Clamp device for testing power device

Abstract

The utility model relates to a clamp device for testing a power device, which comprises a toggle clamp mechanism arranged on testing equipment, a connecting seat mechanism is arranged at the end of the toggle clamp mechanism in a matched manner, and the connecting seat mechanism is hinged with a clamping mechanism through a connecting shaft. And the toggle clamp mechanism drives the workpiece to move to the working end of the test equipment through the clamping mechanism, so that the workpiece is tested through the test equipment. By arranging the toggle clamp mechanism, the clamping mechanism and the connecting seat mechanism, the stray inductance in the detection process of the single-tube power device can be reduced, and the detection accuracy is improved; and meanwhile, various types of workpieces can be compatible, the working stability is high, and the safety is high.

Description

Technical Field

[0001] This utility model relates to the field of fixture technology, and in particular to a fixture device for testing power devices. Background Technology

[0002] With the continuous development of technology in the field of power semiconductor testing, advanced techniques for accurately evaluating the dynamic performance of power semiconductors have emerged. Among these, double-pulse testing and short-circuit testing have become commonly used dynamic parameter testing methods. These testing methods are characterized by their ability to deeply reveal the performance of power semiconductor devices under transient conditions, which is crucial for ensuring the reliability and stability of devices in practical applications.

[0003] In related technologies, in order to perform dynamic parameter testing, an aging holder is usually used to fix the power device to the test equipment. The aging holder is soldered on the upper layer of the PCB board, thereby fixing and limiting the power device.

[0004] However, the aforementioned technologies suffer from several drawbacks. Due to the long pins of power devices, the aging sockets directly soldered onto the PCB board generate significant stray inductance, reducing the accuracy of double-pulse and short-circuit tests and leading to inaccurate test results. Furthermore, the fixed structure of the aging sockets prevents modification and makes them incompatible with single-tube power devices of various sizes, limiting the flexibility and applicability of the tests. In addition, existing testing equipment lacks heating and protection measures, posing potential safety hazards during the testing process and compromising personnel safety. Utility Model Content

[0005] To address the shortcomings of existing production technologies, the applicant provides a fixture device for testing power devices. By incorporating an elbow clamp mechanism, a gripping mechanism, and a connecting seat mechanism, it can reduce stray inductance during the testing of single-tube power devices and improve testing accuracy. Furthermore, it is compatible with various types of workpieces, exhibits high operational stability, and offers high safety.

[0006] The technical solution adopted in this utility model is as follows:

[0007] A clamping device for testing power devices includes an elbow clamping mechanism mounted on a testing device. A connecting seat mechanism is fitted to the end of the elbow clamping mechanism. The connecting seat mechanism is hinged to a clamping mechanism via a connecting shaft. The elbow clamping mechanism drives the workpiece to the working end of the testing device through the clamping mechanism, thereby allowing the testing device to test the workpiece.

[0008] As a further improvement to the above technical solution:

[0009] The clamping mechanism comprises a fixed plate, a heating plate attached to the top of the fixed plate for heating the fixed plate, and several square slots spaced apart on the bottom end face of the fixed plate, each square slot containing a workpiece. A limiting plate is installed at the center of the bottom of the fixed plate, and the limiting plate is in contact with the workpiece in the square slot, thereby preventing the workpiece from coming out of the corresponding square slot through the friction between the contact surfaces.

[0010] A first receiving groove and a second receiving groove are connected within a single square groove. The depth of the first receiving groove is greater than the depth of the second receiving groove, so that the injection-molded shell of the corresponding workpiece is accommodated through the first receiving groove, and the pins of the workpiece are accommodated through the second receiving groove.

[0011] A protrusion is provided in a single second receiving groove. The protrusion is located between two adjacent pins of the corresponding workpiece. The protrusion prevents the workpiece from coming out of the corresponding square groove by tightly engaging with the adjacent pin.

[0012] The heating plate has mounting holes and several mounting slots on its side end face. A heating rod is installed in the mounting hole and is electrically connected to an external power source. A temperature sensor is installed in each mounting slot. When the heating rod is energized, it generates heat, which raises the temperature of the heating plate and consequently raises the temperature of the fixing plate.

