Integrated test control system of power module

Abstract

The utility model discloses an integrated test control system of a power module. The integrated test control system comprises an NTC test loop and an insulation test loop. The system also comprises a change-over switch. The insulation voltage-withstanding tester passes through the NTC test loop and then leads out an NTC test terminal. An insulation test terminal is led out from the insulation voltage-withstanding tester through an insulation test loop; and the insulation test terminal and the NTC test terminal are respectively connected to the test end of the power module to be tested through the change-over switch. Compared with the prior art, the testing device has the advantages that two testing procedures are integrated together, different testing procedures can be rapidly switched through the change-over switch, NTC testing and insulation testing can be rapidly completed, testing efficiency is improved, the procedures of insulation testing and NTC isolation testing are simplified, and operation efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the field of product production testing, and particularly relates to an integrated power module integrated testing control system with insulation testing and NTC isolation testing. Background Art

[0002] In the field of semiconductor production, power modules are common production products. In terms of the safety regulations requirements for power modules, factory testing is required, and the testing contents include insulation testing and NTC isolation testing. In the NTC isolation withstand voltage testing, NTC is the abbreviation of the first letter of English Negative Temperature Coefficient. The NTC isolation withstand voltage testing refers to the isolation withstand voltage testing of the temperature detection functional area on the power module. Only after passing the test can it be shipped as a qualified product. For example, the insulation testing method, device and equipment of the flexible DC converter valve power module with the patent application number 202211289398.6 disclose a method that can realize the insulation testing of the power module. Insulation testing is to test the withstand voltage characteristics between the bottom plate of the product and the electrical circuit of the product, that is, to test the creepage characteristics of the ceramic solder. The positive pole of the test voltage is applied to the bottom plate of the product, and the negative pole is applied to the electrical pins of the product. NTC isolation testing is to test the electrical isolation characteristics between the applied electrical circuit of the product and the NTC resistance circuit. The positive pole of the test voltage is loaded on the electrical pins of the product, and the negative pole is applied to the NTC functional pins. Generally, there is an NTC detection area and a product functional area on the power module product. The NTC detection area is the temperature detection functional area on the power module. Because the NTC is very close to the product functional area, it is necessary to test the creepage distance from the NTC to the product functional area.

[0003] In the prior art, both insulation testing and NTC testing adopt a separate testing scheme, that is, the power module is respectively connected to the insulation testing circuit for insulation testing, and after the testing is completed, the power module is connected to the NTC testing circuit for NTC testing. The two tests are carried out on different tooling testing stations, which are two testing processes. Each testing process requires retooling operations and testing connections, resulting in a long process and many steps, affecting the effect of the testing operation. Summary of the Utility Model

[0004] The purpose of the utility model is to overcome the deficiencies of the prior art and provide an integrated testing control system for power modules. The NTC testing and insulation testing circuits are integrated and switched through a switch to form a testing process to quickly meet the requirements of the two functional tests and reduce the steps of the testing operation.

[0005] To achieve the above object, the technical solution adopted by the present utility model is as follows: An integrated test control system for a power module, comprising an NTC test circuit and an insulation test circuit; the system further includes a changeover switch, and an insulation withstand voltage tester leads out NTC test terminals after passing through the NTC test circuit; the insulation withstand voltage tester leads out insulation test terminals through the insulation test circuit; the insulation test terminals and the NTC test terminals are respectively connected to the test terminals of the power module to be tested through the changeover switch. The changeover switch is used to select the NTC test circuit or the insulation test circuit to be connected to the power module to be tested.

[0006] The control system further includes a manual input module, a changeover controller, and a changeover switch; the manual input module is used to input the changeover signal of the tester, its output end is connected to the changeover controller, and the output end of the changeover controller is connected to the changeover switch to drive the changeover switch to act.

[0007] The manual input module includes a button, a key or a touch switch.

[0008] The changeover switch is an electronic switch, which has two switch contacts for respectively controlling the connection of the insulation test circuit or the NTC test circuit to the power module to be tested.

[0009] The electronic switch includes a relay.

