Practical training circuit, control panel and equipment for monitoring charging data of electric vehicle

Abstract

The utility model relates to the technical field of detection equipment, and particularly provides a practical training circuit, a control board and equipment for monitoring charging data of an electric vehicle. In the practical training circuit, a main control module is connected with a switch module and an ADC module and is used for interacting data with the outside; the input direct current and alternating current low-voltage ports of the charging input end and the output direct current and alternating current low-voltage ports of the charging output end are respectively connected to the switch module and the low-voltage measurement module; input direct current and alternating current ports of the charging input end and output direct current and alternating current ports of the charging output end are respectively connected to the high-voltage measurement module; the high voltage measurement module and the low voltage measurement module are respectively connected to the ADC module; and the switch module is used for switching the on-off states of low-voltage lines where the input direct-current low-voltage port, the output direct-current low-voltage port, the input alternating-current low-voltage port and the output alternating-current low-voltage port are located. The technical scheme for monitoring and training the alternating-current and direct-current charging data of the electric vehicle, which is comprehensive in function, accurate in detection, safe and reliable, is realized.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of detection equipment especially relates to a kind of practical training circuit, control panel and equipment for monitoring electric automobile charging data. BACKGROUND

[0002] With the vigorous development of electric automobile industry, vehicle-mounted alternating current charging gun, commercial alternating current charging gun, commercial direct current charging pile and the like as key supporting facilities, their quantity and application scenarios are increasing continuously.Accurate detection of charging equipment working state and data, charging equipment fault detection and rapid repair directly affect the profit margin of supplier and the satisfaction of customer.At present, there is lack of equipment for monitoring electric automobile alternating current and direct current charging data in the field of electric automobile charging, and the maintenance level of existing automobile maintenance personnel in relation to electric automobile charging fault still needs to be further strengthened.

[0003] In view of the above, in order to solve the deficiency of existing electric automobile alternating current and direct current charging data monitoring equipment and improve the technical level of electric automobile maintenance personnel, there is an urgent need for a technical scheme for monitoring electric automobile alternating current and direct current charging data, which is comprehensive in function, accurate in detection and safe and reliable. UTILITY MODEL CONTENT

[0004] To solve the above technical problems, the utility model provides a kind of practical training circuit, control panel and equipment for monitoring electric automobile charging data.

[0005] The utility model provides a kind of practical training circuit for monitoring electric automobile charging data, including main control module, charging input, charging output, switch module, high voltage measurement module, low voltage measurement module, ADC module;

[0006] The control end of the main control module is electrically connected with the control end of the switch module, the data end thereof is electrically connected with the output end of the ADC module, and the transmission end thereof is used for external data interaction;

[0007] The input direct current low voltage port and input alternating current low voltage port of the charging input are electrically connected to the first end of the switch module respectively;

[0008] The output direct current low voltage port and output alternating current low voltage port of the charging output are electrically connected to the second end of the switch module respectively;

[0009] The input direct current low voltage port, the input alternating current low voltage port, the output direct current low voltage port and the output alternating current low voltage port are also electrically connected to the input end of the low voltage measurement module respectively;

[0010] The input DC port and the input AC port of the charging input end and the output DC port and the output AC port of the charging output end are electrically connected to the input end of the high-voltage measurement module respectively;

[0011] The output end of the high-voltage measurement module and the output end of the low-voltage measurement module are electrically connected to the input end of the ADC module respectively;

[0012] The switch module is used for switching the on-off state of each low-voltage circuit between the input DC low-voltage port and the output DC low-voltage port and between the input AC low-voltage port and the output AC low-voltage port under the control of the master control module.

[0013] In a possible implementation, the switch module includes a relay unit, a transistor unit and a shift register unit.

[0014] The switch first end and the switch second end of the relay unit are used as the first end and the second end of the switch module respectively, the control first end of which is electrically connected to the working voltage and the control second end of which is electrically connected to the collector end of the transistor unit.

[0015] The emitter end of the transistor unit is electrically connected to the ground, and the base end thereof is electrically connected to the output end of the shift register unit.

[0016] The control end of the shift register unit is used as the control end of the switch module.

[0017] In a possible implementation, the switch module further includes a switch unit and a fault indication lamp unit.

