Metrological verification system of electric vehicle charger

Abstract

The utility model discloses a metrological verification system of an electric vehicle charger, which is characterized by comprising a charging interface simulator, a high-precision metering chip, a vehicle-mounted battery voltage simulator, a control guide resistor simulator and a vehicle-mounted communication simulator, the charging interface simulator is connected with the charger, the direct-current power supply end of the charging interface simulator is connected with the load, the high-precision metering chip and the vehicle-mounted battery voltage simulator are both connected with the direct-current power supply end of the charging interface simulator, and the vehicle-mounted communication simulator is connected with the charging communication end of the charging interface simulator. The control guide resistor simulator is connected with the charging connection confirmation end of the charging interface simulator. According to the utility model, the test environment required by an electric automobile and a test item can be simulated, and metering verification of the charger is facilitated.

Description

Technical Field

[0001] The utility model belongs to the technical field of electric vehicle charging, in particular to a measurement and verification system for an electric vehicle charger. Background Art

[0002] With the development of electric vehicles, the market demand for electric vehicle charging equipment continues to increase, resulting in an increasing demand for charger metrology and verification. Charger metrology and verification is an important means of testing new energy vehicles, and how to improve the quality of chargers has become an important factor affecting the sales of electric vehicles.

[0003] In the prior art, if actual vehicle and on-board detection data are used for metrological verification testing, the accuracy of the metrological test is difficult to guarantee, and there is a lack of independent credibility of third-party testing. If the charging interface is extended by branching and various external test instruments are used, not only is the wiring complicated and lacks safety, but the operating process is complicated and difficult to carry, which is not conducive to the development and implementation of on-site metrological verification work. Summary of the invention

[0004] The utility model aims to provide a metrological verification system for an electric vehicle charger, which can simulate the electric vehicle and the test environment required by the test project, so as to facilitate the metrological verification of the charger.

[0005] The technical solutions to achieve the above objectives include the following:

[0006] The metrological verification system of electric vehicle charger includes: charging interface simulator, high-precision metering chip, on-board battery voltage simulator, control guide resistance simulator and on-board communication simulator;

[0007] The charging interface simulator is connected to the charger, the DC power supply end of the charging interface simulator is connected to the load, the high-precision metering chip and the on-board battery voltage simulator are both connected to the DC power supply end of the charging interface simulator, the on-board communication simulator is connected to the charging communication end of the charging interface simulator, and the control steering resistance simulator is connected to the charging connection confirmation end of the charging interface simulator.

[0008] In some embodiments, the vehicle-mounted battery voltage simulator includes: a voltage simulation control chip, an electrical isolation circuit, a DC high-voltage power supply circuit, and a voltage control circuit;

[0009] The input end of the electrical isolation circuit is connected to the DC power supply end of the charging interface simulator, the feedback end of the electrical isolation circuit is connected to the voltage simulation control chip, the voltage simulation control chip is connected to the control end of the voltage control circuit, the input end of the voltage control circuit is connected to the power supply, the output end of the voltage control circuit is connected to the input end of the DC high-voltage power supply circuit, and the output end of the DC high-voltage power supply circuit is connected to the electrical isolation circuit.

[0010] In some embodiments, the voltage control circuit includes: a voltage control chip, a first light emitting diode, a second light emitting diode, a first resistor, a second resistor, a first capacitor, a second capacitor, a third capacitor, a fourth capacitor and an EMC filter;

[0011] The first pin of the voltage control chip is connected to the voltage analog control chip, the second pin is connected to the third pin via the first capacitor, the second pin and the third pin are both connected to the power supply, the fourth pin is connected to the first pin of the EMC filter, the fifth pin is connected to the second pin of the EMC filter, and the fourth pin is also connected to the fifth pin via the second capacitor;

[0012] The anode of the first light emitting diode is connected to the third pin of the voltage control chip through the first resistor, and the cathode of the first light emitting diode is connected to the second pin of the voltage control chip;

[0013] The third pin of the EMC filter is connected to the fourth pin via a third capacitor, the fourth capacitor is connected in parallel with the third capacitor, and the third pin and the fourth pin are both connected to the input end of the DC high-voltage power supply circuit;

[0014] The anode of the second light emitting diode is connected to the fourth pin of the voltage control chip through the second resistor, and the cathode is connected to the fifth pin of the voltage control chip.

