1. An apparatus for testing an IGBT, characterized in that: the cooling device comprises a box body, a first cooling mechanism, a second cooling mechanism, a control module and a power supply, wherein the first cooling mechanism, the second cooling mechanism, the control module and the power supply are arranged in the box body; the first cooling mechanism comprises a water-cooled cabinet, a first cross bar, a first support and a first sliding piece, the first support is used for mounting the IGBT to be tested, the first cross bar is horizontally fixed on one side of the water-cooled cabinet, the first support is in sliding connection with the water-cooled cabinet through the first cross bar, and the first sliding piece is arranged at the upper end of the first support; the second cooling mechanism comprises an oil cooler, an oil pipe and an oil temperature controller, wherein the oil cooler is used for cooling the IGBT to be tested, the oil temperature controller is electrically connected with the control module, the oil temperature controller comprises an oil storage tank, and the oil storage tank passes through the oil pipe and the oil cooler.

2. The apparatus for testing an IGBT according to claim 1, wherein: the control module comprises a control mainboard, an information driving board and a power supply connecting board used for outputting test current, wherein the power supply connecting board is electrically connected with the control mainboard through the information driving board, and the information driving board is electrically connected with the power supply.

3. The apparatus for testing an IGBT according to claim 2, wherein: the first cooling mechanism further comprises a water temperature controller and a steel pipe, the water temperature controller is electrically connected with the control main board, and the water temperature controller is communicated with the water cooling cabinet through the steel pipe.

4. The apparatus for testing an IGBT according to claim 3, wherein: the steel pipe is provided with a control valve and a flowmeter, the control valve is electrically connected with the control main board, and the oil pipe is provided with a heat insulation layer.

5. The apparatus for testing an IGBT according to claim 4, characterized in that: the test current is 10 mA-600A.

6. The apparatus for testing an IGBT according to claim 1, wherein: the second cooling mechanism further comprises a second transverse bar, a second support and a second sliding piece, wherein the second support is used for installing the IGBT to be tested, the second transverse bar is horizontally fixed on one side of the oil refrigerator, the second support passes through the second transverse bar and the oil refrigerator in sliding connection, and the second sliding piece is arranged at the upper end of the second support.

7. The apparatus for testing an IGBT according to claim 6, wherein: first cooling body with second cooling structure all includes temperature sensor and leveling plate, temperature sensor sets up on the leveling plate, the last leveling plate of first cooling body set up in the upper surface of water-cooling cabinet, the last leveling plate of second cooling body set up in the upper surface of oil freezer, temperature sensor with control mainboard electric connection.

8. The apparatus for testing an IGBT according to claim 7, wherein: the first support comprises a first stabilizing groove, the first sliding part is connected with the first support in a sliding mode through the first stabilizing groove, the second cooling mechanism comprises a second stabilizing groove, and the second sliding part is connected with the second support in a sliding mode through the second stabilizing groove.

9. The apparatus for testing an IGBT according to claim 2, wherein: the power supply comprises a first power supply and a second power supply, and the first power supply and the second power supply are electrically connected with the information driving board respectively.

10. The apparatus for testing an IGBT according to claim 9, wherein: the power fishplate bar is including being used for with the IGBT electric connection's that awaits measuring wiring copper and signal interface, the wiring copper with second power electric connection, signal interface with information drive plate signal connection.

Background

The IGBT is a compound fully-controlled voltage-driven power semiconductor device composed of BJT (bipolar transistor) and MOS (insulated gate field effect transistor), has the advantages of both high input impedance of MOSFET and low on-state voltage drop of GTR, and is applied to electronic circuits, and is usually tested when the IGBT is used.

When testing the IGBT, the performance of the IGBT is usually determined according to the junction temperature of the IGBT to be tested, and the junction temperature is related to the ambient temperature Ta of the IGBT package.

Because the ambient temperature of the IGBT package is susceptible to the heat generated by the electronic device, the package ambient temperature range set by a general IGBT test apparatus is limited, and the IGBT cannot be tested well by junction temperature.

Disclosure of Invention

In order to overcome the defects of the prior art, the invention aims to provide a device for testing the IGBT, which has a large environment temperature range for arranging the IGBT package and can well test the IGBT through junction temperature.

