A power module low voltage testing device

Abstract

The application discloses a power module low-voltage testing device, and relates to the technical field of testing fixtures, comprising a mounting base, a positioning base mold, a downward pressing mechanism, a control mechanism, a probe mechanism, a lifting column, a jacking mechanism and a low-voltage direct-current power module; the low-voltage direct-current power module is adopted to provide low-voltage direct-current testing input for the tested power module, thereby replacing the traditional alternating-current high-voltage power supply mode, greatly reducing the risk of electric shock of the operator during the testing process, and avoiding the occurrence of the sparking phenomenon in the plugging moment; the lifting column is connected with the downward pressing mechanism at the upper part and the jacking mechanism at the lower part at the same time, the downward pressing testing action and the jacking material taking action are synchronously driven by the same control mechanism, independent driving units and control units do not need to be configured for the downward pressing and the jacking, the overall structure is more compact, the synchronism of the downward pressing and the jacking action is higher, and the testing operation process is simplified.

Description

Technical Field

[0001] This invention relates to the field of test fixture technology, and in particular to a low-voltage test device for power modules. Background Technology

[0002] In testing power supply products (such as power modules containing PFC+LLC circuits), traditional methods typically use 110V or 220V AC voltage as the input to activate the high-voltage circuitry within the product. Instruments then monitor the values, waveforms, and frequencies at various test points. This method of directly applying high AC voltage poses a risk of electric shock to operators and can easily cause arcing during connection. Furthermore, since the product under test operates under high voltage, any malfunction or insulation creep can easily cause severe damage to the internal components, and even damage the testing equipment. In addition, current testing devices often have the handle positioned at the top of the device while the workpiece is positioned below, requiring operators to frequently raise one hand during operation, which is extremely inconvenient. Summary of the Invention

[0003] This invention provides a low-voltage testing device for power modules, which solves the technical problems of electric shock risk to operators due to direct AC high-voltage power supply and inconvenience to operators due to unreasonable placement of the operating handle.

[0004] To address the aforementioned technical problems, this invention provides a low-voltage testing device for a power module, comprising a mounting base, a positioning mold, a pressing mechanism, a control mechanism, a probe mechanism, a lifting column, a jacking mechanism, and a low-voltage DC power module. The positioning mold is disposed on the top surface of the mounting base and is used to place the power module under test. The lifting column is vertically and movably mounted on the mounting base. The pressing mechanism is fixedly connected to the upper part of the lifting column, and the probe mechanism is mounted on the pressing mechanism to form electrical contact with the test point of the power module under test when the pressing mechanism descends. The control mechanism is mounted on the mounting base and is drively connected to the lifting column, driving the lifting column to synchronously raise and lower the pressing mechanism and the jacking mechanism. The jacking mechanism is connected to the lower part of the lifting column and is used to lift the power module under test from the positioning mold when the lifting column rises. The low-voltage DC power module is disposed in the mounting base and is used to output a low-voltage DC test voltage to the power module under test.

[0005] Preferably, the positioning base mold includes a base body and four sets of buffer modules; the base body has circular grooves at its four corners; each set of buffer modules includes a connecting post and a buffer spring, the bottom end of the connecting post is fixed to the mounting base, and the top end of the connecting post is correspondingly accommodated in the circular groove; the buffer spring is sleeved on the outside of the connecting post and elastically supported between the base body and the mounting base.

[0006] Preferably, the pressing mechanism includes a pressing base plate and a base plate mounting module; the pressing base plate has an anti-interference groove, and a pressing rod is provided on the lower surface of the pressing base plate; the probe mechanism is assembled on the pressing base plate; the base plate mounting module includes a guide column, a linear bearing, a fastening knob, and a base lifting plate; the base lifting plate is fixedly connected to the top of the lifting column; the linear bearing is disposed on the base lifting plate, and the outer surface of the linear bearing is provided with an external thread; the side of the pressing base plate is provided with a positioning groove adapted to the outer surface of the linear bearing; the fastening knob cooperates with the external thread of the linear bearing, and the pressing base plate can be clamped and fixed between the fastening knob and the base lifting plate by tightening the fastening knob.

[0007] Preferably, a permanent magnet is provided on the base lifting plate, and a positioning iron piece corresponding to the position of the permanent magnet is provided on the top of the pressing base plate for pre-positioning during the installation of the pressing base plate.

