Power module test platform device

Abstract

The utility model discloses a power module test platform device, which comprises a box body, a total input power supply of the box body is connected with a switching power supply S1 and a switching power supply S2, a BOOST circuit and a control circuit are arranged in the box body, the BOOST circuit comprises a relay K1, a low-voltage energy storage capacitor C1, a boost inductor L1, an IGBT module and a voltage sensor V1, and the IGBT module comprises a switching tube Q1 and a diode D1; the control circuit comprises a driving board P1, a control board U1 and an upper computer. When the voltage of the direct current support capacitor C2 at the output side is higher than the voltage of the low voltage side, the diode D1 can be automatically cut off, so that a switching device is not needed, and the safety performance is higher; meanwhile, a 110VDC low-voltage switching power supply S1 is adopted, the overall size is small, a switching tube Q1 and a diode D1 work in a monopulse mode, and heat dissipation is not needed.

Description

Technical Field

[0001] The utility model relates to the technical field of test platforms, in particular to a power module test platform device. Background Art

[0002] During the design phase, high-power electronic products such as rail transit converters require double pulse testing to determine the switching characteristics of IGBTs (Insulated Gate Bipolar Transistors). This testing method generally requires the construction of a platform, but this has drawbacks such as high test equipment requirements, high execution costs, and low safety due to excessively high bus voltages. Figure 1 As shown in the double pulse test schematic diagram, in the double pulse test, there is a certain danger if the power supply S1' continues to supply power. Therefore, the DC support capacitor C1' must be disconnected from the bus voltage (that is, the switch K1' must be disconnected). After the DC support capacitor C1' is fully charged, disconnecting the switch K1' requires a high-voltage contactor or an air switch. However, the high-voltage contactor is large in size, and the air switch needs to be manually operated, which is dangerous. In addition, the power supply S1' used is generally a power supply with an input of 380V and an output of up to 2000V. It has high power and a large size. However, this test scenario has a relatively low power requirement for the power supply, so the existing power module test platform is not suitable. Utility Model Content

[0003] The purpose of the present invention is to address the deficiencies of the prior art and provide a power module test platform device with an integrated structure, which is simple, convenient and practical and can meet the test platform requirements of different projects.

[0004] To achieve this purpose, the present invention adopts the following technical solutions:

[0005] A power module test platform device includes a box, the total input power of the box is 2200VAC mains electricity, the total input power is connected to a switching power supply S1 and a switching power supply S2, a BOOST boost circuit and a control circuit are provided in the box, the switching power supply S1 provides voltage for the BOOST boost circuit, and the switching power supply S2 provides voltage for the control circuit;

[0006] The BOOST boost circuit includes a relay K1, a low-voltage energy storage capacitor C1, a boost inductor L1, an IGBT module and a voltage sensor V1. The switching power supply S1 is connected to one end of the relay K1, the low-voltage energy storage capacitor C1 is connected in parallel to both ends of the switching power supply S1 and the relay K1, the other end of the relay K1 is connected to the boost inductor L1, the boost inductor L1 is connected to the IGBT module, and the voltage sensor V1 is connected in parallel to both ends of the IGBT module;

[0007] The control circuit includes a drive board P1 and a control board U1. The drive board P1 is connected to the IGBT module, and the control board U1 is connected to the drive board P1. The control board U1 is connected to a host computer via Ethernet. The host computer can control the BOOST boost circuit through the control board U1 to boost the voltage and output single pulse, double pulse and multiple pulses.

[0008] As a preferred solution of the power module test platform device, the IGBT module includes a switch tube Q1 and a diode D1, the driving board P1 is connected to the base of the switch tube Q1, the emitter of the switch tube Q1 is grounded, the collector of the switch tube Q1 is connected in parallel with the boost inductor L1 and then connected to the positive electrode of the diode D1, and the negative electrode of the diode D1 is connected to the DC support capacitor C2.

[0009] As a preferred solution of the power module test platform device, the DC support capacitor C2 is connected to the power inductor L2, power inductor L3, power resistor R1 and power resistor R2 for double pulse testing, the power inductor L2 is connected in series with the power inductor L3, and the power resistor R1 is connected in series with the power resistor R2.

[0010] As a preferred solution of the power module test platform device, the control circuit further includes an alarm device, which provides reminders and warnings by emitting sound and light signals.

[0011] As a preferred solution of the power module test platform device, the control circuit also includes an emergency stop device, which can be manually pressed to quickly and reliably cut off the power.

[0012] As a preferred solution of the power module test platform device, the total input power supply is also connected to a power strip, which provides voltage to a voltage power probe, a current power probe, an oscilloscope, and a host computer.

[0013] As a preferred solution of the power module test platform device, the switching power supply S1 outputs 110VDC, and the switching power supply S2 outputs 24VDC.

