Detection circuit board and detection equipment of IGBT device

Abstract

The utility model discloses a detection circuit board and detection equipment of an IGBT device, the detection circuit board comprises a voltage stabilizing circuit, an IGBT device connecting seat and a driving circuit, the voltage stabilizing circuit comprises a test voltage input end and a capacitor module, and the capacitor module is connected with a positive electrode and a negative electrode of the test voltage input end; a first connecting end of the IGBT device connecting seat is connected with one end of the capacitor module through the sampling resistor, a second connecting end is connected with the other end of the capacitor module, and a third connecting end is used for connecting a control pin of an IGBT device to be tested; the IGBT device is provided with break-over voltage through the driving circuit, the capacitor is used for charging energy, the voltage at the two ends of the IGBT device can be accurately controlled, then the IGBT device is conducted to carry out short circuit tolerance measurement after the whole detection circuit is stable, the test accuracy can be improved, in addition, the IGBT device to be tested is detachably installed, and the test efficiency is improved. Therefore, the circuit board can be repeatedly used for multiple short circuit tolerance tests.

Description

Technical Field

[0001] The present application relates to the field of electronic circuit technology, and in particular to a detection circuit board and detection equipment for an IGBT device. Background Art

[0002] With the development of air conditioner technology, the use of IGBT devices in air conditioner control boards is also increasing. If an IGBT device fails, it will cause control problems in the entire control board. In order to avoid the failure of IGBT devices due to excessive operating current of the air conditioner, IGBT devices with large short-circuit tolerance should be selected. Short-circuit tolerance refers to the time that the IGBT device is turned on in a short-circuit state and can withstand large current without being damaged. In order to improve the reliability of air conditioners, manufacturers need to test the short-circuit tolerance of IGBT devices.

[0003] At present, the short-circuit withstand test of IGBT devices usually uses a power supply to directly provide a large current to the IGBT device and measure the current flowing through the IGBT device. In fact, the power-on time of the power supply is difficult to control, the test is not precise enough, and usually a temporary circuit is built for testing without relevant detection equipment, all of which affect the accuracy of the measurement. Utility Model Content

[0004] The embodiments of the present application provide a detection circuit board and detection equipment for an IGBT device, and provide a platform for performing short-circuit withstand testing on the IGBT device.

[0005] In a first aspect, an embodiment of the present application provides a detection circuit board for an IGBT device, comprising:

[0006] A voltage stabilizing circuit, comprising a test voltage input terminal and a capacitor module, wherein the capacitor module is connected to a positive electrode and a negative electrode of the test voltage input terminal;

[0007] An IGBT device connection socket, used for detachably mounting an IGBT device to be tested, the IGBT device connection socket comprising a first connection end, a second connection end and a third connection end, the first connection end being connected to one end of the capacitor module through a sampling resistor, the second connection end being connected to the other end of the capacitor module, and the third connection end being used for connecting a control pin of the IGBT device to be tested;

[0008] A drive circuit, wherein a voltage output terminal of the drive circuit is connected to the third connection terminal, and is used to provide a conduction voltage to the IGBT device to be tested.

[0009] In some embodiments, the capacitor module includes at least two parallel capacitor branches, and the capacitor branch is composed of multiple capacitors connected in series.

[0010] In some embodiments, a protection circuit is further included, wherein the protection circuit includes a voltage stabilizing device, wherein a negative electrode of the voltage stabilizing device is connected to the third terminal, and a positive electrode of the voltage stabilizing device is grounded.

[0011] In some embodiments, the protection circuit further includes a voltage divider circuit, one end of the voltage divider circuit is connected to the voltage output end of the drive circuit, the other end of the voltage divider circuit is grounded, and the voltage dividing point of the voltage divider circuit is connected to the third connection end.

[0012] In some embodiments, it also includes:

[0013] The first area is used to install the capacitor module;

[0014] The second area is used to install the IGBT device connection socket, the drive circuit and the sampling resistor;

[0015] The first area and the second area are arranged side by side on the detection circuit board.

