Rapid test tool for IGBT (Insulated Gate Bipolar Translator) driving board

Abstract

The utility model relates to an IGBT drive board rapid test tool, which comprises a first fixing frame, a second fixing frame and a third fixing frame, the tops of the second fixing frame and the third fixing frame are provided with clamping grooves, the bottom of the first fixing frame is sleeved on the top of the second fixing frame, the bottom of the second fixing frame is sleeved on the top of the third fixing frame, and the clamping grooves are arranged in the clamping grooves. A driving upper plate and a driving lower plate are respectively arranged in the mounting grooves of the first fixing frame and the second fixing frame, a test mainboard is also fixedly arranged in the third fixing frame, and a power supply and a detection element are arranged on the top surface of the test mainboard; the operation steps of workers are greatly simplified, the phenomenon that the detection result is inaccurate due to reverse insertion of a power switch is effectively avoided, a large number of detection elements are arranged on the test mainboard, the integrated voltage / current source module can be utilized, the voltage and current requirements of the IGBT drive board in the full working range can be accurately met, and the test efficiency is improved. The blank of the comprehensive test standard of the IGBT drive board is filled, and the detection result is more accurate.

Description

Technical Field

[0001] The utility model relates to the technical field of IGBT driver board testing, in particular to an IGBT driver board rapid testing tool. Background Art

[0002] The integrated multifunctional IGBT driver board test fixture is a key testing device for IGBT modules and their drive systems in the field of power electronics. It is widely used in the manufacturing process of IGBT modules to participate in the pre-screening and quality control of tube cores. Through fault simulation and protection mechanism testing, it can effectively eliminate potential early failure products and improve yield and reliability.

[0003] The existing IGBT driver board test tooling has relatively simple functions. Not only is the detection function not comprehensive, but workers need to be equipped with a large number of detection equipment for repeated testing. In addition, the existing test tooling lacks positioning function, and workers need to manually align the driver board and test board up and down, which greatly affects the detection efficiency. Utility Model Content

[0004] Based on the above description, the utility model provides an IGBT driver board rapid testing tool to solve the shortcomings of existing testing tooling, which has relatively single detection function and cannot effectively detect the performance and protection mechanism of the driver board under complex working conditions. In addition, it requires the use of multiple devices for continuous testing, resulting in low detection efficiency and affecting product production efficiency.

[0005] The utility model is realized through the following technical solutions:

[0006] A quick test tool for an IGBT driver board comprises a first fixed frame, a second fixed frame and a third fixed frame, wherein the tops of the second fixed frame and the third fixed frame are both provided with a card slot, the bottom of the first fixed frame is sleeved on the top of the second fixed frame, and the bottom of the second fixed frame is sleeved on the top of the third fixed frame, wherein a rectangular opening is arranged on one side of the first fixed frame and the second fixed frame, and the rectangular opening continues inward to form an installation slot, a driving upper plate and a driving lower plate are respectively provided in the installation slots of the first fixed frame and the second fixed frame, and a test mainboard is also fixedly installed inside the third fixed frame, and a power supply and a detection element are provided on the top surface of the test mainboard.

[0007] Furthermore, the first fixing frame, the second fixing frame and the third fixing frame become larger from top to bottom, and positioning holes are provided at the four corners of the bottom surface of the card slot. A damping spring is provided inside each positioning hole, and a flat plate is provided at the top of the damping spring.

[0008] Furthermore, connecting parts are respectively provided on both sides of the bottom of the card slot, and the connecting parts protrude upward and have an arc-shaped block formed on the top. A positioning groove is respectively provided on both sides of the bottom surface of the first fixed frame and the second fixed frame, and a spring self-locking buckle is provided in the positioning groove. When the connecting part is fully inserted into the positioning groove, the arc-shaped block is fixed inside the spring self-locking buckle, and the damping spring is completely retracted into the positioning hole, and the flat plate is arranged flush with the bottom surface of the card slot.

