Drive board self-checking device and power module testing system

Abstract

The application relates to a driving plate self-checking device and a power module testing system. The driving plate self-checking device comprises a probe plate connected with a driving plate and a power module, and a switching device connected with the power module. When the switching device is closed, the power module is bypassed. When the switching device is closed, the signal output by the driving plate is transmitted to the power module through the probe of the probe plate, and then the detection signal for self-checking of the driving plate is returned to the probe plate through the switching device. When the driving plate is installed on the power module testing system and connected with the power module, the driving plate can be detected before the power module is tested, so that the detection reliability and the power module testing efficiency are improved.

Description

Technical Field

[0001] This application relates to the field of power module testing equipment technology, and in particular to a driver board self-testing device and a power module testing system. Background Technology

[0002] The driver board of a power module testing system controls the on / off state of the power module, making it crucial in the testing process. Driver board failures can severely impact testing efficiency and, in severe cases, cause the power module to malfunction. Therefore, fault detection of the driver board is a prerequisite for ensuring high-efficiency power module testing.

[0003] Traditional driver board testing methods involve separating the driver board from other components, powering it independently, and using testing instruments such as multimeters or oscilloscopes to check the power supply and circuit loops. This testing method cannot guarantee that the driver board will still function properly when installed in a power module testing system, resulting in low reliability. Utility Model Content

[0004] Therefore, it is necessary to provide a driver board self-testing device and a power module testing system that can improve the reliability of testing in order to address the above problems.

[0005] The first aspect of this application provides a driver board self-test device, comprising:

[0006] The probe board connects to the driver board and the positive and negative pins of the power module.

[0007] A switching device is connected to the positive and negative pins of the power module, and the switching device bypasses the power module when closed;

[0008] When the switching device is closed, the signal output by the driver board is transmitted to the positive pin of the power module through the probe of the probe board, and then passes through the switching device and the negative pin in sequence before returning to the probe board as a detection signal for self-testing of the driver board.

[0009] The control board connects the drive board and the probe board, and receives the detection signal returned by the probe board.

[0010] In one embodiment, the switching device includes a control unit and a controlled unit. The controlled unit of the switching device is connected to the positive, negative, and three-phase terminals of the corresponding single-phase circuit in the power module. The positive terminal of each single-phase circuit is connected to the positive terminal pin, and the negative terminal of each single-phase circuit is connected to the negative terminal pin. The control unit of the switching device controls the switching on and off of the controlled unit of the switching device. When the controlled unit of the switching device is on, it bypasses the upper and lower bridge arms in the single-phase circuit.

[0011] In one embodiment, the switching device is a relay.

[0012] In one embodiment, the relay includes a control coil, a switch S1, and a switch S2, wherein the switch S1 is connected to the positive terminal and the three-phase terminal of the single-phase circuit, and the switch S2 is connected to the three-phase terminal and the negative terminal of the single-phase circuit.

[0013] In one embodiment, the switching device includes a U-phase switching device, a V-phase switching device, and a W-phase switching device, wherein the U-phase switching device, the V-phase switching device, and the W-phase switching device are respectively connected to the U-phase circuit, the V-phase circuit, and the W-phase circuit in the power module.

[0014] In one embodiment, the U-phase circuit, the V-phase circuit, and the W-phase circuit each include an upper bridge arm and a lower bridge arm. The first end of the upper bridge arm is connected to the positive pin and the controlled part of the switching device. The second end of the upper bridge arm is connected to the first end of the lower bridge arm and the controlled part of the switching device. The second end of the lower bridge arm is connected to the negative pin and the controlled part of the switching device.

[0015] In one embodiment, the switching device is disposed on the control board, and switching is performed based on the control of the control board.

[0016] In one embodiment, the driver board self-test device further includes a power board connected to the control board and supplying power to the control board.

[0017] A second aspect of this application provides a power module testing system, including a driver board and the aforementioned driver board self-test device.

[0018] In one embodiment, the driver board is pluggably disposed on the probe board.

