Pulse detection equipment for power modules in rail transit systems

Abstract

The utility model discloses a pulse detection device for a power module of a rail transit system, comprising: a power supply device, a load device, and a control device. The power supply device comprises: a voltage source, a plurality of contactors, a plurality of voltage sensors, and a plurality of current sensors. The power supply device is electrically connected to the input end of the power module under test, and is used to provide voltage to the power module under test and collect corresponding voltage and current values ​​in real time. The load device comprises: a plurality of contactors, a plurality of voltage sensors, and a plurality of current sensors. The load device is electrically connected to the output end of the power module under test, and is used to select any power electronic device in the power module under test for pulse detection and collect corresponding voltage and current values ​​in real time. The control device is used to control the on and off of the contactor, receive the collected voltage and current values, and send pulses to the power electronic device under test for testing. The utility model has high detection efficiency and good detection effect.

Description

Technical Field

[0001] The utility model belongs to the technical field of rail transit subway detection, and in particular relates to a pulse detection device for a power module of a rail transit system. Background Art

[0002] The three core systems of urban rail transit subway are traction system, auxiliary system and network system. The main function of the traction system is to convert the 1500V DC power of the contact network into voltage and frequency adjustable (VVVF) AC power through pulse width modulation (PWM) when the train is being pulled, and supply power to the three-phase AC motor, thereby realizing the control of the train running speed; the auxiliary system mainly provides working power for all other equipment of the train except the traction motor, such as 380VAC required by air conditioners and air compressors, 220VAC required by lighting, video and other systems, and 110VDC power required by other 110VDC equipment.

[0003] As the number of subway trains increases and their operating years increase, the number of trains entering overhaul is increasing. Equipment for pulse detection of power modules in traction systems and auxiliary systems in rail transit systems has always been in short supply. Utility Model Content

[0004] In order to solve the above technical problems, the utility model proposes a pulse detection device for a power module of a rail transit system.

[0005] In order to achieve the above object, the technical solution of the utility model is as follows:

[0006] The utility model discloses a pulse detection device for a power module of a rail transit system, the pulse detection device is used to perform pulse detection for the power module to be tested, and the power module to be tested is a three-phase inverter bridge circuit;

[0007] Pulse detection equipment includes:

[0008] A power supply device, the power supply device includes: a voltage source, a plurality of contactors, a plurality of voltage sensors and a plurality of current sensors. The power supply device is electrically connected to the input end of the power module under test, and is used to provide voltage to the power module under test, collect corresponding voltage and current values ​​in real time, and send them to the control device;

[0009] A load device, the load device includes: a plurality of contactors, a plurality of voltage sensors and a plurality of current sensors, the load device is electrically connected to the output end of the power module under test, and is used to select any power electronic device in the power module under test for pulse detection, collect corresponding voltage and current values ​​in real time, and send them to the control device;

[0010] The control device is used to control the on and off of the contactor, receive the collected voltage and current values, and send pulses to the power electronic device under test for testing.

[0011] Based on the above technical solution, the following improvements can be made:

[0012] As a preferred solution, the power supply device includes: a voltage source, a main contactor K1, a line contactor K2, a pre-charge contactor K3, a discharge contactor K4, a pre-charge resistor R1, a discharge resistor R2 and an energy storage capacitor Cx;

[0013] The positive electrode and the negative electrode of the voltage source are electrically connected to the L1 terminal and the L2 terminal of the main contactor K1 respectively;

[0014] The T1 terminal of the main contactor K1, the parallel subcircuit, the series subcircuit, and the T2 terminal of the main contactor K1 are electrically connected in sequence to form a power supply circuit;

[0015] The parallel subcircuit includes: a pre-charging circuit and a line contactor K2 arranged in parallel, and the pre-charging circuit includes: a pre-charging contactor K3 and a pre-charging resistor R1 connected in series;

[0016] The series subcircuit includes: a discharge contactor K4 and a discharge resistor R2 arranged in series, and the two ends of the series subcircuit are respectively electrically connected to the positive electrode and the negative electrode of the power module under test;

[0017] The energy storage capacitor Cx is connected in parallel to both ends of the series sub-circuit.

[0018] As a preferred solution, the power supply device further includes: a voltage sensor V1, a voltage sensor V2 and a current sensor V3;

[0019] The two ends of the voltage sensor V1 are electrically connected to the T1 end and the T2 end of the main contactor K1 respectively;

[0020] Two ends of the voltage sensor V2 are electrically connected to two ends of the series sub-circuit respectively;

[0021] The current sensor V3 is connected in series in the power supply circuit;

[0022] The voltage sensor V1 , the voltage sensor V2 , and the current sensor V3 are all connected to the control device for communication.