[0016] In some embodiments, it also includes a first terminal, a second terminal, a third terminal, a fourth terminal, a fifth terminal and a sixth terminal; the first terminal is used to connect the positive pole of the test voltage input terminal, the second terminal is used to connect the negative pole of the test voltage input terminal, the third terminal and the fourth terminal are used to connect the ground wire, the fifth terminal is used to connect the power supply terminal of the drive circuit, and the sixth terminal is used to connect the signal input terminal of the drive circuit.

[0017] In some embodiments, the first terminal, the second terminal, the third terminal, the fourth terminal, the fifth terminal and the sixth terminal are perpendicular to the surface of the detection circuit board and have reserved wiring holes.

[0018] In some embodiments, the capacitor module includes six capacitors, which are regularly arranged in the first area and every three capacitors are connected in series to form a capacitor branch.

[0019] In some embodiments, the driving circuit includes a power driving chip, and a voltage output terminal of the power driving chip is used to output a conduction voltage that matches the IGBT device to be tested.

[0020] In a second aspect, an embodiment of the present application further provides a detection device, comprising a detection circuit board as described in the first aspect.

[0021] The detection circuit board and detection equipment of the IGBT device in the embodiment of the present application have at least the following beneficial effects: the detection circuit board provides a short-circuit current for the IGBT device through capacitor charging, and provides a turn-on voltage for the IGBT device through a driving circuit. By using capacitor charging, the voltage across the IGBT device can be accurately controlled, and then the IGBT device is turned on to measure the short-circuit tolerance after the detection circuit is stabilized as a whole, which can improve the accuracy of the test. In addition, an IGBT device connection socket is also provided on the circuit board, and the IGBT device to be tested can be detachably installed, so that the circuit board can be reused for multiple short-circuit tolerance tests.

[0022] Other features and advantages of the present application will be described in the following description, and partly become apparent from the description, or understood by practicing the present application. The purpose and other advantages of the present application can be realized and obtained through the structures particularly pointed out in the description and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is a stereogram of a detection circuit provided in an embodiment of the present application;

[0024] Figure 2 is a circuit topology diagram of a detection circuit board provided in an embodiment of the present application;

[0025] Figure 3 It is a schematic diagram of the layout of the detection circuit board provided in the embodiment of the present application. Description of the drawings:

[0027] Voltage stabilizing circuit 100, capacitor module 110

[0028] IGBT device connection seat 200

[0029] Driving circuit 300

[0030] Protection circuit 400

[0031] The first area 510 and the second area 520

[0032] Power driver chip IC1, first terminal CN1, second terminal CN2, third terminal CN3, fourth terminal CN4, fifth terminal CN5, sixth terminal CN6, first resistor R1, second resistor R2, sampling resistor R3, voltage regulator diode ZD1, diode group D1 DETAILED DESCRIPTION

[0033] In order to make the purpose, technical solutions and advantages of the present application clearer, the present application is further described in detail below in conjunction with the accompanying drawings and examples. It should be understood that the specific embodiments described herein are only used to explain the present application and are not intended to limit the present application. In addition, the characteristics, operations or features described in the specification can be combined in any appropriate manner to form various implementation methods. At the same time, the steps or actions in the method description can also be replaced or adjusted in order in a manner that is obvious to those skilled in the art. Therefore, the various sequences in the specification and the accompanying drawings are only for the purpose of clearly describing a certain embodiment and are not meant to be a necessary sequence, unless otherwise specified that a certain sequence must be followed.

[0034] In the description of this application, "several" means one or more, "more" means more than two, "greater than", "less than", "exceed", etc. are understood to exclude the number itself, and "above", "below", "within", etc. are understood to include the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0035] The serial numbers of the components in this document, such as "first", "second", etc., are only used to distinguish the objects described and do not have any order or technical meaning. The "connection" and "coupling" mentioned in this application, unless otherwise specified, include direct and indirect connections (couplings).

