Alternating current charging pile control guide system for EMC (Electro Magnetic Compatibility) test

Abstract

The utility model provides an alternating current charging pile control guide system for EMC test, which is used for building an alternating current charging pile working condition circuit during the EMC test in a laboratory, and comprises a charging pile connector, an input circuit and a guide device, the input circuit and the guide device are connected to the charging pile connector, and a state monitoring device, a leakage protection circuit breaker and a load connector are arranged on the input circuit. The guiding device is used for simulating communication between the electric vehicle and the charging pile, so that the charging pile enters different working states, such as a charging preparation state, a charging state or a fault state, and the states can be switched through a switch K in the guiding device; the leakage protector provides a safety measure to prevent electrical accidents; the system can simulate a real charging condition in a laboratory, can provide an effective test condition for the EMC test of the charging pile, and employs a passive monitoring device to improve the electromagnetic compatibility of the system, and avoids the impact on the EMC test of the charging pile.

Description

Technical Field

[0001] The utility model relates to the technical field of electric vehicle charging, in particular to an AC charging pile control and guidance system for EMC testing. Background Art

[0002] With the rapid development of the electric vehicle industry, charging piles, as key supporting facilities for electric vehicles, the importance of their performance and quality has become increasingly prominent. In order to ensure the reliability and safety of charging piles, it is particularly important to conduct electromagnetic compatibility (EMC) tests on them. Traditional EMC test methods are usually carried out on-site, but due to the complexity and uncertainty of the on-site environment, the test results may be interfered by the external environment. In addition, on-site testing also requires a large amount of resource investment, including personnel, equipment, and time, etc. Therefore, developing a system that can simulate real charging conditions in a laboratory environment has become an urgent need. Summary of the Utility Model

[0003] In view of the above-mentioned disadvantages of the prior art, the purpose of the present utility model is to provide an AC charging pile control and guidance system for EMC testing, which is used to solve the problem that traditional EMC test methods in the prior art are usually carried out on-site and the test results may be interfered by the external environment.

[0004] To achieve the above object and other related objects, the present utility model provides the following technical solutions:

[0005] An AC charging pile control and guidance system for EMC testing, which is used for building the working condition circuit of the AC charging pile during laboratory EMC testing, includes a charging pile connector, an input circuit connected to the charging pile connector, and a guiding device. A status monitoring device, a residual current circuit breaker, and a load connector are provided on the input circuit.

[0006] To implement the above technical solution, the main purpose of this AC charging pile control and guidance system is to simulate real charging conditions in a laboratory environment for EMC testing; the charging pile connector is responsible for connecting the AC charging pile and the guidance control system, providing a power transmission path. It can be a national standard connector or a US standard connector, and both can withstand at least 32A of current. The function of the guiding device is to simulate the communication between the electric vehicle and the charging pile, enabling the charging pile to enter different working states, such as charging preparation, charging state, or fault state. The above states can be switched through the switch K in the guiding device, and different working modes can be switched by closing the corresponding switch; the leakage protection circuit breaker is a safety measure that will automatically disconnect the simulated load if excessive leakage current is detected in the circuit to prevent electrical accidents; the load connector is used to connect the load device, usually simulating the electric vehicle battery or other pure resistance devices to simulate the actual charging environment; this system can simulate real charging conditions in the laboratory, can provide effective test conditions for the EMC testing of the charging pile, and uses a passive monitoring device to improve the electromagnetic compatibility performance of the system itself and avoid affecting the EMC testing of the charging pile.

[0007] In an embodiment of the present utility model, the charging pile connector includes a national standard connector and a US standard connector; the input circuit includes three-phase circuits L1, L2, and L3 connected to the national standard connector, and also includes a single-phase circuit L4 provided on the US standard connector; a neutral line N1 and a grounding wire PE1 are also provided on the national standard connector, and a neutral line N2 and a grounding wire PE2 are also provided on the US standard connector; the status monitoring device includes status indicator lights provided between the circuits L1, L2, L3 and the neutral line N1, and between the circuit L4 and the neutral line N2.