[0008] Preferably, the control mechanism includes a rotating shaft, two bearing seats, a timing belt module, a handle module, a drive gear, a mounting plate, and a lifting rack; both bearing seats are fixed to the mounting base, and the two ends of the rotating shaft are rotatably supported by the two bearing seats respectively; the handle module is disposed at one end of the rotating shaft and is used to drive the rotating shaft to rotate around its own axis; the mounting plate is fixed to the mounting base, and the drive gear is rotatably mounted on the mounting plate; the two pulleys of the timing belt module are coaxially fixedly connected to the rotating shaft and the drive gear respectively; the lifting rack is fixed vertically to the side of the lifting column, and the drive gear meshes with the lifting rack.

[0009] Preferably, the handle module includes a rotating sleeve, an anti-slip handle, a protective spring, and a positioning sleeve; the end surface of the rotating shaft is provided with a flat portion, the rotating sleeve is sleeved on the end of the rotating shaft, and is circumferentially fixed by screws against the flat portion; the anti-slip handle is provided on the side of the rotating sleeve, can slide along the axial direction of the rotating shaft, and can drive the rotating sleeve to rotate synchronously with the rotating shaft; the side of the rotating sleeve is provided with a positioning protrusion, and the side of the positioning sleeve is provided with a positioning groove that matches the positioning protrusion; the protective spring is elastically connected between the rotating sleeve and the bearing seat on the corresponding side.

[0010] Preferably, the probe mechanism includes an adjusting block, a terminal block, a fixing base, a fastening screw, a probe body, and an adjusting resistor; an adjusting hole is provided on the lower pressing base, and the adjusting block is equipped in the adjusting hole in an adjustable manner; the fixing base is fixed on the lower pressing base, and the fastening screw is threaded onto the side of the fixing base, the end of the fastening screw being able to press tightly against the adjusting block to achieve position fixation; the terminal block is disposed at the upper end of the adjusting block, and the probe body is disposed at the lower end of the adjusting block; the terminal block is electrically connected to the probe body via the adjusting resistor.

[0011] Preferably, the lifting mechanism includes a connecting crossbar, a pressure plate, and four sets of lifting components; the middle part of the pressure plate is fixedly connected to the bottom end of the lifting column through the connecting crossbar; the four sets of lifting components are respectively arranged at the four corners of the pressure plate, and each set of lifting components includes a lifting rod, a first limiting plate, a second limiting plate, a third limiting plate, and a lifting spring; the first limiting plate is fixed to the top end of the lifting rod, and the third limiting plate is fixed to the bottom end of the lifting rod; the second limiting plate is fixed to the rod body of the lifting rod and is located between the pressure plate and the mounting base; the lifting spring is sleeved on the outside of the lifting rod and elastically supported between the pressure plate and the third limiting plate.

[0012] Preferably, the lifting mechanism further includes a suction cup module; the suction cup module includes a sealing ring, an air guide pipe, a connecting pipe, and a multi-port fitting; the air guide pipe extends axially through the upper and lower ends of the lifting rod; the sealing ring is disposed on the top of the first limiting plate; one end of the connecting pipe is connected to the lower air passage of the lifting rod, and the other end is connected to the air passage of the multi-port fitting; the multi-port fitting is also used to connect to an external negative pressure air source.

[0013] Preferably, an electrical box is provided at the bottom of the mounting base, and a test instrument, a heat dissipation module, an emergency stop button, and an on / off switch are respectively provided on the top surface of the mounting base; an air source is provided inside the electrical box, and the air source is connected to the air circuit of the suction cup module.

[0014] Compared with related technologies, the low-voltage testing device for power modules provided by this invention has the following advantages:

[0015] This invention uses a low-voltage DC power supply module to provide low-voltage DC test input to the power supply module under test, replacing the traditional AC high-voltage power supply method. This significantly reduces the risk of electric shock to operators during testing and avoids arcing at the moment of connection. At the same time, the performance test of the internal circuit of the product under test can be completed under low-voltage input, avoiding overcurrent, overheating and insulation creepage damage caused by full AC high voltage. This effectively protects the product under test and the test equipment. Moreover, the low-voltage power supply solution has lower power consumption, which helps to reduce the overall size of the equipment and reduce production costs.

[0016] This invention connects the upper pressing mechanism and the lower lifting mechanism simultaneously through a lifting column. The pressing test action and the lifting material removal action are driven synchronously by the same control mechanism. There is no need to configure separate drive units and control units for pressing and lifting. The overall structure is more compact, the synchronization of pressing and lifting actions is higher, and the testing operation process is simplified.