[0036] At present, more and more insulated gate bipolar transistor (IGBT) devices are used in air-conditioning systems. Therefore, the stability of IGBT devices has an increasingly greater impact on the stability of air-conditioning systems. In order to determine the selection of IGBT devices during the production process, it is necessary to measure the short-circuit tolerance of IGBT devices. At present, the short-circuit tolerance measurement follows its definition, turning on the IGBT device under a large current, and measuring the time the IGBT device can maintain normal operation under the impact of a large current. The solution of the prior art directly applies a large voltage to the IGBT device through a power supply, controls the conduction of the IGBT device through chips such as FPGA, and tests the voltage and / or current at both ends of the IGBT device during the conduction period to determine the short-circuit tolerance of the IGBT device. In the above scheme, the power supply may be unstable and will be affected by the action of the IGBT device, and the current short-circuit tolerance test is a temporary circuit, and there is no corresponding test equipment, which affects the accuracy of the short-circuit tolerance test.

[0037] Based on this, the embodiment of the present application provides a detection circuit board and detection equipment for an IGBT device. By charging the capacitor to a certain voltage, it can provide sufficient short-circuit current when the IGBT device is turned on. In addition, the circuit elements are integrated into the detection circuit board, and a detachable IGBT device connection socket is provided to obtain a short-circuit tolerance test equipment that can be repeatedly tested. Therefore, the detection circuit board of the embodiment of the present application can improve the measurement accuracy, and provide a reusable short-circuit tolerance test equipment, which is convenient for testing various models of IGBT devices and convenient for production personnel to select.

[0038] The detection circuit board and detection equipment of the IGBT device are described below with reference to the accompanying drawings.

[0039] Reference Figure 1 and Figure 2 As shown, Figure 1 is a three-dimensional diagram of a detection circuit of an embodiment of the present application, Figure 1 : is a circuit topology diagram of the detection circuit board of the embodiment of the present application. The detection circuit board of the IGBT device includes:

[0040] The voltage stabilizing circuit 100 includes a test voltage input terminal and a capacitor module 110, wherein the capacitor module 110 is connected to the positive electrode and the negative electrode of the test voltage input terminal;

[0041] An IGBT device connection base 200 is used to detachably install an IGBT device to be tested. The IGBT device connection base 200 includes a first connection end, a second connection end, and a third connection end. The first connection end is connected to one end of the capacitor module 110 through a sampling resistor R3, the second connection end is connected to the other end of the capacitor module 110, and the third connection end is used to connect to a control pin of the IGBT device to be tested;

[0042] The driving circuit 300 has a voltage output terminal connected to the third connection terminal, and is used to provide a conduction voltage to the IGBT device to be tested.

[0043] The circuit topology diagram includes a capacitor module 110 and a drive circuit 300. The capacitor module 110 is connected to the test voltage input terminal. The capacitor module 110 is charged with the voltage of the test voltage input terminal so that the capacitor module 110 reaches the specified test voltage. The two ends of the capacitor module 110 are respectively connected to the two switch pins of the IGBT device, for example, the positive electrode of the capacitor module 110 is connected to the collector of the IGBT device in the discharge state, and the negative electrode of the capacitor module 110 is connected to the emitter of the IGBT device in the discharge state. The control pin of the IGBT device, that is, the gate is connected to the drive circuit 300. The drive circuit 300 can output a turn-on voltage to turn on the IGBT device to control the turn-on moment of the IGBT device during the short-circuit tolerance test.

[0044] The capacitor module 110 includes at least two parallel capacitor branches, each of which is composed of a plurality of capacitors connected in series. Figure 2 As shown, two capacitor branches are set in parallel between the test voltage input terminal and the positive electrode and the negative electrode of the test voltage input terminal, and each capacitor branch is composed of three capacitors in series. Reducing the capacitance by connecting multiple capacitors in series is the key to achieving stable voltage, while improving the withstand voltage of the capacitor branch to meet the test requirements of large voltage. Therefore, for different capacitor selections, different numbers of capacitors in series can be set in the capacitor branch and different numbers of capacitor branches can be set to adapt to different test voltage requirements. For example, in the case where the above six capacitors form two capacitor branches, an electrolytic capacitor of 820uF-500V is selected, so that the detection equipment can reach a withstand voltage level of 1500V voltage (if a 600V withstand voltage capacitor is used, the withstand voltage of the tested equipment can reach 1800V), so that all IGBT devices that can be used by the air conditioning system controller can be covered.