[0008] To implement the above technical solution, this system uses a national standard connector or a US standard connector to connect the charging pile with a national standard or US standard charging interface to an electric vehicle. The national standard connector is applicable to single-phase or three-phase charging circuits, while the US standard connector is applicable to single-phase charging circuits. Both of these connectors are equipped with a neutral line and a grounding wire to ensure safe power transmission. The status monitoring device monitors the status between the circuits L1, L2, L3 and the neutral line N1, and the status between the circuit L4 and the neutral line N2 through status indicator lights. In this way, the system can simulate the charging of electric vehicles with different types of charging interfaces and monitor their working states; the status indicator lights provide visual feedback, allowing the operator to know the working state of the charging pile, which helps in diagnosis and debugging.

[0009] In an embodiment of the present utility model, the guiding device includes a guiding circuit CP1 connected to the national standard connector and a guiding circuit CP2 connected to the American standard connector; control circuits are provided between the guiding circuit CP1 and the ground wire PE1 and between the guiding circuit CP2 and the ground wire PE2.

[0010] To implement the above technical solution, the system uses the guiding circuits CP1 and CP2 to simulate the communication between an electric vehicle and an AC charging pile. These two guiding circuits are respectively connected to the national standard connector and the American standard connector to adapt to different charging standards. The control circuit is arranged between the guiding circuit and the ground wire and is used to control the working state of the charging pile. By changing the configuration of the control circuit, the charging preparation, charging state, and fault state can be simulated.

[0011] In an embodiment of the present utility model, the control circuit includes a diode connected in series on the guiding circuit CP1 and the guiding circuit CP2, and a branch circuit connected in series with the diode. The branch circuit includes a first connection branch, a second charging branch, and a third fault branch arranged in parallel. A resistor R1 is provided on the first connection branch, a resistor R2 is provided on the second charging branch, and a resistor R3 is provided on the third fault branch. Switches K are provided on the first connection branch, the second charging branch, and the third fault branch.

[0012] To implement the above technical solution, the diode connected in series on the guiding circuits CP1 and CP2 and the three branch circuits are used to control the working state of the charging pile. The three branch circuits - the first connection branch, the second charging branch, and the third fault branch - simulate different working states through their respective switches K. The resistors R1 and R2 are used to adjust the voltage amplitude of the working timing of the charging pile to match different working states. Through the switches K and the resistors R1, R2, and R3, the working state of the charging pile can be accurately controlled, simulating the actual charging process and fault state of the charging pile. The system supports three basic working states - charging preparation, charging state, and fault state, covering the basic functions of the charging pile; the diode prevents the reverse flow of current and protects other components in the circuit. Since the system can stably simulate the working state of the charging pile, the same working conditions can be tested repeatedly to verify the stability and consistency of the charging pile test results; the system can be connected to different load devices to simulate various charging scenarios to test the performance of the charging pile under different working conditions.

[0013] In an embodiment of the present utility model, ammeters are connected in series on the input circuit L1 and the input circuit L4; voltmeters are provided between the input circuits L1 and L2 and between the input circuit L4 and the neutral line N2.

[0014] To implement the above technical solution, an ammeter and a voltmeter are used to monitor the working state of the charging pile. The ammeter is installed on the input circuits L1 and L4 to measure the current value; the voltmeter is set between the input circuits L1 and L2 and between the input circuit L4 and the neutral line N2 to measure the voltage value. The voltage and current parameters of the charging pile are monitored. These parameters are crucial for determining the performance of the charging pile because they directly affect the safety and efficiency of the charging process.

[0015] In an embodiment of the present invention, a signal acquisition circuit is connected in parallel between the guiding circuit CP1 and the grounding wire PE1 and between the guiding circuit CP2 and the grounding wire PE2, and a signal acquisition port is provided on the signal acquisition circuit.

[0016] To implement the above technical solution, the working state data of the charging pile is collected through the signal acquisition circuit. The signal acquisition circuit is connected in parallel between the guiding circuit CP1 and the grounding wire PE1 and between the guiding circuit CP2 and the grounding wire PE2. The signal acquisition port allows the operator to access external devices such as an oscilloscope or a data recorder to capture and analyze the timing signals of the charging pile's operation, which can help the operator deeply study the charging process of the charging pile; the signal acquisition circuit can complete the acquisition of the charging timing signals of the charging pile, which helps to judge the state of the charging process of the charging pile, and analyze the magnitude of the charging current through the duty cycle of the acquired signal.