[0015] In some embodiments, the DC high-voltage power supply circuit includes: a high-voltage power supply chip; the third pin of the high-voltage power supply chip is connected to the ground terminal, the sixth pin and the seventh pin of the high-voltage power supply chip are both connected to the output terminal of the voltage control circuit, and the eighth pin and the ninth pin of the high-voltage power supply chip are both connected to the control terminal of the electrical isolation circuit.

[0016] In some embodiments, the electrical isolation circuit includes: a switch circuit, an isolation chip, a resistor, a first optical coupler, a second optical coupler, a fourth light emitting diode, a fourth resistor, a fifth resistor, and a sixth resistor;

[0017] The input end of the isolation chip is connected to the DC power supply end of the charging interface simulator through a resistor, the first output end of the isolation chip is connected to the first pin of the first optical coupler through a fifth resistor, the first output end of the isolation chip is connected to the first pin of the second optical coupler through a sixth resistor, the second output end of the isolation chip is connected to the input end of the switch circuit, and the output end of the switch circuit is connected to the voltage simulation control chip;

[0018] The second pin of the first optical coupler is connected to the first voltage terminal, the third pin thereof is connected to the output terminal of the DC high voltage power supply circuit, and the fourth pin thereof is connected to the second voltage terminal;

[0019] The second pin of the second optical coupler is connected to the first voltage terminal, the third pin thereof is connected to the output terminal of the DC high voltage power supply circuit, and the fourth pin thereof is connected to the third voltage terminal;

[0020] The anode of the fourth light emitting diode is connected to the first voltage terminal through a fourth resistor, and the cathode of the fourth light emitting diode is connected to the first output terminal of the isolation chip.

[0021] In some embodiments, the switch circuit includes: a first relay, a third light emitting diode, and a third resistor;

[0022] The first pin of the first relay is connected to the second output terminal of the isolation chip, the second pin thereof is connected to the first voltage terminal, and the third and fourth pins thereof are connected to the voltage simulation control chip;

[0023] The anode of the third light emitting diode is connected to the first voltage terminal through the third resistor, and the cathode of the third light emitting diode is connected to the second output terminal of the isolation chip.

[0024] In some embodiments, the control-steering resistance simulator includes: connecting a switch, a resistance network circuit, and a first switch controller;

[0025] The charging connection confirmation end of the charging interface simulator is connected to the resistance network circuit through a connection switch, and the first switch controller is magnetically connected to the connection switch.

[0026] In some embodiments, the resistor network circuit includes: a plurality of resistor circuits, wherein the plurality of resistor circuits are sequentially connected in series to form a series circuit, wherein a first end of the series circuit is connected to a charging connection confirmation end via a connection switch, and a second end of the series circuit is grounded.

[0027] In some embodiments, the resistance circuit includes: a control switch, a steering resistor, and a second switch controller;

[0028] The guiding resistors in the plurality of resistance circuits are connected in series in sequence, the control switch is connected in parallel with the corresponding guiding resistor, and the second switch controller is magnetically connected with the corresponding control switch.

[0029] In some embodiments, it also includes: a data transceiver device, a temperature and humidity collection device and a GPS device; the temperature and humidity collection device and the GPS device are both connected to the data transceiver device.

[0030] The technical solution provided by the utility model has the following advantages and effects: through the setting of a charging interface simulator, an on-board battery voltage simulator, a control guide resistance simulator and an on-board communication simulator, it is possible to simulate an electric vehicle and a test environment required by a simulated test project, without the need to use a real electric vehicle, which facilitates subsequent metrological verification of the charger; through the setting of a high-precision metering chip, it is possible to collect corresponding parameters during the charging process, and then compare them with the qualified indicators required by the national standards, thereby obtaining test results and realizing metrological verification testing of the charger. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The accompanying drawings herein show specific examples of the technical solutions described in the present utility model, and together with the specific implementation methods constitute a part of the specification, and are used to explain the technical solutions, principles and effects of the present utility model.

