Control and Guidance Test Device and AC Charging Pile Calibration System

Abstract

The present invention discloses a control and guidance test device and an AC charging pile verification system. The control and guidance test device includes a controller, a load module, and a first detection circuit. The first detection circuit is used to detect the connection confirmation signal CC, current, and voltage sent by the charging pile interface. The controller sends a first control signal to the first relay K1 to control the opening and closing of the first relay K1 to simulate the disconnection test of the connection confirmation signal CC. When sending a second control signal to the second relay K2 and conducting the disconnection test of the connection confirmation signal CC, the controller controls the second relay K2 to open. When testing the resistance value of the second resistor R2, the controller controls the second relay K2 to close. The control and guidance test device and the AC charging pile verification system provided by the present invention achieve the compatible verification of AC charging piles with multiple standard systems through the selection of interfaces and verification programs, effectively improving the utilization rate of instrument equipment and reducing the equipment cost.

Description

Technical Field

[0001] The present invention belongs to the technical field of charging pile detection, and relates to a control and guidance test device and an alternating current charging pile verification system. Background Art

[0002] With the continuous development of new energy electric vehicles, the charging piles of electric vehicles, as the basic supporting facilities of new energy electric vehicles, are becoming increasingly important. At present, globally, there are mainly three major systems for alternating current charging piles: the national standard GB / T, the American standard IEC (Type1), and the European standard IEC (Type2). These three standard systems are different in terms of interfaces, control and guidance, and applicable power supply standards. Conventional verification means are to verify charging piles of different standard systems through verification devices corresponding to the standard systems. When verifying charging piles of other standard systems, it is necessary to replace the corresponding verification devices, resulting in a waste of instrument and equipment resources. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a control and guidance test device and an alternating current charging pile verification system in view of the deficiencies in the above-mentioned existing technologies.

[0004] A control and guidance test device provided by the present invention includes:

[0005] A controller, a load module, and a first detection circuit. The first detection circuit is used to detect the connection confirmation signal CC, current, and voltage sent by the charging pile interface. The first detection circuit includes a first sampling interface, a first sampling circuit, a first relay K1, a second relay K2, a first resistor R1, and a second resistor R2. One end of the first relay K1 is connected to the connection confirmation signal CC sent by the charging pile interface, and the other end is grounded; one end of the second relay K2 is connected to the connection confirmation signal CC sent by the charging pile interface, and the other end is connected to the first resistor R1. The other end of the first resistor R1 is connected to an external power supply; one end of the second resistor R2 is connected to the connection confirmation signal CC sent by the charging pile interface, and the other end is grounded; one end of the first sampling circuit is connected to the connection confirmation signal CC sent by the charging pile interface, and the other end is connected to the first sampling interface;

[0006] The controller sends a first control signal to the first relay K1 to control the opening and closing of the first relay K1 to simulate the disconnection test of the connection confirmation signal CC; the controller sends a second control signal to the second relay K2. When performing the disconnection test of the connection confirmation signal CC, the second relay K2 is controlled to disconnect. When testing the resistance value of the second resistor R2, the second relay K2 is controlled to close;

[0007] A first detection point and a second detection point are provided between the second relay K2 and the connection confirmation signal CC sent by the charging pile interface. The first sampling interface is used to determine the current capacity of the AC charging pile connected by measuring the voltage at the second detection point. The first sampling interface is also used to detect the voltage at the second detection point during the disconnection test of the connection confirmation signal CC.

[0008] Further, the device further includes a second detection circuit for detecting the connection confirmation signal CC, current, and voltage sent by the charging pile interface when the load module does not include a battery management system. The second detection circuit includes a second sampling interface, a second sampling circuit, a third resistor R3, a fourth resistor R4, and a first switch S1. One end of the third resistor R3 is connected to the connection confirmation signal CC sent by the charging pile interface, and the other end is connected to the first switch S1. The other end of the first switch S1 is grounded, and the fourth resistor R4 is connected in parallel across the first switch S1. One end of the second sampling circuit is connected to the connection confirmation signal CC sent by the charging pile interface, and the other end is connected to the second sampling interface.

[0009] The controller sends a third control signal to the first switch S1 to control the first switch S1 to close when the load module includes a battery management system, and to control the first switch S1 to open when the load module does not include a battery management system.