[0014] Beneficial effects of the utility model:

[0015] After the power module test platform device of the present invention starts the switching power supply S1 to charge the low-voltage energy storage capacitor C1, when the current of the power supply S2 is 0, it means that the low-voltage energy storage capacitor C1 and the DC support capacitor C2 have reached the output voltage of the switching power supply S1. Then, the control board U1 outputs a short pulse to the driver board P1 to drive the switch tube Q1 to turn on for a period of time. At this time, since the positive electrode of the diode D1 is pulled to the ground and the negative electrode has voltage, the diode D1 will be in the cut-off state; and the current of the inductor L1 increases linearly. When the falling edge of the pulse comes, since the current of the inductor L1 cannot change suddenly, the inductor L1 A high voltage (greater than the voltage of the DC support capacitor C2) is induced on the right side, causing the diode D1 to be turned on, and the current of the inductor L1 flows to the DC support capacitor C2 to charge until the current of the inductor L1 is 0, and the diode D1 is automatically cut off. Therefore, there is no need to add a switching device, which solves the technical problem that the high-voltage contactor is large in size and the air switch needs to be manually switched, and has higher safety performance; at the same time, the utility model adopts a 110VDC low-voltage switching power supply S1, which has a small overall size, and the switch tube Q1 and the diode D1 both work in the form of a single pulse, and no heat dissipation is required. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments of the present invention. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be derived from these drawings without inventive effort.

[0017] Figure 1 It is a circuit schematic diagram of a double-pulse test platform in the prior art.

[0018] Figure 2 It is a structural schematic diagram of the power module test platform device described in the utility model.

[0019] Figure 3 This is a circuit schematic diagram of the power module test platform device described in the utility model.

[0020] Figure 4 It is a circuit principle diagram of the BOOST boost circuit described in the utility model. DETAILED DESCRIPTION

[0021] The technical solution of the present invention will be further described below with reference to the accompanying drawings and through specific implementation methods.

[0022] Among them, the drawings are only used for illustrative purposes and represent only schematic diagrams rather than actual pictures, and should not be understood as limiting this patent; in order to better illustrate the embodiments of the utility model, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of the actual product; for those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted.

[0023] The same or similar numbers in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if the terms "upper", "lower", "left", "right", "inside", "outside" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the drawings, they are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and cannot be understood as limiting this patent. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0024] In the description of this utility model, unless otherwise expressly specified or limited, when the term "connection" or the like appears to indicate a connection relationship between components, such term should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be internal communication between two components or an interaction relationship between two components. For those skilled in the art, the specific meanings of the above terms in this utility model can be understood according to the specific circumstances.

[0025] like Figure 2 and Figure 3 As shown, the utility model provides a power module test platform device, including a box body, the total input power supply of the box body is 2200VAC mains electricity, the total input power supply is connected to a switching power supply S1 and a switching power supply S2, the switching power supply S1 outputs 110VDC, and the switching power supply S2 outputs 24VDC. A BOOST boost circuit and a control circuit are provided in the box body, the switching power supply S1 provides voltage for the BOOST boost circuit, the BOOST boost circuit can provide an adjustable high voltage for double pulse testing, with a maximum output of 2000V, and the switching power supply S2 provides voltage for the control circuit;

[0026] like Figure 4As shown, the BOOST boost circuit specifically includes a relay K1, a low-voltage energy storage capacitor C1, a boost inductor L1, an IGBT module and a voltage sensor V1. The switching power supply S1 is connected to one end of the relay K1, the low-voltage energy storage capacitor C1 is connected in parallel across the switching power supply S1 and the relay K1, the other end of the relay K1 is connected to the boost inductor L1, the boost inductor L1 is connected to the IGBT module, and the voltage sensor V1 is connected in parallel across the IGBT module.

[0027] The control circuit specifically includes a driver board P1 and a control board U1. The driver board P1 is connected to the IGBT module for driving the IGBT module; the control board U1 is connected to the driver board P1. The control board U1 is connected to a host computer via Ethernet. The host computer can control the BOOST boost circuit through the control board U1 to boost the voltage and output single pulse, double pulse and multiple pulses. The single pulse mode can be used for short-circuit testing; the double pulse mode is used for IGBT switching characteristic testing, that is, double pulse testing; the multiple pulse mode can be used for module aging.

[0028] Specifically, the IGBT module of this embodiment includes a switch tube Q1 and a diode D1, the driving board P1 is connected to the base of the switch tube Q1, the emitter of the switch tube Q1 is grounded, the collector of the switch tube Q1 is connected to the boost inductor L1 in parallel and then connected to the positive electrode of the diode D1, the negative electrode of the diode D1 is connected to the DC support capacitor C2, the DC support capacitor C2 is connected to the power inductor L2, power inductor L3, power resistor R1 and power resistor R2 for double pulse testing, the power inductor L2 and the power inductor L3 are connected in series, and the power resistor R1 and the power resistor R2 are connected in series. This embodiment uses two devices of equal value in series to lead out three contacts, so that one times the value, two times the value or half the value can be selected according to the connection method.

[0029] The control circuit also includes an alarm device, which reminds and warns by emitting sound and light signals.

[0030] The control circuit also includes an emergency stop device, which can be manually pressed to quickly and reliably cut off the power.

