which are used to simulate the actual working condition. Setting multiple groups of parameters can play a role in being closer to the actual working condition. Start the power cycle test, that is, select a group of target power cycle operating condition parameters as operating condition 1 from multiple groups of power cycle operating condition parameters. According to the target power cycle operating condition parameters, the first DC source 100 adjusts the power current to the required size set in operating condition 1; according to the target power cycle operating condition parameters, the branch switching controller 400 controls the controllable switches in series on each test branch and the cut-out branch, so that each branch is cycled on and off according to the branch on-off cycle set in operating condition 1. In addition, because the power current continuously switches between the branches, when the first test branch is in the open state, the device under test 220 of the first test branch is in the heating state, and the cooling state of the device under test 220 of the first test branch is the opening moment of the second test branch or other test branches or the cut-out branch, then the cooling time of the device under test 220 of the first test branch is the sum of the opening times of all other branches. In this way, cyclic cooling and heating of the device under test 220 is achieved. At the same time, during the test cycle, test data and test parameters will be received and recorded. The test data includes first voltage data, second voltage data and current data. The test parameters include the current working condition sequence number, the number of current working condition cycles, and the total number of working condition cycles. Specifically, refer to Figure 2 、 Figure 3 As shown, a short period of saturation voltage drop of the device under test 220 before the rising edge of the test branch is turned on is the first voltage data. The first voltage data is subsequently used to calculate the minimum junction temperature of the device under test 220 before a power cycle heating. A short period of saturation voltage drop of the device under test 220 before the falling edge of the test branch is turned off is the second voltage data. The second voltage data is combined with the power current to subsequently calculate the heating power of the device under test 220 and, in turn, the module junction-to-case thermal resistance. The second voltage data is subsequently used to calculate the maximum junction temperature of the device under test 220 after a power cycle heating.

[0066] By utilizing the aforementioned variable-operating-condition power cycling test system for electronic power devices, the control method in the embodiments of the present invention enables the power cycling conditions applied to the device under test 220 to be automatically changed as needed, thereby supporting fatigue mechanism and life testing of the device under variable operating conditions. Under the control of the data processing terminal 500, the first DC source 100 can vary the power current, enabling testing of different power and current levels and simulating a variety of actual operating conditions. Both the first controllable switch 210 on the test branch and the second controllable switch 310 on the cut-out branch can be controlled by the branch switching controller 400 to adjust the on / off state. The branch switching controller 400 is controlled by the data processing terminal 500 to automatically switch each branch on and off with variable cycles. The device under test 220 on the test branch is loaded with a conduction voltage provided by the second DC source 230, keeping it in a normally on state. A constant low test current is also constantly applied to the device under test 220, enabling junction temperature measurement using the low-current injection method. The impedance matching device 320 on the cut-out branch can keep the impedance of the cut-out branch when the power current passes through it consistent with the impedance of the test branch when the power current passes through it, so that the first DC source 100 remains stable during branch switching.

[0067] In some embodiments, the control method further comprises the following steps:

[0068] Display test data and test parameters. During the cycle test, all relevant data of each cycle test will be recorded, updated and displayed in real time. All test data will be saved as a test record file to facilitate observation of the variable working condition power cycle test process and test data analysis.

[0069] In some embodiments, reference Figure 4 As shown, the control method further includes the following steps:

[0070] When the current operating condition cycle number is consistent with the operating condition cycle number, the next set of target power cycle operating condition parameters is selected from the multiple sets of power cycle operating condition parameters, so that the first DC source 100 and the branch switching controller 400 perform the power cycle test according to the next set of target power cycle operating condition parameters. Figure 4 When the number of operating condition cycles set in a set of target power cycle operating condition parameters has been completed, the data processing terminal 500 will select the next set of target power cycle parameters from the set multiple sets of power cycle operating condition parameters to continue the cycle until all operating condition parameters are cycled and tested, or the device under test 220 fails, and then exit the power cycle.

[0071] In some embodiments, reference Figure 4 As shown, the next set of target power cycle operating condition parameters is selected from multiple sets of power cycle operating condition parameters and obtained by the following steps:

[0072] Get the current working condition serial number;

[0073] The next set of target power cycle operating condition parameters is obtained by selecting from multiple sets of power cycle operating condition parameters according to the current operating condition sequence number.