[0045] In addition, since the sampling resistor R3 is connected in series with the IGBT device to withstand the large short-circuit current, the sampling resistor R3 needs to use a high-power current-withstanding resistor. At the same time, the range of the oscilloscope current probe needs to be considered during the test (the short-circuit current can exceed 1000 amps, and the current oscilloscope probe cannot meet this requirement). Therefore, the sampling resistor R3 needs to reduce the current on the branch where it is located to suit the range of the oscilloscope probe. For example, an ultra-high-power cement resistor is selected as the sampling resistor R3, which can adapt to an instantaneous current of more than 1000 amps, and is used to detect the voltage at both ends to calculate the current flowing through the IGBT device.

[0046] In some embodiments, a protection circuit 400 is further included, and the protection circuit 400 includes a voltage stabilizing device, wherein the negative electrode of the voltage stabilizing device is connected to the third connection terminal, and the positive electrode of the voltage stabilizing device is grounded.

[0047] The protection circuit 400 is arranged between the voltage output terminal of the driving circuit 300 and the third terminal of the IGBT device mounting seat, and is used to stabilize the gate voltage to protect the gate of the IGBT device from external surge interference and false triggering. Among them, the positive pole of the voltage stabilizing device is connected to GND, and the negative pole of the voltage stabilizing device is connected to the third connection terminal. When the voltage on the third connection terminal fluctuates and becomes larger, the voltage stabilizing device can be turned on instantly to pull down the voltage of the third connection terminal to protect the IGBT device. The voltage stabilizing device can use a single voltage stabilizing diode ZD1, and the voltage stabilizing diode ZD1 is anti-parallel between the third terminal and the second terminal of the IGBT device connection seat 200, and the second terminal of the IGBT device connection seat 200 and the test voltage input terminal are both connected to GND, which is equivalent to the positive pole of the voltage stabilizing diode ZD1 being grounded. The voltage stabilizing device can also use other components that can limit voltage fluctuations or use a combination of components and devices such as resistors, capacitors, and inductors, which are not limited here.

[0048] In some embodiments, the protection circuit 400 further includes a voltage divider circuit, one end of which is connected to the voltage output end of the driving circuit 300, the other end of which is grounded, and the voltage dividing point of the voltage divider circuit is connected to the third connection end. Figure 2 The voltage divider circuit is composed of a first resistor R1 and a second resistor R2 connected in series, and the connection point of the first resistor R1 and the second resistor R2 is connected to the third connection terminal, wherein the first resistor R1 is mainly used for current limiting to limit the current to the milliampere level, and the second resistor R2 is mainly used for voltage division, and combined with the first resistor R1 to stabilize the voltage output terminal of the drive circuit 300, thereby stabilizing the gate drive voltage of the IGBT device.

[0049] In addition, the protection circuit 400 may further include a diode group D1, which includes one or more diodes connected in parallel, the cathodes of which are connected to the first resistor R1 and the voltage output terminal of the driving circuit 300, and the anodes of which are connected to GND. By enhancing the protection through the diode group D1, the problem of GND interfering with the test stability during the test can be reduced.

[0050] In some embodiments, the detection circuit board further includes:

[0051] The first area 510 is used to install the capacitor module 110;

[0052] The second area 520 is used to install the IGBT device connection base 200, the drive circuit 300 and the sampling resistor R3;

[0053] The first area 510 and the second area 520 are arranged side by side on the detection circuit board.