[0023] As a preferred solution, the voltage source includes: an AC input power supply and a voltage conversion module, wherein the voltage conversion module is used to convert the AC power of the AC input power supply into DC power of any voltage value and output it.

[0024] As a preferred solution, the load device includes: a plurality of channel selection contactors, a plurality of bridge arm selection contactors and an inductive load L1.

[0025] As a preferred solution, the load device further includes: a current sensor V4 and a voltage sampling module V5, wherein the current sensor V4 and the voltage sampling module V5 are respectively used to collect the current and voltage values ​​of the inductive load L1.

[0026] As a preferred solution, the voltage sampling module V5 includes: an isolation power supply circuit, a real-time sampling circuit, and a sampling conversion circuit;

[0027] The isolated power supply is used to provide the sampling and conversion circuit with the power required for operation;

[0028] The real-time sampling circuit is used to convert the high-voltage signal of the circuit under test into a voltage signal that can be accepted by the sampling conversion circuit in real time and in proportion;

[0029] The sampling conversion circuit is used to isolate and convert the collected real-time voltage signal into a voltage analog signal that can be accepted by the control device.

[0030] As a preferred solution, the control device includes:

[0031] A human-machine interaction device, which is communicatively connected with the detection controller and is used to realize human-machine interaction;

[0032] A detection controller, which is connected to the human-machine interaction device and the drive controller through data lines, and is used to receive control instructions from the human-machine interaction device and control the on and off of the corresponding contactor;

[0033] Drive controller, which is used to realize central control;

[0034] The power module is used to provide the required working power for the human-machine interaction device, the detection controller and the drive controller.

[0035] As a preferred solution, the drive controller includes: an MCU control unit and a sensor feedback unit, a pulse trigger and a fault feedback unit electrically connected to the MCU control unit respectively;

[0036] The MCU control unit is used to drive the power electronic devices of the power module under test and perform pulse testing on it;

[0037] The sensor feedback unit is used to receive the collected voltage and current values ​​and send them to the MCU control unit;

[0038] The pulse trigger is used to convert the pulse signal sent by the MCU control unit into the level required to drive the power electronic device under test;

[0039] The fault feedback unit is used to collect feedback data from the tested power electronic device, convert it into a level acceptable to the MCU control unit, and send it to the MCU control unit.

[0040] As a preferred solution, the control device also includes:

[0041] The monitoring and display unit is connected to the drive controller for real-time display of monitoring data and abnormal alarm data of the power module under test.

[0042] The utility model discloses a pulse detection device for a power module of a rail transit system, which can perform pulse offline comprehensive detection on the power module of the rail transit system, mainly pulse load detection, with high detection efficiency and good detection effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0044] Figure 1 This is a principle block diagram of a pulse detection device provided in an embodiment of the utility model.

[0045] Figure 2 A circuit diagram of a power supply device provided in an embodiment of the utility model.

[0046] Figure 3 A circuit diagram of a power module under test provided in an embodiment of the utility model.

[0047] Figure 4 A circuit diagram of a load device provided in an embodiment of the utility model.

[0048] Figure 5 A specific principle block diagram of the control device provided in an embodiment of the utility model.

[0049] Figure 6 A circuit diagram of an isolated power supply circuit provided in an embodiment of the utility model.

[0050] Figure 7 A circuit diagram of a real-time sampling circuit provided in an embodiment of the utility model.

[0051] Figure 8 A circuit diagram of a sampling conversion circuit provided in an embodiment of the utility model.

[0052] Fig. 9 A circuit diagram of a sensor feedback unit provided in an embodiment of the present utility model.

[0053] Fig.10 A circuit diagram of a pulse trigger provided in an embodiment of the utility model.

[0054] Fig.11 A power supply diagram of a pulse trigger provided in an embodiment of the present utility model.

[0055] Fig.12 A circuit diagram of a fault feedback unit provided in an embodiment of the utility model.

[0056] Fig.13 A schematic diagram of a double pulse signal provided in an embodiment of the utility model.

[0057] Among them: 1-power module under test, 2-power supply device, 3-load device, 4-control device. DETAILED DESCRIPTION

[0058] The preferred embodiments of the present utility model are described in detail below with reference to the accompanying drawings.