[0010] The first detection point is located between the third resistor R3 and the connection confirmation signal CC sent by the charging pile interface. The second sampling interface is used to detect the voltage and charging status at the first detection point.

[0011] Further, the device further includes a third detection circuit for detecting the control pilot signal CP sent by the charging pile interface, including a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, a third relay K3, a fourth relay K4, a fifth relay K5, a sixth relay K6, a second switch S2, a first comparison circuit, a third sampling circuit, a fourth sampling circuit, a third sampling interface, a fourth sampling interface, and a fifth sampling interface; one end of the fifth resistor R5 is connected to the control pilot signal CP sent by the charging pile interface, and the other end is connected to the third relay K3; the other end of the third relay K3 is grounded; one end of the third sampling circuit is connected to the control pilot signal CP sent by the charging pile interface, and the other end is connected to the third sampling interface; one end of the first comparison circuit is connected to the control pilot signal CP sent by the charging pile interface, and the other end is connected to the fourth sampling interface; one end of the fourth relay K4 is connected to the control pilot signal CP sent by the charging pile interface, and the other end is connected to the positive electrode of the diode; the negative electrode of the diode is connected to one end of the fourth sampling circuit, and the other end of the fourth sampling circuit is connected to the fifth sampling interface; one end of the sixth relay K6 is connected to the analog voltage, and the other end is connected to the sixth resistor R6; the sixth resistor R6 is connected in series with the fifth relay K5 and in parallel with the seventh resistor R7; the seventh resistor R7 is connected in series with the second switch S2; one end of the sixth resistor R6 and the seventh resistor R7 is connected to the negative electrode of the diode, and the other ends of the fifth relay K5 and the second switch S2 are grounded;

[0012] The controller sends a fourth control signal to the third relay K3 to simulate the grounding test of the control pilot signal CP by controlling the closing of the third relay K3; the controller sends a fifth control signal to the fourth relay K4 to simulate the disconnection test of the control pilot signal CP by controlling the opening of the fourth relay K4; the controller sends a sixth control signal to the fifth relay K5 and a seventh control signal to the second switch S2 to simulate the PE broken pin test and the disconnection test of the charging interface by controlling the opening of the fifth relay K5 and the second switch S2. When the load module does not include a battery management system, the fifth relay K5 and the second switch S2 are in the open state; a third detection point is provided between the negative electrode of the diode and the fourth sampling circuit. The controller sends an eighth control signal to the sixth relay K6 to control the sixth relay K6 to open, connect the analog voltage to the third detection point, and complete the loop voltage limit test of the control pilot signal CP by adjusting the magnitude of the analog voltage;

[0013] A fourth detection point is provided between the third sampling circuit and the control pilot signal CP sent by the charging pile interface. The third sampling interface is used to measure the positive and negative pulse amplitudes and duty cycles at the fourth detection point; the fourth sampling interface is used to measure the PWM parameters at the fourth detection point, including: frequency, duty cycle, rise time, and fall time; the fifth sampling interface is used to measure the positive pulse amplitude and duty cycle of the signal at the third detection point.

[0014] The present invention also provides an alternating current charging pile calibration system, including the above control pilot testing device and:

[0015] An interface module, which includes a first interface, a second interface, and a third interface, and is used to connect the charging piles to be tested with different standard systems to the testing module;

[0016] A testing module, electrically connected to the interface module, and is used to calibrate the charging piles to be tested connected to the interface module;

[0017] A terminal, which is used to provide corresponding testing requirements for the charging piles to be tested with different standard systems connected to the interface module;

[0018] A communication module, which is used to send the testing instructions of the terminal to the testing module, and upload the testing data and testing equipment status information obtained by the testing module to the terminal;

[0019] A control module, electrically connected to the interface module, and is used to select the first interface, the second interface, or the third interface.

[0020] Further, the first interface is used to connect the charging piles to be tested with the IEC62196-2 standard system; the second interface is used to connect the charging piles to be tested with the SAE J1772 standard system; the third interface is used to connect the charging piles to be tested with the GB / T20234.2-2015 standard system.

[0021] Further, the terminal includes testing software, and the testing software includes

[0022] A first calibration program, which is used to provide the testing requirements for the charging piles to be tested connected to the first interface;

[0023] A second calibration program, which is used to provide the testing requirements for the charging piles to be tested connected to the second interface;

[0024] A third calibration program, which is used to provide the testing requirements for the charging piles to be tested connected to the third interface.