[0031] The total input power is also connected to a power strip, which can provide voltage for information acquisition devices such as voltage power probes, current power probes, oscilloscopes, and host computers.

[0032] The working principle of the power module test platform device of this utility model is as follows:

[0033] First, start the switching power supply S1 to charge the low-voltage energy storage capacitor C1. When the current of the power supply S2 is 0, it means that the low-voltage energy storage capacitor C1 and the DC support capacitor C2 have reached the output voltage of the switching power supply S1. Then use the control board U1 to output a short pulse to the driver board P1 to drive the switch tube Q1 to turn on for a period of time. At this time, since the positive electrode of the diode D1 is pulled to the ground and the negative electrode has voltage, the diode D1 will be in the cut-off state; and the current of the inductor L1 increases linearly. When the falling edge of the pulse comes, since the current of the inductor L1 cannot change suddenly, a high voltage (greater than the DC support) is induced on the right side of the inductor L1 The voltage of capacitor C2) causes diode D1 to turn on, and the current of inductor L1 flows to the DC support capacitor C2 to charge until the current of inductor L1 is 0, and diode D1 is automatically cut off. At this time, the voltage of DC support capacitor C2 can be seen to rise through the detection device. Then the second pulse is fed into the control board U1, and the cycle is carried out in sequence. Each pulse will store the power supply energy in the inductor. The moment the switch tube Q1 is turned off, this energy flows into the DC support capacitor C2. As long as there is current flowing to the inductor L1, the power of DC support capacitor C2 can be boosted to a higher level.

[0034] In the present invention, when the voltage of the DC support capacitor C2 on the output side is higher than the voltage on the low-voltage side, the diode D1 will be automatically cut off and shut down. Therefore, the present invention does not need to add a switching device, which solves the technical problem that the high-voltage contactor is large in size and the air switch needs to be manually switched, and has higher safety performance. At the same time, the present invention adopts a 110VDC low-voltage switching power supply S1, which has a small overall size, and the switch tube Q1 and the diode D1 both work in the form of a single pulse, and no heat dissipation is required.

[0035] It should be noted that the above-described specific embodiments are merely preferred embodiments of the present invention and the technical principles employed. Those skilled in the art will appreciate that various modifications, equivalent substitutions, and variations may be made to the present invention. However, as long as these modifications do not depart from the spirit of the present invention, they are within the scope of protection of the present invention. Furthermore, certain terms used in the specification and claims of this application are not intended to be limiting but are provided for ease of description only.

Claims

1. A power module test platform device, characterized in that: The box includes a total input power supply of 2200VAC mains electricity, the total input power supply is connected to a switching power supply S1 and a switching power supply S2, a BOOST boost circuit and a control circuit are provided in the box, the switching power supply S1 provides voltage for the BOOST boost circuit, and the switching power supply S2 provides voltage for the control circuit; The BOOST boost circuit includes a relay K1, a low-voltage energy storage capacitor C1, a boost inductor L1, an IGBT module and a voltage sensor V1. The switching power supply S1 is connected to one end of the relay K1, the low-voltage energy storage capacitor C1 is connected in parallel to both ends of the switching power supply S1 and the relay K1, the other end of the relay K1 is connected to the boost inductor L1, the boost inductor L1 is connected to the IGBT module, and the voltage sensor V1 is connected in parallel to both ends of the IGBT module; The control circuit includes a drive board P1 and a control board U1. The drive board P1 is connected to the IGBT module, and the control board U1 is connected to the drive board P1. The control board U1 is connected to a host computer via Ethernet. The host computer can control the BOOST boost circuit through the control board U1 to boost the voltage and output single pulse, double pulse and multiple pulses.

2. The power module test platform device according to claim 1, characterized in that: The IGBT module includes a switch tube Q1 and a diode D1. The driving board P1 is connected to the base of the switch tube Q1. The emitter of the switch tube Q1 is grounded. The collector of the switch tube Q1 is connected to the positive electrode of the diode D1 in parallel with the boost inductor L1. The cathode of the diode D1 is connected to the DC support capacitor C2.

3. The power module test platform device according to claim 2, characterized in that: The DC support capacitor C2 is connected to a power inductor L2, a power inductor L3, a power resistor R1 and a power resistor R2 for double pulse testing. The power inductor L2 is connected in series with the power inductor L3, and the power resistor R1 is connected in series with the power resistor R2.

4. The power module test platform device according to claim 1, characterized in that: The control circuit also includes an alarm device, which reminds and warns by emitting sound and light signals.

5. The power module test platform device according to claim 1, characterized in that: The control circuit also includes an emergency stop device, which can be manually pressed to quickly and reliably cut off power.

6. The power module test platform device according to claim 1, characterized in that: The total input power supply is also connected to a socket strip, which provides voltage to a voltage power probe, a current power probe, an oscilloscope, and a host computer.

7. The power module test platform device according to claim 1, characterized in that: The switching power supply S1 outputs 110 VDC, and the switching power supply S2 outputs 24 VDC.

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