[0018] The first end of the switch unit is electrically connected to the collector end of the transistor unit, and the second end thereof is electrically connected to the output end of the fault indication lamp unit.

[0019] The input end of the fault indication lamp unit is electrically connected to the working voltage.

[0020] In a possible implementation, the high-voltage measurement module includes a rectifier unit and a first voltage division sampling unit.

[0021] The first input end and the second input end of the rectifier unit are electrically connected to the input AC port and the output AC port respectively.

[0022] The first output end and the second output end of the rectifier unit and the input DC port and the output DC port are electrically connected to the input end of the first voltage division sampling unit respectively.

[0023] The output end of the first voltage division sampling unit is used as the output end of the high-voltage measurement module.

[0024] In a possible implementation, the low-voltage measurement module comprises a second voltage division sampling unit;

[0025] The input end of the second voltage division sampling unit serves as the input end of the low-voltage measurement module, and the output end thereof serves as the output end of the low-voltage measurement module.

[0026] In a possible implementation, the ADC module comprises an isolated signal amplification unit and an ADC conversion unit;

[0027] The input end of the isolated signal amplification unit is electrically connected with the output end of the high-voltage measurement module, and the output end thereof is electrically connected with the first input end of the ADC conversion unit;

[0028] The second input end of the ADC conversion unit is electrically connected with the output end of the low-voltage measurement module, and the output end thereof serves as the output end of the ADC module.

[0029] In a possible implementation, a wireless module is further included;

[0030] The wireless module is electrically connected to the transmission end of the master control module.

[0031] The utility model also provides a kind of practical training control panel for monitoring electric automobile charging data, including substrate and practical training circuit as described above;

[0032] The practical training circuit is arranged on the substrate.

[0033] The utility model also provides a kind of practical training equipment for monitoring electric automobile charging data, including box, measurement panel, practical training control panel as described above;

[0034] The measurement panel is arranged on the top of the box.

[0035] The practical training control panel is arranged in the inside of the box.

[0036] The box is provided with alternating current charging input, alternating current charging output, control wire harness input, control wire harness output, direct current positive input, direct current positive output, direct current negative input, direct current negative output.

[0037] The alternating current charging input is electrically connected with the input alternating current low-voltage port and the input alternating current port.

[0038] The alternating current charging output is electrically connected with the output alternating current low-voltage port and the output alternating current port.

[0039] The control wire harness input is electrically connected with the input direct current low-voltage port.

[0040] The control wire harness output is electrically connected with the output DC low-voltage port;

[0041] The DC positive input port, the DC negative input port and the input DC port are electrically connected;

[0042] The DC positive output port, the DC negative output port and the output DC port are electrically connected.

[0043] In a possible implementation, the measurement panel is provided with a measurement hole;

[0044] The input AC low-voltage port, the input DC low-voltage port, the output AC low-voltage port and the output DC low-voltage port are respectively connected with a measurement hole.

[0045] The technical scheme provided by the utility model has at least the following beneficial effects:

[0046] By arranging the switch module between the input DC low-voltage port and the output DC low-voltage port and between the input AC low-voltage port and the output AC low-voltage port, the low-voltage line can be set to be on or off by the main control module to simulate various low-voltage line faults, so as to meet various practical training requirements; the high voltage and the low voltage in the charging input end and the charging output end are measured by the high-voltage measurement module and the low-voltage measurement module respectively, so that the separation of high-voltage and low-voltage measurement is realized, and the safety is improved; the measurement data is transmitted to the main control module by the ADC module, so that intelligent control is realized. BRIEF DESCRIPTION OF DRAWINGS

[0047] Figure 1 A principle diagram of a practical training circuit for monitoring electric vehicle charging data is provided for the utility model embodiment;

[0048] Figure 2 A principle diagram of a switch module is provided for the utility model embodiment;

[0049] Figure 3 A principle diagram of a high-voltage measurement module is provided for the utility model embodiment;

[0050] Figure 4 A principle diagram of an ADC module is provided for the utility model embodiment;

[0051] Figure 5 A circuit principle diagram of a main control module is provided for the utility model embodiment;

[0052] Figure 6 Specific interface principle diagrams of a charging input end and a charging output end are provided for the utility model embodiment;

[0053] Figure 7The circuit principle diagram of the relay unit is provided for the embodiment of the utility model.