The purpose of the invention is realized by adopting the following technical scheme:

a device for testing an IGBT comprises a box body, a first cooling mechanism, a second cooling mechanism, a control module and a power supply, wherein the first cooling mechanism, the second cooling mechanism, the control module and the power supply are arranged in the box body;

the first cooling mechanism comprises a water-cooled cabinet, a first cross bar, a first support and a first sliding piece, the first support is used for mounting the IGBT to be tested, the first cross bar is horizontally fixed on one side of the water-cooled cabinet, the first support is in sliding connection with the water-cooled cabinet through the first cross bar, and the first sliding piece is arranged at the upper end of the first support;

the second cooling mechanism comprises an oil cooler, an oil pipe and an oil temperature controller, wherein the oil cooler is used for cooling the IGBT to be tested, the oil temperature controller is electrically connected with the control module, the oil temperature controller comprises an oil storage tank, and the oil storage tank passes through the oil pipe and the oil cooler.

Preferably, the control module includes a control mainboard, an information drive board and a power supply connection board for outputting a test current, the power supply connection board is electrically connected with the control mainboard through the information drive board, and the information drive board is electrically connected with the power supply.

Preferably, the first cooling mechanism further comprises a water temperature controller and a steel pipe, the water temperature controller is electrically connected with the control main board, and the water temperature controller is communicated with the water cooling cabinet through the steel pipe.

Preferably, the steel pipe is provided with a control valve and a flowmeter, the control valve is electrically connected with the control main board, and the oil pipe is provided with a heat insulation layer.

Preferably, the test current is a current of 10 mA-600A.

Preferably, the second cooling mechanism further comprises a second transverse bar, a second support and a second sliding piece, wherein the second support is used for installing the IGBT to be tested, the second transverse bar is horizontally fixed on one side of the oil refrigerator, the second support passes through the second transverse bar and the oil refrigerator in sliding connection, and the second sliding piece is arranged at the upper end of the second support.

Preferably, first cooling body with second cooling structure all includes temperature sensor and leveling plate, temperature sensor sets up on the leveling plate, the last leveling plate setting of first cooling body is in the upper surface of water-cooling cabinet, the last leveling plate setting of second cooling body is in the upper surface of oil freezer, temperature sensor with control mainboard electric connection.

Preferably, the first bracket includes a first stabilizing groove through which the first sliding member is slidably connected to the first bracket, and the second cooling mechanism includes a second stabilizing groove through which the second sliding member is slidably connected to the second bracket.

Preferably, the power supply comprises a first power supply and a second power supply, and the first power supply and the second power supply are respectively and electrically connected with the information driving board.

Preferably, the power connection board comprises a wiring copper plate and a signal interface, the wiring copper plate is electrically connected with the second power supply, and the signal interface is in signal connection with the information driving board.

Compared with the prior art, the invention has the beneficial effects that:

the device for testing the IGBT is provided with the first cooling mechanism and the second cooling mechanism, the junction temperature of the IGBT to be tested can be changed through the water cooling cabinet in the first cooling mechanism, the junction temperature of the IGBT to be tested can also be changed through the oil cooling cabinet in the second cooling mechanism, the oil cooling cabinet can reduce the packaged environment temperature to be below 0 ℃ and be increased to be above 100 ℃, the packaged environment temperature range of the IGBT is expanded, and the performance of the IGBT can be well tested through the junction temperature.

Drawings

Fig. 1 is a schematic perspective view of an apparatus for testing an IGBT according to the present invention;

FIG. 2 is a schematic perspective view of the IGBT testing device of the present invention with the glass cover removed and the oil temperature controller;

FIG. 3 is a schematic perspective view of a portion of the IGBT testing device of the present invention;

FIG. 4 is an enlarged schematic view of the structure at A in FIG. 3;

FIG. 5 is a schematic plan view of a portion of the apparatus for testing IGBTs of the present invention;

fig. 6 is an enlarged schematic view of the structure at B in fig. 5.

In the figure: 100. means for testing the IGBT; 10. a box body; 11. a trapezoidal cabinet; 111. a glass cover; 112. a frame; 113. a switch plate; 114. a telescopic rod; 12. a display screen; 121. a support arm; 13. an alarm; 14. a cabinet door; 141. a heat dissipation air port; 20. a first cooling mechanism; 21. a water-cooled cabinet; 22. a first cross bar; 23. a first bracket; 231. a first stabilizing slot; 24. a first slider; 25. leveling the plate; 26. a steel pipe; 261. a control valve; 262. a flow meter; 30. a second cooling mechanism; 31. an oil refrigerator; 311. a second cross bar; 32. an oil temperature controller; 33. an oil pipe; 331. an oil inlet pipe; 332. an oil outlet pipe; 34. a second bracket; 35. a heat sink; 36. a first fan; 40. a control module; 41. a power supply connecting plate; 411. a signal interface; 42. a wiring copper plate; 43. a control main board; 44. an information driving board; 45. a second fan; 50. a power source; 51. a first power supply; 52. a second power supply; 53. an air switch; 54. and a third fan.

