Railway passenger car undercarriage power supply test and repair platform

Abstract

A railway passenger car under power test maintenance platform relates to a railway passenger car electrical equipment maintenance device, in order to solve the problem that the on-site maintenance process is complicated, the operation amount is large, and the repeated lifting and loading is easy to cause equipment damage. The first voltage conversion unit is used for providing 110V DC power for the second under power; the second voltage conversion unit is used for providing 600V DC power for the first under power and the second under power; the controller circuit is used for receiving the feedback information of the first under power and the feedback information of the second under power, and outputting the feedback result; the first detection cabinet is provided with a first load, and the first load is used for load testing of the first under power; the second detection cabinet is provided with a second load; and the second load is used for load testing of the second under power. The beneficial effect is to judge whether the passenger car under power is qualified; the equipment that passes the maintenance is transported to the scene for whole machine replacement, and the on-site operation efficiency is improved several times.

Description

Technical Field

[0001] This utility model relates to a maintenance device for electrical equipment in railway passenger cars. Background Technology

[0002] With the continuous development of railway passenger car technology and the constant innovation of railway passenger car equipment, the application of undercarriage power supply devices for railway passenger cars has gradually become a new normal for enterprises to upgrade their transportation equipment. The undercarriage power supply of railway passenger cars is an important component of the railway passenger car electrical system, mainly used to provide power support for various equipment on the railway passenger car. The undercarriage power supply of railway passenger cars mainly includes a first undercarriage power supply unit and a second undercarriage power supply unit. The inverter power supply box of the first undercarriage power supply unit has two separate 35kVA inverter modules built in, which invert the DC 600V DC voltage into a three-phase AC PWM voltage, and obtain a quasi-sine wave after passing through a three-phase filter and an EMI output filter, to provide AC 380V / 50Hz power to the air conditioning unit. The second undercarriage power supply unit includes a charger and a single-phase inverter. The charger provides charging power to the vehicle's battery device, and also supplies power to the on-board lighting and control cabinet. The single-phase inverter is used to provide power support for single-phase equipment on the passenger car, ensuring that the single-phase equipment can operate normally. The application of railway passenger car electrical testing equipment in maintenance technology is gradually becoming more widespread, and the rapidly growing demand for railway passenger car equipment has placed higher requirements on the maintenance technology of railway passenger car equipment. The existing maintenance technology is no longer able to meet the new demands. Due to limitations imposed by factors such as in-depot technical maintenance time, operating environment, and personnel, the existing undercarriage power supply equipment weighs over 100 kilograms. In practice, troubleshooting requires 5-6 people, and each time a part is replaced, the undercarriage power supply equipment must be disassembled and reassembled, which takes several hours and may still not meet the quality standards for leaving the depot. To address this issue, it is necessary to actively develop an undercarriage power supply maintenance device to improve on-site operation efficiency and ensure on-time departure, which is the current development direction.

[0003] Currently, under-vehicle power supply maintenance requires on-site inspection, which is cumbersome, labor-intensive, and prone to equipment damage and personal injury risks due to repeated lifting and loading. Given the increasing demands of on-site operations, the only solution is to increase manpower. However, due to space limitations, current technology cannot accurately measure with instruments. Therefore, the only option is to repeatedly replace parts; however, repeated parts replacement is inefficient. This not only incurs significant labor and time costs but also poses certain safety risks. Utility Model Content

[0004] The purpose of this utility model is to solve the problems of cumbersome on-site maintenance procedures, large workload, and equipment damage caused by repeated lifting and loading. It proposes a power supply testing and maintenance platform under railway passenger cars.

[0005] The railway passenger car undercarriage power supply test and maintenance platform of this utility model includes a control cabinet, a first testing cabinet and a second testing cabinet;

[0006] The control cabinet is equipped with a control unit, a first voltage conversion unit, and a second voltage conversion unit; the first voltage conversion unit is used to provide 110V DC power to the second vehicle under-supplier; the second voltage conversion unit is used to provide 600V DC power to both the first and second vehicle under-suppliers; the control unit is used to receive feedback voltage from the first and second vehicle under-suppliers and output it.

[0007] The first testing cabinet is used to perform load testing on the power supply under the first vehicle.

[0008] The second testing cabinet is used to perform load testing on the power supply of the second vehicle.