[0059] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0060] In addition, the expression of “comprising” an element is an “open” expression, which simply means that a corresponding component exists, and should not be interpreted as excluding additional components.

[0061] In order to achieve the purpose of the utility model, in some embodiments of a pulse detection device for a power module of a rail transit system, the pulse detection device is used to perform pulse detection on a power module 1 under test, and the power module 1 under test is a three-phase inverter bridge circuit.

[0062] like Figure 1-5 As shown, the pulse detection device includes: a power supply device 2, a load device 3 and a control device 4.

[0063] The power supply device 2 includes: a voltage source, several contactors, several voltage sensors and several current sensors. The power supply device 2 is electrically connected to the input end of the power module 1 under test, and is used to provide voltage to the power module 1 under test, collect corresponding voltage and current values ​​in real time, and send them to the control device 4.

[0064] The load device 3 includes: a plurality of contactors, a plurality of voltage sensors and a plurality of current sensors. The load device 3 is electrically connected to the output end of the power module 1 under test, and is used to select any power electronic device (such as IGBT, GTO, etc.) in the power module 1 under test for pulse detection, collect the corresponding voltage and current values ​​in real time, and send them to the control device 4.

[0065] The control device 4 is used to control the on and off of the contactor, receive the collected voltage and current values, and send pulses to the power electronic device under test for testing.

[0066] Each device is described in detail below, and this embodiment takes IGBT testing as an example.

[0067] In some embodiments, the power supply device 2 includes: a voltage source, a main contactor K1, a line contactor K2, a pre-charging contactor K3, a discharge contactor K4, a pre-charging resistor R1, a discharge resistor R2, a storage capacitor Cx, a voltage sensor V1, a voltage sensor V2 and a current sensor V3.

[0068] The voltage source includes: an AC input power supply and a voltage conversion module. The voltage conversion module is used to convert the AC power of the AC input power supply into a DC power of any voltage value and output it.

[0069] The voltage conversion module may select a DC power supply unit P1, which receives an external input of 380VAC and provides an arbitrarily adjustable DC power output of 0 to 2KVDC after conversion.

[0070] The positive electrode and the negative electrode of the voltage source are electrically connected to the L1 terminal and the L2 terminal of the main contactor K1 respectively;

[0071] The T1 terminal of the main contactor K1, the parallel subcircuit, the series subcircuit, and the T2 terminal of the main contactor K1 are electrically connected in sequence to form a power supply circuit;

[0072] The parallel subcircuit includes: a pre-charging circuit and a line contactor K2 arranged in parallel, and the pre-charging circuit includes: a pre-charging contactor K3 and a pre-charging resistor R1 connected in series;

[0073] The series subcircuit includes: a discharge contactor K4 and a discharge resistor R2 arranged in series, and the two ends of the series subcircuit are respectively electrically connected to the positive electrode and the negative electrode of the power module 1 under test;

[0074] The energy storage capacitor Cx is connected in parallel to both ends of the series sub-circuit.

[0075] The two ends of the voltage sensor V1 are electrically connected to the T1 end and the T2 end of the main contactor K1 respectively;

[0076] Two ends of the voltage sensor V2 are electrically connected to two ends of the series sub-circuit respectively;

[0077] The current sensor V3 is connected in series in the power supply circuit;

[0078] The voltage sensor V1 , the voltage sensor V2 , and the current sensor V3 are all connected to the control device 4 for communication.

[0079] The main contactor K1, line contactor K2, pre-charge contactor K3, pre-charge resistor R1, and energy storage capacitor Cx constitute a power output control network, which controls the transmission and shutoff of the DC power supply to the outside.

[0080] The above-mentioned discharge contactor K4 and discharge resistor R2 constitute a safe discharge network, which serves to provide a discharge circuit for the electric energy stored in the bus capacitor after power failure.

[0081] The voltage sensor V1 , the voltage sensor V2 and the current sensor V3 constitute a power supply system detection network, which functions to detect the power supply voltage and current in real time and provide judgment data for the control of the control device 4 .

[0082] In some embodiments, the load device 3 includes: a plurality of channel selection contactors, a plurality of bridge arm selection contactors, an inductive load L1 , a current sensor V4 , and a voltage sampling module V5 .

[0083] Specifically include: channel selection contactor K BR, channel selection contactor KU, channel selection contactor K_V, channel selection contactor K_W, bridge arm selection contactor K_VP, bridge arm selection contactor K_VN, etc.

[0084] The current sensor V4 and the voltage sampling module V5 are used to collect the current and voltage values ​​of the inductive load L1 respectively.