[0010] The NTC test circuit and the insulation test circuit are integrated on the same substrate.

[0011] The advantages of the present utility model are as follows: Integrating two test processes together, the changeover switch can quickly switch to different test processes, and the NTC test and the insulation test can be quickly completed, improving the test efficiency, simplifying the processes of insulation test and NTC isolation test, and enhancing the operation efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The following briefly describes the content expressed in each drawing of the specification of the present invention and the marks in the drawings:

[0013] Figure 1 It is an electrical connection schematic diagram of the test system of the present utility model;

[0014] Figure 2 It is a control schematic diagram of the changeover switch of the present utility model. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0015] The following further describes in detail the specific embodiments of the present invention by describing the optimal embodiments with reference to the drawings.

[0016] Since the insulation test and the NTC test in the prior art require two test processes, it is necessary to process at two workstations and perform two wiring disassembly operations, resulting in a cumbersome process and low test operation efficiency. To solve this problem, this embodiment provides an integrated test solution. The main content of the solution is to integrate the two separate steps of the original insulation test and the NTC isolation test to achieve integrated testing, which only requires one wiring and uses a changeover switch to achieve the switching between the two tests, reducing the test operation process and improving the test operation efficiency.

[0017] As Figure 1As shown in the figure, an integrated test control system for a power module includes an NTC test circuit, an insulation test circuit, a switching switch, a product under test, and an insulation withstand voltage tester. The product under test is a power module product. When the power module is subjected to factory inspection, it needs to be subjected to insulation detection and NTC isolation test respectively. In order to simplify the test process, in this solution, the NTC test circuit and the insulation test circuit are integrated together, such as integrated on the same substrate (PCB board) as a detection module. The insulation withstand voltage tester mainly provides a high-voltage signal for testing and obtains test result information. The insulation withstand voltage tester has input and output terminals. The output terminal of the insulation withstand voltage tester leads out an NTC test terminal after passing through the NTC test circuit. For example, the insulation withstand voltage tester can use the Kikusui KI KUSU I TOS9201 insulation withstand voltage tester, which has the functions of insulation test and withstand voltage test and can automatically test only by completing the connection. The insulation withstand voltage tester leads out an insulation test terminal through the insulation test circuit. The insulation test terminal and the NTC test terminal are respectively connected to the test terminals of the power module under test through the switching switch. The test terminals are also divided into input and output. The input is connected to the switching switch, and the output is correspondingly connected to the input terminal of the insulation withstand voltage tester for collecting test results. The test terminals of the power module under test are different according to different test contents. For example, during NTC test, they are respectively the electrical pins and NTC function pins of the power module; during insulation test, they are respectively the product bottom plate and product electrical pins, and they can be connected according to the test requirements and connected to the switching switch. When conducting the test, the prior art is to first connect the insulation withstand voltage tester to the insulation test circuit, then connect the insulation test circuit and the power module under test, and then conduct the test. After the test is completed, the connection is disassembled; then enter the NTC test process, connect the insulation withstand voltage tester to the NTC test circuit, and then connect the NTC test circuit to the power module under test. This way of connection and disconnection is cumbersome and affects the efficiency. After adopting the solution of the present embodiment, since the insulation test circuit and the NTC test circuit are integrated together, that is, both are integrated on a substrate, when wiring, one-time wiring and two-time use can be achieved, without repeated disconnection operations. Once the wiring connection relationship is completed, when insulation test and NTC test are required, only by using the switching switch, the connection relationship of the power module under test can be switched to be connected to the insulation test circuit or the NTC test circuit, so as to meet the test requirements and not require multiple disconnection operations, improving the test efficiency.