[0054] Figure 8 The circuit principle diagram of the transistor unit is provided for the embodiment of the utility model.

[0055] Figure 9 The circuit principle diagram of the shift register unit is provided for the embodiment of the utility model.

[0056] Figure 10 The circuit principle diagram of the switch unit and the fault indicating lamp unit is provided for the embodiment of the utility model.

[0057] Figure 11 The circuit principle diagram of the high voltage measurement module is provided for the embodiment of the utility model.

[0058] Figure 12 The circuit principle diagram of the low voltage measurement module is provided for the embodiment of the utility model.

[0059] Figure 13 The circuit principle diagram of the ADC module is provided for the embodiment of the utility model.

[0060] Figure 14 The first perspective view of the practical training equipment for monitoring electric automobile charging data is provided for the embodiment of the utility model.

[0061] Figure 15 The second perspective view of the practical training equipment for monitoring electric automobile charging data is provided for the embodiment of the utility model.

[0062] Figure 16 The third perspective view of the practical training equipment for monitoring electric automobile charging data is provided for the embodiment of the utility model.

[0063] In the drawing, 10, box body; 20, measurement panel; 101, AC charging input port; 102, AC charging output port; 103, control wire harness input port; 104, control wire harness output port; 105, DC positive input port; 106, DC positive output port; 107, DC negative input port; 108, DC negative output port; 201, measurement hole. DETAILED DESCRIPTION

[0064] In order to deepen the understanding of the utility model, the utility model will be further described in detail in combination with the drawings and embodiments below, and the embodiments are only used for explaining the utility model and do not constitute the limitation to the protection scope of the utility model.

[0065] Please refer to Figures 1 to 13The utility model provides a kind of practical training circuit for monitoring electric automobile charging data, including main control module, charging input, charging output, switch module, high voltage measurement module, low voltage measurement module, ADC module;

[0066] The control end of the main control module is electrically connected with the control end of the switch module, the data end thereof is electrically connected with the output end of the ADC module, and the transmission end is used for external data interaction.

[0067] The input DC low-voltage port and the input AC low-voltage port of the charging input are electrically connected to the first end of the switch module, respectively.

[0068] The output DC low-voltage port and the output AC low-voltage port of the charging output are electrically connected to the second end of the switch module, respectively.

[0069] The input DC low-voltage port, the input AC low-voltage port, the output DC low-voltage port and the output AC low-voltage port are also electrically connected to the input end of the low-voltage measurement module, respectively.

[0070] The input DC port and the input AC port of the charging input and the output DC port and the output AC port of the charging output are electrically connected to the input end of the high-voltage measurement module, respectively.

[0071] The output end of the high-voltage measurement module and the output end of the low-voltage measurement module are electrically connected to the input end of the ADC module, respectively.

[0072] The switch module is used for switching the on-off state of each low-voltage circuit between the input DC low-voltage port and the output DC low-voltage port and between the input AC low-voltage port and the output AC low-voltage port under the control of the main control module.

[0073] In this embodiment, the main control module can be implemented based on a conventional processor or an integrated chip with WiFi function. The charging input and the charging output can be implemented based on a conventional connector. The switch module can be implemented based on a relay, and multiple relays are controlled by multiple lines. The high-voltage measurement module and the low-voltage measurement module can be implemented based on the resistance voltage division principle. When measuring AC in the high-voltage measurement module, AC can be converted into DC first, and then voltage measurement is realized through the resistance voltage division principle. The ADC module can be implemented by using a conventional analog-to-digital conversion chip.