[0017] The lifting mechanism of this invention adopts a free-stroke buffer structure formed by the lifting rod, multiple limiting plates, and lifting spring. During the downward pressing process, the pressure plate compresses the lifting spring and moves downward during the free stroke, while the lifting rod remains stationary. This does not interfere with the pressing contact action between the pressing rod and the probe body, ensuring accurate positioning of the product under test and reliable test connection. During the upward process, the pressure plate first moves upward along the free stroke of the lifting rod under the action of the lifting spring. After contacting the limiting plate, it drives the lifting rod to rise synchronously, smoothly lifting the product under test from the cavity of the positioning mold. This solves the problem of the product under test being difficult to remove by hand after being embedded in the groove, reduces the difficulty of material handling, and reduces the risk of accidentally touching the probe or pulling the test circuit during material handling.

[0018] This invention integrates a suction cup module at the top of the lifting assembly. The air guide pipe inside the lifting rod connects the sealing ring at the top to the negative pressure air source. When lifting the product being tested, the suction cup module adsorbs the bottom of the product through negative pressure, effectively preventing the product from slipping or shifting during the lifting process and improving the stability of the material handling operation.

[0019] The pressing mechanism of this invention adopts a detachable base plate mounting structure. By using a fastening knob in conjunction with a linear bearing with external threads, the pressing base plate can be clamped and fixed on the base lifting plate, making disassembly and replacement convenient. The permanent magnet on the base lifting plate and the positioning iron plate on the pressing base plate can achieve pre-positioning, which facilitates quick alignment during installation and improves product changeover efficiency. The pressing base plate can be customized according to the layout of the fixing points and test points of different models of the tested products, which significantly improves the versatility of the device.

[0020] The probe mechanism of this invention adopts an adjustable block structure that can be adjusted up and down. The extension height of the probe body can be flexibly adjusted and fixed by tightening screws. It can adapt to products of different thicknesses and test points of different heights, ensuring that the probe and test point maintain appropriate contact pressure and improving the stability and consistency of the test signal.

[0021] The positioning base mold of the present invention is equipped with buffer modules at the four corners, which provide elastic buffer support for the base body during the pressing process, avoid rigid pressing impact damage to the tested product, and at the same time make the tested product bear force evenly, thereby improving the reliability of product positioning and pressing.

[0022] The handle module of the control mechanism of this invention is located on the left side of the device, allowing the operator to operate it while seated without standing, effectively improving operational convenience. The handle module achieves stable locking at two working heights through the engagement of a positioning protrusion and a positioning groove: at the downward test height, after releasing the anti-slip handle, the protective spring pushes the handle back to its original position, and the positioning protrusion automatically engages with the corresponding positioning groove, keeping the lifting column in the downward position. This ensures continuous and stable contact between the downward pressure rod and the probe body during testing, eliminating the need for continuous gripping and force application by the operator, thus reducing operational intensity. At the upward material handling height, after releasing the anti-slip handle, the positioning protrusion similarly engages with the corresponding positioning groove, keeping the lifting column in the upward position. The lifting mechanism maintains the product in a lifted state, facilitating safe product handling by the operator and preventing accidental slippage of the lifting column from interfering with the operation process. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0024] Figure 2 This is a schematic diagram of the control mechanism structure of the present invention;

[0025] Figure 3 This is a schematic diagram of the handle module structure of the present invention;

[0026] Figure 4 This is a schematic diagram of the substrate mounting module structure of the present invention;

[0027] Figure 5 This is a schematic diagram of the pressing mechanism of the present invention;

[0028] Figure 6 This is a schematic diagram of the lifting mechanism structure of the present invention;

[0029] Figure 7 This is a schematic cross-sectional view of the lifting assembly of the present invention;

[0030] Figure 8 This is a schematic diagram of the suction cup module structure of the present invention;

[0031] Figure 9 This is a schematic diagram of the positioning bottom mold structure of the present invention;

[0032] Figure 10 This is a schematic diagram of the probe mechanism structure of the present invention.

[0033] Numbered in the diagram: 1. Mounting base; 101. Electrical box; 102. Test instrument; 103. Heat dissipation module; 104. Emergency stop button; 105. On / off switch; 2. Positioning base mold; 200. Buffer module; 201. Base body; 202. Circular groove; 203. Connecting column; 204. Buffer spring; 3. Pressing mechanism; 31. Pressing base plate; 32. Pressing rod; 301. Guide column; 302. Linear bearing; 303. Fastening knob; 304. Base lifting plate; 311. Positioning groove; 313. Permanent magnet; 314. Anti-interference groove; 4. Control mechanism; 41. Rotating shaft; 42. Bearing seat; 43. Synchronous belt module; 44. Handle module; 45. Drive gear; 4 6. Mounting plate; 47. Lifting rack; 411. Flat part; 441. Rotating sleeve; 442. Anti-slip handle; 443. Protective spring; 444. Positioning protrusion; 445. Positioning sleeve; 446. Positioning groove; 5. Probe mechanism; 501. Adjusting block; 502. Terminal block; 503. Fixing seat; 504. Fastening screw; 505. Probe body; 6. Lifting column; 7. Lifting mechanism; 71. Connecting crossbar; 72. Pressure dividing plate; 73. Lifting assembly; 731. Lifting rod; 732. First limiting plate; 733. Second limiting plate; 734. Third limiting plate; 735. Lifting spring; 76. Sealing ring; 77. Air guide pipe; 74. Connecting pipe; 75. Multi-port fitting. Detailed Implementation