[0025] Further, the user selects the corresponding verification program in the test software according to the to-be-tested charging piles of different standard systems accessing the interface module, and sends test instructions to the control module and the test module through the communication module. The control module controls the contactor of the corresponding standard system interface to close according to the received test instructions; the test module provides the test requirements of the corresponding standard system for the to-be-tested charging pile according to the received test instructions.

[0026] Further, the test module includes the control and guidance test device and the AC standard meter. The AC standard meter is used to conduct metrological verification on the voltage, current, power, and electric energy of the to-be-tested charging pile, and conducts metrological error tests on the to-be-tested charging pile through the electric energy method and the pulse method.

[0027] Further, the test module further includes a resistance simulator. The resistance simulator is used to implement the leakage current test or contact current test of the to-be-tested charging pile. The resistance simulator is connected between the live wire and the ground wire or between the neutral wire and the ground wire, and the resistance value of the resistance simulator is adjusted manually or through the terminal.

[0028] Further, the communication module includes a multi-channel server and a wireless router. The multi-channel server communicates with the control module and the test module through the RS485 bus; the wireless router is connected to the terminal through WIFI or LAN.

[0029] The beneficial effects of the present invention are as follows:

[0030] A control and guidance test device provided by the present invention sends control signals through the controller to simulate the disconnection test of the connection confirmation signal CC, determine the current capacity of the AC charging pile accessed, and detect the voltage at the detection point, realizing the sampling of the voltage signal, current signal, and connection confirmation signal CC of the AC charging pile with multiple standard systems, and testing the charging control state of the charging pile by simulating the voltage magnitudes at each detection point, realizing the compatible verification of the AC charging pile with multiple standard systems, effectively improving the utilization rate of the instrument and equipment, and reducing the equipment cost. Description of the Drawings

[0031] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required to be used in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0032] Figure 1 It is a schematic diagram of a first detection circuit provided by the present invention;

[0033] Figure 2Schematic diagram of a second detection circuit provided by the present invention;

[0034] Figure 3 Schematic diagram of a third detection circuit provided by the present invention;

[0035] Figure 4 Block diagram of an AC charging pile calibration system provided by the present invention. Specific embodiments

[0036] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0037] As an embodiment of the present invention, a control and guidance test device provided by the present invention includes a controller, a load module, a first detection circuit for detecting the connection confirmation signal CC, current, and voltage sent by the charging pile interface, a second detection circuit for detecting the connection confirmation signal CC, current, and voltage sent by the charging pile interface when the load module does not include a battery management system, and a third detection circuit for detecting the control and guidance signal CP sent by the charging pile interface.

[0038] Figure 1 Schematic diagram of a first detection circuit provided by an embodiment of the present invention, as Figure 1 shown, the first detection circuit includes a first sampling interface, a first sampling circuit, a first relay K1, a second relay K2, a first resistor R1, and a second resistor R2. One end of the first relay K1 is connected to the connection confirmation signal CC sent by the charging pile interface, and the other end is grounded; one end of the second relay K2 is connected to the connection confirmation signal CC sent by the charging pile interface, and the other end is connected to the first resistor R1. The other end of the first resistor R1 is connected to an external power supply; one end of the second resistor R2 is connected to the connection confirmation signal CC sent by the charging pile interface, and the other end is grounded; one end of the first sampling circuit is connected to the connection confirmation signal CC sent by the charging pile interface, and the other end is connected to the first sampling interface.

[0039] Preferably, the controller sends a first control signal to the first relay K1 to control the opening and closing of the first relay K1 to simulate the disconnection test of the connection confirmation signal CC; the controller sends a second control signal to the second relay K2. When performing the disconnection test of the connection confirmation signal CC, the second relay K2 is controlled to disconnect, and when testing the resistance value of the second resistor R2, the second relay K2 is controlled to close.

[0040] As an embodiment of the present invention, a first detection point and a second detection point are provided between the second relay K2 and the connection confirmation signal CC sent by the charging pile interface. The first sampling interface is used to determine the current capacity of the AC charging pile connected by measuring the voltage at the second detection point. The first sampling interface is also used to detect the voltage at the second detection point when performing the disconnection test of the connection confirmation signal CC.