[0074] In a specific embodiment, as Figure 5The master control module can be implemented based on a master control chip U16, and the master control chip U16 can be a chip with integrated WiFi function, such as a chip with a model number of ESP32-WROOM-32UE-N4. The control end of the master control module corresponds to the DS, STCP and SHCP wiring ends, the data end corresponds to the CS0, CS1, CS2, MOSI, MISO and CLK wiring ends, and the transmission end corresponds to the U_TX and U_RX wiring ends. The master control module and the ADC module are connected in an SPI communication mode. Figure 6 The charging input end and the charging output end are implemented based on connectors U23 and U24, the connector U23 can be a connector with a model number of MX34024NF1, and the connector U24 can be a connector with a model number of MX34028NF2. The input DC low-voltage port corresponds to the A+_1, A-_1, S+_1, S-_1, DPE_1 and CC1_1 wiring ends, the output DC low-voltage port corresponds to the A+_2, A-_2, S+_2, S-_2, DPE_2 and CC1_2 wiring ends, the input AC low-voltage port corresponds to the CP_1, CC_1 and EPE_1 wiring ends, the output AC low-voltage port corresponds to the CP_2, CC_2 and EPE_2 wiring ends, the input DC port corresponds to the DC+_1 and DC-_1 wiring ends, the output DC port corresponds to the DC+_2 and DC-_2 wiring ends, the input AC port corresponds to the L_1 and N_1 wiring ends, and the output AC port corresponds to the L_2 and N_2 wiring ends. The on-off of A+_1 and A+_2, A-_1 and A-_2, S+_1 and S+_2, S-_1 and S-_2, DPE_1 and DPE_2, CC1_1 and CC1_2, CP_1 and CP_2, CC_1 and CC_2, and EPE_1 and EPE_2 is controlled by the switch module. The low-voltage line where A+_1 and A+_2 are located corresponds to the positive A+ of the low-voltage auxiliary power supply in the DC charging, the low-voltage line where A-_1 and A-_2 are located corresponds to the negative A- of the low-voltage auxiliary power supply in the DC charging, the low-voltage line where S+_1 and S+_2 are located corresponds to the charging communication CAN_H in the DC charging, the low-voltage line where S-_1 and S-_2 are located corresponds to the charging communication CAN_L in the DC charging, the low-voltage line where DPE_1 and DPE_2 are located corresponds to the protection ground PE in the DC charging, the low-voltage line where CC1_1 and CC1_2 are located corresponds to the charging connection confirmation CC1 in the DC charging, the low-voltage line where CP_1 and CP_2 are located corresponds to the control guide CP in the AC charging, the low-voltage line where CC_1 and CC_2 are located corresponds to the charging connection confirmation CC in the AC charging, and the low-voltage line where EPE_1 and EPE_2 are located corresponds to the protection ground PE in the AC charging. It should be noted that the charging connection confirmation CC2 in the DC charging and the charging connection confirmation CC1 are similar in function, and in specific implementation, they can be controlled or not controlled, and are directly connected between the charging input end and the charging output end.

[0075] In a possible implementation, the switch module comprises a relay unit, a transistor unit, and a shift register unit. Figure 2

[0076] The switch first end and the switch second end of the relay unit are respectively the first end and the second end of the switch module, the control first end of which is electrically connected to the working voltage, and the control second end of which is electrically connected to the collector end of the transistor unit.

[0077] The emitter end of the transistor unit is electrically connected to the ground, and the base end thereof is electrically connected to the output end of the shift register unit.

[0078] The control end of the shift register unit is the control end of the switch module.

[0079] In the embodiment, the relay unit can be composed of a plurality of conventional relays, each of which controls the on-off of a low-voltage line. The transistor unit can be implemented based on a triode, and specifically can be implemented through a Darlington transistor array. The shift register unit can be implemented based on a shift register. In a specific implementation, the relay unit is composed of nine relays K1-K9, which control the on-off of A+_1 and A+_2, A-_1 and A-_2, S+_1 and S+_2, S-_1 and S-_2, DPE_1 and DPE_2, CC1_1 and CC1_2, CP_1 and CP_2, CC_1 and CC_2, and EPE_1 and EPE_2, respectively. The switch first end of the relay unit is composed of the fourth pin of the relays K1-K9, the switch second end thereof is composed of the third pin of the relays K1-K9, the control first end thereof is composed of the second pin of the relays K1-K9, and the control second end thereof is composed of the first pin of the relays K1-K9. The working voltage is +12V. The transistor unit is composed of Darlington transistor arrays U1 and U2, the collector end of which is composed of the Output pin, the emitter end thereof is composed of the GND pin, and the base end thereof is composed of the Input pin. The shift register unit is composed of shift registers U3 and U4, and the control end thereof corresponds to the DS, STCP, and SHCP wiring ends. Figure 7 Figure 8 Figure 9

[0080] In a possible implementation, the switch module further comprises a switch unit and a fault indication lamp unit.

[0081] The first end of the switch unit is electrically connected to the collector end of the transistor unit, and the second end thereof is electrically connected to the output end of the fault indication lamp unit.

