Power module switch performance test system
Through the automated control system and the testing equipment are coordinated to control the test equipment, the problem of low switching performance testing efficiency in the existing technology is solved, and an efficient and accurate testing process is achieved.
Patent Information
- Application Number
- CN202311629149.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2023-11-30
- Publication Date
- 2025-05-30
AI Technical Summary
In the prior art, the power module switch performance testing efficiency is low, and testers need to perform a lot of manual operations and equipment adjustments, resulting in large workloads and inability to collect data.
It provides a power module switching performance testing system, which coordinates the high-voltage power supply, signal generator and loss feature collector through the controller to automatically control the test process, ensure that the loss feature collector is in the triggered state, and collects and stores loss feature parameters.
Automatic testing of the switching performance of power modules is realized, which reduces the workload of testers, improves the testing efficiency, and ensures timely data collection and accuracy.
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Figure CN120064956A_ABST
Abstract
Description
Technical Field
[0001] The present disclosure relates to the technical field of electronic devices, and particularly to a power module switching performance test system. Background Art
[0002] During the use of a power module, there are switching losses and turn-off losses in the internal switching control devices. Therefore, it is necessary to test the switching performance of the power module, and analyze and evaluate the functions and performance of the switching control devices of the power module by measuring parameters such as voltage and current.
[0003] Currently, a manual test method is used to detect the switching performance of the power module. The equipment required in the test process includes a low-voltage power supply, a high-voltage power supply, a signal generator, and an oscilloscope. Since, during the manual test process, both parameter adjustment and equipment operation need to be manually adjusted by the tester, and the oscilloscope data needs to be observed and saved in a timely manner after each manual adjustment, the workload of the tester is extremely large. Moreover, there is a situation where the signal generator has sent a pulse signal, but the oscilloscope has not been adjusted to the trigger state in a timely manner, resulting in the failure to collect data, and the test needs to be carried out again, greatly reducing the efficiency of the switching performance test. Summary of the Invention
[0004] To solve the above technical problems or at least partially solve the above technical problems, the present disclosure provides a power module switching performance test system.
[0005] In a first aspect, the present application provides a power module switching performance test system, and the method includes:
[0006] The high-voltage power supply is used to provide a driving voltage to the working end of the power module to be tested;
[0007] The signal generator is used to output a control pulse signal to the control end of the power module to be tested;
[0008] The loss characteristic collector is used to collect the loss characteristic parameters of the power module to be tested during the switching control process;
[0009] The controller is used to control the signal generator to generate a control pulse signal after determining that the loss characteristic collector is in a trigger state, and acquire and store the loss characteristic parameters collected by the loss characteristic collector.
[0010] Optionally, the controlling the signal generator to generate a control pulse signal includes:
[0011] The controller controls the signal generator to output a plurality of control pulse signals, where the pulse width durations of the plurality of control pulse signals increase or decrease in sequence according to a set gradient duration.
[0012] Optionally, determining that the loss characteristic collector is in a triggered state includes:
[0013] Sending a trigger preparation instruction to the loss characteristic collector, and after receiving a trigger status indication signal fed back by the loss characteristic collector, determining that the loss characteristic collector is in a triggered state.
[0014] Optionally, before sending the trigger preparation instruction to the loss characteristic collector, the controller is further configured to: send a range setting instruction to the loss characteristic collector so that it sets a parameter acquisition range according to the range setting instruction, and the range setting instruction is determined according to a target voltage and a target current output by the high-voltage power supply.
[0015] Optionally, before sending the trigger preparation instruction to the loss characteristic collector, the controller is further configured to: send a first parameter configuration instruction to the loss characteristic collector, and the configuration parameters in the first parameter configuration instruction include at least one of the following: input impedance of the acquisition channel, probe attenuation of the acquisition channel, trigger amplitude and acquisition mode, acquisition data amplitude, trigger position, and recorded data duration.
[0016] Optionally, before controlling the signal generator to generate a control pulse signal, the controller is further configured to:
[0017] Determine that the high-voltage power supply is in a setting preparation state, where the preset preparation state includes outputting the target voltage and outputting the target current when the working end of the power module under test is turned on.