[0009] Furthermore, the first voltage conversion unit includes a first power converter T1, a switch SA1, a switch SA2, and a first relay KM1;

[0010] The first power converter T1 is used to convert 380V AC power to 110V DC power; the positive terminal of the first power converter T1 is connected to one end of switch SA2; the other end of switch SA2 is connected to one end of switch SA1 and the 110V positive terminal of the second vehicle power supply; the other end of switch SA1 is connected to one end of the coil of the first relay KM1; the negative terminal of the first power converter T1 is connected to the other end of the coil of the first relay KM1 and the 110V negative terminal of the second vehicle power supply.

[0011] Furthermore, the second voltage conversion unit includes a second power converter T2;

[0012] The first relay KM1 has a switch consisting of a first switch and a second switch, and the first switch and the second switch constitute a double-pole single-throw switch.

[0013] The second power converter T2 is used to convert 380V AC power to 600V DC power; the positive terminal of the second power converter T2 is connected to one end of the first relay KM1 switch number one, and the other end of the first relay KM1 switch number one is simultaneously connected to the 600V positive terminal of the second vehicle power supply and the 600V positive terminal of the first vehicle power supply; the negative terminal of the second power converter T2 is connected to one end of the first relay KM1 switch number two, and the other end of the first relay KM1 switch number two is simultaneously connected to the 600V negative terminal of the second vehicle power supply and the 600V negative terminal of the first vehicle power supply.

[0014] Furthermore, the control unit includes a PLC controller, an adapter, and a PLC gateway;

[0015] The LW1A interface of the PLC gateway is connected to the gateway interface of the first vehicle under-power supply; the LW2A interface of the PLC gateway is connected to the gateway interface of the second vehicle under-power supply; the PLC gateway transmits the operating condition information of the first and second vehicle under-power supplies to the PLC controller through the adapter; the PLC controller generates feedback results based on the operating condition information of the first and second vehicle under-power supplies.

[0016] Furthermore, it also includes display devices;

[0017] The display device is used to display the feedback voltage output by the PLC controller.

[0018] Furthermore, the second vehicle power supply includes a charger, a single-phase inverter, filters Z1, Z2, Z3, and Z4, a third transformer T3, a first current protector F1, and a second current protector F2.

[0019] The +140 port of the single-phase inverter is connected to the other end of the switch SA2 through filter Z1; the -140 port of the single-phase inverter is connected to the negative terminal of the first power converter T1 through filter Z1; the U210 port of the single-phase inverter is connected to one end of the primary coil of the third transformer T3; the N210 port of the single-phase inverter is connected to the other end of the primary coil of the third transformer T3; the secondary coil of the third transformer T3 outputs 220V AC mains power through filter Z4.

[0020] The +603 port of the charger is connected to one end of the first current protector F1 through filter Z3, and the other end of the first current protector F1 is connected to the other end of the first relay KM1 switch number one; the -603 port of the charger is connected to the other end of the first relay KM1 switch number two through filter Z3.

[0021] The +110 port of the charger is connected to one end of the second current protector F2, and the other end of the second current protector F2 is connected to the other end of the switch SA2; the D+ port of the charger is connected to one load terminal of the second detection cabinet; the D01+ port of the charger is connected to another load terminal of the second detection cabinet through the filter Z2; the D01- port of the charger is connected to the negative terminal of the first power converter T1 through the filter Z2.

[0022] Compared with the prior art, the present invention has the following advantages:

[0023] The railway passenger car undercarriage power supply testing and maintenance platform provides a one-stop solution for testing and maintenance of railway passenger car undercarriage power supply devices. Features include: simple operation, strong sensory feedback on test results, and no need for special external equipment. Key performance indicators: Before using the platform, on-site maintenance of undercarriage power supply devices required significant manpower, was limited by space constraints, lacked accurate instrument measurement, and involved repeated parts replacement, resulting in low efficiency. This not only incurred substantial manpower and time costs but also posed certain safety risks. With the platform, the quality of undercarriage power supply devices can be directly assessed; qualified equipment can be transported to the site for complete replacement, increasing on-site work efficiency several times over. Now, three people can complete the task within one hour. This improves on-site personnel utilization, maintenance quality pass rate, and ensures a high rate of devices leaving the warehouse in good working order. Attached Figure Description

[0024] Figure 1 This is a block diagram illustrating the control principle of a power supply testing and maintenance platform for railway passenger cars, as described in Specific Implementation Method 1.