[0054] The wiring of the circuit board is planned according to the distribution of electrical components. In order to facilitate the testers to use the test circuit board, the larger electrical components such as capacitors are concentrated in the first area 510, and the smaller electrical components such as the IGBT device connector 200, the drive circuit 300 and the sampling resistor R3 are concentrated in the second area 520, so that the testers can plug and unplug the IGBT device in the first area 510 for testing, and it is also convenient for the testers to connect the wires in the first area 510. The first area 510 and the second area 520 are connected by the circuit inside the board. Figure 3 The circuit layout schematic diagram shown, the left area is the first area 510, and twelve metal points or pads are reserved for connecting 6 electrolytic capacitors, wherein the capacitance value of the electrolytic capacitor is relatively large, so if the electrolytic capacitor is connected by metal points, it is necessary to ensure the copper area and thickness (for example, the thickness is more than 2 ounces) of the metal points, if there is no occurrence to meet the copper requirements, the pins of the electrolytic capacitors are connected by pads and through holes. Due to the large volume of the electrolytic capacitor, the first area 510 is set to occupy approximately two-thirds of the entire detection circuit board, and the remaining approximately one-third of the area is used to install the IGBT device connection seat 200, the drive circuit 300 and the sampling resistor R3, wherein the upper position in the middle of the second area 520 is the connection position of the IGBT device mounting seat. As for the drive circuit 300 and the sampling resistor R3, they are distributed near the IGBT device mounting seat, and it is not pointed out one by one here, and their positions can be arranged according to the actual circuit routing situation.

[0055] In some embodiments, the detection circuit board also includes a first terminal CN1, a second terminal CN2, a third terminal CN3, a fourth terminal CN4, a fifth terminal CN5 and a sixth terminal CN6; the first terminal CN1 is used to connect the positive pole of the test voltage input terminal, the second terminal CN2 is used to connect the negative pole of the test voltage input terminal, the third terminal CN3 and the fourth terminal CN4 are used to connect the ground wire, the fifth terminal CN5 is used to connect the power supply terminal of the drive circuit 300, and the sixth terminal CN6 is used to connect the signal input terminal of the drive circuit 300.

[0056] The first terminal CN1, the second terminal CN2, the third terminal CN3, the fourth terminal CN4, the fifth terminal CN5 and the sixth terminal CN6 are all physical terminals for connecting external devices or external cables. Figure 3In the circuit layout shown, the uppermost metal point or pad in the second area 520 is used to connect the first terminal CN1, which is used to connect the positive pole of the test power supply. Below the first terminal CN1 are the metal points or pads of the fifth terminal CN5 and the sixth terminal CN6, which are respectively used to connect the power supply end and the signal input end of the drive circuit 300. Therefore, the fifth terminal CN5 and the sixth terminal CN6 are arranged close to the drive circuit 300, and further below are the metal points or pads of the second terminal CN2, the fourth terminal CN4 and the third terminal CN3. The third terminal CN3 and the fourth terminal CN4 are both ground terminals, and the second terminal CN2 is used to connect the negative pole of the test power supply.

[0057] In order to facilitate the tester to connect the wires, the first terminal CN1, the second terminal CN2, the third terminal CN3, the fourth terminal CN4, the fifth terminal CN5 and the sixth terminal CN6 are perpendicular to the surface of the detection circuit board and have reserved connection holes. Figure 2 As shown, the first terminal CN1, the second terminal CN2, the third terminal CN3, the fourth terminal CN4, the fifth terminal CN5 and the sixth terminal CN6 extend upward along the detection circuit board, and a circular hole is set. The first terminal CN1, the second terminal CN2, the third terminal CN3, the fourth terminal CN4, the fifth terminal CN5 and the sixth terminal CN6 can be a single three-dimensional metal part, which is fixed to the corresponding metal point or pad, and the wiring hole is set above the circuit board. Through such a setting, the tester can easily connect the cable to the terminal and also easily remove the cable from the terminal.

[0058] In some embodiments, the drive circuit 300 includes a power driver chip IC1, and the voltage output terminal of the power driver chip IC1 is used to output a conduction voltage that matches the IGBT device to be tested. The power driver chip IC1 includes eight pins, mainly using the first input pin INA and the first output pin OUTB. The first input pin INA is connected to the sixth terminal CN6 as a signal input terminal, and the first output pin OUTB is connected to the third connection terminal of the IGBT device mounting base through the protection circuit 400. The power driver chip IC1 also includes VSS and VDD terminals, and the VDD output is connected to the fifth terminal CN5. When VDD outputs a stable voltage value, it can be confirmed that the power driver chip IC1 is in a state of stably outputting the gate drive voltage. VSS is connected to GND.