[0032] Unless otherwise specified or defined, the same reference numerals in different drawings represent the same or similar technical features, and the same or similar technical features may also be represented by different reference numerals.

[0033] Figure 1 It is a structural schematic diagram of an embodiment of the utility model;

[0034] Figure 2 It is a structural schematic diagram of a vehicle-mounted battery voltage simulator in an embodiment of the utility model;

[0035] Figure 3 It is a circuit schematic diagram of a voltage control circuit in an embodiment of the utility model;

[0036] Figure 4 It is a circuit schematic diagram of a DC high voltage power supply circuit in an embodiment of the utility model;

[0037] Figure 5 It is a circuit schematic diagram of an electrical isolation circuit in an embodiment of the utility model;

[0038] Figure 6 It is a circuit schematic diagram of a control guide resistance simulator in an embodiment of the utility model;

[0039] Figure 7 It is a circuit principle diagram of the resistor network circuit in the embodiment of the utility model.

[0040] Description of reference numerals:

[0041] U1, voltage control chip; U2, high voltage power chip; U3, isolation chip; L, EMC filter; K1, connection switch; K2, control switch; R7, guide resistor; U4, first relay; U5, first optical coupler; U6, second optical coupler; RN, resistor; LED1, first light emitting diode; LED2, second light emitting diode; LED3, third light emitting diode; LED4, fourth light emitting diode; C1, first capacitor;

[0042] C2, second capacitor; C3, third capacitor; C4, fourth capacitor; R1, first resistor; R2, second resistor;

[0043] R3, the third resistor; R4, the fourth resistor; R5, the fifth resistor; R6, the sixth resistor; R7, the seventh resistor; DETAILED DESCRIPTION

[0044] In order to facilitate the understanding of the present invention, specific embodiments of the present invention will be described in more detail below with reference to the accompanying drawings.

[0045] Unless otherwise specified or defined, the "first, second..." used in this article is merely used to distinguish names and does not represent a specific quantity or order.

[0046] Unless specifically stated or defined otherwise, the term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0047] It should be noted that when a component is considered to be "fixed to" another component, it can be directly fixed to the other component or there can be a central component; when an component is considered to be "connected to" another component, it can be directly connected to the other component or there can be a central component at the same time; when an component is considered to be "installed on" another component, it can be directly installed on the other component or there can be a central component at the same time. When an component is considered to be "set on" another component, it can be directly set on the other component or there can be a central component at the same time.

[0048] like Figure 1 As shown, the embodiment of the utility model provides a measurement and verification system for an electric vehicle charger, including: a charging interface simulator, a high-precision measurement chip, an on-board battery voltage simulator, a control guide resistance simulator and an on-board communication simulator;

[0049] The charging interface simulator is connected to the charger, the DC power supply end of the charging interface simulator is connected to the load, and the load is a high-power DC load. The high-precision metering chip and the on-board battery voltage simulator are both connected to the DC power supply end of the charging interface simulator, the on-board communication simulator is connected to the charging communication end of the charging interface simulator, and the control steering resistance simulator is connected to the charging connection confirmation end of the charging interface simulator.