[0034] The present invention will be further described in detail below with reference to specific embodiments and accompanying drawings. These embodiments are only for explaining the present invention and do not limit the scope of protection of the present invention. Those skilled in the art can complete the processing, assembly, and final assembly of the machine based on the structure disclosed in these embodiments without any creative effort.

[0035] This embodiment discloses a low-voltage testing device for a power module, including a mounting base 1, a positioning base mold 2, a pressing mechanism 3, a control mechanism 4, a probe mechanism 5, a lifting column 6, a lifting mechanism 7, and a low-voltage DC power module. The mounting base 1 serves as the support and installation foundation for the entire device. An electrical box 101 is installed at its bottom, integrating the low-voltage DC power module, test control circuitry, and air source. The top surface of the mounting base 1 is equipped with a test instrument 102, a heat dissipation module 103, an emergency stop button 104, an on / off switch 105, and a power switch. The test instrument 102 displays test voltage, current, and other parameters in real time. The heat dissipation module 103 provides air cooling for the internal heat-generating components. The emergency stop button 104 cuts off the power supply and air supply in emergency situations. The on / off switch 105 controls the connection and disconnection of the test circuit, and the power switch controls the overall power supply of the device.

[0036] The positioning base mold 2 is disposed in the middle of the top surface of the mounting base 1 and is used to support and position the power module under test. The positioning base mold 2 includes a base body 201 and four sets of buffer modules 200. The four corners of the base body 201 are respectively provided with circular grooves 202. Each set of buffer modules 200 includes a connecting post 203 and a buffer spring 204. The bottom end of the connecting post 203 is fixedly connected to the top surface of the mounting base 1, and the top end of the connecting post 203 is correspondingly accommodated in the circular groove 202. The buffer spring 204 is sleeved on the outside of the connecting post 203 and elastically supported between the base body 201 and the mounting base 1. When the pressing mechanism 3 presses down on the power module under test, the buffer spring 204 can provide elastic buffering to avoid rigid impact damage to the product under test, while ensuring that the product under test is subjected to uniform force.

[0037] The pressing mechanism 3 is fixedly connected to the upper part of the lifting column 6 and is used to drive the probe mechanism 5 to press down to complete the product clamping and test connection. The pressing mechanism 3 includes a pressing base plate 31 and a base plate mounting module. The pressing base plate 31 is provided with an anti-interference groove 314 to avoid protruding parts on the workpiece and avoid mechanical interference during the lifting process. The lower surface of the pressing base plate 31 is provided with a pressing rod 32, which is used to directly press the upper surface of the power module under test during the pressing process.

[0038] The base plate mounting module includes a guide post 301, a linear bearing 302, a fastening knob 303, and a base lifting plate 304. The base lifting plate 304 is fixedly connected to the top of the lifting post 6. The linear bearing 302 is disposed on the base lifting plate 304, and the outer surface of the linear bearing 302 is provided with an external thread that matches the fastening knob 303. The side of the pressing base plate 31 is provided with a positioning groove 311 that matches the outer surface of the linear bearing 302. During assembly, the pressing base plate 31 is inserted into the linear bearing 302 through the positioning groove 311 to achieve radial positioning. By tightening the fastening knob 303, the pressing base plate 31 can be clamped and fixed between the fastening knob 303 and the base lifting plate 304 to achieve detachable installation. The base lifting plate 304 is provided with a permanent magnet 313, and the top of the pressing base plate 31 is provided with a positioning iron piece that matches the position of the permanent magnet 313. When the pressing base plate 31 is installed, the permanent magnet 313 can attract the positioning iron piece to achieve pre-positioning, which facilitates the subsequent locking operation of the fastening knob 303 and improves the accuracy of the installation position.