[0059] During the test, the capacitor module 110 is charged by the test power supply so that the voltage across the capacitor module 110 is stabilized to the test voltage, and then power is supplied to the drive circuit 300, and a signal is input to the signal input end of the drive circuit 300 so that the drive circuit 300 outputs a turn-on voltage at the voltage output end. The IGBT device to be tested is turned on, and the capacitor module 110 discharges the IGBT device. During this period, the voltage / current waveform on the IGBT device is recorded by an oscilloscope, so that the short-circuit tolerance can be obtained and the short-circuit energy can be calculated.

[0060] The detection circuit board of the present application is described in detail below through a specific example.

[0061] Reference Figure 1 , Figure 2 and Figure 3 The detection circuit board includes a driving circuit 300, a protection circuit 400, an IGBT device to be tested and a capacitor module 110 in terms of circuit topology. The capacitor module 110 is connected to the test voltage input terminal. The capacitor module 110 is connected in parallel between the positive and negative electrodes connected to the test voltage input terminal through two capacitor branches. Each capacitor branch is composed of three electrolytic capacitors connected in series. Each electrolytic capacitor is a 820uF-500V capacitor, so that the entire detection device can reach a withstand voltage level of 1500V.

[0062] One switch pin of the IGBT device to be tested is connected to the positive electrode of the test voltage input terminal through the sampling resistor R3, and the other switch pin is connected to the negative electrode of the test voltage input terminal. The control pin of the IGBT device to be tested is connected to the drive circuit 300 through the protection circuit 400. The sampling resistor R3 uses a 20W-10mΩ ultra-high power cement resistor to adapt to the instantaneous large current flowing through. The current size of the short-circuit withstand is obtained by testing the voltage across the sampling resistor R3.

[0063] The protection circuit 400 is used to protect the gate of the IGBT device from the impact of large current and large voltage, and includes a first resistor R1, a second resistor R2, a voltage-stabilizing diode ZD1 and a diode group D1. The purpose of the first resistor R1 and the second resistor R2 is to maintain the stability of the gate signal, and the current needs to be limited to the milliampere level. The voltage-stabilizing diode ZD1 and the diode group D1 are both connected in anti-parallel. The voltage output end of the driving circuit 300 is connected to the control pin of the IGBT device to be tested through the first resistor R1. A voltage-stabilizing diode ZD1 is set in parallel with the second resistor R2 between the connection point between the voltage output end and the control pin and the ground end. A diode group D1 is set between the connection point between the voltage output end and the first resistor R1 and the ground end, which can ensure that the Vge of the IGBT device is coupled to the high voltage to prevent the IGBT device from failing prematurely, and can quickly introduce the high voltage into the ground end. The voltage-stabilizing diode ZD1 requires its response speed to be much lower than the millisecond level, and a voltage-stabilizing diode ZD1 with a response speed of nanoseconds should be selected.

[0064] The driving circuit 300 includes a driving chip. This example uses a low-latency 4427 switch tube driver chip. The gate voltage output terminal of the driver chip is OUTB, which is connected to the gate of the IGBT device to be tested through the first resistor R1. OUTB outputs a 15V voltage to drive the IGBT device to turn on. The INB of the driver chip is connected to the signal input terminal. Its function is to amplify the input signal (for example, 5V voltage) through the 4427 switch tube driver chip to become a voltage signal that can drive the IGBT device to turn on, and control the IGBT to turn on and off through the first resistor R1. The above protection circuit 400 is suitable for 15V voltage regulation, mainly used to protect the gate from false triggering caused by external surge interference. In addition, the VSS pin of the 4427 switch tube driver chip is connected to the ground terminal GND, and the test voltage input terminal is also connected to the ground terminal GND. The VDD of the 4427 switch tube driver chip is the chip power supply terminal. The time difference between the input and output (INA and OUTB) of the 4427 switch tube driver chip is at the nanosecond level, generally 4.5nS, and it is also applicable to other chips with the same function.