[0017] In an embodiment of the present invention, a leakage protection circuit breaker and a load connector are sequentially provided at the output ends of the neutral lines N1, N2, grounding wires PE1, and PE2.

[0018] To implement the above technical solution, a leakage protection circuit breaker is used to protect the charging pile and the load device. The output ends of the neutral line, phase line, and grounding wire are connected to the load connector after passing through the leakage protection circuit breaker. If an overcurrent or short circuit occurs in the circuit, the leakage protection circuit breaker will automatically cut off the power supply to protect the device from damage.

[0019] In an embodiment of the present invention, the ammeter is a pointer ammeter, and the voltmeter is a pointer voltmeter.

[0020] To implement the above technical solution, a pointer voltmeter and ammeter are used to monitor voltage and current parameters, which can effectively reduce their own noise. There is no high-speed electronic circuit inside the pointer instrument like in the digital instrument, so the electromagnetic radiation generated is less and will not have too much impact on the test results.

[0021] As described above, an AC charging pile control and guiding system for EMC testing of the present invention has the following beneficial effects:

[0022] 1. The control signal guiding function of the AC charging pile is realized, enabling it to operate normally under the working conditions of the simulated load, and being able to judge whether the charging pile is in the charging state through the status of the indicator light, improving the accuracy of the test.

[0023] 2. In the EMC test, this system can facilitate the monitoring of parameters such as voltage and current, and the influence of its own circuit and structure on the test results is relatively small, reducing the uncertainty and error of the test.

[0024] 3. By means of key switches to simulate different working states of the charging pile, including the charging preparation state, the charging state and the fault state, the real-time acquisition and analysis of the working sequence of the charging pile are realized, which helps to deeply understand the working characteristics of the charging pile.

[0025] 4. Using pointer voltmeters and ammeters to monitor voltage and current parameters can effectively reduce its own noise, enhance the anti-interference ability, have a relatively low impact on the EMC test results, and improve the reliability of the test.

[0026] 5. The analog fault function is added, which can test the fault state function of the charging pile, enhancing the comprehensiveness and practicality of the test. Brief Description of the Drawings

[0027] Figure 1 It shows the circuit schematic diagram of the present utility model. Detailed Embodiment

[0028] The following specific embodiments illustrate the implementation manners of the present utility model. Those skilled in this technology can easily understand other advantages and effects of the present utility model from the content disclosed in this specification. It should be noted that, without conflict, the following embodiments and the features in the embodiments can be combined with each other.

[0029] Please refer to Figure 1 , the present utility model provides an AC charging pile control and guiding system for EMC testing, which is used for building the working condition circuit of the AC charging pile during laboratory EMC testing, including a charging pile connector, an input circuit and a guiding device connected to the charging pile connector, and a status monitoring device, a leakage protection circuit breaker and a load connector are arranged on the input circuit.

[0030] The main purpose of this AC charging pile control and guidance system is to simulate real charging conditions in a laboratory environment for EMC testing; the charging pile connector is responsible for connecting the AC charging pile and the guidance control system, providing a power transmission path. It can be a national standard connector or a US standard connector, and both can withstand at least 32A of current. The role of the guidance device is to simulate the communication between the electric vehicle and the charging pile, enabling the charging pile to enter different working states, such as charging preparation, charging state, or fault state. The above states can be switched through the switch K in the guidance device, and different working modes can be switched by closing the corresponding switch; the leakage protection circuit breaker is a safety measure that will automatically disconnect the simulated load if excessive leakage current is detected in the circuit to prevent electrical accidents; the load connector is used to connect the load device, usually simulating the electric vehicle battery or other test equipment to simulate the actual charging environment; this system can simulate real charging conditions in the laboratory, can provide effective test conditions for the EMC testing of the charging pile, and uses a passive monitoring device to improve the electromagnetic compatibility performance of the system itself and avoid affecting the EMC testing of the charging pile.