[0039] The control mechanism 4 is mounted on the left side of the mounting base 1 and is connected to the lifting column 6 for driving the lifting column 6 to move vertically. The control mechanism 4 includes a rotating shaft 41, two bearing seats 42, a synchronous belt module 43, a handle module 44, a drive gear 45, a mounting plate 46, and a lifting rack 47. The two bearing seats 42 are fixed to the top surface of the mounting base 1. The two ends of the rotating shaft 41 are rotatably supported by the two bearing seats 42 respectively. The rotating shaft 41 is arranged horizontally. The handle module 44 is located at the left end of the rotating shaft 41 and extends to the left outer side of the device, allowing the worker to move the handle while seated. Hand-operated, eliminating the need for standing, significantly improving ease of operation; the mounting plate 46 is fixed to the top surface of the mounting base 1, and the drive gear 45 is rotatably mounted on the mounting plate 46; the two pulleys of the synchronous belt module 43 are coaxially and fixedly connected to the rotating shaft 41 and the drive gear 45 respectively, and when the rotating shaft 41 rotates, it can drive the drive gear 45 to rotate synchronously through the synchronous belt module 43; the lifting rack 47 is fixed vertically to the side of the lifting column 6, and the drive gear 45 meshes with the lifting rack 47, and when the drive gear 45 rotates, it can drive the lifting rack 47 and the lifting column 6 to move up and down vertically.

[0040] The handle module 44 includes a rotating sleeve 441, an anti-slip handle 442, a protective spring 443, and a positioning sleeve 445. A flat portion 411 is provided on the left end surface of the rotating shaft 41. The rotating sleeve 441 is fitted onto the left end of the rotating shaft 41 and is circumferentially fixed by screws against the flat portion 411, allowing the rotating sleeve 441 to drive the rotating shaft 41 to rotate synchronously. The anti-slip handle 442 is located on the side of the rotating sleeve 441 and can slide along the axial direction of the rotating shaft 41, while remaining circumferentially fixed relative to the rotating sleeve 441. When the anti-slip handle 442 is held and rotated, it drives the rotating sleeve 441 to rotate synchronously with the rotating shaft 41. The side of the sleeve 441 is provided with a positioning protrusion 444, and the side of the positioning sleeve 445 is provided with a positioning groove 446 that matches the positioning protrusion 444. The protective spring 443 is elastically connected between the rotating sleeve 441 and the bearing seat 42 on the corresponding side, providing axial return force for the anti-slip handle 442. During operation, pulling the anti-slip handle 442 outward causes the positioning protrusion 444 to disengage from the positioning groove 446, and the handle can then be rotated to drive the lifting column 6 to rise and fall. After releasing the anti-slip handle 442, the protective spring 443 pushes the anti-slip handle 442 to return to its original position, and the positioning protrusion 444 engages with the positioning groove 446 to achieve circumferential positioning, keeping the lifting column 6 at its current height. At the downward pressure test height, after releasing the anti-slip handle 442, the protective spring 443 pushes the handle to reset, and the positioning protrusion 444 automatically engages with the corresponding positioning groove 446, keeping the lifting column 6 in the downward pressure position. This ensures that the downward pressure rod 32 and the probe body 505 maintain stable contact during the test, eliminating the need for continuous gripping and force application by the operator, thus reducing operational intensity. At the upward material handling height, after releasing the anti-slip handle 442, the positioning protrusion 444 also engages with the corresponding positioning groove 446, keeping the lifting column 6 in the upward position. The lifting mechanism 7 maintains the product in the lifted state, facilitating safe product handling by the operator and preventing the lifting column 6 from accidentally slipping and interfering with the operation process.

[0041] The probe mechanism 5 is mounted on the lower pressure base plate 31 and is used to form reliable electrical contact with the test points of the power module under test. The probe mechanism 5 includes an adjusting block 501, a terminal block 502, a fixing base 503, a fastening screw 504, a probe body 505, and an adjusting resistor. An adjusting hole is provided on the lower pressure base plate 31, and the adjusting block 501 is mounted in the adjusting hole in an adjustable manner. The fixing base 503 is fixed to the top surface of the lower pressure base plate 31, and the fastening screw 504 is threaded onto the side of the fixing base 503. The fastening end of the fastening screw 504 can be pressed tightly against the side of the adjusting block 501 to fix the height position of the adjusting block 501. The terminal block 502 is located at the upper end of the adjusting block 501 and is used to pass through... An external wiring harness connects to a low-voltage DC power supply module; the probe body 505 is located at the lower end of the adjustment block 501 and is used to directly contact the voltage sampling test point on the PCB of the power supply module under test in the depressed state; the terminal 502 is electrically connected to the probe body 505 via the adjustment resistor, so that the adjustment resistor is connected in series between the low-voltage DC power supply module and the voltage sampling test point of the power supply module under test; the adjustment resistor can be mechanically adjusted to change its resistance value, and by changing the resistance parameter of the sampling circuit to match the start-up threshold of the power supply module under test, the power supply module under test can start up and enter the working state under the low-voltage DC input state. At the same time, the adjustment resistor can limit the test circuit current, smooth signal fluctuations, and protect the product under test and the test instrument 102.