[0018] Optionally, the controller determines that the high-voltage power supply is in a setting preparation state, including:
[0019] Sending a power supply setting instruction to the high-voltage power supply, and after receiving the setting feedback information fed back by the high-voltage power supply, determining that the high-voltage power supply is in a setting preparation state, where the voltage setting instruction includes the target voltage and the target current.
[0020] Optionally, before the controller controls the high-voltage power supply to be in a setting preparation state, the controller is further configured to:
[0021] Obtain the output voltage and output current of the high-voltage power supply during the previous test, and determine the target voltage and the target current according to the output voltage and the output current;
[0022] Wherein, when the output current is less than the threshold current, adding the test current and a preset gradient current to obtain the target current, and using the test voltage as the target voltage;
[0023] Alternatively, when the test current reaches the threshold current, the target voltage is obtained by adding the output voltage to a preset gradient voltage and increasing it according to a set voltage gradient, and the initial set current is used as the target current.
[0024] Optionally, the controller is further configured to power off the high-voltage power supply, the signal generator, and the loss characteristic collector when the test voltage of the previous test reaches the threshold voltage and the test current of the previous test reaches the threshold current.
[0025] Optionally, before the controller controls the signal generator to generate a control pulse signal, it is further configured to:
[0026] Send a second parameter configuration instruction to the signal generator, where the configuration parameters in the second parameter configuration instruction include at least one of the following: trigger mode, trigger interval time, number of pulse signals, duty cycle of pulse signals, base frequency of pulse signals, amplitude of pulse signals, pre-pulse time, and post-pulse time.
[0027] The technical solution provided by the embodiments of the present disclosure can realize the automatic test of the switching performance of the power module through the power module switching performance test system. During the test, the controller can control the signal generator to generate a control pulse signal after determining that the loss characteristic collector is in the trigger state, and obtain and store the loss characteristic parameters collected by the loss characteristic collector, ensuring that the loss characteristic collector can collect test data in a timely manner. In the embodiments of the present disclosure, the tester controls the test equipment through the controller to automatically adjust parameters and perform test operations, without the tester having to manually adjust throughout the process as in manual testing, reducing the test workload and improving the test efficiency. It reduces the workload of the tester, greatly shortens the test time, and improves the test efficiency of the switching performance of the power module. BRIEF DESCRIPTION OF THE DRAWINGS
[0028] The accompanying drawings herein are incorporated into the specification and constitute a part of the specification, showing embodiments consistent with the present disclosure and used together with the specification to explain the principles of the present disclosure.
[0029] To more clearly illustrate the technical solutions in the embodiments of the present disclosure or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, for those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.
[0030] Figure 1 Schematic diagram of a power module switching performance test system according to an embodiment of the present disclosure;
[0031] Figure 2Flow chart of a power module switching performance test system according to an embodiment of the present disclosure. Detailed implementation manners
[0032] In order to more clearly understand the above objects, features and advantages of the present disclosure, the solutions of the present disclosure will be further described below. It should be noted that, without conflict, the embodiments of the present disclosure and the features in the embodiments may be combined with each other.
[0033] In the following description, many specific details are set forth in order to fully understand the present disclosure, but the present disclosure may also be implemented in other ways different from those described herein; obviously, the embodiments in the specification are only a part of the embodiments of the present disclosure, rather than all the embodiments.
[0034] Currently, when detecting the switching performance of a power module, testers need to manually adjust test equipment such as a low-voltage power supply, a high-voltage power supply, a signal generator, and an oscilloscope to complete the test process. Since comprehensive data on the switching performance of the power module needs to be obtained, the voltage, current, and pulse width need to be adjusted successively to obtain the switching performance data of the power module under different conditions. Therefore, a large number of manual operations are required by the testers.