[0013] The elbow clamp mechanism has the following structure: it includes a base, which is hinged to a first connecting arm via a first hinge axis, the first connecting arm is hinged to a second connecting arm via a second hinge axis, the second connecting arm is hinged to a third connecting arm via a third hinge axis, and the third connecting arm is hinged to the base via a fourth hinge axis. By pushing and pulling the second connecting arm, the first connecting arm is driven to rotate around the first hinge axis, thereby driving the clamping mechanism to move.

[0014] The first connecting arm is provided with a connecting arm segment assembly, which includes two parallel and spaced connecting arm segments.

[0015] The end of the second connecting arm extends outward, which facilitates pushing and pulling the second connecting arm.

[0016] The structure of the connecting seat mechanism is as follows: it includes a connecting screw, and a first nut and a second nut are respectively installed on the outer circumferential surface of the connecting screw from top to bottom. A first washer is installed between the first nut and the top end face of the two connecting arm segments, and a second washer is installed between the second nut and the bottom end face of the two connecting arm segments. The connecting screw is locked between the two connecting arm segments by the first nut and the second nut. A connecting seat body is provided at the end of the connecting screw, and a connecting hole is opened on the connecting seat body.

[0017] Both the first gasket and the second gasket are provided with limit plate assemblies.

[0018] The beneficial effects of this utility model are as follows:

[0019] This utility model has a compact and reasonable structure and is easy to operate. By setting up an elbow clamp mechanism, a gripping mechanism and a connecting seat mechanism, the probe assembly can directly contact the pins of the single-tube power device, thereby shortening the power circuit distance, reducing stray inductance during the detection process and improving detection accuracy. At the same time, the fixture device has good compatibility, high working stability and high safety. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of this utility model.

[0021] Figure 2 for Figure 1 Exploded view.

[0022] Figure 3 This is a schematic diagram of the clamping mechanism in this utility model.

[0023] Figure 4 for Figure 3 Exploded view.

[0024] Figure 5 This is a schematic diagram of the clamping mechanism in this utility model when clamping a workpiece.

[0025] Figure 6 This is a schematic diagram of the connecting seat mechanism in this utility model.

[0026] Figure 7 This is a schematic diagram of the present invention in its working state.

[0027] The components include: 1. Elbow clamp mechanism; 2. Clamping mechanism; 3. Connecting seat mechanism; 4. Connecting shaft; 5. Test table; 6. Probe assembly; 7. Pin sleeve; 8. Workpiece;

[0028] 101. First connecting arm; 102. Second connecting arm; 103. Third connecting arm; 104. Base; 105. First hinge pin; 106. Second hinge pin; 107. Third hinge pin; 108. Fourth hinge pin;

[0029] 201. First receiving groove; 202. Second receiving groove; 203. Fixing plate; 204. Limiting plate; 205. Heating plate; 206. Heating rod; 207. Temperature sensor; 208. Positioning pin; 209. Protrusion;

[0030] 301. First nut; 302. Second nut; 303. Connecting screw; 304. First washer; 305. Second washer; 306. Limiting plate assembly; 307. Connecting seat; 308. Connecting hole. Detailed Implementation

[0031] The specific embodiments of this utility model are described below with reference to the accompanying drawings.

[0032] The structure and function of this utility model are as follows:

[0033] like Figures 1-7 As shown, a clamping device for testing power devices includes an elbow clamping mechanism 1 mounted on a testing device. A connecting seat mechanism 3 is fitted to the end of the elbow clamping mechanism 1. The connecting seat mechanism 3 is hinged to a clamping mechanism 2 via a connecting shaft 4. The elbow clamping mechanism 1, through the clamping mechanism 2, moves the workpiece 8 to the working end of the testing device, thereby allowing the testing device to test the workpiece 8. This invention, by setting the elbow clamping mechanism 1 and the clamping mechanism 2, enables the probe assembly 6 to directly contact the pins of the workpiece 8, thereby shortening the power circuit distance, reducing stray inductance during the testing process, and improving testing accuracy.