[0042] The lifting column 6 is vertically and vertically mounted inside the mounting base 1. Its upper end extends out of the top surface of the mounting base 1 and is fixedly connected to the base lifting plate 304. Its lower end extends into the interior of the mounting base 1 and is connected to the lifting mechanism 7. As a transmission bearing component, it synchronously drives the pressing mechanism 3 and the lifting mechanism 7 to rise and fall, ensuring the synchronicity of the pressing test action and the lifting material removal action.

[0043] The lifting mechanism 7 is connected to the lower part of the lifting column 6 and is used to smoothly lift the power module under test from the positioning bottom mold 2 after the test is completed, making it easy to remove the material. The lifting mechanism 7 includes a connecting crossbar 71, a pressure plate 72, and four sets of lifting components 73. The middle part of the pressure plate 72 is fixedly connected to the bottom end of the lifting column 6 through the connecting crossbar 71. The four sets of lifting components 73 are respectively set at the four corners of the pressure plate 72. Each set of lifting components 73 includes a lifting rod 731, a first limiting plate 732, a second limiting plate 733, a third limiting plate 734, and a lifting spring 735. The first limiting plate 732 is fixed to the top end of the lifting rod 731, and the third limiting plate 734 is fixed to the lifting rod. At the bottom end of 731, the second limiting plate 733 is fixed to the rod body of the lifting rod 731 and is located between the pressure plate 72 and the mounting base 1; the lifting spring 735 is sleeved on the outside of the lifting rod 731 and elastically supported between the pressure plate 72 and the third limiting plate 734; a free stroke structure is formed between the lifting rod 731 and the pressure plate 72. During the downward pressing process, the pressure plate 72 descends with the lifting column 6 and first compresses the lifting spring 735. At this time, the lifting rod 731 remains stationary to avoid interference with the downward pressing action; during the upward process, the pressure plate 72 rises first under the elastic force of the lifting spring 735 until it contacts the second limiting plate 733, and then drives the lifting rod 731 to rise synchronously to complete the material lifting action.

[0044] The lifting mechanism 7 also includes a suction cup module, used to adsorb the bottom of the product when lifting it, preventing the product from slipping or shifting and improving the stability of the material handling process. The suction cup module includes a sealing ring 76, an air guide pipe 77, a connecting pipe 74, and a multi-port fitting 75. The air guide pipe 77 runs axially through both ends of the lifting rod 731, and the sealing ring 76 is located on the top of the first limiting plate 732, forming a suction cup structure. One end of the connecting pipe 74 is connected to the lower air passage of the lifting rod 731, and the other end is connected to the air passage of the multi-port fitting 75. The multi-port fitting 75 is also connected to the negative pressure air source in the electrical box 101. The negative pressure air source provides negative pressure adsorption force to the sealing ring 76 through the multi-port fitting 75, the connecting pipe 74, and the air guide pipe 77, so that the bottom of the product being tested is stably adsorbed when it is lifted, preventing it from slipping or shifting.

[0045] The low-voltage DC power supply module is integrated inside the electrical box 101 and is used to output a low-voltage DC test voltage to the power supply module under test, replacing the AC high-voltage input in traditional testing. The output terminal of the low-voltage DC power supply module is connected to the power supply module under test via the probe mechanism 5, so that the internal circuit functional test of the product under test can be completed under low-voltage DC input, which greatly reduces the risk of electric shock to operators, avoids arcing at the moment of connection, and reduces the damage to components of the product under test caused by high-voltage operation, and reduces the overall power consumption and size of the equipment.

[0046] The complete working process of this device is as follows:

[0047] 1. During the test preparation stage, first turn on the main power of the whole machine through the power switch, confirm that the emergency stop button 104 is in the reset state, and that the negative pressure air source and low voltage DC power module are in the standby state. Place the power module to be tested on the base body 201 of the positioning bottom mold 2, and complete the initial positioning through the cavity of the base body 201.