[0009] Furthermore, a slide groove is provided on the outer side walls of the first fixed frame and the second fixed frame, and the slide groove extends inward and is connected to the interior of the positioning groove. An adjustment handle is provided on the end face of the spring self-locking buckle and extends to the outside through the slide groove.

[0010] Furthermore, a fixing plate is provided in the installation groove, the center of the fixing plate is hollowed out and an elastic pad is provided on the bottom surface, and the elastic pad is fitted with four sides of the top surface of the driving upper plate or the driving lower plate.

[0011] Furthermore, threaded holes are respectively provided at the four corners of the top surfaces of the first fixing frame and the second fixing frame, and the threaded holes extend downward and are connected to the mounting grooves. An insertion rod is provided in each threaded hole, and the bottom end of the insertion rod abuts against the top surface of the fixing plate, and a thread matching the threaded hole is also provided on the side wall of the upper half of the insertion rod.

[0012] Furthermore, an adjusting cap is provided at the top end of the insertion rod, and an outer side wall of the adjusting cap is provided with anti-slip patterns.

[0013] Furthermore, the third fixing frame is provided with a control switch, which is electrically connected to the power supply, and there are a number of wiring holes around the control switch, each of which is electrically connected to the test mainboard through a wire.

[0014] Compared with the prior art, the technical solution of this application has the following beneficial technical effects:

[0015] 1. The present application is an improvement based on the existing IGBT driver board detection equipment. The upper board, lower board and test main board are installed separately through three fixing frames of different sizes. Then, the upper board, lower board and test board are electrically connected through the mutual socketing of the fixing frames to complete the detection of the driver upper board, which greatly simplifies the operation steps of the staff and effectively avoids the phenomenon of inaccurate detection results caused by the power switch being plugged in incorrectly. Moreover, a large number of detection elements are arranged on the test main board. This integrated voltage / current source module can be used to accurately provide the voltage and current requirements of the IGBT driver board within the full working range, ensuring that the test conditions are close to actual applications, filling the gap in the comprehensive test standards of the IGBT driver board, and its detection results are more accurate. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 Schematic diagram of the structure of the first fixed frame, the second fixed frame and the third fixed frame in this embodiment;

[0017] Figure 2 Schematic diagram of the top surface structure of the second fixing frame in this embodiment;

[0018] Figure 3 Schematic diagram of the back structure of the second fixing frame in this embodiment;

[0019] Figure 4 This is a schematic structural diagram of the spring self-locking buckle in this embodiment;

[0020] Figure 5 This is a schematic diagram of the structure of the test motherboard in this embodiment;

[0021] Figure 6 This is a schematic diagram of the working principle structure of the test motherboard in this embodiment;

[0022] Figure 7 Schematic diagram of the top surface structure of the upper plate of the IGBT driver board in this embodiment;

[0023] Among them: 1. First fixed frame; 2. Second fixed frame; 3. Third fixed frame; 4. Card slot; 41. Positioning hole; 42. Damping spring; 43. Connecting part; 5. Mounting slot; 51. Fixed plate; 52. Insert rod; 6. Test mainboard; 61. Power supply; 62. Detection element; 7. Positioning slot; 71. Spring self-locking buckle; 72. Adjustment handle; 8. Slide slot. DETAILED DESCRIPTION

[0024] To facilitate understanding of the present application, the present application will be described more fully below with reference to the accompanying drawings. The accompanying drawings provide embodiments of the present application. However, the present application may be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to make the disclosure of the present application more thorough and comprehensive.

[0025] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application pertains. The terms used herein in the specification of this application are for the purpose of describing specific embodiments only and are not intended to limit this application.

[0026] Combine Figure 1-7As shown, a quick test tool for an IGBT driver board includes a first fixing frame 1, a second fixing frame 2 and a third fixing frame 3. The volumes of the three fixing frames increase successively, wherein the tops of the second fixing frame 2 and the third fixing frame 3 are provided with a card slot 4, the first fixing frame 1 is sleeved in the card slot 4 at the top of the second fixing frame 2, and the bottom of the second fixing frame 2 is sleeved in the card slot 4 at the top of the third fixing frame 3, so that the three are arranged concentrically up and down.