[0074] There are many ways to obtain the next set of target power cycle operating condition parameters. One of them is to obtain the current operating condition sequence number, and update and record the current operating condition sequence number being executed, the number of times the current operating condition has been cycled, and the total number of cycles through the current operating condition execution record file; when executing each power cycle, the number of times the current operating condition has been cycled and the total number of cycles are increased by 1; when the number of times the current operating condition has been cycled exceeds the predicted number of times for this operating condition, the number of times the current operating condition has been cycled is set to 1, and the current operating condition sequence number is increased by 1 at the same time; when the current operating condition sequence number exceeds the preset maximum operating condition sequence number, the current operating condition sequence number is set to 1, that is, the cycle is restarted from operating condition 1; when the total number of cycles exceeds the predicted total number or a failure of the device under test 220 is detected, the power cycle is exited.

[0075] In some embodiments, reference Figure 3 As shown, the next set of target power cycle operating condition parameters is selected from multiple sets of power cycle operating condition parameters and obtained by the following steps:

[0076] The next set of target power cycle operating condition parameters is obtained by randomly acquiring the parameters from multiple sets of power cycle operating condition parameters.

[0077] The above-mentioned conditions are switched sequentially according to the condition sequence and the preset number of cycles. However, when switching between conditions, it is also possible to randomly switch to any condition sequence and set the number of cycles of the next condition to a random value. This allows for random switching of conditions and allows for a more random variable condition power cycling test. When only one condition is available, a conventional fixed condition power cycling test is performed.

[0078] In some embodiments, reference Figure 3 As shown, the number of operating cycle conditions in the next set of target power cycle operating condition parameters is obtained by the following steps:

[0079] Randomly obtain the number of working condition cycles;

[0080] The randomly obtained operating cycle number is recorded as the operating cycle number in the next set of target power cycle operating condition parameters.

[0081] The number of operating condition cycles can be obtained randomly or executed according to the number of cycles set in the obtained target power cycle operating condition parameters. Both methods can achieve the effect of simulating real operating conditions, but this embodiment does not limit this and a reasonable choice can be made.

[0082] Those skilled in the art will appreciate that all or some of the steps and systems in the method disclosed above can be implemented as software, firmware, hardware, and appropriate combinations thereof. Some physical components or all physical components can be implemented as software executed by a processor, such as a central processing unit, a digital signal processor, or a microprocessor, or implemented as hardware, or implemented as an integrated circuit, such as an application-specific integrated circuit. Such software can be distributed on a computer-readable medium, and the computer-readable medium can include computer storage media (or non-transitory media) and communication media (or temporary media). As known to those skilled in the art, the term computer storage media is included in any method or technology for storing information (such as computer-readable instructions, data structures, program modules, or other data) and is volatile and non-volatile, removable, and non-removable. Computer storage media includes, but is not limited to, RAM, ROM, EEPROM, flash memory, or other memory technology, CD-ROM, digital versatile disks (DVD), or other optical disk storage, magnetic cassettes, magnetic tapes, disk storage, or other magnetic storage devices, or any other medium that can be used to store desired information and can be accessed by a computer. Furthermore, as is well known to those skilled in the art, communication media typically embodies computer-readable instructions, data structures, program modules, or other data in a modulated data signal such as a carrier wave or other transport mechanism, and may include any information delivery media.

[0083] The embodiments of the present invention are described in detail above with reference to the accompanying drawings, but the present invention is not limited to the above embodiments. Various changes can be made within the scope of knowledge possessed by ordinary technicians in the relevant technical field without departing from the scope of the present invention.