[0085] Specifically, the voltage sampling module V5 includes: an isolation power supply circuit, a real-time sampling circuit, and a sampling conversion circuit;

[0086] The isolated power supply is used to provide the sampling and conversion circuit with the required power supply, such as Figure 6 As shown;

[0087] The real-time sampling circuit is used to convert the high-voltage signal of the circuit under test into a voltage signal that can be accepted by the sampling conversion circuit in real time. Figure 7 As shown;

[0088] The sampling conversion circuit is used to isolate and convert the collected real-time voltage signal into a voltage analog signal that can be accepted by the control device, such as Figure 8 shown.

[0089] In some embodiments, the control device 4 includes: a human-computer interaction device, a detection controller, a drive controller, and a power module.

[0090] The human-machine interaction device may be, but is not limited to, a text display (HMI); the detection controller may be, but is not limited to, a programmable controller (PLC).

[0091] The human-machine interface (HMI) and programmable controller (PLC) exchange data via the RS232 serial port to control the on and off of each contactor in real time, and monitor and display the feedback data of the operating status of each component and various abnormal alarm indications in real time.

[0092] The detection controller is connected to the human-machine interaction device and the drive controller through data lines respectively, and is used to receive control instructions from the human-machine interaction device and control the on and off of the corresponding contactor.

[0093] The programmable controller (PLC) serves as a transfer station between the text display (HMI) and the power module under test. It receives control instructions from the text display (HMI), controls the on and off of the controlled contactors (K1, K2, K3, K4, K_BR, K_U, K_V, K_W, K_VP, K_VN), and transmits the status feedback signal of the controlled contactor back to the text display (HMI) for display.

[0094] The power module is used to provide the required working power for the human-machine interaction device, the detection controller and the drive controller.

[0095] Specifically, the drive controller includes: an MCU control unit, and a sensor feedback unit, a pulse trigger, and a fault feedback unit electrically connected to the MCU control unit respectively.

[0096] As the main core component, the MCU control unit controls 7 independent single / double pulse signals to drive the power electronic devices of the power module under test, thereby realizing single / double pulse testing of each power electronic device of the module under test.

[0097] The sensor feedback unit is used to receive the collected voltage and current values ​​and send them to the MCU control unit, such as Fig. 9 shown.

[0098] This circuit is compatible with the sampling of feedback signals from sensors with two output types, voltage and current. By adjusting the resistance values ​​of R3, R5, and R7, it can adapt to the sampling of current feedback signals of different signals; when the resistances of R3, R5, and R7 are removed and the resistance values ​​of R9, R10, R13, R14, and R17 are adjusted at the same time, it can adapt to the sampling of voltage feedback signals of different signals. In addition, when the sensor collects AC signals, just leave R28 suspended and install 0Ω resistor in R27; conversely, when the sensor collects DC signals, just leave R27 suspended and install 0Ω resistor in R28. V_BIAS_ADC is the sampling reference voltage source.

[0099] The pulse trigger is used to convert the pulse signal sent by the MCU control unit into the level required to drive the power electronic device under test, such as Figure 10-11 shown.

[0100] The fault feedback unit is used to collect the feedback data of the power electronic device under test, convert it into a level acceptable to the MCU control unit, and send it to the MCU control unit. Fig.12 shown.

[0101] Furthermore, the control device 4 further includes: a monitoring display unit. The monitoring display unit may be, but is not limited to, a computer.

[0102] The monitoring and display unit is connected to the drive controller for communication and data exchange via WiFi, and is used to display the monitoring data and abnormal alarm data of the tested power module in real time.

[0103] The following takes the detection of the U-phase upper bridge IGBT (UU) of the power module under test as an example to illustrate the working process of the present invention. The detection processes of other IGBTs are similar.

[0104] The workflow specifically includes the following steps:

[0105] First, the main contactor K1 is controlled to be closed, and high-voltage DC power is supplied to the next stage.

[0106] During this process, the main contactor K1 transmits its "normal closure" signal back to the MCU control unit through a set of normally open auxiliary switches, and the voltage sensor V1 transmits the real-time detected voltage signal to the MCU control unit. If the MCU control unit detects that any of the above two sets of signals is abnormal, all subsequent input instructions will be invalid, and the corresponding fault indication will be displayed on the human-computer interaction device.

[0107] Second, control the pre-charging contactor K3 to be energized, and the pre-charging contactor K3 and the pre-charging contactor R1 charge the energy storage capacitor Cx. When the voltage across the energy storage capacitor Cx rises to the set value of the MCU control unit, the pre-charging contactor K3 is disconnected and the line contactor K2 is energized, and the entire pre-charging process is completed.