Detailed Description

So that the manner in which the features and advantages of the invention are attained and can be understood in detail, a more particular description of the invention, briefly summarized above, may be had by reference to the embodiments thereof which are illustrated in the appended drawings.

In the description of the present invention, it should be noted that the terms "upper", "lower", "left", "right", "lateral", "longitudinal", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or orientations or positional relationships that the products of the present invention are conventionally placed in use, and are used for convenience of description and simplicity of description only, and do not indicate or imply that the devices or elements indicated must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.

As shown in fig. 1 to 4, an apparatus 100 for testing an IGBT disclosed in the present application includes a case 10, and a first cooling mechanism 20, a second cooling mechanism 30, a control module 40, and a power supply 50 disposed in the case 10, where the second cooling mechanism 30 and the power supply 50 are both electrically connected to the control module 40; the first cooling mechanism 20 comprises a water-cooled cabinet 21, a first cross bar 22, a first support 23 for mounting an IGBT to be tested and a first sliding part 24, the first cross bar 22 is horizontally fixed on one side of the water-cooled cabinet 21, the first support 23 is slidably connected with the water-cooled cabinet 21 through the first cross bar 22, and the upper end of the first support 23 is provided with the first sliding part 24; second cooling body 30 is including the oil cooling cabinet 31, oil pipe 33 and the oil temperature controller 32 that are used for cooling the IGBT that awaits measuring, oil temperature controller 32 with control module 43 electric connection, oil temperature controller 32 includes the oil storage tank, the oil storage tank pass through oil pipe 33 with oil freezer 31 intercommunication.

In the above embodiment, firstly, the IGBT to be tested is placed on the upper surface of the water-cooled cabinet 21, the IGBT to be tested is downwardly supported by the first sliding part 24 on the first support 23, the first sliding part 24 is fixed by screws to fix the IGBT to be tested, then a high current (generally about 500A) is applied to the IGBT to be tested by the control module 40 and the power supply 50, so that when the IGBT to be tested is heated to a certain temperature, a weak current (about tens of milliamperes) is changed to the IGBT to be tested (the temperature is not easily raised), and then the water-cooled cabinet 21 in the first cooling mechanism 20 is used for cooling the IGBT to be tested, so as to change the junction temperature of the IGBT to be tested; the IGBT to be tested can be arranged on the oil refrigerator 31, the temperature of oil can be reduced to be below 0 ℃ or above 100 ℃, the environment temperature range of IGBT packaging can be expanded, and the IGBT can be well tested by changing junction temperature.

The first bracket 23 can move laterally on the water-cooled cabinet 21 through the first cross bar 22, and the first sliding member 24 can move longitudinally on the first bracket 23, so that the position of the first sliding member 24 can be well adjusted, and the IGBT to be tested is more convenient to stabilize. In order to stabilize the IGBT to be tested, a plurality of first brackets 23 may be disposed on the water-cooled cabinet 21, and a plurality of first sliding members 24 may be disposed on the first brackets 23. The oil in the oil cooler 31 may be vegetable oil.

In a preferred embodiment, as shown in fig. 1 to 3, the box 10 further includes a trapezoidal cabinet 11, the first cooling mechanism 20, the second cooling mechanism 30 and the control module 40 are all disposed in the trapezoidal cabinet 11, and a glass cover 111 is disposed on the trapezoidal cabinet 11. The glass cover 111 is rotatably connected with the trapezoidal cabinet 11 through a frame 112, and the frame 112 is rotatably connected with the trapezoidal cabinet 11 through an expansion link 114. Still be provided with switch panel 113, alarm 13 and display screen 12 on the trapezoidal cabinet 11, switch panel 113, alarm 13 and display screen 12 equally divide respectively with control module 40 electric connection.

In the above embodiment, glass cover 111 does benefit to the observation test condition, also does benefit to the heating IGBT that awaits measuring, telescopic link 114 does benefit to and opens glass cover 111, display screen 12 can be the touch-sensitive screen, display screen 12 pass through support arm 121 with box 10 rotates and connects, display screen 12 can show test information. The alarm 13 can warn danger, and the switch board 113 is provided with a start-stop switch, a pause switch, an adjusting switch and the like. The box body 10 is further provided with a cabinet door 14, and the lower end of the cabinet door 14 is further provided with a heat dissipation air port 141.