[0019] The aforementioned driver board self-test device and power module test system include a probe board connected to the positive and negative pins of the driver board and power module, and a switching device connected to the positive and negative pins of the power module. When the switching device is closed, it bypasses the power module. When the switching device is closed, the signal output from the driver board is transmitted through the probes of the probe board to the positive pin of the power module, then sequentially through the switching device and the negative pin before returning as a detection signal to the probe board for self-testing of the driver board. A control board connects the driver board and the probe board and receives the detection signal returned by the probe board. When the driver board is installed in the power module test system and connected to the power module, its condition can be checked before the power module is tested, improving testing reliability and power module testing efficiency. Attached Figure Description

[0020] Figure 1This is a structural block diagram of the driver board self-test device in one embodiment;

[0021] Figure 2 This is a schematic diagram of the self-test device for the driver board in one embodiment;

[0022] Figure 3 This is a schematic diagram of the switching device in one embodiment. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0024] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

[0025] It is understood that the term "connection" in the following embodiments should be understood as "electrical connection," "communication connection," etc., if the connected circuits, modules, units, etc., have electrical signal or data transmission with each other.

[0026] When used herein, the singular forms of “a,” “an,” and “the” may also include the plural forms unless the context clearly indicates otherwise. It should also be understood that the terms “comprising,” “including,” or “having,” etc., specify the presence of the stated feature, whole, operation, component, part, or combination thereof, but do not preclude the possibility of the presence or addition of one or more other features, wholes, operations, components, parts, or combinations thereof.

[0027] In one embodiment, such as Figure 1 As shown, a driver board self-test device is provided, including a probe board 140 and a switching device. The probe board 140 is connected to the positive and negative pins of the driver board 130 and the power module. The switching device is connected to the positive and negative pins of the power module. When the switching device is closed, it bypasses the power module. When the switching device is closed, the signal output by the driver board 130 is transmitted through the probes of the probe board 140 to the positive pin of the power module, then passes through the switching device and the negative pin in sequence, and finally returns to the probe board 140 as a detection signal for self-testing the driver board 130. The driver board 130 can be set separately or pluggably mounted on the probe board 140.

[0028] The switching device can be a manual switch or a controlled switch such as a relay. In this embodiment, a controlled switch is used. The switching device specifically includes a control unit and a controlled unit. The controlled unit of the switching device is connected to the positive, negative, and three-phase terminals of the corresponding single-phase circuit in the power module. The positive terminal of each single-phase circuit is connected to the positive pin, and the negative terminal of each single-phase circuit is connected to the negative pin. The control unit of the switching device controls the on / off state of the controlled unit. When the controlled unit is on, it bypasses the upper and lower bridge arms of the single-phase circuit. In this embodiment, a relay is used as the switching device. The relay includes a control coil and a contact switch, with the control coil serving as the control unit and the contact switch serving as the controlled unit.

[0029] Furthermore, such as Figure 1 and Figure 2 As shown, the driver board self-test device also includes a control board 120, which is connected to the driver board 130 and the probe board 140. The control board 120 controls the driver board 130 to output signals to the power module 200, and receives the detection signals returned by the probe board 140 for self-testing the driver board 130. The switching device can be located on the control board 120 or outside the control board 120, and is switched on and off based on the control of the control board 120. The control board 120 may also include a control unit, which is connected to the switching device, the driver board 130, and the probe board 140. The control unit controls the on and off of the switching device, controls the driver board 130 to output signals to the positive pin of the power module 200, and receives the detection signals returned by the probe board 140 to perform self-testing on the driver board 130. The type of control unit is not unique and can be an FPGA, MCU, CPU, or other devices.

[0030] In addition, the driver board self-test device also includes a power supply board 110, which is connected to the control board 120 and supplies power to the control board 120. Specifically, the power supply board 110 can use a low-voltage power supply to provide the voltage required for the operation of the control board 120.