[0031] The charging pile connector includes a national standard connector and a US standard connector; the input circuit includes three-phase circuits L1, L2, and L3 connected to the national standard connector, and also includes a single-phase circuit L4 provided on the US standard connector; a neutral line N1 and a ground wire PE1 are also provided on the national standard connector, and a neutral line N2 and a ground wire PE2 are also provided on the US standard connector; the status monitoring device includes status indicator lights provided between the circuits L1, L2, and L3 and the neutral line N1, and between the circuit L4 and the neutral line N2.

[0032] This system uses a national standard connector or a US standard connector to connect the charging pile with a national standard or US standard charging interface to the electric vehicle. The national standard connector is suitable for single-phase or three-phase charging circuits, while the US standard connector is suitable for single-phase charging circuits. Both of these connectors are equipped with a neutral line and a ground wire to ensure safe power transmission. The status monitoring device monitors the status between the circuits L1, L2, and L3 and the neutral line N1, as well as the status between the circuit L4 and the neutral line N2 through status indicator lights. In this way, the system can simulate the charging of electric vehicles with different types of charging interfaces and monitor their working status; the status indicator lights provide visual feedback, allowing the operator to know the working status of the charging pile, which helps with diagnosis and debugging.

[0033] The guidance device includes a guidance circuit CP1 connected to the national standard connector and a guidance circuit CP2 connected to the US standard connector; control circuits are provided between the guidance circuit CP1 and the ground wire PE1, and between the guidance circuit CP2 and the ground wire PE2.

[0034] The system utilizes the pilot circuits CP1 and CP2 to simulate the communication between an electric vehicle and an AC charging pile. These two pilot circuits are respectively connected to the national standard connector and the American standard connector to adapt to different charging standards. The control circuit is arranged between the pilot circuit and the ground wire and is used to control the working state of the charging pile. By changing the configuration of the control circuit, the charging preparation, charging state, and fault state can be simulated.

[0035] The control circuit includes diodes connected in series on the pilot circuit CP1 and the pilot circuit CP2, and a branch circuit connected in series with the diodes. The branch circuit includes a first connection branch, a second charging branch, and a third fault branch arranged in parallel. A resistor R1 is provided on the first connection branch, a resistor R2 is provided on the second charging branch, and a resistor R3 is provided on the third fault branch. Switches K are provided on the first connection branch, the second charging branch, and the third fault branch.

[0036] The diodes connected in series on the pilot circuits CP1 and CP2 and the three branch circuits are used to control the working state of the charging pile. The three branch circuits - the first connection branch, the second charging branch, and the third fault branch - simulate different working states through their respective switches K. Resistors R1 and R2 are used to adjust the voltage amplitude of the charging pile working timing to match different working states. Through the switches K and the resistors R1, R2, and R3, the working state of the charging pile can be accurately controlled, simulating the actual charging process and fault state of the charging pile. The system supports three basic working states - charging preparation, charging state, and fault state, covering the basic functions of the charging pile; the diodes prevent the reverse flow of current and protect other components in the circuit. Since the system can stably simulate the working state of the charging pile, the same working conditions can be tested repeatedly to verify the stability and consistency of the charging pile test results; the system can be connected to different load devices to simulate various charging scenarios to test the performance of the charging pile under different working conditions.

[0037] Ammeters are connected in series on the input circuit L1 and the input circuit L4; voltmeters are provided between the input circuit L1 and the input circuit L2 and between the input circuit L4 and the neutral wire N2. The ammeters and voltmeters are used to monitor the working state of the charging pile. The ammeters are installed on the input circuit L1 and the input circuit L4 to measure the current value; the voltmeters are set between the input circuit L1 and the input circuit L2 and between the input circuit L4 and the neutral wire N2 to measure the voltage value. Monitor the voltage and current parameters of the charging pile. These parameters are crucial for determining the performance of the charging pile because they directly affect the safety and efficiency of the charging process.

[0038] A signal acquisition circuit is connected in parallel between the guiding circuit CP1 and the ground wire PE1, and between the guiding circuit CP2 and the ground wire PE2. A signal acquisition port is provided on the signal acquisition circuit. The working state data of the charging pile is collected through the signal acquisition circuit, which is connected in parallel between the guiding circuit CP1 and the ground wire PE1, and between the guiding circuit CP2 and the ground wire PE2. The signal acquisition port allows an operator to access external devices, such as an oscilloscope or a data recorder, to capture and analyze the timing signals of the charging pile's operation, which can help the operator deeply study the charging process of the charging pile; the signal acquisition circuit can complete the acquisition of the charging timing signals of the charging pile, which helps to judge the state of the charging process of the charging pile, and analyze the magnitude of the charging current through the duty cycle of the acquired signal.