[0050] In actual application, the charging interface simulator is used to connect to the charger, and a charging gun holder and an electrical parameter collection interface are provided on the charging interface simulator, and the charging gun holder includes: a DC power supply positive socket; a DC power supply negative socket; a protective conductor, equipment ground or PE socket; a charging communication CAN_H socket; a charging communication CAN_L socket; a first charging connection confirmation socket; a second charging connection confirmation socket; the electrical parameter collection interface includes: a DC power supply positive interface (DC+); a DC power supply negative interface (DC-); a protective conductor, equipment ground or PE interface (PE); a charging communication CAN_H interface (S+); a charging communication CAN_L interface (S-); a first charging connection confirmation interface (CC1); a second charging connection confirmation interface (CC2); the DC power supply end is the DC power supply positive interface and the DC power supply negative interface, and the charging communication end is the charging communication CAN_H interface and the charging communication CAN_L Interface, the charging connection confirmation end is the first charging connection confirmation interface and the second charging connection confirmation interface; in this embodiment, the charger adopts a charger of a Class B charging system, and the high-precision metering chip adopts an electric energy metering chip produced by Shenzhen Hangzhi Precision Electronics Co., Ltd., which can be connected to the host computer by wire, and can also be connected to the host computer wirelessly through an external WiFi antenna to achieve real-time interaction with the host computer. The on-board battery voltage simulator is used to simulate the on-board battery voltage, and the control guide resistance simulator can simulate the typical resistance value required by the standard to ensure that the voltage of each charging connection confirmation interface meets the standard requirements. The on-board communication simulator adopts an on-board BMS communication simulator, which is used to communicate with the charger for BMS and CAN message communication. The on-board battery voltage simulator, the on-board communication simulator, and the control guide resistance simulator can all be connected to the host computer by wire or wirelessly to achieve data interaction with the host computer.

[0051] Through the setting of charging interface simulator, on-board battery voltage simulator, control guide resistance simulator and on-board communication simulator, it is possible to simulate electric vehicles of Class B charging system and simulate the test environment required by the test project, so as to facilitate the subsequent metrological verification of the charger of Class B charging system. Through the setting of high-precision metering chip, it is possible to collect corresponding parameters during the charging process without the need for external various test instruments, and then compare them with the qualified indicators required by national standards to obtain the test results, so as to realize the metrological verification test of the charger of Class B charging system.

[0052] Furthermore, if Figure 2 As shown, the vehicle-mounted battery voltage simulator includes: a voltage simulation control chip, an electrical isolation circuit, a DC high-voltage power supply circuit and a voltage control circuit;

[0053] The input end of the electrical isolation circuit is connected to the DC power supply end of the charging interface simulator, the feedback end of the electrical isolation circuit is connected to the voltage simulation control chip, the voltage simulation control chip is connected to the control end of the voltage control circuit, the input end of the voltage control circuit is connected to the power supply, the output end of the voltage control circuit is connected to the input end of the DC high-voltage power supply circuit, and the output end of the DC high-voltage power supply circuit is connected to the electrical isolation circuit.

[0054] Specifically, the feedback end of the electrical isolation circuit and the voltage control circuit can be connected to the voltage simulation control chip. The voltage simulation control chip can adopt a CPU or other chips. After the electrical isolation circuit is connected to the charger through the charging interface simulator, the voltage simulation control chip receives the corresponding feedback signal, and then controls the voltage control circuit to output a DC control voltage based on the feedback signal, driving the DC high-voltage power supply circuit to output a large voltage signal with a signal amplitude of 0-1000V to simulate the vehicle battery voltage.

[0055] Furthermore, if Figure 3 As shown, the voltage control circuit includes: a voltage control chip U1, a first light emitting diode LED1, a second light emitting diode LED2, a first resistor R1, a second resistor R2, a first capacitor C1, a second capacitor C2, a third capacitor C3, a fourth capacitor C4 and an EMC filter L;

[0056] The first pin of the voltage control chip U1 is connected to the voltage analog control chip, the second pin is connected to the third pin through the first capacitor C1, the second pin and the third pin are both connected to the power supply, the fourth pin is connected to the first pin of the EMC filter L, the fifth pin is connected to the second pin of the EMC filter L, and the fourth pin is also connected to the fifth pin through the second capacitor C2;

[0057] The anode of the first light emitting diode LED1 is connected to the third pin of the voltage control chip U1 through the first resistor R1, and the cathode thereof is connected to the second pin of the voltage control chip U1;

[0058] The third pin of the EMC filter L is connected to the fourth pin thereof through the third capacitor C3, the fourth capacitor C4 is connected in parallel with the third capacitor C3, and the third pin and the fourth pin thereof are both connected to the input end of the DC high voltage power supply circuit;

[0059] The anode of the second light emitting diode LED2 is connected to the fourth pin of the voltage control chip U1 through the second resistor R2, and the cathode is connected to the fifth pin of the voltage control chip U1.