Claims

1. A variable operating condition power cycle test system for power electronic devices, characterized in that: include: A first DC source is used to adjust the power current of the main circuit; a test branch comprising a first controllable switch, a device under test, and a second DC source, wherein the second DC source and the device under test are connected in parallel and connected to one end of the first controllable switch, and the other end of the first controllable switch is connected to the first DC source; There are multiple test branches, and the multiple test branches are connected in parallel; a cut-out branch, comprising a second controllable switch and an impedance matching device connected in series, the cut-out branch being connected in parallel with the test branch, the impedance matching device being configured to ensure that the impedance of the cut-out branch when the power current passes therethrough is consistent with the impedance of the test branch when the power current passes therethrough; a branch switching controller, connected to the first controllable switch and the second controllable switch, respectively, and configured to adjust the on / off states of the test branch and the cut-out branch; a data processing terminal connected to the first DC source and the branch switching controller respectively; The data processing terminal is used to send a power current adjustment instruction to the first DC source to control the first DC source, adjust the main circuit power current, and change the magnitude of the main circuit power current; The data processing terminal is further used to send a branch on-off cycle adjustment instruction to the branch switching controller to control the branch switching controller to adjust the on-off state of the test branch and the cut-out branch. Under the same set of operating parameters, different test branches are set with different opening times. When the first test branch is in the opening state, the device under test of the first test branch is in the heating state. The cooling state of the device under test of the first test branch is the opening moment of the second test branch or other test branches or the cut-out branch. The cooling time of the device under test of the first test branch is the sum of the opening times of all other branches.

2. The variable operating condition power cycle test system for power electronic devices according to claim 1, characterized in that: The test branch further includes a diode, an anode of the diode is connected to the second DC source, and a cathode of the diode is connected to the one end of the first controllable switch.

3. The variable operating condition power cycle test system for power electronic devices according to claim 1, characterized in that: Each of the test branches includes a plurality of the devices under test.

4. A control method for a power electronic device variable operating condition power cycle test system, characterized in that: The power electronic device variable operating condition power cycle test system according to claim 1 includes a first DC source, a test branch, a cut-out branch, a branch switching controller, and a data processing terminal; and the control method includes the following steps: Acquire multiple sets of different power cycle operating condition parameters, each set of the power cycle operating condition parameters including at least power current, power voltage, operating time of the test branch, and number of operating condition cycles; Selecting a set of target power cycle operating condition parameters from the multiple sets of power cycle operating condition parameters, and controlling the first DC source and the branch switching controller to perform a power cycle test according to the target power cycle operating condition parameters, wherein the first DC source is used to adjust the power current, and the branch switching controller is used to adjust the on / off states of the test branch and the cut-out branch; Receive and record test data and test parameters, the test data including first voltage data, second voltage data, and current data, and the test parameters including a current operating condition sequence number, a current operating condition cycle number, and a total number of operating condition cycles; When the current operating condition cycle number is consistent with the operating condition cycle number, selecting a next set of target power cycle operating condition parameters from the multiple sets of power cycle operating condition parameters, so that the first DC source and the branch switching controller perform the power cycle test according to the next set of target power cycle operating condition parameters; The step of selecting a next set of target power cycle operating condition parameters from the multiple sets of power cycle operating condition parameters comprises the following steps: Obtaining the current working condition sequence number; Selecting from the plurality of groups of power cycle operating condition parameters according to the current operating condition sequence number to obtain the next group of target power cycle operating condition parameters; Among them, when executing each power cycle, the number of cycles of the current working condition and the total number of cycles are increased by 1; when the number of cycles of the current working condition exceeds the number set for this working condition, the number of cycles of the current working condition is set to 1, and the current working condition sequence number is increased by 1; when the current working condition sequence number exceeds the preset maximum working condition sequence number, the current working condition sequence number is set to 1; when the total number of cycles exceeds the preset total number of cycles or a failure of the device under test is detected, the power cycle is exited.

5. The control method according to claim 4, characterized in that: The control method further comprises the following steps: The test data and the test parameters are displayed.

6. The control method according to claim 4, characterized in that: The selecting a next set of target power cycle operating condition parameters from the multiple sets of power cycle operating condition parameters comprises the following steps: The next set of target power cycle operating condition parameters is obtained by randomly acquiring the parameters from the multiple sets of power cycle operating condition parameters.

7. The control method according to claim 4, characterized in that: The number of operating cycle conditions in the next set of target power cycle operating condition parameters is obtained by the following steps: Randomly obtain the number of cycles of the working condition; The randomly acquired operating condition cycle number is recorded as the operating condition cycle number in the next set of target power cycle operating condition parameters.

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