[0082] ​​​​The input end of the fault indication lamp unit is electrically connected with the working voltage.

[0083] In the embodiment, the switch unit can be implemented based on a conventional switch. The fault indication lamp unit can be implemented based on a light emitting diode, which is used to indicate the circuit breaking fault of a certain low-voltage line by the indication lamp when the circuit breaking fault is set by a person. In a specific implementation, as shown in Figure 10 , the switch unit is composed of the dial switches SW1 and SW2, and the fault indication lamp unit is implemented based on the LED.

[0084] In a possible implementation, as shown in Figure 3 , the high-voltage measurement module includes a rectifier unit and a first voltage sampling unit.

[0085] The first input end and the second input end of the rectifier unit are electrically connected with the input AC port and the output AC port respectively.

[0086] The first output end and the second output end of the rectifier unit and the input DC port and the output DC port are electrically connected with the input end of the first voltage sampling unit respectively.

[0087] The output end of the first voltage sampling unit serves as the output end of the high-voltage measurement module.

[0088] In the embodiment, the rectifier unit can be implemented based on a rectifier bridge, and the first voltage sampling unit performs voltage sampling based on the resistance voltage division principle. In a specific implementation, as shown in Figure 11 , the rectifier unit is composed of the rectifier bridge D35 and D36, and the first voltage sampling unit is composed of four groups of parallel voltage dividing resistor combinations. The rectifier unit can further be provided with the fuses F3 and F4, the voltage-dependent resistors RV1 and RV2, and the safety capacitors C68 and C70. The first input end of the rectifier unit corresponds to the L_1 and N_1 connection terminals, the second input end thereof corresponds to the L_2 and N_2 connection terminals, the first output end thereof is composed of the 1 and 3 pins of the rectifier bridge D35, and the second output end thereof is composed of the 1 and 3 pins of the rectifier bridge D36. The output end of the first voltage sampling unit corresponds to the L_1_U, N_1_U, L_2_U, N_2_U, DC_1, DC_1, DC_2, and DC_2 connection terminals.

[0089] In a possible implementation, the low-voltage measurement module includes a second voltage sampling unit.

[0090] The input end of the second voltage sampling unit serves as the input end of the low-voltage measurement module, and the output end thereof serves as the output end of the low-voltage measurement module.

[0091] In the embodiment, the second voltage sampling unit performs voltage sampling based on the resistance voltage division principle. In a specific implementation, as shown inFigure 12 The second voltage division sampling unit comprises 18 sets of voltage division resistor combinations, the input end of the second voltage division sampling unit corresponds to the A+_1, A+_2, A-_1, A-_2, S+_1, S+_2, S-_1, S-_2, CC1_1, CC1_2, DPE_1, DPE_2, CC_1, CC_2, EPE_1, EPE_2, CP_1, CP_2 terminals, and the output end corresponds to the A+_1_U, A+_2_U, A-_1_U, A-_2_U, S+_1_U, S+_2_U, S-_1_U, S-_2_U, CC1_1_U, CC1_2_U, DPE_1_U, DPE_2_U, CC_1_U, CC_2_U, EPE_1_U, EPE_2_U, CP_1_U, CP_2_U terminals.

[0092] In a possible implementation, the ADC module comprises an isolated signal amplification unit and an ADC conversion unit. Figure 4 The input end of the isolated signal amplification unit is electrically connected with the output end of the high-voltage measurement module, and the output end is electrically connected with the first input end of the ADC conversion unit.

[0093] The second input end of the ADC conversion unit is electrically connected with the output end of the low-voltage measurement module, and the output end serves as the output end of the ADC module.

[0094] The second input end of the ADC conversion unit is electrically connected with the output end of the low-voltage measurement module, and the output end serves as the output end of the ADC module.

[0095] In the embodiment, the isolated signal amplification unit can be implemented based on a conventional isolated amplifier, and the ADC conversion unit can adopt a conventional analog-to-digital conversion chip. In a specific implementation, the isolated signal amplification unit comprises four isolated amplifiers U7-U10, and the ADC conversion unit comprises three analog-to-digital conversion chips U11-U13. The input end of the isolated signal amplification unit corresponds to the L_1_U, N_1_U, L_2_U, N_2_U, DC_1, DC-_1, DC_2, DC-_2 terminals, and the output end corresponds to the LN1V_U, LN2V_U, DC1_U, DC2_U terminals. The output end of the ADC conversion unit corresponds to the CS0, CS1, CS2, MOSI, MISO, CLK terminals. Figure 13 In a possible implementation, a wireless module is further included.