[0031] It is understandable that the number and structure of switching devices will vary depending on the structure of the power module 200. For example... Figure 3 As shown, the power module 200 includes a U-phase circuit, a V-phase circuit, and a W-phase circuit. Each phase circuit includes an upper bridge arm G1 and a lower bridge arm G2. Switching devices include a U-phase switch 122, a V-phase switch 124, and a W-phase switch 126, which are respectively connected to the U-phase, V-phase, and W-phase circuits in the power module. In the U-phase, V-phase, and W-phase circuits, the first end of the upper bridge arm is connected to the positive pin and the controlled part of the corresponding switching device; the second end of the upper bridge arm is connected to the first end of the lower bridge arm and the controlled part of the corresponding switching device; and the second end of the lower bridge arm is connected to the negative pin and the controlled part of the corresponding switching device.

[0032] Specifically, taking a relay as an example of a switching device, the relay includes a control coil, switch S1, and switch S2. Switches S1 and S2 are two contact switches controlled by the relay. The two ends of switch S1 are connected to the positive terminal P of a single-phase circuit and the three-phase terminals (U, V, or W), specifically to the first and second ends of the upper bridge arm. The two ends of switch S2 are connected to the three-phase terminals (U, V, or W) and the negative terminal N of a single-phase circuit, specifically to the first and second ends of the lower bridge arm. The control board 120 controls the relay to engage or disengage. When the relay is engaged, switches S1 and S2 are closed; when the relay is disengaged, switches S1 and S2 are open. The driver board 130 is a circuit board that controls the power module 200 to turn on and off by sending a drive signal to the gate. The probe board 140 has a slot for mounting the driver board 130. The driver board 130 is inserted into the probe board 140, and the probe board 140 is in contact with the pins of the power module 200 in the power module testing system.

[0033] The driver board 130, probe board 140, and power module 200 form a control loop. When testing the power module 200, the probe board 140 contacts the positive P, negative N, and three-phase terminals U, V, and W of each single-phase circuit in the power module 200 through probes. At this time, all three relays in the loop are disconnected, and switches S1 and S2 of each relay are open. The single-phase circuits of phases U, V, and W of the power module 200, from the positive P of the single-phase circuit to the upper bridge arm G1, to the lower bridge arm G2, and then to the negative N of the single-phase circuit, are controlled by the driver board 130 to turn the upper bridge arm G1 and lower bridge arm G2 on or off, thus enabling relevant tests on the power module 200. Meanwhile, the control board 120 controls the driver board 130 to output a wave signal. The wave signal travels from the driver board 130 to the probe board 140, then from the probe board 140 to the power module 200. The signal returned from the power module 200 then travels back to the control board 120 through the probe board 140.

[0034] The self-test of the driver board 130 does not require the participation of the power module 200. The control board 120 controls the three relays corresponding to U, V, and W to be energized, and the internal switches S1 and S2 of the relays to be closed. This closes the circuit from the positive terminal P to switch S1, from switch S1 to the three-phase terminal U (or V or W), from the three-phase terminal U (or V or W) to switch S2, and from switch S2 to the negative terminal N. At this time, the control board 120 controls the driver board 130 to output a wave signal. The wave signal goes from the driver board 130 to the probe board 140, passes through the relays, and then goes from the probe board 140 to the control board 120. If the control board 120 receives a normal signal after the wave detection is completed, it means that the driver board 130 is normal. If it receives an abnormal signal, the driver board 130 is abnormal. The control board 120 can compare the signal output by the drive board 130 with the detection signal returned by the probe board 140. If the two are consistent (e.g., the difference is less than the set error threshold), it means that the drive board 130 can send signals normally. If the signal output by the drive board 130 is different from the detection signal returned by the probe board 140, or if the control board 120 does not receive the detection signal, the drive board 130 can be considered abnormal.

[0035] In one embodiment, a power module testing system is also provided, including a driver board 130 and the aforementioned driver board self-test device. The driver board self-test device specifically includes a power board 110, a control board 120, and a probe board 140. The driver board 130 can be a separate component or pluggably mounted on the probe board 140.