[0108] During this process, the line contactor K2 and the pre-charging contactor K3 transmit their "normal closure" signals to the MCU control unit through their respective sets of normally open auxiliary switches, and the voltage sensor V2 transmits the real-time detected voltage signal to the MCU control unit. If the MCU control unit detects that any of the above two sets of signals is abnormal, all subsequent input instructions will be invalid, and the corresponding fault indication will be displayed on the human-computer interaction device.

[0109] Third, the control channel selection contactor K_U and the bridge arm selection contactor K_VN are energized (when the IGBT (UU) is turned on, the bus VP voltage flows into the bus VN via UU→K_U→L1→K_VN).

[0110] During this process, the channel selection contactor K_U and the bridge arm selection contactor K_VN transmit their "normal closure" signals back to the MCU control unit through their respective sets of normally open auxiliary switches. If the MCU control unit detects that any of the above two sets of signals is abnormal, all subsequent input instructions will be invalid, and the corresponding fault indication will be displayed on the human-computer interaction device.

[0111] Fourth, the line contactor K2 is disconnected first, and its normally open auxiliary switch is also disconnected. The MCU control unit detects the state of the line contactor K2 and the voltage value on the energy storage capacitor Cx in real time through this auxiliary switch and the voltage sensor V2.

[0112] If the line contactor K2 is not disconnected or the voltage value on the energy storage capacitor Cx is lower than the threshold value set by the MCU control unit, the MCU control unit stops sending the pulse signal.

[0113] Only when the above conditions are met, the MCU control unit will send the following Fig.13 The double pulse (Vge) shown in the figure sends a low level (Vge = 0V) to other IGBTs at the same time, so that other IGBTs are always in the off state during the test to ensure that there is no through-circuit phenomenon. The MCU control unit collects the voltage (Vce) and current signal (Ic) on the IGBT under test in real time through the current sensor V4 and the voltage sampling module V5. Fig.13 shown.

[0114] Fifth, after the above test is completed, the main contactor K1, the channel selection contactor K_U and the bridge arm selection contactor K_VN are reset, and the discharge contactor K4 is controlled to be attracted, so as to discharge the energy stored in the energy storage capacitor Cx and the capacitor in the power module under test through the discharge resistor R2.

[0115] When the MCU control unit detects that the voltage value on the voltage sensor V2 is lower than the set safety voltage value, the discharge contactor K4 is controlled to reset.

[0116] The utility model discloses a pulse detection device for a power module of a rail transit system, which can perform pulse offline comprehensive detection on the power module of the rail transit system, mainly pulse load detection, with high detection efficiency and good detection effect.

[0117] The utility model adds a new detection item point to the power module to be tested, thereby improving the repair rate of the power module to be tested.

[0118] In the description of the present invention, it should be understood that the terms "coaxial", "bottom", "one end", "top", "middle", "the other end", "upper", "one side", "top", "inside", "front", "center", "both ends" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and 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 orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0119] In the present utility model, unless otherwise clearly stipulated and limited, the terms such as "installation", "setting", "connection", "fixation" and "screw-on" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated 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 the internal connection of two elements or the interaction relationship between two elements. Unless otherwise clearly defined, ordinary technicians in this field can understand the specific meanings of the above terms in the utility model according to the specific circumstances.

[0120] The above shows and describes the basic principles and main features of the utility model and the advantages of the utility model. Those skilled in the art should understand that the utility model is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which shall fall within the scope of the utility model to be protected. The scope of protection of the utility model shall be defined by the attached claims and their equivalents.

[0121] The control method of the present invention is to control by manually starting and closing the switch. The wiring diagram of the power element and the provision of power supply are common knowledge in the field, and the present invention is mainly used to protect mechanical devices, so the present invention will not explain the control method and wiring arrangement in detail.

Claims

1. A pulse detection device for a power module of a rail transit system, characterized in that: The pulse detection device is used to perform pulse detection on the power module under test, and the power module under test is a three-phase inverter bridge circuit; The pulse detection device comprises: A power supply device, the power supply device comprising: a voltage source, a plurality of contactors, a plurality of voltage sensors and a plurality of current sensors, the power supply device being electrically connected to the input end of the power module under test, for providing voltage to the power module under test, collecting corresponding voltage and current values ​​in real time, and sending them to the control device; A load device, comprising: a plurality of contactors, a plurality of voltage sensors and a plurality of current sensors, the load device being electrically connected to the output end of the power module under test, and being used to select any power electronic device in the power module under test for pulse detection, collect corresponding voltage and current values ​​in real time, and send them to the control device; The control device is used to control the on and off of the contactor, receive the collected voltage and current values, and send pulses to the power electronic device under test for testing.