[0025] Figure 2 This is a circuit diagram of the first voltage conversion unit in the second specific implementation method;

[0026] Figure 3 This is a circuit diagram of the second voltage conversion unit in the third specific implementation method;

[0027] Figure 4 This is a circuit diagram of the control unit in Specific Implementation Method Four;

[0028] Figure 5 This is a circuit diagram of the power supply for the second vehicle in Specific Implementation Method Six. Detailed Implementation

[0029] Specific Implementation Method 1: Combination Figure 1 This embodiment describes a railway passenger car undercarriage power supply testing and maintenance platform, which includes a control cabinet 1, a first testing cabinet, and a second testing cabinet.

[0030] The control cabinet 1 is equipped with a control unit, a first voltage conversion unit, and a second voltage conversion unit; the first voltage conversion unit is used to provide 110V DC power to the second under-vehicle power supply 3; the second voltage conversion unit is used to provide 600V DC power to the first under-vehicle power supply 2 and the second under-vehicle power supply 3; the control unit is used to receive the feedback voltage from the first under-vehicle power supply 2 and the feedback voltage from the second under-vehicle power supply 3, and output the voltage.

[0031] The first testing cabinet is used to perform load testing on the first vehicle under-power supply 2;

[0032] The second testing cabinet is used to perform load testing on the second vehicle power supply 3.

[0033] In this embodiment, the first under-vehicle power supply 2 and the second under-vehicle power supply 3 constitute the under-vehicle power supply to be tested; the first testing cabinet is equipped with a first load 4, which is used to perform load testing on the first under-vehicle power supply 2; the second testing cabinet is equipped with a second load 5, which is used to perform load testing on the second under-vehicle power supply 3. The control cabinet 1 is used to control the working conditions of the first under-vehicle power supply 2 and the second under-vehicle power supply 3 and to transmit information between them. It is the test control and command center, providing the necessary working conditions for the first under-vehicle power supply 2 and the second under-vehicle power supply 3, providing protective protection against abnormal problems that occur during operation, and collecting feedback information from the first under-vehicle power supply 2 and the second under-vehicle power supply 3. Based on the displayed test data, it can guide maintenance personnel to perform subsequent processing operations on the test equipment; after receiving 600V DC power from the second voltage conversion unit, the first under-vehicle power supply 2... The system automatically completes the tests for each operating condition and automatically transmits the test results to the control unit. The first load 4 can activate the load condition as needed to perform load testing on the first under-vehicle power supply 2. The second under-vehicle power supply 3, after receiving 110V DC power from the first voltage conversion unit and 600V DC power from the second voltage conversion unit, automatically completes the tests for each operating condition and automatically transmits the test results to the control unit. The second load 5 can activate the load condition as needed to perform load testing on the second under-vehicle power supply 3. The control cabinet 1 and the first under-vehicle power supply 2 share a 10m... 2 Power wiring and communication transmission cables are connected; the first undercarriage power supply 2 and the first load 4 are connected by 10 m... 2 The power wiring is connected; the control cabinet 1 and the second vehicle under-power supply 3 are connected by a 10m... 2 Power wiring and communication transmission cables are connected; the second undercarriage power supply 3 and the second load 5 are connected by 10 m... 2 Connect the power wiring.

[0034] The first vehicle under-powered power supply 2 transmits information to the control unit. The second voltage conversion unit provides 600V DC power to the first vehicle under-powered power supply 2. The first vehicle under-powered power supply 2 starts running and feeds back the operating parameters to the control unit. The control unit and the first vehicle under-powered power supply 2 form an information transmission interlock relationship and enter an automatic control state. When a problem occurs, the operation of the first vehicle under-powered power supply 2 is stopped. It provides protective protection against abnormal problems that occur in the first vehicle under-powered power supply 2 during operation and collects the test feedback results of the first vehicle under-powered power supply 2. Based on the displayed test data, it can guide maintenance personnel to carry out subsequent processing operations on the test equipment.

[0035] When the load condition is started, the first load 4 is effectively connected to the first vehicle under-power supply 2, and the load test condition is entered. The power parameters are displayed on the display device. Based on the displayed power parameters, it can be determined whether the output condition of the first vehicle under-power supply 2 is normal. The displayed test data can guide maintenance personnel to carry out subsequent processing work on the test equipment.