[0060] Specifically, in this embodiment, the voltage control chip U1 adopts a chip of URB2424LD-30WR3 model. The first pin of the voltage control chip U1 is a control pin. The voltage control circuit can be turned off and on according to the control signal output by the voltage analog control chip. The second and third pins of the voltage control chip U1 are output ends of the voltage control circuit. The third and fourth pins of the EMC filter L are output ends of the voltage control circuit. The second pin of the voltage control chip U1 is connected to the negative end of the power supply, and the third pin is connected to the positive end of the power supply. The power supply is used to supply power to the voltage control chip U1. After receiving the control instruction issued by the voltage analog control chip, the first pin of the voltage control chip U1 The voltage control chip U1 outputs a corresponding voltage, and outputs the DC control voltage required by the DC high-voltage power supply circuit after filtering through the second capacitor C2, the EMC filter L, the third capacitor C3 and the fourth capacitor C4. Through the setting of the first light-emitting diode LED1, it can be detected whether the power supply is normally supplying power to the voltage control chip U1. When the power supply is normal, the first light-emitting diode LED1 lights up, otherwise, the first light-emitting diode LED1 is off. Through the setting of the second light-emitting diode LED2, it can be detected whether the voltage control chip U1 outputs the corresponding voltage normally. When the corresponding voltage is output normally, the second light-emitting diode LED2 lights up, otherwise, the second light-emitting diode LED2 is off.

[0061] Furthermore, if Figure 4 As shown, the DC high-voltage power supply circuit includes: a high-voltage power supply chip U2; the third pin of the high-voltage power supply chip U2 is connected to the ground terminal, the sixth pin and the seventh pin of the high-voltage power supply chip U2 are both connected to the output end of the voltage control circuit, and the eighth pin and the ninth pin of the high-voltage power supply chip U2 are both connected to the control end of the electrical isolation circuit.

[0062] Specifically, the high-voltage power supply chip U2 adopts a KDNM-H series chip, the sixth and seventh pins of the high-voltage power supply chip U2 are the input ends of the DC high-voltage power supply circuit, the sixth pin of the high-voltage power supply chip U2 is connected to the third pin of the EMC filter L, the seventh pin of the high-voltage power supply chip U2 is connected to the fourth pin of the EMC filter L, the eighth and ninth pins of the high-voltage power supply chip U2 are the output ends of the DC high-voltage power supply circuit, which are used to output large voltage signals and act on the charging interface simulator through an electrical isolation circuit.

[0063] Furthermore, if Figure 5 As shown, the electrical isolation circuit includes: a switch circuit, an isolation chip U3, a resistor RN, a first optical coupler U5, a second optical coupler U6, a fourth light emitting diode LED4, a fourth resistor R4, a fifth resistor R5 and a sixth resistor R6;

[0064] The input end of the isolation chip U3 is connected to the DC power supply end of the charging interface simulator through the resistor RN, the first output end of the isolation chip U3 is connected to the first pin of the first optical coupler U5 through the fifth resistor R5, the first output end of the isolation chip U3 is connected to the first pin of the second optical coupler U6 through the sixth resistor R6, the second output end of the isolation chip U3 is connected to the input end of the switch K1 circuit, and the output end of the switch circuit is connected to the voltage simulation control chip;

[0065] The second pin of the first optical coupler U5 is connected to the first voltage terminal, the third pin thereof is connected to the output terminal of the DC high voltage power supply circuit, and the fourth pin thereof is connected to the second voltage terminal;

[0066] The second pin of the second optical coupler U6 is connected to the first voltage terminal, the third pin thereof is connected to the output terminal of the DC high voltage power supply circuit, and the fourth pin thereof is connected to the third voltage terminal;

[0067] The anode of the fourth light emitting diode LED4 is connected to the first voltage terminal via the fourth resistor R4, and the cathode of the fourth light emitting diode LED4 is connected to the first output terminal of the isolation chip U3.