[0027] An opening is also arranged on the side walls of the first fixed frame 1 and the second fixed frame 2, and a mounting groove 5 is formed inwardly extending from the opening. The upper plate of the IGBT driver board is inserted into the mounting groove 5 of the first fixed frame 1 through the opening, and the lower plate is inserted into the mounting groove 5 of the second fixed frame 2 through the opening.

[0028] At the same time, the test main board 6 is directly fixed on the top surface of the third fixed frame 3, and a number of metal joints are vertically provided on the top surface, which are just connected to the metal interface on the surface of the lower plate inside the second fixed frame 2, so as to detect it. This metal interface and metal joint method is also used in the upper and lower plates of the IGBT driver board for electrical connection, so as to cooperate with the first fixed frame, the second fixed frame and the third fixed frame for rapid alignment and improve detection efficiency.

[0029] The top surface of the test mainboard 6 is provided with a power supply 61 and a detection element 62. The power supply 61 adopts a ±15V, +5V DC power supply 61; the detection element 62 includes: a power supply voltage sampling detection (function: to detect whether the power supply circuit of the driver board to be tested is abnormal), a TLC555 multivibrator to generate a PWM waveform (function: to provide a driving signal for the driver board), a dummy load circuit (function: applicable to IGBT modules of various specifications), a fault signal latch and reset (function: to record the error signal of the driver board for the tester to check). Its operating principle is as follows: Figure 4 shown.

[0030] The card slot 4 forms a stepped surface on the top surface of the second fixed frame 2 and the third fixed frame 3, and positioning holes 41 are respectively provided at the four corners of the stepped surface. A damping spring 42 is provided in each positioning hole 41. A flat plate is provided on the top of the damping spring 42, and the flat plate is abutted against the bottom surface of the top fixed frame, and the bottom is fixedly connected to the inner bottom surface of the positioning hole 41.

[0031] The bottom surface of the card slot 4 is further provided with a connecting portion 43 on both sides. The connecting portion 43 is raised upward and forms an arc block at the top. The bottom surfaces of the first fixing frame 1 and the second fixing frame 2 are correspondingly provided with a positioning groove 7. The interior of the positioning groove 7 is provided with a spring self-locking buckle 71. The spring self-locking buckle 71 is as shown in FIG. Figure 4 As shown; (This structure can also be replaced by a push-type self-locking buckle, such as a door buckle switch)

[0032] When the connecting portion 43 is squeezed downward, the arc block at its top can squeeze open the two arc ends at the top of the spring self-locking buckle 71 through the arc outer wall and be completely inserted into the positioning groove 7. At this time, the arc block is just fixed inside the spring self-locking buckle 71, and the bottom surface of the fixing frame squeezed downward together will push the damping spring 42 downward, causing it to completely shrink into the positioning hole 41 until the flat plate is arranged flush with the bottom surface of the slot 4.

[0033] A slide groove 8 is further provided on the outer side wall of the first fixed frame 1 and the second fixed frame 2, and the slide groove 8 is used to communicate with the positioning groove 7. An adjustment handle 72 is provided on the side wall surface of the spring self-locking buckle 71 and is slidably inserted into the inside of the slide groove 8. By toggling the adjustment handle 72, it moves along the direction of the slide groove 8, so that the two fixed ends of the elastic self-locking buckle can be unfolded to separate the upper and lower connected fixed frames.

[0034] A square-shaped fixing plate 51 is also provided in the mounting groove 5. An elastic pad is provided on the downward side of the fixing plate 51. When the upper plate or the lower plate of the IGBT driver board is inserted into the mounting groove 5, the four sides of the fixing plate 51 can be fixed by pressing down to prevent it from shaking, so as to facilitate subsequent electrical connection. That is, the upper plate and the lower plate of the IGBT driver board are connected by plugging and fixing between the two fixing frames, or the lower plate of the IGBT driver board is connected to the test board.