[0034] The fixture device is installed in an open area on top of the testing equipment. The testing equipment includes a test platform 5, on which a circuit board module is mounted. A probe assembly 6 is soldered onto the circuit board module. A square through hole is opened on the end face of the test platform 5. The shape of the square through hole corresponds to the shape of the clamping mechanism 2, thus forming a test working position at the square through hole. The probe assembly 6 is arranged in the square through hole. The probe assembly 6 includes several probes, which correspond to the pins of the workpiece 8 and can abut against different pins to realize the electrical connection between the testing equipment and the workpiece 8, thereby facilitating the testing of the performance of the workpiece 8. The workpiece 8 is tested in the test working position, which facilitates the direct contact between the probe assembly 6 and the pins, thereby shortening the power loop distance, reducing noise in the testing process, and improving the testing accuracy.

[0035] Two pin sleeves 7 are installed on the test bench 5. The two pin sleeves 7 are symmetrically arranged on both sides of the square through hole. A pin hole is opened on the top of each pin sleeve 7. The pin hole corresponds one-to-one with the positioning pin 208. The positioning pin 208 is fixed on the heating plate 205 of the clamping mechanism 2. By inserting the positioning pin 208 into the corresponding pin hole, the clamping mechanism 2 is positioned, so that the clamping mechanism 2 can enter the square through hole to achieve the engagement of the clamping mechanism 2 with the test work position.

[0036] The clamping device includes an elbow clamping mechanism 1, a clamping mechanism 2, a connecting seat mechanism 3, and a connecting shaft 4;

[0037] The elbow clamp mechanism 1 can rotate from 0 to 96°, thus facilitating the placement of the clamping mechanism 2 into the test work position, or moving the clamping mechanism 2 away from the test work position; for example... Figures 1-2As shown, the elbow clamping mechanism 1 has the following structure: it includes a base 104, which is hinged to a first connecting arm 101 via a first hinge pin 105. The first connecting arm 101 is hinged to a second connecting arm 102 via a second hinge pin 106. The second connecting arm 102 is hinged to a third connecting arm 103 via a third hinge pin 107. The third connecting arm 103 is hinged to the base 104 via a fourth hinge pin 108. By pushing and pulling the second connecting arm 102, the first connecting arm 101 is driven to rotate around the first hinge pin 105, thereby driving the clamping mechanism 2 to move.

[0038] The first connecting arm 101 is provided with a connecting arm segment assembly, which includes two parallel and spaced connecting arm segments. A connecting seat mechanism 3 is installed between the two connecting arm segments, and the elbow clamping mechanism 1 is installed in conjunction with the clamping mechanism 2 through the connecting seat mechanism 3.

[0039] The end of the second connecting arm 102 extends outward, making it easier to push and pull the second connecting arm 102. By pushing and pulling the second connecting arm 102, the operator can cause the first connecting arm 101 to rotate around the first hinge axis 105.

[0040] like Figures 3-5 As shown, the clamping mechanism 2 has the following structure: it includes a fixing plate 203, a heating plate 205 is attached to the top of the fixing plate 203 for heating the fixing plate 203, and several square slots are spaced apart on the bottom end face of the fixing plate 203. Each square slot contains a workpiece 8. A limiting plate 204 is installed in the center of the bottom of the fixing plate 203. The limiting plate 204 is in contact with the workpiece 8 in the square slot, thereby preventing the workpiece 8 from coming out of the corresponding square slot through the friction between the contact surfaces. During the testing process, single-tube power devices may be damaged or even explode. In this invention, the fixing plate 203 is made of high-strength insulating material. Combined with the testing position, it can surround the single-tube power device, ensuring that the testing position of the workpiece 8 is submerged in the testing equipment, thus more effectively absorbing energy and improving the safety of the testing process.

[0041] A first receiving groove 201 and a second receiving groove 202 are connected and arranged in a single square groove. The depth of the first receiving groove 201 is greater than the depth of the second receiving groove 202, so that the injection-molded shell of the corresponding workpiece 8 is accommodated through the first receiving groove 201, and the pins of the workpiece 8 are accommodated through the second receiving groove 202.