[0035] Therefore, when using the manual method for switching tests, the parameters of the equipment used in the test process are determined and configured by the testers. And during the detection process of simulating different parameter conditions such as voltage and current, a large number of voltage values, current values, and pulse width values need to be set for testing. Each change in voltage and pulse width requires manual adjustment, and after each manual adjustment, the oscilloscope data needs to be observed and saved in a timely manner, resulting in a huge workload for the testers. Moreover, there is a situation where the signal generator has sent a pulse signal, but the oscilloscope has not been adjusted to the trigger state in time, resulting in the failure to collect data, and the test needs to be carried out again, greatly reducing the efficiency of the switching performance test.
[0036] The embodiment of the present disclosure provides a power module switching performance test system, which can realize the automatic test of the switching performance of the power module. The controller cooperatively controls each device, replacing the traditional manual test process. During the test process, after determining that the loss feature collector is in the trigger state, the controller can control the signal generator to generate a control pulse signal, and acquire and store the loss feature parameters collected by the loss feature collector, ensuring that the loss feature collector can collect test data in a timely manner. In the embodiment of the present disclosure, the tester controls the test equipment to automatically adjust parameters and perform test operations through the controller, without the tester having to perform manual adjustment throughout the process as in the manual test, reducing the workload of the tester, greatly shortening the test time, and improving the test efficiency of the switching performance of the power module.
[0037] Figure 1 Schematic diagram of a power module switching performance test system according to an embodiment of the present disclosure. As Figure 1 shown, a power module switching performance test system provided by an embodiment of the present disclosure includes: a high-voltage power supply 101, a signal generator 102, a loss characteristic collector 103, and a controller 104.
[0038] The output end of the high-voltage power supply 101 is connected to the working input end of the power module 105 to be tested, and is used to provide a driving voltage to the working input end of the power module 105 to be tested.
[0039] The signal output end of the signal generator 102 is connected to the control end of the power module 105 to be tested, and is used to output a control pulse signal to the control end of the power module 105 to be tested.
[0040] The loss characteristic collector 103 is connected to the working end of the power module 105 to be tested, and is used to collect the loss characteristic parameters of the power module 105 to be tested during the switching control process.
[0041] The controller 104 is respectively connected to the high-voltage power supply 101, the signal generator 102, and the loss characteristic collector 103, and is used to control the signal generator 102 to generate a control pulse signal after determining that the loss characteristic collector 103 is in a trigger state, and to obtain and store the loss characteristic parameters collected by the loss characteristic collector 103.
[0042] The power module switching performance test system provided by the embodiment of the present disclosure can perform collaborative control on each device through the controller, replacing the traditional manual test process. During the test, the controller can control the signal generator to generate a control pulse signal after determining that the loss characteristic collector is in a trigger state, and obtain and store the loss characteristic parameters collected by the loss characteristic collector, ensuring that the loss characteristic collector can collect test data in a timely manner.
[0043] In order to enable the signal generator 102 to output a control pulse signal according to requirements, and the loss characteristic collector 103 to collect loss characteristic parameter data in a timely manner, in some embodiments of the present disclosure, after determining that the loss characteristic collector 103 is in a trigger state through the controller, the specific process of controlling the signal generator 102 to generate a control pulse signal, and obtaining and storing the loss characteristic parameters collected by the loss characteristic collector 103 includes:
[0044] In some embodiments of the present disclosure, in order to enable the loss characteristic collector to display test data more reasonably, before the controller 104 sends a trigger preparation instruction to the loss characteristic collector 103, it sends a range setting instruction to the loss characteristic collector 103 to set the parameter collection range according to the range setting instruction, and the range setting instruction is determined according to the target voltage and target current output by the high-voltage power supply 101.
[0045] In specific implementation, the controller 104 determines a range setting instruction according to the target voltage and target current output by the high-voltage power supply 101, so that the loss characteristic collector 103 can complete the complete collection of parameters when collecting data. After receiving the range setting instruction sent by the controller 104, the loss characteristic collector 103 sets the parameter collection range according to the range setting instruction. Therefore, it can be avoided that when manually collecting data, due to the failure to timely adjust the parameter range of the loss characteristic collector 103, the situation of data collection failure occurs, so that the loss characteristic collector can display the test data more reasonably, enabling the tester to obtain more complete data.