[0065] In terms of the layout of the circuit board, the detection circuit board is divided into a first area 510 and a second area 520. The first area 510 is provided with twelve metal points for connecting the above-mentioned six electrolytic capacitors, and the second area 520 is provided with an IGBT device mounting seat, a sampling resistor R3, a driver chip, a first resistor R1 in the protection circuit 400, a second resistor R2, a voltage regulator diode ZD1 and a diode group D1. The first area 510 and the second area 520 are arranged side by side and connected through the circuit inside the board. Among them, the copper plating at the corresponding electrolytic capacitor pins on the detection circuit board should be large, and the copper thickness should be more than 2 ounces. The copper plating width at the two places corresponding to the collector and emitter of the IGBT device mounting seat should be greater than 5mm. If this requirement is not met, through-hole processing is required on the detection circuit board.

[0066] The detection circuit board also includes a first terminal CN1, a second terminal CN2, a third terminal CN3, a fourth terminal CN4, a fifth terminal CN5 and a sixth terminal CN6, which are all physical terminals for connecting external devices or external cables. The top metal point or pad in the second area is used to connect the first terminal CN1, and the first terminal CN1 is respectively the metal point or pad of the fifth terminal CN5 and the sixth terminal CN6, which are respectively used to connect the power supply end and the signal input end of the drive circuit 300, so the fifth terminal CN5 and the sixth terminal CN6 are arranged close to the drive circuit 300, and further downward are the metal points or pads of the second terminal CN2, the fourth terminal CN4 and the third terminal CN3, respectively, and the third terminal CN3 and the fourth terminal CN4 are both ground terminals, and the second terminal CN2 is used to connect the negative pole of the test power supply. In order to facilitate the tester to connect the wires, the first terminal CN1, the second terminal CN2, the third terminal CN3, the fourth terminal CN4, the fifth terminal CN5 and the sixth terminal CN6 are all perpendicular to the surface of the detection circuit board and reserved with wiring holes.

[0067] In the test process, the high voltage input is adjusted under given conditions to charge the electrolytic capacitor, and the charging voltage is stabilized to the required test voltage. The driver chip is powered while charging, so that the voltage at the power supply end of the driver chip is stable.

[0068] Then use the signal generator to output the driving waveform. After the driving waveform signal is amplified by the 4427 switch tube driver chip, it forms a conduction signal that can drive the gate of the IGBT device to turn on. At this time, the IGBT device is turned on, and the test voltage is applied to the collector and emitter of the IGBT device.

[0069] During this period, turn on the oscilloscope, adjust it to the trigger mode, and use the oscilloscope to record the Ice, Vge, and Vce waveforms when the conduction signal is input to the gate of the IGBT device. The process from Vge turning on to the waveform distortion is the short-circuit tolerance Δt tested. By integrating Vce*Ice on Δt, the short-circuit energy E can be obtained, which can characterize the energy impact that the IGBT device can withstand during the short-circuit process.

[0070] In summary, the detection circuit board provides a short-circuit current for the IGBT device through capacitor charging, and provides a turn-on voltage for the IGBT device through the driving circuit 300. By using capacitor charging, the voltage across the IGBT device can be accurately controlled, and then the IGBT device is turned on to perform short-circuit tolerance measurement after the detection circuit is overall stable, which can improve the accuracy of the test. In addition, an IGBT device connection socket 200 is also provided on the circuit board, on which the IGBT device to be tested can be detachably installed, so that the circuit board can be reused for multiple short-circuit tolerance tests.

[0071] An embodiment of the present application also provides a detection device, including the detection circuit board in any of the above embodiments.