[0048] 2. During the downward pressure test, the operator pulls the anti-slip handle 442 axially to disengage the positioning protrusion 444 from the positioning groove 446, releasing the circumferential lock. Then, the anti-slip handle 442 is rotated circumferentially, causing the rotating sleeve 441 and the rotating shaft 41 to rotate synchronously. The rotating shaft 41 drives the drive gear 45 to rotate via the synchronous belt module 43. The drive gear 45 drives the lifting column 6 to move downwards vertically via the meshing lifting rack 47. The lifting column 6 simultaneously drives the top pressing mechanism 3 and the bottom pressure plate 72 to descend. During the descent of the pressure plate 72, first... The lifting spring 735 is compressed, and the lifting rod 731 remains stationary during this process, without interfering with the pressing action. Subsequently, the pressing rod 32 contacts the upper surface of the power module under test, and the buffer spring 204 is compressed and undergoes elastic deformation, forming a flexible clamping on the product under test. At the same time, the probe body 505 abuts against the corresponding test point of the product under test, forming a stable electrical connection. At this time, the anti-slip handle 442 is released, and the protective spring 443 pushes the anti-slip handle 442 to return to its axial position. The positioning protrusion 444 is engaged in the positioning groove 446 at the corresponding position, thereby locking the height of the lifting column 6.

[0049] 3. During the testing phase, the operator presses the on / off switch 105 to connect the test circuit. The low-voltage DC power supply module outputs the set low-voltage DC voltage, which is input to the voltage sampling circuit of the power supply module under test through the terminal 502, the adjusting resistor, and the probe body 505. By adjusting the resistance value of the adjusting resistor, the power supply module under test is successfully started and enters the working state under low-voltage input conditions. The test instrument 102 collects and displays the voltage, current, and other parameters of the test point in real time. The heat dissipation module 103 operates synchronously to maintain the stable operating temperature of the device.

[0050] 4. After the test is completed, disconnect the on / off switch 105 to cut off the test circuit, pull the anti-slip handle 442 axially again and rotate it circumferentially to drive the lifting column 6 to rise; the pressing mechanism 3 moves upward synchronously with the lifting column 6, and the probe body 505 and the pressing rod 32 separate from the surface of the product under test in sequence; at the same time, the pressure plate 72 rises with the lifting column 6, and first moves upward along the lifting rod 731 under the elastic force of the lifting spring 735 until the upper surface of the pressure plate 72 contacts the second limit plate 733, and then drives the lifting rod 731 to move upward synchronously; the sealing ring 76 at the top of the lifting rod 731 adsorbs the bottom of the product under test under the action of the negative pressure air source, and steadily lifts the product under test to the cavity above the base body 201. The adsorption state can effectively prevent the product from sliding or shifting during the lifting process; after the lifting column 6 rises to the initial upper limit position, release the anti-slip handle 442 to complete the position locking, and the operator can remove the product under test from the top of the lifting rod 731 to complete a single test cycle.

Claims

1. A low-voltage testing device for a power module, characterized in that: The device includes a mounting base, a positioning mold, a pressing mechanism, a control mechanism, a probe mechanism, a lifting column, a jacking mechanism, and a low-voltage DC power supply module. The positioning mold is located on the top surface of the mounting base and is used to place the power supply module under test. The lifting column is vertically and movably mounted on the mounting base. The pressing mechanism is fixedly connected to the upper part of the lifting column, and the probe mechanism is mounted on the pressing mechanism to form electrical contact with the test point of the power supply module under test when the pressing mechanism descends. The control mechanism is mounted on the mounting base and is drively connected to the lifting column, driving the lifting column to synchronously raise and lower the pressing mechanism and the jacking mechanism. The jacking mechanism is connected to the lower part of the lifting column and is used to lift the power supply module under test from the positioning mold when the lifting column rises. The low-voltage DC power supply module is located in the mounting base and is used to output a low-voltage DC test voltage to the power supply module under test.

2. The low-voltage testing device for power modules according to claim 1, characterized in that, The positioning base mold includes a base body and four sets of buffer modules; the base body has circular grooves at its four corners; each set of buffer modules includes a connecting column and a buffer spring, the bottom end of the connecting column is fixed to the mounting base, and the top end of the connecting column is correspondingly accommodated in the circular groove; the buffer spring is sleeved on the outside of the connecting column and elastically supported between the base body and the mounting base.