In a preferred embodiment, as shown in fig. 2 to 6, the first cooling mechanism 20 further includes a water temperature controller (not shown) and a steel pipe 26, the water temperature controller is electrically connected to the control main board 43, and the water temperature controller is communicated with the water cooling cabinet 21 through the steel pipe 26. The steel pipe 26 is provided with a control valve 261 and a flow meter 262, and the control valve 261 is electrically connected with the control main board 43. The first cooling mechanism 20 and the second cooling mechanism 30 each include a temperature sensor (not shown) and a leveling plate 25, the temperature sensor is disposed on the leveling plate 25, the leveling plate 25 on the first cooling mechanism 20 is disposed on the upper surface of the water cooling cabinet 21, the first bracket 23 includes a first stabilizing groove 231, and the first slider 24 is slidably connected to the first bracket 23 through the first stabilizing groove 231.

In the above embodiment, the water temperature controller is provided with a water tank, a water pump and a refrigerator, the water pump can make water form a circulation flow to reduce heat better, and the refrigerator can also supply water to reduce temperature. The control valve 261 can control water flow, the flow meter 262 can read the water flow, and heat can be dissipated to the steel pipe 26, the control valve 261 and the circuit through the radiator 35. The leveling plate 25 is beneficial to placing the IGBT to be tested, the leveling plate 25 is optimally a steel plate beneficial to heat dissipation, the temperature sensor can read the temperature on the IGBT to be tested, and the first sliding part 24 slides in the first stabilizing groove 231.

As shown in fig. 2 to 6, in a preferred embodiment, the second cooling mechanism 30 further includes a second cross bar 311, a second bracket 34 for mounting the IGBT to be tested, and a second slider (not shown), the second cross bar 311 is horizontally fixed on one side of the oil cooler 31, the second bracket 34 is slidably connected to the oil cooler 31 through the second cross bar 311, and a second slider is disposed at an upper end of the second bracket 34. The leveling plate 25 on the second cooling mechanism 30 is arranged on the upper surface of the oil refrigerator 31, and the temperature sensor is electrically connected with the control main board 43. The second cooling mechanism 30 includes a second stabilizing slot (not shown) through which the second slider is slidably coupled to the second bracket 34. The oil pipe 33 is provided with an insulating layer (not shown).

In the above embodiment, the lower end of the second bracket 34 is provided with a fastening groove, the second cross bar 311 is slidably connected with the second bracket 34 through the fastening groove, and the second bracket 34 has the same function as the first bracket 23. Since the temperature of the oil may be higher than 100 degrees or lower than 0 degrees, so as to prevent scalding, an insulating layer is provided on the oil pipe 33. The oil pipe 33 is provided with two, one is an oil inlet pipe 331, and the other is an oil outlet pipe 332.

In a preferred embodiment, as shown in fig. 5-6, the control module 40 includes a control main board 43, an information driving board 44, and a power supply board 41 for outputting a test current, wherein the power supply board 41 is electrically connected to the control main board 43 through the information driving board 44, and the information driving board 44 is electrically connected to the power supply 50. The test current is 10 mA-600A. The power supply 50 includes a first power supply 51 and a second power supply 52, and the first power supply 51 and the second power supply 52 are electrically connected to the information driving board 44, respectively.

In the above embodiment, the control main board 43 is provided with an MCU or a single chip microcomputer, which can output or input a test command from outside, the information driving board 44 can convert the test command into a test signal, the power connection board 41 includes a wiring copper board 42 electrically connected to the IGBT to be tested and a signal interface 411, the wiring copper board 42 is electrically connected to the second power supply, and the signal interface 411 is in signal connection with the information driving board 44. The first power supply 51 is a weak current power supply and can output low-current power, and mainly transmits power to the control module 40 and outputs low voltage to the IGBT to be tested; the second power source 52 is a strong power source capable of outputting high current power, and can be electrically connected to the commercial power and output high current to the IGBT to be tested. To protect the circuit, an air switch 53 is provided on the power supply 50. The wiring copper plate 42 is beneficial to transmitting high current (50A-600A), and the wiring copper plate 42 is electrically connected with the IGBT to be tested through a thick lead; the signal interface 411 can output weak current (10 mA-50A), a test signal and a feedback test signal, and the signal interface 411 can be connected with an IGBT signal to be tested through a signal line. The power supply connecting plate 41 can dissipate heat through the first fan 36, the information driving plate 44 can dissipate heat through the second fan 45, and the power supply 50 can dissipate heat through the third fan 54.

In summary, the device 100 for testing the IGBT has the advantages that the water cooling cabinet 21 and the oil cooling cabinet 31 are arranged, so that the ambient temperature of the IGBT package to be tested is in a larger range, the junction temperature range of the IGBT is expanded, and the performance of the IGBT can be tested through the junction temperature.

The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are given by way of illustration of the principles of the present invention, and that various changes and modifications may be made without departing from the spirit and scope of the invention as defined by the appended claims. The scope of the invention is defined by the appended claims and equivalents thereof.