[0046] In other embodiments, it may also be that the loss characteristic collector 103 automatically determines the range according to the collected test data, and the loss characteristic collector 103 automatically adjusts the vertical coordinate range on its display screen according to the collected loss characteristic parameters, so that the test data can be displayed reasonably.
[0047] In some embodiments of the present disclosure, in order to make the parameter setting of the loss characteristic collector 103 more reasonable during the test, before sending a trigger preparation instruction to the loss characteristic collector 103, the controller 104 also sends a first parameter configuration instruction to the loss characteristic collector 103. The configuration parameters in the first parameter configuration instruction include at least one of the following: input impedance of the acquisition channel, probe attenuation of the acquisition channel, trigger amplitude and acquisition mode, acquisition data amplitude, trigger position, and recording data duration.
[0048] In specific implementation, after the controller 104 sends the first parameter configuration instruction to the loss characteristic collector 103, the loss characteristic collector 103 will perform corresponding parameter configuration. By configuring the parameters of the input impedance of the acquisition channel, probe attenuation of the acquisition channel, trigger amplitude and acquisition mode, acquisition data amplitude, trigger position, and recording data duration. By reasonably configuring the parameters, the parameter setting of the loss characteristic collector 103 during the switching performance test of the power module is made more reasonable, ensuring its adaptability to the test target.
[0049] As mentioned above, after the controller determines that the loss feature collector 103 is in the trigger state, the control signal generator 102 generates a control pulse signal, and acquires and stores the loss feature parameters collected by the loss feature collector 103. In some embodiments, the steps for the controller to determine whether the loss feature collector 103 is in the trigger state include: the controller 104 sends a trigger preparation instruction to the loss feature collector 103. After the loss feature collector 103 receives the trigger preparation instruction, the loss feature collector 103 will enter the trigger state and send a trigger state indication signal to the controller 104. After the controller 104 receives the trigger state indication signal fed back by the loss feature collector 103, it determines that the loss feature collector 103 is in the trigger state. The method provided in the above embodiments can not only control the loss feature collector 103 to enter the trigger state through the controller 104, but also needs to receive the feedback signal of the loss feature collector 103 to determine that the loss feature collector 103 has entered the trigger state. By using the method of receiving the feedback signal to further determine that the loss feature collector 103 has entered the trigger state, the reliability of the test process is improved.
[0050] In some other embodiments, after the controller 104 issues a control instruction, after waiting for a preset period of time, it is determined to enter the preparation state. Using this method, although the controller 104 has issued a control instruction, the loss feature collector 103 has not successfully entered the trigger state, resulting in the inability to successfully collect test data and reducing the reliability of the test process.
[0051] As analyzed above, in the embodiments of the present disclosure, through the trigger preparation instruction transmitted between the controller 104 and the loss feature collector 103, it is ensured that the loss feature collector 103 can enter the trigger state according to requirements, so that the loss feature parameter data can be received in a timely manner. And through the range setting instruction and the first parameter configuration instruction sent by the controller 104 to the loss feature collector 103, it is ensured that the parameters of the loss feature collector 103 are more reasonable during the test process and the test data can be reasonably displayed.
[0052] As described above, after the controller 104 determines that the loss feature collector 103 is already in the trigger state, the controller 104 sends a pulse signal output instruction to the signal generator 102 to control the signal generator 102 to output a plurality of control pulse signals, where the pulse width durations of the plurality of control pulse signals increase or decrease in sequence according to the set gradient duration.
[0053] Embodiments of the present disclosure can set the pulse width duration according to the test gradient requirements. Therefore, the controller 104 can be used to control the pulse width duration of the pulse signal to be adjusted sequentially according to the set gradient duration. The tester does not need to perform multiple parameter adjustments during the test, greatly reducing the workload of the tester, shortening the test time, and improving the test efficiency of the switching performance of the power module.