[0042] A protrusion 209 is provided in a single second receiving groove 202. The protrusion 209 is located between two adjacent pins of the corresponding workpiece 8. The protrusion 209 prevents the workpiece 8 from coming out of the corresponding square groove by tightly engaging with the adjacent pin.

[0043] The heating plate 205 has mounting holes and several mounting slots on its side surface. A heating rod 206 is installed in each mounting hole and is electrically connected to an external power source. A temperature sensor 207 is installed in each mounting slot. When the heating rod 206 is energized, it generates heat, causing the temperature of the heating plate 205 to rise, which in turn raises the temperature of the fixing plate 203. By incorporating the temperature sensor 207 and heating rod 206, the heating plate 205 can achieve temperature variations within a range from room temperature to 200°C. The energization of the heating rod 206 ensures uniform heating of the heating plate 205. The temperature sensor 207 is electrically connected to an external controller, which controls the heating temperature of the heating rod 206 based on the real-time temperature feedback from the temperature sensor 207, thus enabling real-time monitoring and rapid compensation of the heating plate 205's temperature.

[0044] Furthermore, since the design standard for single-tube power devices only specifies the center distance between device pins and does not have specific requirements for other dimensions, this utility model determines the bottom arrangement position of each probe in the probe assembly 6 by the center distance of the device pins. Thus, when the housing size of the single-tube power device changes, it is only necessary to remove the screws and replace the fixing plate 203 to complete the quick replacement. It can match different types of single-tube power devices and improve the compatibility of the clamping device.

[0045] The connecting seat mechanism 3 has the following structure: it includes a connecting screw 303, with a first nut 301 and a second nut 302 respectively fitted on the outer circumference of the connecting screw 303 from top to bottom. A first washer 304 is fitted between the first nut 301 and the top end face of the two connecting arm segments, and a second washer 305 is fitted between the second nut 302 and the bottom end face of the two connecting arm segments. The connecting screw 303 is locked between the two connecting arm segments by the first nut 301 and the second nut 302. A connecting seat body 307 is provided at the end of the connecting screw 303, and a connecting hole 308 is provided on the connecting seat body 307. Limiting plate assemblies 306 are provided on both the first washer 304 and the second washer 305. By setting the connecting screw 303, the vertical distance between the clamping mechanism 2 and the first connecting arm 101 can be adjusted, thereby allowing for a small range of adjustment of the distance between the workpiece 8 located on the clamping mechanism 2 and the probe assembly 6, avoiding excessive interaction force between the two and causing damage.

[0046] By setting the connecting shaft 4, the connecting screw 303 and the clamping mechanism 2 are hinged, so that the clamping mechanism 2 can rotate relative to the connecting screw 303, thereby ensuring that the bottom end face of the clamping mechanism 2 is always parallel to the top end face of the test platform 5.

[0047] The working process of this utility model is as follows:

[0048] Insert the workpiece 8 into the square groove at the bottom of the fixing plate 203, ensuring that the limiting plate 204 is in close contact with the injection-molded shell of the workpiece 8. At the same time, two of the pins of the workpiece 8 are in close contact with the outer wall of the protrusion 209.

[0049] The operator pushes the second connecting arm 102, causing the first connecting arm 101 to rotate around the first hinge axis 105. This, in turn, drives the clamping mechanism 2 to move within a certain spatial range through the connecting seat mechanism 3, until the positioning pins 208 on the clamping mechanism 2 are inserted into the corresponding pin holes. This indicates that the clamping mechanism 2 has moved into place, the fixing plate 203 has engaged with the test work position, the probe assembly 6 abuts against multiple pins in the workpiece 8, and then the test equipment is powered on to start the test.

[0050] After the test is completed, the operator pulls the second connecting arm 102, which drives the clamping mechanism 2 away from the test position through the first connecting arm 101. Finally, the workpiece 8 on the clamping mechanism 2 is removed, thus completing the test.

[0051] The above description is an explanation of the present utility model and not a limitation thereof. The scope of the present utility model is defined by the claims. Within the protection scope of the present utility model, any form of modification may be made.