[0041] Figure 2 A schematic diagram of a second detection circuit provided by the present invention is shown in Figure 2 As shown, the second detection circuit includes a second sampling interface, a second sampling circuit, a third resistor R3, a fourth resistor R4, and a first switch S1. One end of the third resistor R3 is connected to the connection confirmation signal CC sent by the charging pile interface, and the other end is connected to the first switch S1. The other end of the first switch S1 is grounded, and the fourth resistor R4 is connected in parallel across the first switch S1. One end of the second sampling circuit is connected to the connection confirmation signal CC sent by the charging pile interface, and the other end is connected to the second sampling interface.

[0042] Preferably, the controller sends a third control signal to the first switch S1 to control the first switch S1 to close when the load module includes a battery management system, and to control the first switch S1 to open when the load module does not include a battery management system. The first detection point is located between the third resistor R3 and the connection confirmation signal CC sent by the charging pile interface, and the second sampling interface is used to detect the voltage and charging status at the first detection point.

[0043] Figure 3 A schematic diagram of a third detection circuit provided by the present invention is shown in Figure 3As shown in the figure, the third detection circuit includes a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, a third relay K3, a fourth relay K4, a fifth relay K5, a sixth relay K6, a second switch S2, a first comparison circuit, a third sampling circuit, a fourth sampling circuit, a third sampling interface, a fourth sampling interface, and a fifth sampling interface; one end of the fifth resistor R5 is connected to the control pilot signal CP sent by the charging pile interface, and the other end is connected to the third relay K3; the other end of the third relay K3 is grounded; one end of the third sampling circuit is connected to the control pilot signal CP sent by the charging pile interface, and the other end is connected to the third sampling interface; one end of the first comparison circuit is connected to the control pilot signal CP sent by the charging pile interface, and the other end is connected to the fourth sampling interface; one end of the fourth relay K4 is connected to the control pilot signal CP sent by the charging pile interface, and the other end is connected to the positive electrode of the diode; the negative electrode of the diode is connected to one end of the fourth sampling circuit, and the other end of the fourth sampling circuit is connected to the fifth sampling interface; one end of the sixth relay K6 is connected to the analog voltage, and the other end is connected to the sixth resistor R6; the sixth resistor R6 is connected in series with the fifth relay K5 and in parallel with the seventh resistor R7; the seventh resistor R7 is connected in series with the second switch S2; one end of the sixth resistor R6 and the seventh resistor R7 is connected to the negative electrode of the diode, and the other ends of the fifth relay K5 and the second switch S2 are grounded.

[0044] Preferably, the controller sends a fourth control signal to the third relay K3 to simulate the grounding test of the control pilot signal CP by controlling the closing of the third relay K3; the controller sends a fifth control signal to the fourth relay K4 to simulate the disconnection test of the control pilot signal CP by controlling the opening of the fourth relay K4; the controller sends a sixth control signal to the fifth relay K5 and a seventh control signal to the second switch S2 to simulate the PE broken needle test and the disconnection test of the charging interface by controlling the opening of the fifth relay K5 and the second switch S2. When the load module does not include a battery management system, the fifth relay K5 and the second switch S2 are in the open state.

[0045] As an embodiment of the present invention, a third detection point is provided between the negative electrode of the diode and the fourth sampling circuit. The controller sends an eighth control signal to the sixth relay K6 to control the sixth relay K6 to open, connect the analog voltage to the third detection point, and complete the control pilot signal CP loop voltage limit test by adjusting the magnitude of the analog voltage. A fourth detection point is provided between the third sampling circuit and the control pilot signal CP sent by the charging pile interface. The third sampling interface is used to measure the positive and negative pulse amplitudes and duty cycles of the fourth detection point; the fourth sampling interface is used to measure the PWM parameters of the fourth detection point, including: frequency, duty cycle, rise time, and fall time; the fifth sampling interface is used to measure the positive pulse amplitude and duty cycle of the signal at the third detection point.

[0046] As an embodiment of the present invention, Figure 4 It is a block diagram of an alternating current charging pile verification system, including an interface module for connecting to an external charging pile to be verified; a test module electrically connected to the interface module for verifying the charging pile to be verified connected to the interface module; a terminal connected to the communication module for providing corresponding test requirements for the charging piles to be verified with different standard systems connected to the interface module; a communication module connected to the terminal, the test module, and the control module for sending the test instructions of the terminal to the test module and uploading the test data and test equipment status information obtained by the test module to the terminal, and a control module electrically connected to the interface module.