[0054] To solve the problem that each parameter adjustment and device operation need to be manually adjusted by the tester, resulting in a large workload and low test efficiency for the tester. Therefore, in the embodiments of the present disclosure, during the process of controlling the signal generator 102 to generate a control pulse signal and acquiring and storing the loss characteristics collected by the loss characteristic collector 103 after determining that the loss characteristic collector 103 is in the trigger state, the specific process of the controller 104 controlling the high-voltage power supply 101 to output and automatically adjust the voltage and current according to the test requirements includes:
[0055] In some embodiments of the present disclosure, in addition to controlling the loss characteristic collector 103 and the signal generator 102, the controller 104 can also control the high-voltage power supply 101. The specific process of controlling the high-voltage power supply 101 includes: before the controller 104 controls the signal generator 102 to generate a control pulse signal, the controller 104 also needs to determine whether the high-voltage power supply 101 is in the set ready state, and the set ready state includes outputting the target voltage and outputting the target current when the working end of the power module 105 to be tested is conducting.
[0056] In specific implementation, when accurately testing the switching performance of the power module 105 to be tested, it is necessary to test the switching performance of the power module to be tested under various different voltages and currents. The controller 104 can be used to control the high-voltage power supply 101 to automatically adjust the voltage and current. The specific adjustment process includes: acquiring the output voltage and output current of the high-voltage power supply 101 during the previous test, and determining the target voltage and target current according to the output voltage and output current; wherein, when the output current is less than the threshold current, adding the test current and the preset gradient current to obtain the target current, and using the test voltage as the target voltage; or, when the test current reaches the threshold current, adding the output voltage and the preset gradient voltage to obtain the target voltage, increasing the target voltage according to the set voltage gradient, and using the initial set current as the target current; and the controller 104 is further used to control the high-voltage power supply 101, the signal generator 102, and the loss characteristic collector 103 to be powered off when the test voltage of the previous test reaches the threshold voltage and the test current of the previous test reaches the threshold current.
[0057] In the above embodiments, the preset gradient can be a positive gradient or a negative gradient, which means that the controller 104 can control the voltage and current output by the high-voltage power supply 101 to increase or decrease according to a certain gradient.
[0058] In some embodiments, the controller 104 can also simulate random situations that occur during the actual vehicle driving process to control the magnitudes of the voltage and current output by the high-voltage power supply 101. During the actual vehicle driving process, there may be a possibility that the voltage and current passing through the power module suddenly increase or decrease significantly. Therefore, the controller 104 controls the high-voltage power supply 101 to output a significant increase or decrease in voltage and current to simulate the possible situations during the actual vehicle driving process.
[0059] During the process of the controller 104 controlling the high-voltage power supply 101, in order to ensure that the high-voltage power supply 101 enters the set ready state, in some embodiments of the present disclosure, the process of the controller 104 controlling the high-voltage power supply 101 to enter the set ready state includes: after the controller 104 sends a power supply setting instruction to the high-voltage power supply 101 and receives the set feedback information fed back by the high-voltage power supply 101, it is determined that the high-voltage power supply 101 is in the set ready state, where the voltage setting instruction includes a target voltage and a target current.
[0060] Through the foregoing analysis, before the controller 104 controls the control signal generator 102 to generate a control pulse signal, it is necessary to first control the target voltage and target current to be output by the high-voltage power supply 101, and then determine whether the high-voltage power supply 101 is in the set ready state. If it is determined that the high-voltage power supply 101 is in the set ready state, then control the high-voltage power supply 101 to output the corresponding voltage and current. In the embodiments of the present disclosure, a large number of parameters such as voltage and current can be configured in the test equipment at the same time, and the controller 104 can perform collaborative control on each device, replacing the traditional manual test process. Without manual adjustment, a large amount of test data can be accurately obtained, reducing the workload of the test personnel, greatly shortening the test time, and improving the test efficiency of the switching performance of the power module.
[0061] In the embodiments of the present disclosure, in order to make the signal configuration output by the signal generator 102 more reasonable during the test process, it is necessary for the controller 104 to send a second parameter configuration instruction to the signal generator 102 before controlling the signal generator 102 to generate a control pulse signal. The configuration parameters in the second parameter configuration instruction include at least one of the following: trigger mode, trigger interval time, number of pulse signals, pulse signal duty cycle, pulse signal base frequency, pulse signal amplitude, pre-pulse time, and post-pulse time.