2. The pulse detection device according to claim 1, characterized in that The power supply device comprises: a voltage source, a main contactor K1, a line contactor K2, a pre-charging contactor K3, a discharge contactor K4, a pre-charging resistor R1, a discharge resistor R2 and an energy storage capacitor Cx; The positive electrode and the negative electrode of the voltage source are electrically connected to the L1 terminal and the L2 terminal of the main contactor K1 respectively; The T1 terminal of the main contactor K1, the parallel subcircuit, the series subcircuit, and the T2 terminal of the main contactor K1 are electrically connected in sequence to form a power supply circuit; The parallel subcircuit comprises: a pre-charging circuit and a line contactor K2 arranged in parallel, and the pre-charging circuit comprises: a pre-charging contactor K3 and a pre-charging resistor R1 connected in series; The series subcircuit comprises: a discharge contactor K4 and a discharge resistor R2 arranged in series, and the two ends of the series subcircuit are respectively electrically connected to the positive electrode and the negative electrode of the power module under test; The energy storage capacitor Cx is connected in parallel to both ends of the series sub-circuit.

3. The pulse detection device according to claim 2, characterized in that The power supply device further includes: a voltage sensor V1, a voltage sensor V2 and a current sensor V3; The two ends of the voltage sensor V1 are electrically connected to the T1 end and the T2 end of the main contactor K1 respectively; The two ends of the voltage sensor V2 are electrically connected to the two ends of the series sub-circuit respectively; The current sensor V3 is connected in series in the power supply circuit; The voltage sensor V1 , the voltage sensor V2 and the current sensor V3 are all in communication connection with the control device.

4. The pulse detection device according to claim 1, characterized in that The voltage source includes: an AC input power supply and a voltage conversion module. The voltage conversion module is used to convert the AC power of the AC input power supply into a DC power of any voltage value and output it.

5. The pulse detection device according to claim 1, characterized in that The load device includes: a plurality of channel selection contactors, a plurality of bridge arm selection contactors and an inductive load L1.

6. The pulse detection device according to claim 5, characterized in that The load device further includes: a current sensor V4 and a voltage sampling module V5, wherein the current sensor V4 and the voltage sampling module V5 are used to collect the current and voltage values ​​of the inductive load L1 respectively.

7. The pulse detection device according to claim 6, characterized in that The voltage sampling module V5 includes: an isolation power supply circuit, a real-time sampling circuit, and a sampling conversion circuit; The isolated power supply is used to provide the sampling and conversion circuit with the power required for operation; The real-time sampling circuit is used to convert the high-voltage signal of the circuit under test into a voltage signal that can be accepted by the sampling conversion circuit in real time and in equal proportion; The sampling conversion circuit is used to isolate and convert the collected real-time voltage signal into a voltage analog signal that can be accepted by the control device.

8. The pulse detection device according to claim 1, characterized in that The control device comprises: A human-computer interaction device, which is communicatively connected with the detection controller and is used to realize human-computer interaction; A detection controller, which is connected to the human-machine interaction device and the drive controller through data lines, and is used to receive control instructions from the human-machine interaction device and control the on and off of the corresponding contactor; A drive controller, wherein the drive controller is used to implement central control; A power supply module is used to provide the required working power to the human-machine interaction device, the detection controller and the drive controller.

9. The pulse detection device according to claim 8, characterized in that The drive controller includes: an MCU control unit and a sensor feedback unit, a pulse trigger and a fault feedback unit electrically connected to the MCU control unit respectively; The MCU control unit is used to drive the power electronic device of the power module under test and perform a pulse test on it; The sensor feedback unit is used to receive the collected voltage and current values ​​and send them to the MCU control unit; The pulse trigger is used to convert the pulse signal sent by the MCU control unit into the level required for driving the power electronic device under test; The fault feedback unit is used to collect feedback data of the tested power electronic device, convert it into a level acceptable to the MCU control unit, and send it to the MCU control unit.

10. The pulse detection device according to claim 9, characterized in that The control device also includes: The monitoring and display unit is connected to the drive controller for displaying the monitoring data and abnormal alarm data of the power module under test in real time.

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