[0072] It should be understood that in the present application, "at least one (item)" means one or more, and "plurality" means two or more. "And / or" is used to describe the association relationship of associated objects, indicating that three relationships may exist. For example, "A and / or B" can mean: only A exists, only B exists, and A and B exist at the same time, where A and B can be singular or plural. The character " / " generally indicates that the objects associated before and after are in an "or" relationship. "At least one of the following" or similar expressions refers to any combination of these items, including any combination of single or plural items. For example, at least one of a, b or c can mean: a, b, c, "a and b", "a and c", "b and c", or "a and b and c", where a, b, c can be single or multiple.

[0073] In several embodiments provided in the present application, it should be understood that the disclosed systems, apparatuses and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely schematic, for example, the division of units is only a logical function division, and there may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of apparatuses or units, which can be electrical, mechanical or other forms. The units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the scheme of this embodiment.

[0074] It should also be understood that the various implementations provided in the embodiments of the present application can be combined arbitrarily to achieve different technical effects.

[0075] The above is a specific description of the preferred implementation of the present application, but the present application is not limited to the above-mentioned implementation mode. Technical personnel familiar with the field can also make various equivalent deformations or substitutions without violating the spirit of the present application. These equivalent deformations or substitutions are all included in the scope defined by the claims of the present application.

Claims

1. A detection circuit board for an IGBT device, characterized in that: include: A voltage stabilizing circuit, comprising a test voltage input terminal and a capacitor module, wherein the capacitor module is connected to a positive electrode and a negative electrode of the test voltage input terminal; An IGBT device connection socket, used for detachably mounting an IGBT device to be tested, the IGBT device connection socket comprising a first connection end, a second connection end and a third connection end, the first connection end being connected to one end of the capacitor module through a sampling resistor, the second connection end being connected to the other end of the capacitor module, and the third connection end being used for connecting a control pin of the IGBT device to be tested; A drive circuit, wherein a voltage output terminal of the drive circuit is connected to the third connection terminal, and is used to provide a conduction voltage to the IGBT device to be tested.

2. The detection circuit board according to claim 1, characterized in that: The capacitor module includes at least two parallel capacitor branches, and the capacitor branch is composed of multiple capacitors connected in series.

3. The detection circuit board according to claim 1, characterized in that: It also includes a protection circuit, which includes a voltage stabilizing device, a negative electrode of the voltage stabilizing device is connected to the third connection terminal, and a positive electrode of the voltage stabilizing device is grounded.

4. The detection circuit board according to claim 3, characterized in that: The protection circuit further comprises a voltage divider circuit, one end of the voltage divider circuit is connected to the voltage output end of the drive circuit, the other end of the voltage divider circuit is grounded, and a voltage dividing point of the voltage divider circuit is connected to the third connection end.

5. The detection circuit board according to claim 1, characterized in that: The detection circuit board also includes: The first area is used to install the capacitor module; The second area is used to install the IGBT device connection socket, the drive circuit and the sampling resistor; The first area and the second area are arranged side by side on the detection circuit board.

6. The detection circuit board according to claim 1, characterized in that: It also includes a first terminal, a second terminal, a third terminal, a fourth terminal, a fifth terminal and a sixth terminal; the first terminal is used to connect the positive pole of the test voltage input terminal, the second terminal is used to connect the negative pole of the test voltage input terminal, the third terminal and the fourth terminal are used to connect the ground wire, the fifth terminal is used to connect the power supply terminal of the drive circuit, and the sixth terminal is used to connect the signal input terminal of the drive circuit.

7. The detection circuit board according to claim 6, characterized in that: The first terminal, the second terminal, the third terminal, the fourth terminal, the fifth terminal and the sixth terminal are perpendicular to the surface of the detection circuit board and have reserved wiring holes.

8. The detection circuit board according to claim 5, characterized in that: The capacitor module includes six capacitors, which are regularly arranged in the first area and every three capacitors are connected in series to form a capacitor branch.

9. The detection circuit board according to claim 1, characterized in that: The driving circuit comprises a power driving chip, and a voltage output terminal of the power driving chip is used to output a conduction voltage matching the IGBT device to be tested.

10. A detection device, characterized in that: It comprises a detection circuit board as described in any one of claims 1 to 9.

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