[0062] As analyzed above, the controller 104 can control the high-voltage power supply 101 to output voltage and current, can also control the signal generator to output pulse signals, and can automatically adjust the above parameters according to the test requirements. Therefore, the power module switching performance test system provided by the embodiments of the present disclosure can configure a large number of parameters such as voltage and current at the same time, and the controller 104 can cooperate to control each device, so that during the test, first control the high-voltage power supply 101 to start output according to the initial voltage value and initial current value according to the parameter settings, then control the signal generator 102 to generate corresponding signals according to the parameter settings, and the pulse width of the generated signal is adjusted step by step according to the preset pulse width adjustment gradient until the target pulse width is reached. Then control the initial current value output by the high-voltage power supply 101 to be adjusted step by step to the next current gradient value according to the preset current adjustment gradient, and adjust the pulse width of the signal generated by the signal generator 102 again according to the above cycle. When the initial current value output by the high-voltage power supply 101 is adjusted step by step to reach the target current according to the preset current adjustment gradient, control the initial voltage value output by the high-voltage power supply 101 to be adjusted step by step to the next voltage gradient value according to the preset voltage adjustment gradient, and then adjust the pulse width of the signal generated by the signal generator 102 and the current value output by the high-voltage power supply 101 according to the above cycle until the voltage target value is reached, and the test ends.
[0063] During the test, the controller 104 can control the loss characteristic collector 103 to collect the switching loss characteristic parameters of the power module while the signal generator 102 outputs pulse signals. The test system used in this solution replaces the manual test process, can accurately obtain a large amount of test data without manual adjustment, and can collect test data in a timely manner, greatly shortening the test time and improving the test efficiency of the switching performance of the power module.
[0064] In the embodiments of the present disclosure, the power module 105 to be tested includes a power amplifier and an insulated gate bipolar transistor. The loss characteristic collector 103 is connected to the working end of the insulated gate bipolar transistor. Therefore, the loss characteristic parameters of the power module 105 to be tested collected by the loss characteristic collector 103 during the working process include the working end voltage and working end current of the insulated gate bipolar transistor in the power module. Since the power output end of the power amplifier is connected to the control end of the insulated gate bipolar transistor in the power module 105 to be tested, a low-voltage power supply needs to be set to provide a driving voltage for the power amplifier of the power module 105 to be tested.
[0065] In the power module switching performance test system provided by the embodiments of the present disclosure, a low-voltage power supply is used to provide a driving voltage to the power amplifier of the power module 105 to be tested, and the gate voltage of the insulated gate bipolar transistor in the power module 105 to be tested is collected by the loss characteristic collector 103, so that the power module can operate normally and ensure that the power module switching performance test can be carried out normally.
[0066] In a power module switching performance test system proposed by the embodiments of the present disclosure, the entire test program can be designed through Labview software to complete the automation of the power module switching performance test. Labview is a program development environment that can conveniently and quickly write various programs and control instructions, etc. In this application, the switching performance test program is written by Labview software, and then the high-voltage power supply, signal generator, loss characteristic collector, controller, memory, low-voltage power supply and other devices are controlled by the controller to complete the corresponding test process, realizing configuration automation, data extraction automation, data analysis automation, and finally realizing switching test automation. Therefore, a large amount of time cost and labor cost are saved, and at the same time, the test efficiency is significantly improved.
[0067] In a power module switching performance test system proposed by the embodiments of the present disclosure, the test needs to be initialized before starting the test. The initialization of the low-voltage power supply, signal generator and loss characteristic collector is completed through the VISA interface; the initialization of the high-voltage power supply is completed through the ModBus communication method.
[0068] In a power module switching performance test system proposed by the embodiments of the present disclosure, when the maximum value of the test data exceeds the vertical axis range on the screen of the loss characteristic collector during data collection, the vertical axis range is automatically expanded so that the entire trigger waveform can be displayed on the screen of the loss characteristic collector. Since the loss characteristic collector can change the vertical coordinate range in real time according to the collected data, it can avoid the situation of failure to collect data when manually collecting data, ensuring the accuracy of data collection. The loss characteristic collector also collects and reads test data through the ModBus communication method.