[0036] The aforementioned railway passenger car undercarriage power supply testing and maintenance platform features an external AC380V 3-phase 4-wire input power supply, requiring no other facilities and operating continuously. It boasts 100% testing accuracy and improves on-site work efficiency by 200%. Energy consumption is 40KW. Control cabinet 1, the first testing cabinet, and the second testing cabinet all have iron casings. It provides one-stop service for on-site operations. Addressing the increasing demands of on-site operations, previous methods for repairing undercarriage power supplies involved significant manpower, limited space for accurate instrument measurements, repetitive parts replacement, and low efficiency. This approach not only incurred substantial manpower and time costs but also posed certain safety risks. Therefore, using the railway passenger car undercarriage power supply maintenance platform allows for the complete replacement of repaired equipment on-site, increasing on-site work efficiency several times over. Now, three people can complete the task within one hour. This improves on-site personnel utilization, maintenance quality pass rate, and ensures a high rate of equipment leaving the warehouse in good condition. The operating buttons and switches feature automation, overcurrent protection, and leakage protection functions, ensuring a high safety factor.

[0037] Specific Implementation Method Two: Combination Figure 2 This embodiment further defines the railway passenger car undercarriage power supply test and maintenance platform described in Specific Embodiment 1. In this embodiment, the first voltage conversion unit includes a first power converter T1, a switch SA1, a switch SA2, and a first relay KM1.

[0038] The first power converter T1 is used to convert 380V AC power to 110V DC power; the positive terminal of the first power converter T1 is connected to one end of switch SA2; the other end of switch SA2 is connected to one end of switch SA1 and the 110V positive terminal of the second vehicle power supply 3; the other end of switch SA1 is connected to one end of the coil of the first relay KM1; the negative terminal of the first power converter T1 is connected to the other end of the coil of the first relay KM1 and the 110V negative terminal of the second vehicle power supply 3.

[0039] In this embodiment, an indicator light H1 is connected in parallel across the coil of the first relay KM1. After the coil of the first relay KM1 is turned on, the indicator light H1 illuminates. An indicator light H2 is connected between the other end of the switch SA2 and the negative terminal of the first power converter T1. After the power supply of the external distribution cabinet is input to the control cabinet 1, the control cabinet 1 is in standby mode. The first power converter T1 is started to provide power for the control cabinet 1 under various operating conditions. The indicator light H2 illuminates, and at the same time, the voltage self-detection is completed, providing DC110V power to the second vehicle power supply 3.

[0040] Specific Implementation Method Three: Combination Figure 3 This embodiment further defines the railway passenger car undercarriage power supply test and maintenance platform described in Specific Embodiment 2. In this embodiment, the second voltage conversion unit includes a second power converter T2.

[0041] The first relay KM1 has a switch consisting of a first switch and a second switch, and the first switch and the second switch constitute a double-pole single-throw switch.

[0042] The second power converter T2 is used to convert 380V AC power to 600V DC power. The positive terminal of the second power converter T2 is connected to one end of the first relay KM1 switch number one, and the other end of the first relay KM1 switch number one is simultaneously connected to the 600V positive terminal of the second vehicle power supply 3 and the 600V positive terminal of the first vehicle power supply 2. The negative terminal of the second power converter T2 is connected to one end of the first relay KM1 switch number two, and the other end of the first relay KM1 switch number two is simultaneously connected to the 600V negative terminal of the second vehicle power supply 3 and the 600V negative terminal of the first vehicle power supply 2.

[0043] In this embodiment, the second power converter T2 is started, and the second power converter T2 is DC 600V. The load is in standby mode and completes voltage self-detection at the same time. When the SA1 switch is turned on, the coil of the first relay KM1 is energized, the double-pole single-throw switch of the first relay KM1 is energized, the normally open contact is turned on, and +600 and -600 are energized, providing 600V DC power to the first vehicle under-vehicle power supply 2 and the second vehicle under-vehicle power supply 3.

[0044] Detailed Implementation Method Four: Combination Figure 4 This embodiment further defines the railway passenger car undercarriage power supply test and maintenance platform described in Specific Embodiment 3. In this embodiment, the control unit includes a PLC controller, an adapter, and a PLC gateway.