[0047] Preferably, the interface module includes a first interface, a second interface, and a third interface for connecting charging piles to be verified with different standard systems to the test module; the first interface is used to connect the charging pile to be verified of the IEC62196-2 standard system; the second interface is used to connect the charging pile to be verified of the SAE J1772 standard system; the third interface is used to connect the charging pile to be verified of the GB / T20234.2-2015 standard system.

[0048] As an embodiment of the present invention, on the basis of including a control and guidance test device provided by the embodiment of the present invention, the test module further includes an alternating current standard meter and a resistance simulator. The alternating current standard meter is used for metrological verification of the voltage, current, power, and electric energy of the charging pile to be verified, and conducts metrological error tests on the charging pile to be verified through the electric energy method and the pulse method; the resistance simulator is used to realize the leakage current test or contact current test of the charging pile to be verified. The resistance simulator is connected between the live wire and the ground wire or between the neutral wire and the ground wire, and the resistance value of the resistance simulator is adjusted manually or by the terminal.

[0049] Among them, when the load module in the control and guidance test device tests the charging pile, it is the main power-consuming device. During the test, the corresponding gear is selected manually or through computer test software to conduct a loaded test on the charging pile to be verified. As stipulated in the American standard SAE-J1772-2012, when the rated voltage of the charging pile to be verified is single-phase 120VAC, the maximum load is 16A; when the rated voltage of the charging pile to be verified is two-phase 240VAC, the maximum load is 80A; as stipulated in the European standard IEC61851-1, when the rated voltage of the charging pile to be verified is single-phase 230VAC, the maximum load is 70A, and when the rated voltage of the charging pile to be verified is two-phase 380VAC, the maximum load is 63A; as stipulated in the national standard GB / T20234.2-2015, when the rated voltage of the charging pile to be verified is single-phase 250VAC, the maximum load is 32A, and when the rated voltage of the charging pile to be verified is two-phase 440VAC, the maximum load is 63A.

[0050] Preferably, the terminal includes a test software for providing corresponding test requirements for the to-be-tested charging piles of different standard systems accessing the interface module; the test software includes a first verification program, a second verification program, and a third verification program. The first verification program is used to provide test requirements for the to-be-tested charging piles accessing the first interface; the second verification program is used to provide test requirements for the to-be-tested charging piles accessing the second interface; the third verification program is used to provide test requirements for the to-be-tested charging piles accessing the third interface.

[0051] Preferably, the communication module is used to send the test instructions of the terminal to the test module, and upload the test data and test equipment status information obtained by the test module to the terminal; the communication module includes a multiplex server and a wireless router. The multiplex server communicates with the control module and the test module through the RS485 bus; the wireless router is connected to the terminal through WIFI / LAN.

[0052] An AC charging pile verification device provided by an embodiment of the present invention, the control module is electrically connected to the interface module, and is used to select the first interface, the second interface, or the third interface. The user selects the corresponding verification program in the test software according to the to-be-tested charging piles of different standard systems accessing the interface module, and sends test instructions to the control module and the test module through the communication module. The control module controls the contactor of the corresponding standard system interface to close according to the received test instructions; the test module provides the test requirements of the corresponding standard system for the to-be-tested charging piles according to the received test instructions.

[0053] Preferably, an AC charging pile verification system provided by this embodiment further includes a status indication module connected to the control module through a control line. The status indication module is a three-color lamp and is controlled by the control module. The constant-on state of the red light of the three-color lamp indicates that the test result is unqualified; the flashing state of the yellow light indicates that the test process is in progress; the constant-on state of the yellow light indicates that the verification system is waiting for testing; the constant-on state of the green light indicates that the test result is qualified.

[0054] A control and guidance test device AC charging pile verification system provided by the present invention sends control signals through a controller to simulate the connection confirmation signal CC disconnection test, the control and guidance signal CP grounding test, the control and guidance signal CP disconnection test, and the control and guidance signal CP loop voltage limit test, determines the current capacity of the accessed AC charging pile and the voltage at the detection point, realizes the sampling of the voltage signal, current signal, connection confirmation signal CC, and control and guidance signal CP of the AC charging pile of multiple standard systems, and realizes the compatible verification of the AC charging pile of multiple standard systems through the selection of the interface and the verification program, effectively improving the utilization rate of the instrument equipment and reducing the equipment cost.