[0018] In a preferred embodiment of the present application, the switching switch uses weak electricity to control strong electricity. Since the voltage applied to the power module by the insulation withstand voltage tester during testing through the insulation test loop or the NTC test loop may exceed the human body safety voltage, and for operation safety and convenience, the switching switch is implemented in the way of using weak electricity to control strong electricity, that is, the switching action signal is input manually through the input module to the switching controller, and the switching controller drives the action of the switching switch. The connection relationship is that the manual input module is used to input the switching signal of the tester, and its output terminal is connected to the switching controller, and the output terminal of the switching controller is connected to the switching switch to drive the switching switch to act. Among them, the manual input module includes but is not limited to using buttons, keys or touch switches to realize the input of the switching signal. When the tester needs to switch during the test, the switching signal is input through keys, buttons, touch switches, etc. and sent to the switching controller. The switching controller is a controller with the function of driving an electronic switch, and can be implemented by a low-cost controller, such as a 51 series single-chip microcomputer or a low-end controller of the SMT32 series. The switching switch is implemented by an electronic switch, which has two switch contacts for respectively controlling the connection of the insulation test loop or the NTC test loop to the power module to be tested. As Figure 2 shown, a schematic diagram of using a relay to realize an electronic switch; the relay has a coil, a normally open contact and a normally closed contact; the normally open contact and the normally closed contact can be controlled by driving the control relay coil by outputting a corresponding driving voltage from the output terminal of the switching controller. In Figure 2 , the NTC test loop is connected through the normally closed contact, and the insulation test loop is connected through the normally open contact. After the insulation withstand voltage tester is connected to the insulation test loop, the NTC test loop, the switching switch, and the power module to be tested are completed, and after the insulation withstand voltage tester is started to work, the actually connected loop is the loop between the insulation withstand voltage tester, the NTC test loop and the power module to be tested. At this time, the NTC insulation test is carried out on the power module to be tested. After the test is completed, a switching signal is input through a key, a button, etc. At this time, the relay is driven and the normally open contact is disconnected, and the normally closed contact is closed at this time, and the switching will be switched to: the insulation withstand voltage tester is connected to the power module to be tested through the insulation test loop. At this time, the insulation test can be carried out, so that the switching control of the two practical loops can be carried out quickly.

[0019] In view of the drawback of the cumbersome test process in the prior art, this embodiment combines the insulation test and the NTC isolation test into one test process. The difference between the insulation test and the NTC isolation test lies in the different test circuits. By modifying the hardware circuit (adding a controllable switch between the NTC electrical pin and other functional electrical pins of the product), the purpose of switching the circuit function can be achieved, and the insulation test circuit or the NTC isolation test circuit can be directly switched through the switch. The added switching function between the insulation test circuit and the NTC isolation test circuit simplifies the processes of the insulation test and the NTC isolation test and improves the operation efficiency.

[0020] Obviously, the specific implementation of the present invention is not limited by the above methods. As long as various non-substantive improvements are made by adopting the method concept and technical solution of the present invention, they are all within the protection scope of the present invention.

Claims

1. An integrated test control system for a power module, comprising an NTC test circuit and an insulation test circuit; characterized in that: The control system also includes a switching switch, the insulation withstand voltage tester leads out an NTC test terminal after passing through an NTC test circuit; the insulation withstand voltage tester leads out an insulation test terminal through an insulation test circuit; the insulation test terminal and the NTC test terminal are respectively connected to the test end of the power module to be tested through the switching switch; the switching switch is used to select the NTC test circuit or the insulation test circuit to be connected to the power module to be tested.

2. The integrated test control system for a power module according to claim 1, characterized in that: The control system also includes a manual input module and a switching controller; the manual input module is used to input the switching signal of the tester, and its output end is connected to the switching controller, and the output end of the switching controller is connected to the switching switch to drive the switching switch to operate.

3. The integrated test control system for a power module according to claim 2, characterized in that: The manual input module includes a button, a key or a touch switch.

4. An integrated test control system for a power module as claimed in any one of claims 1 to 3, characterized in that: The switching switch is an electronic switch having two switch contacts for respectively controlling the insulation test circuit or the NTC test circuit to be connected to the power module to be tested.

5. The integrated test control system for a power module according to claim 4, characterized in that: The electronic switch includes a relay.

6. An integrated test control system for a power module as claimed in any one of claims 1 to 3, characterized in that: The NTC test circuit and the insulation test circuit are integrated on the same substrate.

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