[0045] The LW1A interface of the PLC gateway is connected to the gateway interface of the first vehicle under-power supply 2; the LW2A interface of the PLC gateway is connected to the gateway interface of the second vehicle under-power supply 3; the PLC gateway transmits the operating condition information of the first vehicle under-power supply 2 and the second vehicle under-power supply 3 to the PLC controller through the adapter; the PLC controller generates feedback results based on the operating condition information of the first vehicle under-power supply 2 and the second vehicle under-power supply 3.

[0046] In this embodiment, after the second vehicle under-power supply 3 is started, it controls the corresponding relay of the PLC controller through signal lines 211, 201, 301, 203, 303, 202, and 302 to transmit the working status of the second vehicle under-power supply 3 to the PLC controller. The voltage and current sensors convert the voltage and current into digital quantities and transmit them to the PLC controller.

[0047] Specific Implementation Method 5: This implementation method further defines the railway passenger car undercarriage power supply testing and maintenance platform described in Specific Implementation Method 4. In this implementation method, a display device is also included.

[0048] The display device is used to display the feedback voltage output by the PLC controller.

[0049] In this embodiment, the display device is used to display the feedback results output by the PLC controller, realizing intuitive visualization of the test results. This allows maintenance personnel to directly and in real time view the operating status information and test data of the power supply under the vehicle, thereby quickly determining whether the equipment is qualified and avoiding repeated disassembly and replacement of parts. It significantly improves maintenance efficiency, reduces human judgment errors, reduces labor costs and operational risks, and achieves the efficient goal of "3 people completing the work within 1 hour". It also ensures the quality and safety of outbound products and improves the standardization and intelligence level of on-site operations.

[0050] Specific Implementation Method Six: Combination Figure 5 This embodiment further defines the railway passenger car undercarriage power supply test and maintenance platform described in Specific Embodiment 4. In this embodiment, the second undercarriage power supply 3 includes a charger, a single-phase inverter, filters Z1, Z2, Z3, and Z4, a third transformer T3, a first current protector F1, and a second current protector F2.

[0051] The +140 port of the single-phase inverter is connected to the other end of the switch SA2 through filter Z1; the -140 port of the single-phase inverter is connected to the negative terminal of the first power converter T1 through filter Z1; the U210 port of the single-phase inverter is connected to one end of the primary coil of the third transformer T3; the N210 port of the single-phase inverter is connected to the other end of the primary coil of the third transformer T3; the secondary coil of the third transformer T3 outputs 220V AC mains power through filter Z4.

[0052] The +603 port of the charger is connected to one end of the first current protector F1 through filter Z3, and the other end of the first current protector F1 is connected to the other end of the first relay KM1 switch number one; the -603 port of the charger is connected to the other end of the first relay KM1 switch number two through filter Z3.

[0053] The +110 port of the charger is connected to one end of the second current protector F2, and the other end of the second current protector F2 is connected to the other end of the switch SA2; the D+ port of the charger is connected to one load terminal of the second detection cabinet; the D01+ port of the charger is connected to another load terminal of the second detection cabinet through the filter Z2; the D01- port of the charger is connected to the negative terminal of the first power converter T1 through the filter Z2.

[0054] In this embodiment, the second vehicle under-power supply 3 transmits information to the control unit. The control unit sends +110V and +600V+ commands to the second vehicle under-power supply 3 via the +140V and +603V lines, respectively. The second vehicle under-power supply 3 starts running and feeds back the operating parameters D+ and L+ to the control unit. The control unit and the second vehicle under-power supply 3 form an information transmission interlock relationship and enter an automatic control state. When a problem occurs, the operation of the second vehicle under-power supply 3 is stopped. This provides protective protection against abnormal problems that occur in the second vehicle under-power supply 3 during operation and collects the feedback results of the test of the second vehicle under-power supply 3. Based on the test data displayed by the PLC controller and display device, maintenance personnel can be guided to perform subsequent processing operations on the test equipment.

[0055] When starting the load condition, the second load 5 and the second under-vehicle power supply 3 are effectively connected through lines D+ and L+, entering the load test condition. The power parameters are displayed on the display device, and the output condition of the second under-vehicle power supply 3 is judged based on the data. The test data displayed by the PLC controller and the display device can guide maintenance personnel to perform subsequent processing operations on the test equipment.

[0056] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the protection scope of the claims.