[0035] To facilitate the adjustment of the fixing plate 51, threaded holes should be set at the four corners of the top surfaces of the first fixing frame 1 and the second fixing frame 2, and an insertion rod 52 should be set inside. The bottom end of the insertion rod 52 is in contact with the top surface of the fixing plate 51, and its side wall is also provided with a threaded section that matches the threaded hole. A regular hexagonal adjustment cap is provided on the top of the insertion rod 52, and the outer wall of the adjustment cap is also provided with anti-slip grooves; the staff can move the insertion rod 52 downward by twisting its adjustment cap, thereby quickly fixing the upper plate or lower plate of the IGBT driver board.

[0036] The third fixed frame 3 is also provided with a control switch, which is electrically connected to the power supply 61 on the test main board 6. At the same time, a number of interfaces are arranged on its side walls. Each interface is electrically connected to the test main board 6 through a wire and is used to control its upper board or lower board to simulate various fault conditions.

[0037] Combined with the above structure, the test of the IGBT driver board is mainly divided into upper board test and lower board test, and the steps are as follows:

[0038] IGBT driver board board test;

[0039] ① Supply 15V voltage to a test board, test the tool power supply 61 indicator to be normal, and measure the voltage of the test point to be 5V. Then connect a set of verified IGBT driver board lower and upper boards, and rotate the blue knob at the bottom of the test board to adjust the output frequency to about 30kHz.

[0040] ② Separately install the upper and lower boards of the IGBT driver board and the test main board 6 in the first fixing frame 1, the second fixing frame 2 and the third fixing frame 3, and splice them in sequence so that the lower board is connected to the test point on the test main board 6, and the upper board is connected to the lower board through the pin header pins;

[0041] ③ Check whether the pins of the test main board 6, lower board, and upper board correspond to each other, and whether the wiring has poor contact; (If there is poor contact or the lower board is damaged, the input current of power supply 61 will be very small)

[0042] ④ Turn on the power supply 61 on the test main board 6, use the DC power supply 61 (constant voltage 15V) to power the IGBT driver board, and connect the power supply 61 line to the power supply 61 pin of the driver board;

[0043] ⑤ Test by measuring the lower bridge voltage and upper bridge voltage of the IGBT driver board. The test points are Figure 7 The voltage across the four resistors A, B, C, and D in the diagram is: the voltage across resistors A and C is +15V, and the voltage across resistors B and D is about -9V; (This measurement point can be established by arranging the measuring equipment in advance and then connecting it to the switch on its top surface with a wire)

[0044] IGBT driver board unloading test;

[0045] ① Connect a 15V 1.1A DC power supply 61 to the main control board. Pay attention to the positive and negative poles of the power supply 61. After powering on, observe that the current of the power supply 61 is around 0.77V and the voltage is 15V. If it is within this range, you can proceed to the subsequent steps.

[0046] ② Alternate driving test of the upper and lower MOS tubes: If step ① is completed normally, turn off the power supply 61, connect the oscilloscope to the test motherboard 6, and start the switch simulating the upper MOS tube failure at the same time to observe its waveform. Then test the upper MOS tube for its normal waveform. Finally, continue to amplify the normal waveform and observe its rising edge. If the rising edge is around 1us, it is normal.

[0047] ③ Upper and lower MOS tubes alternately drive the lower tube test: If step ② is completed normally, turn the fault switch of the upper MOS tube and the fault switch of the upper MOS tube to the fault state, then power on and observe the waveform on the oscilloscope; then test the fault waveform of the upper MOS tube and turn the fault switch of the lower tube to the normal state; finally, continue to amplify the normal waveform and observe its rising edge. If the rising edge is about 1us, it is normal.