Claims

1. A fixture apparatus for testing power devices, characterized by: The elbow clamping mechanism (1) is installed on the test equipment, the end of the elbow clamping mechanism (1) is matched with the connecting seat mechanism (3), the connecting seat mechanism (3) is hinged with the clamping mechanism (2) through the connecting shaft (4), the elbow clamping mechanism (1) drives the workpiece (8) to move to the working end of the test equipment through the clamping mechanism (2), so that the test equipment tests the workpiece (8).

2. A fixture apparatus for testing a power device as recited in claim 1, wherein: The structure of the clamping mechanism (2) comprises a fixed plate (203), a heating plate (205) is matched and installed on the top of the fixed plate (203), the heating plate (205) is used for heating the fixed plate (203), a plurality of square grooves are arranged on the bottom end face of the fixed plate (203), a single square groove contains a workpiece (8), a limiting plate (204) is matched and installed on the bottom center of the fixed plate (203), the limiting plate (204) is in contact with the workpiece (8) in the square groove at the same time, so that the workpiece (8) is prevented from being taken out of the corresponding square groove through the friction between the contact surfaces.

3. A fixture apparatus for testing a power device as defined in claim 2, wherein: A first accommodating groove (201) and a second accommodating groove (202) are arranged in a single square groove, the depth of the first accommodating groove (201) is greater than the depth of the second accommodating groove (202), so that the injection shell of the corresponding workpiece (8) is accommodated in the first accommodating groove (201), and the pin of the workpiece (8) is accommodated in the second accommodating groove (202).

4. A fixture apparatus for testing a power device as recited in claim 3, wherein: A protrusion (209) is arranged in a single second accommodating groove (202), the protrusion (209) is located between two adjacent pins of the corresponding workpiece (8), and the protrusion (209) is tightly matched with the adjacent pin, so that the workpiece (8) is prevented from being taken out of the corresponding square groove.

5. The fixture apparatus for testing a power device of claim 2, wherein: A mounting hole and a plurality of mounting grooves are formed in the side end face of the heating plate (205), a heating rod (206) is matched and installed in the mounting hole, the heating rod (206) is electrically connected with an external power supply, a temperature sensor (207) is matched and installed in a single mounting groove, the heating rod (206) is electrified to generate heat, so that the temperature of the heating plate (205) is increased, and then the temperature of the fixed plate (203) is increased.

6. The fixture apparatus of claim 1, wherein: The structure of the elbow clamping mechanism (1) comprises a base (104), the base (104) is hinged with a first connecting arm (101) through a first hinge shaft (105), the first connecting arm (101) is hinged with a second connecting arm (102) through a second hinge shaft (106), the second connecting arm (102) is hinged with a third connecting arm (103) through a third hinge shaft (107), and the third connecting arm (103) is hinged with the base (104) through a fourth hinge shaft (108), by pushing and pulling the second connecting arm (102), the first connecting arm (101) is driven to rotate around the first hinge shaft (105), and then the clamping mechanism (2) is moved.

7. A fixture apparatus for testing a power device as defined in claim 6, wherein: The first connecting arm (101) is provided with a connecting arm segmented assembly, the connecting arm segmented assembly comprises two parallel and spaced connecting arm segments.

8. The fixture apparatus for testing a power device of claim 6, wherein: The end of the second connecting arm (102) extends outward, so as to facilitate pushing and pulling the second connecting arm (102).

9. The fixture apparatus of claim 1, wherein: The connecting seat mechanism (3) is structured as follows: a connecting screw rod (303) is provided with a first nut (301) and a second nut (302) fitted and installed on the outer circumferential surface from top to bottom, a first gasket (304) is fitted and installed between the first nut (301) and the top end surface of the two connecting arm sections, a second gasket (305) is fitted and installed between the second nut (302) and the bottom end surface of the two connecting arm sections, the connecting screw rod (303) is locked between the two connecting arm sections by the first nut (301) and the second nut (302), and the end of the connecting screw rod (303) is provided with a connecting seat body (307), and a connecting hole (308) is formed in the connecting seat body (307).

10. A fixture apparatus for testing a power device as defined in claim 9, wherein: The first gasket (304) and the second gasket (305) are both provided with a limiting sheet assembly (306).

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