[0069] During the process of using an automated method to test the switching performance, problems such as mismatched working timings of the test equipment may occur. For example, after the signal generator sends a pulse signal to the power module under test, the loss characteristic collector cannot be triggered, resulting in the loss characteristic collector getting stuck and unable to detect and save data. In a power module switching performance test system proposed in an embodiment of the present disclosure, by writing instructions through VISA in the control system, it can be ensured that the loss characteristic collector enters the trigger state before the signal generator sends a pulse signal to the power module under test, thereby ensuring the normal triggering of the loss characteristic collector to ensure that all test data can be collected, greatly improving the working stability and further shortening the test time.
[0070] In an embodiment of the present disclosure, Figure 2 is a flowchart of a power module switching performance test system according to an embodiment of the present disclosure, as Figure 2 described, a flowchart of a power module switching performance test system includes S201 - S210.
[0071] Initialization of test equipment S201: The test equipment includes a signal generator, a loss characteristic collector, a low - voltage power supply, and a high - voltage power supply; the signal generator, the loss characteristic collector, and the low - voltage power supply are initialized through the VISA interface, and the initialization of the high - voltage power supply is carried out through the ModBus communication method.
[0072] Power - on of the low - voltage power supply S202: The controller is used to configure the low - voltage power supply to output a given voltage and set the over - current value at the same time.
[0073] Power - on of the high - voltage power supply S203: The controller controls the high - voltage power supply to output a given voltage according to the voltage value gradient and sets the over - current value at the same time.
[0074] Configuration of signal generator parameters S204: The controller is used to configure relevant parameters such as trigger mode, trigger interval time, number of pulses, pulse duty cycle, pulse period, pulse amplitude, pre - pulse time, post - pulse time, etc. to meet the test requirements.
[0075] Configuration of loss characteristic collector parameters S205: The controller is used to configure relevant parameters such as channel input impedance, channel probe attenuation, time base, trigger amplitude and mode, vertical axis range, trigger position, recorded data length, etc. to meet the test requirements.
[0076] The loss characteristic collector enters the trigger state S206: After the signal generator output is enabled, the controller controls the oscilloscope to trigger according to the configuration of the trigger channel to ensure that test data can be collected.
[0077] The signal generator outputs a control pulse signal S207: The controller controls the signal generator to use the internal trigger mode to send pulses with a given quantity and a given voltage. And the high-level pulse width time is gradually increased according to the given gradient, so as to obtain the switch test data at a specific current value.
[0078] The loss characteristic collector is triggered to acquire and save data S208: The controller controls the oscilloscope to save the full-screen data after triggering, and saves the file to the local folder for subsequent processing; and reads the saved test data. When the current exceeds a certain value, this loop ends. At the same time, the maximum value in each channel is read. When the maximum value exceeds the vertical axis range of the oscilloscope, the vertical axis range is automatically expanded so that the oscilloscope can display the entire triggered waveform, while ensuring the normal function of the data saving.
[0079] Detect the test progress S209: When the pulse width of the signal generated by the signal generator reaches the target pulse width, the controller controls the initial value of the current output by the high-voltage power supply to be adjusted to the next current gradient value successively according to the preset current adjustment gradient. Then, the pulse width of the signal generated by the signal generator is adjusted again according to the above loop. When the initial value of the current output by the high-voltage power supply reaches the target current successively according to the preset current adjustment gradient, the controller controls the initial value of the voltage output by the high-voltage power supply to be adjusted to the next voltage gradient value successively according to the preset voltage adjustment gradient. Then, the pulse width of the signal generated by the signal generator and the current value output by the high-voltage power supply are adjusted according to the above loop until the voltage target value is reached.
[0080] Power down the test equipment S210: Before the test ends, power down the low-voltage power supply and the high-voltage power supply in sequence, and turn off the signal generator and the loss characteristic collector, and the entire test work is completed.