Claims

1. A power supply testing and maintenance platform for railway passenger cars, characterized in that, Includes a control cabinet (1), a first testing cabinet, and a second testing cabinet; The control cabinet (1) is equipped with a control unit, a first voltage conversion unit and a second voltage conversion unit; the first voltage conversion unit is used to provide 110V DC power to the second vehicle power supply (3); the second voltage conversion unit is used to provide 600V DC power to the first vehicle power supply (2) and the second vehicle power supply (3); the control unit is used to receive the feedback voltage of the first vehicle power supply (2) and the feedback voltage of the second vehicle power supply (3) and output it. The first testing cabinet is used to perform load testing on the first vehicle power supply (2); The second testing cabinet is used to perform load testing on the second vehicle power supply (3).

2. The railway passenger car undercarriage power supply testing and maintenance platform according to claim 1, characterized in that, The first voltage conversion unit includes a first power converter T1, a switch SA1, a switch SA2, and a first relay KM1; The first power converter T1 is used to convert 380V AC power into 110V DC power; the positive terminal of the first power converter T1 is connected to one end of switch SA2; the other end of switch SA2 is connected to one end of switch SA1 and the 110V positive terminal of the second vehicle power supply (3); the other end of switch SA1 is connected to one end of the coil of the first relay KM1; the negative terminal of the first power converter T1 is connected to the other end of the coil of the first relay KM1 and the 110V negative terminal of the second vehicle power supply (3).

3. The railway passenger car undercarriage power supply testing and maintenance platform according to claim 2, characterized in that, The second voltage conversion unit includes a second power converter T2; The first relay KM1 has a switch consisting of a first switch and a second switch, and the first switch and the second switch constitute a double-pole single-throw switch. The second power converter T2 is used to convert 380V AC power to 600V DC power; the positive terminal of the second power converter T2 is connected to one end of the first relay KM1 switch, and the other end of the first relay KM1 switch is simultaneously connected to the 600V positive terminal of the second vehicle power supply (3) and the 600V positive terminal of the first vehicle power supply (2); the negative terminal of the second power converter T2 is connected to one end of the first relay KM1 switch, and the other end of the first relay KM1 switch is simultaneously connected to the 600V negative terminal of the second vehicle power supply (3) and the 600V negative terminal of the first vehicle power supply (2).

4. The railway passenger car undercarriage power supply testing and maintenance platform according to claim 3, characterized in that, The control unit includes a PLC controller, an adapter, and a PLC gateway; The LW1A interface of the PLC gateway is connected to the gateway interface of the first vehicle power supply (2); the LW2A interface of the PLC gateway is connected to the gateway interface of the second vehicle power supply (3). The PLC gateway transmits the operating status information of the first under-vehicle power supply (2) and the second under-vehicle power supply (3) to the PLC controller via the adapter; The PLC controller generates feedback results based on the operating conditions of the first under-vehicle power supply (2) and the second under-vehicle power supply (3).

5. A railway passenger car undercarriage power supply testing and maintenance platform according to claim 4, characterized in that, It also includes a display device; The display device is used to display the feedback voltage output by the PLC controller.

6. A power supply testing and maintenance platform for railway passenger cars according to claim 4, characterized in that, The second vehicle power supply (3) includes a charger, a single-phase inverter, filter Z1, filter Z2, filter Z3, filter Z4, a third transformer T3, a first current protector F1, and a second current protector F2; The +140 port of the single-phase inverter is connected to the other end of the switch SA2 through filter Z1; the -140 port of the single-phase inverter is connected to the negative terminal of the first power converter T1 through filter Z1; the U210 port of the single-phase inverter is connected to one end of the primary coil of the third transformer T3; the N210 port of the single-phase inverter is connected to the other end of the primary coil of the third transformer T3; the secondary coil of the third transformer T3 outputs 220V AC mains power through filter Z4. The +603 port of the charger is connected to one end of the first current protector F1 through filter Z3, and the other end of the first current protector F1 is connected to the other end of the first relay KM1 switch number one; the -603 port of the charger is connected to the other end of the first relay KM1 switch number two through filter Z3. The +110 port of the charger is connected to one end of the second current protector F2, and the other end of the second current protector F2 is connected to the other end of the switch SA2; the D+ port of the charger is connected to one load terminal of the second detection cabinet; the D01+ port of the charger is connected to another load terminal of the second detection cabinet through the filter Z2; the D01- port of the charger is connected to the negative terminal of the first power converter T1 through the filter Z2.

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