[0096] The wireless module is electrically connected to the transmission end of the host module.

[0097] The wireless module is electrically connected to the transmission end of the host module.

[0098] In the embodiment, the wireless module can be a conventional WiFi module or a WiFi antenna, which is determined according to the function of the master module. For example, in the case that the master module does not have a built-in WiFi function, the wireless module can adopt a conventional WiFi module. In the case that the master module has a built-in WiFi function, the wireless module can adopt a conventional WiFi antenna.

[0099] The utility model also provides a kind of practical training control panel for monitoring electric automobile charging data, including substrate and practical training circuit as above;

[0100] The practical training circuit is arranged on the substrate.

[0101] In the embodiment, the substrate can adopt a conventional PCB board.

[0102] As Figures 14 to 16 The utility model also provides a kind of practical training equipment for monitoring electric automobile charging data, including box 10, measurement panel 20, practical training control panel as above;

[0103] The measurement panel 20 is arranged on the top of the box 10.

[0104] The practical training control panel is arranged in the interior of the box 10.

[0105] The box 10 is provided with alternating current charging input 101, alternating current charging output 102, control wire harness input 103, control wire harness output 104, direct current positive input 105, direct current positive output 106, direct current negative input 107, direct current negative output 108.

[0106] The alternating current charging input 101 is electrically connected with the input alternating current low-voltage port and the input alternating current port.

[0107] The alternating current charging output 102 is electrically connected with the output alternating current low-voltage port and the output alternating current port.

[0108] The control wire harness input 103 is electrically connected with the input direct current low-voltage port.

[0109] The control wire harness output 104 is electrically connected with the output direct current low-voltage port.

[0110] The direct current positive input 105 and the direct current negative input 107 are electrically connected with the input direct current port.

[0111] The direct current positive output 106 and the direct current negative output 108 are electrically connected with the output direct current port.

[0112] In the embodiment, the box 10 is buckled with the measurement panel 20 and is fastened by bolts, and the practical training control panel is fixedly arranged in the interior of the box 10.

[0113] In a possible implementation, the measurement panel 20 is provided with measurement holes 201.

[0114] The input AC low-voltage port, the input DC low-voltage port, the output AC low-voltage port and the output DC low-voltage port are respectively connected with one measurement hole 201.

[0115] In the embodiment, the measurement holes 201 are arranged on the measurement panel 20. Figure 6 The measurement holes 201 are respectively electrically connected with the wiring ends A+_1, A+_2, A-_1, A-_2, S+_1, S+_2, S-_1, S-_2, DPE_1, DPE_2, CC1_1, CC1_2, CP_1, CP_2, CC_1, CC_2, EPE_1 and EPE_2, and the voltage, resistance and other electric quantity parameters between A+_1 and A+_2, between A-_1 and A-_2, between S+_1 and S+_2, between S-_1 and S-_2, between DPE_1 and DPE_2, between CC1_1 and CC1_2, between CP_1 and CP_2, between CC_1 and CC_2 and between EPE_1 and EPE_2 can be directly measured through the measurement holes 201, so as to determine the working state of the low-voltage lines where the wiring ends are located, and facilitate the expansion of related training subjects. Figures 14 to 16 It should be noted that the number and position of the measurement holes 201 shown in the embodiment only play a demonstration role and are not used to limit the number and position, and the number and position can be adjusted in specific implementation.

[0116] The above embodiments should not limit the utility model in any way, and any technical solution obtained by equivalent replacement or equivalent conversion falls within the protection scope of the utility model.