[0055] The above has introduced in detail a control and guidance test device and an AC charging pile calibration system disclosed in the embodiments of the present invention. However, it is only used as an example, and the present invention is not limited to the specific implementation manners described above. For those skilled in the art, equivalent modifications or substitutions made to the present invention based on the idea of the present invention are also within the scope of the present invention. Therefore, all equivalent transformations, modifications, improvements, etc. made without departing from the spirit and principles of the present invention should be covered within the scope of the present invention. In summary, the content of this specification should not be construed as a limitation to the present invention.

Claims

1. A control and guidance test device, characterized in that, It includes a controller, a load module, and a first detection circuit. The first detection circuit is used to detect the connection confirmation signal CC, current, and voltage sent by the charging pile interface. The first detection circuit includes a first sampling interface, a first sampling circuit, a first relay K1, a second relay K2, a first resistor R1, and a second resistor R2. One end of the first relay K1 is connected to the connection confirmation signal CC sent by the charging pile interface, and the other end is grounded; one end of the second relay K2 is connected to the connection confirmation signal CC sent by the charging pile interface, and the other end is connected to the first resistor R1. The other end of the first resistor R1 is connected to an external power supply; one end of the second resistor R2 is connected to the connection confirmation signal CC sent by the charging pile interface, and the other end is grounded; one end of the first sampling circuit is connected to the connection confirmation signal CC sent by the charging pile interface, and the other end is connected to the first sampling interface; The controller sends a first control signal to the first relay K1 to control the opening and closing of the first relay K1 to simulate the disconnection test of the connection confirmation signal CC; The controller sends a second control signal to the second relay K2. When performing the disconnection test of the connection confirmation signal CC, it controls the second relay K2 to disconnect. When testing the resistance value of the second resistor R2, it controls the second relay K2 to close; A first detection point and a second detection point are provided between the second relay K2 and the connection confirmation signal CC sent by the charging pile interface. The first sampling interface is used to determine the current capacity of the AC charging pile connected by measuring the voltage of the second detection point; The first sampling interface is also used to detect the voltage of the second detection point during the disconnection test of the connection confirmation signal CC; The device further includes a second detection circuit for detecting the connection confirmation signal CC, current, and voltage sent by the charging pile interface when the load module does not include a battery management system. The second detection circuit includes a second sampling interface, a second sampling circuit, a third resistor R3, a fourth resistor R4, and a first switch S1. One end of the third resistor R3 is connected to the connection confirmation signal CC sent by the charging pile interface, and the other end is connected to the first switch S1; the other end of the first switch S1 is grounded, and the fourth resistor R4 is connected in parallel across the first switch S1; one end of the second sampling circuit is connected to the connection confirmation signal CC sent by the charging pile interface, and the other end is connected to the second sampling interface; The controller sends a third control signal to the first switch S1. When the load module includes a battery management system, it controls the first switch S1 to close; when the load module does not include a battery management system, it controls the first switch S1 to open; The first detection point is located between the third resistor R3 and the connection confirmation signal CC sent by the charging pile interface. The second sampling interface is used to detect the voltage and charging status of the first detection point.