[0039] The output ends of the neutral line N1, neutral line N2, ground wire PE1 and ground wire PE2 are successively provided with the leakage protection circuit breaker and the load connector. The leakage protection circuit breaker is used to protect the charging pile and the load device. The output ends of the neutral line, phase line and ground wire are connected to the load connector after passing through the leakage protection circuit breaker. If overcurrent or short circuit occurs in the circuit, the leakage protection circuit breaker will automatically cut off the power supply to protect the device from damage.

[0040] The ammeter is a pointer ammeter, and the voltmeter is a pointer voltmeter. The pointer voltmeter and ammeter are used to monitor voltage and current parameters, which can effectively reduce their own noise. There is no high-speed electronic circuit inside the pointer instrument like the digital instrument, so the electromagnetic radiation generated is less and will not have too much impact on the test results.

[0041] The above embodiments are only illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. All equivalent modifications or changes made by those with ordinary knowledge in the technical field to which the present invention pertains without departing from the spirit and technical ideas disclosed by the present invention should still be covered by the claims of the present invention.

Claims

1. An AC charging pile control and guidance system for EMC testing, which is used for building the working condition circuit of the AC charging pile during laboratory EMC testing, and is characterized in that, Including: A charging pile connector, an input circuit connected to the charging pile connector, and a guiding device. A status monitoring device, a leakage protection circuit breaker, and a load connector are provided on the input circuit.

2. The AC charging pile control and guidance system for EMC testing according to claim 1, wherein: The charging pile connector includes a national standard connector and a US standard connector; The input circuit includes three-phase circuits L1, L2, and L3 connected to the national standard connector, and also includes a single-phase circuit L4 provided on the US standard connector; A neutral line N1 and a grounding line PE1 are also provided on the national standard connector, and a neutral line N2 and a grounding line PE2 are also provided on the US standard connector; The status monitoring device includes status indicator lights provided between the circuits L1, L2, L3 and the neutral line N1, and between the circuit L4 and the neutral line N2.

3. The AC charging pile control and guidance system for EMC testing according to claim 2, characterized in that: The guiding device includes a guiding circuit CP1 connected to the national standard connector and a guiding circuit CP2 connected to the US standard connector; A control circuit is provided between the guiding circuit CP1 and the grounding line PE1, and between the guiding circuit CP2 and the grounding line PE2.

4. The AC charging pile control and guidance system for EMC testing according to claim 3, characterized in that: The control circuit includes a diode connected in series on the guiding circuit CP1 and the guiding circuit CP2, and a branch circuit connected in series with the diode. The branch circuit includes a first connection branch, a second charging branch, and a third fault branch connected in parallel. A resistor R1 is provided on the first connection branch, a resistor R2 is provided on the second charging branch, a resistor R3 is provided on the third fault branch, and switches K are provided on the first connection branch, the second charging branch, and the third fault branch.

5. The AC charging pile control and guidance system for EMC testing according to claim 4, characterized in that: Ammeters are connected in series on the input circuits L1 and L4; Voltmeters are provided between the input circuits L1 and L2, and between the input circuit L4 and the neutral line N2.

6. The AC charging pile control and guidance system for EMC testing according to claim 4, characterized in that: Signal acquisition circuits are connected in parallel between the guiding circuit CP1 and the grounding line PE1, and between the guiding circuit CP2 and the grounding line PE2. A signal acquisition port is provided on the signal acquisition circuit.

7. The AC charging pile control and guidance system for EMC testing according to claim 2, characterized in that: The output ends of the neutral line N1, the neutral line N2, the grounding line PE1, and the grounding line PE2 are sequentially provided with the leakage protection circuit breaker and the load connector.

8. The AC charging pile control and guidance system for EMC testing according to claim 5, characterized in that: The ammeter is a pointer-type ammeter, and the voltmeter is a pointer-type voltmeter.

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