[0036] The power board 110 uses a low-voltage power supply to power the control board 120. Then, the control board 120 controls three relays to close, thus forming a self-test circuit (the circuit runs from the positive terminal P to switch S1, switch S1 to the three-phase terminal U (or V or W), U (or V or W) to switch S2, and switch S2 to the negative terminal N). Then, the control board 120 controls the drive board 130 to generate a low-voltage wave. The low-voltage wave signal goes from the drive board 130 to the probe board 140, passes through the relays, and then goes from the probe board 140 to the control board 120. The control board 120 uses the result of the low-voltage wave to check whether the drive board 130 is normal.

[0037] The low-voltage waveform transmission of driver board 130 is mainly for detecting whether driver board 130 can send signals normally. Abnormal signal or no signal indicates that driver board 130 is malfunctioning, and an alarm will be triggered if driver board 130 is malfunctioning. If the signal returned to control board 120 from the low-voltage waveform transmission is normal, it means that driver board is normal. If driver board 130 is normal, the self-test ends and a message indicates that the test was successful.

[0038] In the power module testing system, a self-test of the driver board 130 is performed before each power module test. This eliminates the need to unplug the driver board 130 each time for the self-test and then reinstall it afterward, avoiding the risk of damage from repeated plugging and unplugging. It also ensures that the driver board 130 has passed the self-test procedure and is functioning correctly before each test. Furthermore, a separate self-test of the driver board 130 can be performed to troubleshoot faults in the power module testing system.

[0039] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0040] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A driver board self-testing device, characterized in that, include: The probe board connects to the driver board and the positive and negative pins of the power module. A switching device is connected to the positive and negative pins of the power module. When the switching device is closed, it bypasses the power module. When the switching device is closed, the signal output by the driver board is transmitted to the positive pin of the power module through the probe of the probe board, and then passes through the switching device and the negative pin in sequence before returning to the probe board as a detection signal for self-testing of the driver board. The control board connects the drive board and the probe board, and receives the detection signal returned by the probe board.

2. The driver board self-testing device according to claim 1, characterized in that, The switching device includes a control unit and a controlled unit. The controlled unit of the switching device is connected to the positive, negative and three-phase terminals of the corresponding single-phase circuit in the power module. The positive terminal of each single-phase circuit is connected to the positive terminal pin, and the negative terminal of each single-phase circuit is connected to the negative terminal pin. The control unit of the switching device controls the on / off state of the controlled unit of the switching device. When the controlled unit of the switching device is on, it bypasses the upper and lower bridge arms in the single-phase circuit.

3. The driver board self-testing device according to claim 2, characterized in that, The switching device is a relay.

4. The driver board self-testing device according to claim 3, characterized in that, The relay includes a control coil, a switch S1, and a switch S2. The switch S1 is connected to the positive terminal and the three-phase terminal of the single-phase circuit, and the switch S2 is connected to the three-phase terminal and the negative terminal of the single-phase circuit.

5. The driver board self-testing device according to claim 2, characterized in that, The switching devices include a U-phase switching device, a V-phase switching device, and a W-phase switching device, which are respectively connected to the U-phase circuit, V-phase circuit, and W-phase circuit in the power module.

6. The driver board self-testing device according to claim 5, characterized in that, The U-phase circuit, the V-phase circuit, and the W-phase circuit each include an upper bridge arm and a lower bridge arm. The first end of the upper bridge arm is connected to the positive pin and the controlled part of the switching device. The second end of the upper bridge arm is connected to the first end of the lower bridge arm and the controlled part of the switching device. The second end of the lower bridge arm is connected to the negative pin and the controlled part of the switching device.

7. The driver board self-test device according to claim 1, characterized in that, The switching device is mounted on the control board and is switched on and off based on the control of the control board.

8. The driver board self-testing device according to claim 1, characterized in that, It also includes a power board, which is connected to the control board and supplies power to the control board.

9. A power module testing system, characterized in that, It includes a driver board and the driver board self-testing device as described in any one of claims 1 to 8.

10. The power module testing system according to claim 9, characterized in that, The driver board is pluggable onto the probe board.

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