2. The control and guidance test device according to claim 1, wherein The device further includes a third detection circuit for detecting the control pilot signal CP sent by the charging pile interface, which includes a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, a third relay K3, a fourth relay K4, a fifth relay K5, a sixth relay K6, a second switch S2, a first comparison circuit, a third sampling circuit, a fourth sampling circuit, a third sampling interface, a fourth sampling interface, and a fifth sampling interface; one end of the fifth resistor R5 is connected to the control pilot signal CP sent by the charging pile interface, and the other end is connected to the third relay K3; the other end of the third relay K3 is grounded; one end of the third sampling circuit is connected to the control pilot signal CP sent by the charging pile interface, and the other end is connected to the third sampling interface; one end of the first comparison circuit is connected to the control pilot signal CP sent by the charging pile interface, and the other end is connected to the fourth sampling interface; one end of the fourth relay K4 is connected to the control pilot signal CP sent by the charging pile interface, and the other end is connected to the positive electrode of a diode; the negative electrode of the diode is connected to one end of the fourth sampling circuit, and the other end of the fourth sampling circuit is connected to the fifth sampling interface; one end of the sixth relay K6 is connected to an analog voltage, and the other end is connected to the sixth resistor R6; the sixth resistor R6 is in series with the fifth relay K5 and in parallel with the seventh resistor R7; the seventh resistor R7 is in series with the second switch S2; one end of the sixth resistor R6 and the seventh resistor R7 is connected to the negative electrode of the diode, and the other ends of the fifth relay K5 and the second switch S2 are grounded; The controller sends a fourth control signal to the third relay K3 to simulate the grounding test of the control pilot signal CP by controlling the closing of the third relay K3; the controller sends a fifth control signal to the fourth relay K4 to simulate the disconnection test of the control pilot signal CP by controlling the opening of the fourth relay K4; the controller sends a sixth control signal to the fifth relay K5 and a seventh control signal to the second switch S2 to simulate the PE broken pin test and the disconnection test of the charging interface by controlling the opening of the fifth relay K5 and the second switch S2. When the load module does not include a battery management system, the fifth relay K5 and the second switch S2 are in the open state; a third detection point is provided between the negative electrode of the diode and the fourth sampling circuit. The controller sends an eighth control signal to the sixth relay K6 to control the sixth relay K6 to open, connect the analog voltage to the third detection point, and complete the voltage limit test of the control pilot signal CP loop by adjusting the magnitude of the analog voltage; A fourth detection point is provided between the third sampling circuit and the control pilot signal CP sent by the charging pile interface. The third sampling interface is used to measure the positive and negative pulse amplitudes and duty cycle of the fourth detection point; The fourth sampling interface is used to measure the PWM parameters of the fourth detection point, including: frequency, duty cycle, rise time, and fall time; the fifth sampling interface is used to measure the positive pulse amplitude and duty cycle of the signal at the third detection point.

3. An alternating current charging pile calibration system, characterized in that, Including the control and guidance test device according to any one of claims 1-2, further comprising: An interface module, the interface module includes a first interface, a second interface, and a third interface, and is used to connect the charging piles to be tested with different standard systems to the test module; A test module, electrically connected to the interface module, and is used to calibrate the charging piles to be tested connected to the interface module; A terminal, used to provide corresponding test requirements for the charging piles to be tested with different standard systems connected to the interface module; A communication module, used to send the test instructions of the terminal to the test module, and upload the test data and test equipment status information obtained by the test module to the terminal; A control module, electrically connected to the interface module, and is used to select the first interface, the second interface, or the third interface.

4. The AC charging pile calibration system according to claim 3, characterized in that, The first interface is used to connect the charging pile to be tested with the IEC62196-2 standard system; the second interface is used to connect the charging pile to be tested with the SAE J1772 standard system; the third interface is used to connect the charging pile to be tested with the GB / T20234.2-2015 standard system.

5. The AC charging pile calibration system according to claim 4, characterized in that, The terminal includes test software, and the test software includes A first calibration program, used to provide the test requirements for the charging pile to be tested connected to the first interface; A second calibration program, used to provide the test requirements for the charging pile to be tested connected to the second interface; A third calibration program, used to provide the test requirements for the charging pile to be tested connected to the third interface.

6. The AC charging pile calibration system according to claim 5, wherein, The user selects the corresponding calibration program in the test software according to the charging piles to be tested with different standard systems connected to the interface module, and sends test instructions to the control module and the test module through the communication module. The control module controls the contactor of the corresponding standard system interface to close according to the received test instructions; the test module provides the test requirements of the corresponding standard system for the charging pile to be tested according to the received test instructions.

7. The AC charging pile calibration system according to claim 3, wherein The test module includes the control and guidance test device and an AC standard meter. The AC standard meter is used to perform metrological calibration on the voltage, current, power, and electric energy of the charging pile to be tested, and perform metrological error tests on the charging pile to be tested through the electric energy method and the pulse method.

8. The AC charging pile calibration system according to claim 3, characterized in that, The test module further includes a resistance simulator. The resistance simulator is used to implement the leakage current test or contact current test of the charging pile to be tested. The resistance simulator is connected between the live wire and the ground wire or between the neutral wire and the ground wire, and the resistance value of the resistance simulator is adjusted manually or through the terminal.

9. The AC charging pile calibration system according to claim 3, wherein The communication module includes a multi-channel server and a wireless router. The multi-channel server communicates with the control module and the test module through the RS485 bus; the wireless router is connected to the terminal through WIFI or LAN.

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