[0048] Existing testing equipment lacks an integrated, multi-functional testing system to comprehensively verify the performance and protection mechanism of the driver board under complex working conditions. The structure adopted in this embodiment can just make up for the shortcomings of existing testing technology in simulating real working environments, fault detection and protection function evaluation, thereby filling the gap in comprehensive testing standards for IGBT driver boards and meeting a wide range of testing needs from general to high-power IGBT modules.

[0049] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the technical solutions of the embodiments of the present invention.

Claims

1. A quick test tool for IGBT driver board, characterized in that: The invention comprises a first fixed frame (1), a second fixed frame (2) and a third fixed frame (3), wherein the tops of the second fixed frame (2) and the third fixed frame (3) are both provided with a card slot (4), the bottom of the first fixed frame (1) is sleeved on the top of the second fixed frame (2), and the bottom of the second fixed frame (2) is sleeved on the top of the third fixed frame (3), wherein one side of the first fixed frame (1) and the second fixed frame (2) is provided with a rectangular opening, and the rectangular opening is extended inward to form a mounting slot (5), and a driving upper plate and a driving lower plate are respectively provided in the mounting slots (5) of the first fixed frame (1) and the second fixed frame (2), and a test mainboard (6) is also fixedly installed inside the third fixed frame (3), and a power supply (61) and a detection element (62) are provided on the top surface of the test mainboard (6).

2. The IGBT driver board rapid testing tool according to claim 1, characterized in that: The first fixing frame (1), the second fixing frame (2) and the third fixing frame (3) are successively larger from top to bottom, and positioning holes (41) are provided at four corners on the bottom surface of the slot (4), and a damping spring (42) is provided inside each positioning hole (41), and a flat plate is provided at the top end of the damping spring (42).

3. The IGBT driver board rapid testing tool according to claim 2, characterized in that: The bottom of the card slot (4) is provided with a connecting portion (43) on both sides, the connecting portion (43) is upwardly protruding and has an arc block formed on the top, and the bottom surfaces of the first fixed frame (1) and the second fixed frame (2) are provided with a positioning groove (7) on both sides, and a spring self-locking buckle (71) is provided in the positioning groove (7). When the connecting portion (43) is fully inserted into the positioning groove (7), the arc block is fixed in the spring self-locking buckle (71), and the damping spring (42) is fully retracted into the positioning hole (41), and the flat plate is arranged flush with the bottom surface of the card slot (4).

4. The IGBT driver board rapid testing tool according to claim 3, characterized in that: A sliding groove (8) is further provided on the outer side walls of the first fixed frame (1) and the second fixed frame (2), and the sliding groove (8) extends inwardly and communicates with the interior of the positioning groove (7). An adjustment handle (72) is provided on the end surface of the spring self-locking buckle (71) and extends to the outside through the sliding groove (8).

5. The IGBT driver board rapid testing tool according to claim 1, characterized in that: A fixing plate (51) is provided in the installation groove (5), the center of the fixing plate (51) is hollowed out and an elastic pad is provided on the bottom surface, and the elastic pad is in contact with the four sides of the top surface of the driving upper plate or the driving lower plate.

6. The IGBT driver board rapid testing tool according to claim 5, characterized in that: Threaded holes are respectively provided at the four corners of the top surfaces of the first fixing frame (1) and the second fixing frame (2), and the threaded holes extend downward and communicate with the mounting groove (5). An insertion rod (52) is provided in each threaded hole, and the bottom end of the insertion rod (52) abuts against the top surface of the fixing plate (51), and the upper half side wall of the insertion rod (52) is also provided with a thread that matches the threaded hole.

7. The IGBT driver board rapid testing tool according to claim 6, characterized in that: An adjustment cap is provided at the top end of the insertion rod (52), and an outer side wall of the adjustment cap is provided with anti-slip lines.

8. The IGBT driver board rapid testing tool according to claim 1, characterized in that: The third fixing frame (3) is also provided with a control switch, which is electrically connected to the power supply (61), and there are a number of wiring holes around the control switch, each of which is electrically connected to the test mainboard (6) through a wire.

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