3. The low-voltage testing device for power modules according to claim 1, characterized in that, The pressing mechanism includes a pressing base plate and a base plate mounting module; the pressing base plate has an anti-interference groove, and a pressing rod is provided on the lower surface of the pressing base plate; the probe mechanism is assembled on the pressing base plate; the base plate mounting module includes a guide column, a linear bearing, a fastening knob, and a base lifting plate; the base lifting plate is fixedly connected to the top of the lifting column; the linear bearing is disposed on the base lifting plate, and the outer surface of the linear bearing is provided with an external thread; the side of the pressing base plate is provided with a positioning groove adapted to the outer surface of the linear bearing; the fastening knob cooperates with the external thread of the linear bearing, and by tightening the fastening knob, the pressing base plate can be clamped and fixed between the fastening knob and the base lifting plate.

4. The low-voltage testing device for power modules according to claim 3, characterized in that, The base lifting plate is provided with a permanent magnet, and the top of the pressing base plate is provided with a positioning iron plate corresponding to the position of the permanent magnet, which is used for pre-positioning when the pressing base plate is installed.

5. The low-voltage testing device for power modules according to claim 1, characterized in that, The control mechanism includes a rotating shaft, two bearing seats, a timing belt module, a handle module, a drive gear, a mounting plate, and a lifting rack. Both bearing seats are fixed to the mounting base, and the two ends of the rotating shaft are rotatably supported by the two bearing seats. The handle module is located at one end of the rotating shaft and is used to drive the rotating shaft to rotate around its own axis. The mounting plate is fixed to the mounting base, and the drive gear is rotatably mounted on the mounting plate. The two pulleys of the timing belt module are coaxially and fixedly connected to the rotating shaft and the drive gear, respectively. The lifting rack is fixed vertically to the side of the lifting column, and the drive gear meshes with the lifting rack.

6. The low-voltage testing device for power modules according to claim 5, characterized in that, The handle module includes a rotating sleeve, an anti-slip handle, a protective spring, and a positioning sleeve. The end surface of the rotating shaft has a flat portion. The rotating sleeve is fitted onto the end of the rotating shaft and is circumferentially fixed by screws against the flat portion. The anti-slip handle is located on the side of the rotating sleeve, can slide along the axial direction of the rotating shaft, and can drive the rotating sleeve to rotate synchronously with the rotating shaft. The side of the rotating sleeve has a positioning protrusion, and the side of the positioning sleeve has a positioning groove that matches the positioning protrusion. The protective spring is elastically connected between the rotating sleeve and the bearing seat on the corresponding side.

7. The low-voltage testing device for power modules according to claim 3, characterized in that, The probe mechanism includes an adjusting block, a terminal block, a fixing base, a fastening screw, a probe body, and an adjusting resistor. An adjusting hole is provided on the lower pressing base, and the adjusting block is equipped within the adjusting hole in an adjustable manner. The fixing base is fixed to the lower pressing base, and the fastening screw is threaded onto the side of the fixing base. The end of the fastening screw can be pressed tightly against the adjusting block to achieve positional fixation. The terminal block is located at the upper end of the adjusting block, and the probe body is located at the lower end of the adjusting block. The terminal block is electrically connected to the probe body via the adjusting resistor.

8. The low-voltage testing device for power modules according to claim 1, characterized in that, The lifting mechanism includes a connecting crossbar, a pressure plate, and four sets of lifting components. The middle part of the pressure plate is fixedly connected to the bottom end of the lifting column via the connecting crossbar. The four sets of lifting components are respectively arranged at the four corners of the pressure plate. Each set of lifting components includes a lifting rod, a first limiting plate, a second limiting plate, a third limiting plate, and a lifting spring. The first limiting plate is fixed to the top end of the lifting rod, and the third limiting plate is fixed to the bottom end of the lifting rod. The second limiting plate is fixed to the rod body of the lifting rod and is located between the pressure plate and the mounting base. The lifting spring is sleeved on the outside of the lifting rod and elastically supported between the pressure plate and the third limiting plate.

9. The low-voltage testing device for power modules according to claim 8, characterized in that, The lifting mechanism also includes a suction cup module; the suction cup module includes a sealing ring, an air guide pipe, a connecting pipe, and a multi-port fitting; the air guide pipe runs axially through both the upper and lower ends of the lifting rod; the sealing ring is located on the top of the first limiting plate; one end of the connecting pipe is connected to the lower air passage of the lifting rod, and the other end is connected to the air passage of the multi-port fitting; the multi-port fitting is also used to connect to an external negative pressure air source.

10. The low-voltage testing device for power modules according to claim 1, characterized in that, An electrical box is provided at the bottom of the mounting base, and a test instrument, a heat dissipation module, an emergency stop button, and an on / off switch are respectively provided on the top surface of the mounting base; an air source is provided inside the electrical box, and the air source is connected to the air circuit of the suction cup module.

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