Claims

1. A training circuit for monitoring electric vehicle charging data, characterized by, It includes a main control module, a charging input terminal, a charging output terminal, a switch module, a high voltage measurement module, a low voltage measurement module, and an ADC module; The control terminal of the main control module is electrically connected to the control terminal of the switch module, its data terminal is electrically connected to the output terminal of the ADC module, and its transmission terminal is used for external data exchange. The DC low-voltage input port and AC low-voltage input port of the charging input terminal are electrically connected to the first terminal of the switching module, respectively. The DC low-voltage output port and AC low-voltage output port of the charging output terminal are electrically connected to the second terminal of the switching module, respectively. The input DC low-voltage port, the input AC low-voltage port, the output DC low-voltage port, and the output AC low-voltage port are also electrically connected to the input terminal of the low-voltage measurement module, respectively. The DC input port and AC input port of the charging input terminal, and the DC output port and AC output port of the charging output terminal are electrically connected to the input terminal of the high voltage measurement module, respectively. The output terminals of the high-voltage measurement module and the low-voltage measurement module are electrically connected to the input terminal of the ADC module, respectively. The switching module is used to switch the on / off state of each low-voltage line between the input DC low-voltage port and the output DC low-voltage port, and between the input AC low-voltage port and the output AC low-voltage port, under the control of the main control module.

2. The training circuit of claim 1, wherein The switching module includes a relay unit, a transistor unit, and a shift register unit; The first and second terminals of the relay unit serve as the first and second terminals of the switch module, respectively. The first terminal is electrically connected to the operating voltage, and the second terminal is electrically connected to the collector terminal of the transistor unit. The emitter of the transistor unit is electrically connected to ground, and its base is electrically connected to the output of the shift register unit. The control terminal of the shift register unit serves as the control terminal of the switch module.

3. The training circuit of claim 2, wherein The switch module also includes a switch unit and a fault indicator unit; The first terminal of the switching unit is electrically connected to the collector terminal of the transistor unit, and its second terminal is electrically connected to the output terminal of the fault indicator unit. The input terminal of the fault indicator unit is electrically connected to the operating voltage.

4. The training circuit of claim 1, wherein The high-voltage measurement module includes a rectifier unit and a first voltage divider sampling unit; The first input terminal and the second input terminal of the rectifier unit are electrically connected to the input AC port and the output AC port, respectively; The first output terminal, the second output terminal, the input DC port, and the output DC port of the rectifier unit are respectively electrically connected to the input terminal of the first voltage divider sampling unit; The output terminal of the first voltage divider sampling unit serves as the output terminal of the high voltage measurement module.

5. The training circuit of claim 1, wherein The low voltage measurement module includes a second voltage divider sampling unit; The input terminal of the second voltage divider sampling unit serves as the input terminal of the low voltage measurement module, and its output terminal serves as the output terminal of the low voltage measurement module.

6. The training circuit of claim 1, wherein The ADC module includes an isolated signal amplification unit and an ADC conversion unit; The input end of the isolation signal amplification unit is electrically connected with the output end of the high-voltage measurement module, and the output end is electrically connected with the first input end of the ADC conversion unit; The second input end of the ADC conversion unit is electrically connected with the output end of the low-voltage measurement module, and the output end serves as the output end of the ADC module.

7. The training circuit of claim 1, wherein Further comprising a wireless module; The wireless module is electrically connected to the transmission end of the master module.

8. A training control board for monitoring electric vehicle charging data, characterized by, The base plate and the practical training circuit as claimed in any one of claims 1 to 7 are included; The practical training circuit is arranged on the base plate.

9. A training device for monitoring electric vehicle charging data, comprising: The box, the measurement panel, and the practical training control board as claimed in claim 8 are included; The measurement panel is arranged on the top of the box; The practical training control board is arranged in the interior of the box; The box is provided with an alternating current charging input port, an alternating current charging output port, a control wire harness input port, a control wire harness output port, a direct current positive input port, a direct current positive output port, a direct current negative input port, and a direct current negative output port; The alternating current charging input port is electrically connected with the input alternating current low-voltage port and the input alternating current port; The alternating current charging output port is electrically connected with the output alternating current low-voltage port and the output alternating current port; The control wire harness input port is electrically connected with the input direct current low-voltage port; The control wire harness output port is electrically connected with the output direct current low-voltage port; The direct current positive input port and the direct current negative input port are electrically connected with the input direct current port; The direct current positive output port and the direct current negative output port are electrically connected with the output direct current port.

10. The training device of claim 9, wherein, The measurement panel is provided with measurement holes; Each low-voltage line end point where the input alternating current low-voltage port, the input direct current low-voltage port, the output alternating current low-voltage port, and the output direct current low-voltage port are arranged is respectively connected with one measurement hole.

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