[0081] It should be noted that in this article, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "comprising a..." does not exclude the presence of additional identical elements in the process, method, article or device comprising the element.
[0082] The above are only specific embodiments of the present disclosure, enabling those skilled in the art to understand or implement the present disclosure. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present disclosure. Therefore, the present disclosure will not be limited to these embodiments described herein, but rather will conform to the broadest scope consistent with the principles and novel features disclosed herein.
Claims
1. A power module switching performance test system, characterized in that, it includes a high-voltage power supply, a signal generator, a loss characteristic collector, and a controller; the high-voltage power supply is used to provide a driving voltage to the working end of the power module to be tested; the signal generator is used to output a control pulse signal to the control end of the power module to be tested; the loss characteristic collector is used to collect the loss characteristic parameters of the power module to be tested during the switching control process; the controller is used to control the signal generator to generate a control pulse signal after determining that the loss characteristic collector is in a triggered state, and acquire and store the loss characteristic parameters collected by the loss characteristic collector.
2. The system according to claim 1, characterized in that, the controlling the signal generator to generate a control pulse signal includes: the controller controls the signal generator to output a plurality of control pulse signals, wherein the pulse width durations of the plurality of control pulse signals increase or decrease in sequence according to a set gradient duration.
3. The system according to claim 1, characterized in that, the determining that the loss characteristic collector is in a triggered state includes: sending a trigger preparation instruction to the loss characteristic collector, and determining that the loss characteristic collector is in a triggered state after receiving the trigger status indication signal fed back by the loss characteristic collector.
4. The system according to claim 3, characterized in that, before sending the trigger preparation instruction to the loss characteristic collector, the controller is further used for: sending a range setting instruction to the loss characteristic collector so that it sets the parameter acquisition range according to the range setting instruction, and the range setting instruction is determined according to the target voltage and target current output by the high-voltage power supply.
5. The system according to claim 3, characterized in that, before sending the trigger preparation instruction to the loss characteristic collector, the controller is further used for: sending a first parameter configuration instruction to the loss characteristic collector, and the configuration parameters in the first parameter configuration instruction include at least one of the following: input impedance of the acquisition channel, probe attenuation of the acquisition channel, trigger amplitude and acquisition mode, acquisition data amplitude, trigger position, and recorded data duration.
6. The system according to any one of claims 1-5, characterized in that, before controlling the signal generator to generate a control pulse signal, the controller is further used for: determining that the high-voltage power supply is in a set preparation state, and the preset preparation state includes outputting the target voltage and outputting the target current when the working end of the power module to be tested is conducting.
7. The system according to claim 6, characterized in that, the controller determines that the high-voltage power supply is in a set preparation state, including: sending a power supply setting instruction to the high-voltage power supply, and determining that the high-voltage power supply is in a set preparation state after receiving the set feedback information fed back by the high-voltage power supply, wherein the voltage setting instruction includes the target voltage and the target current.
8. The system according to claim 7, characterized in that, before the controller controls the high-voltage power supply to be in a set preparation state, the controller is further used for: Obtain the output voltage and output current of the high-voltage power supply during the previous test, and determine the target voltage and the target current according to the output voltage and the output current; Wherein, when the output current is less than the threshold current, add the test current and the preset gradient current to obtain the target current, and use the test voltage as the target voltage; Alternatively, when the test current reaches the threshold current, add the output voltage and the preset gradient voltage to obtain the target voltage, and increase the target voltage according to the set voltage gradient, and use the initial set current as the target current.
9. The system according to claim 7, wherein, The controller is further configured to control the high-voltage power supply, the signal generator, and the loss characteristic collector to power off when the test voltage of the previous test reaches the threshold voltage and the test current of the previous test reaches the threshold current.
10. The system according to any one of claims 1-5, wherein, Before controlling the signal generator to generate a control pulse signal, the controller is further configured to: Send a second parameter configuration instruction to the signal generator, and the configuration parameters in the second parameter configuration instruction include at least one of the following: trigger mode, trigger interval time, number of pulse signals, pulse signal duty cycle, pulse signal base frequency, pulse signal amplitude, pulse front time, pulse back time.