[0068] Specifically, the first voltage end can be the output voltage of the fourth pin of the EMC filter L of the voltage control circuit, the model of the isolation chip U3 can be ULN2830A, the first pin of the resistor RN is connected to the positive interface of the DC power supply, the second pin of the resistor RN is connected to the sixth pin of the isolation chip U3, the fifth pin of the resistor RN is connected to the negative interface of the DC power supply, the sixth pin of the resistor RN is connected to the eighth pin of the isolation chip U3, the thirteenth pin of the isolation chip U3 serves as the first output end of the isolation chip U3, and the eleventh pin of the isolation chip U3 serves as the second output end of the isolation chip U3. After the isolation chip U3 is connected to the charger through the resistor RN and the charging interface simulator, the second output end of the isolation chip U3 controls the switch K2 circuit to open or close, and the output end of the switch circuit serves as the feedback end of the electrical isolation circuit. After receiving the opening signal or closing signal of the switch circuit, the voltage simulation control chip controls the voltage control circuit to simulate the charging of the vehicle battery voltage, and the first output end of the isolation chip U3 also outputs a corresponding signal to control the first optical coupler U5 and the second optical coupler U6 to be turned on, thereby achieving the function of isolation protection.

[0069] Furthermore, if Figure 5 As shown, the switch circuit includes: a first relay U4, a third light emitting diode LED3 and a third resistor R3;

[0070] The first pin of the first relay U4 is connected to the second output terminal of the isolation chip U3, the second pin thereof is connected to the first voltage terminal, and the third and fourth pins thereof are connected to the voltage simulation control chip;

[0071] The anode of the third light emitting diode LED3 is connected to the first voltage terminal via the third resistor R3, and the cathode of the third light emitting diode LED3 is connected to the second output terminal of the isolation chip U3.

[0072] Specifically, the third and fourth pins of the first relay U4 serve as feedback ends of the electrical isolation circuit. The third and fourth pins of the first relay U4 are connected to the voltage simulation control chip through interface J. When the eleventh pin of the isolation chip U3 outputs a low level, the internal switch of the first relay U4 is closed. When the eleventh pin of the isolation chip U3 outputs a high level, the internal switch of the first relay U4 is disconnected. By connecting or unplugging the charger, the output signal of the eleventh pin of the isolation chip U3 can be changed, thereby changing the opening and closing state of the internal switch of the relay, that is, controlling the opening or closing of the switch K2 circuit, so that the voltage simulation control chip can control the voltage control circuit according to the feedback signal of the switch circuit whether to start simulating the charging of the vehicle battery.

[0073] Furthermore, if Figure 6 As shown, the control-steering resistance simulator includes: a connecting switch K1, a resistance network circuit and a first switch controller;

[0074] The charging connection confirmation end of the charging interface simulator is connected to the resistance network circuit via the connection switch K1, and the first switch controller is magnetically connected to the connection switch K1.

[0075] Specifically, the charging connection confirmation end has a first charging connection confirmation interface and a second charging connection confirmation interface, the control guide resistance simulator has a connection switch a, a resistance network circuit a and a first switch controller a corresponding to the first charging connection confirmation interface, and the control guide resistance simulator also has a connection switch b, a resistance network circuit b and a first switch controller b corresponding to the second charging connection confirmation interface; in this embodiment, the first switch controller adopts a relay, the first switch controller and the resistance network circuit can be connected to the host computer, and the first switch controller is controlled by the host computer, so that the first switch controller controls the on and off of the first switch, and the resistance network circuit is controlled by the host computer to simulate the typical resistance value required by the standard.

[0076] Furthermore, if Figure 7 As shown, the resistor network circuit includes: a plurality of resistor circuits, the plurality of resistor circuits are sequentially connected in series to form a series circuit, a first end of the series circuit is connected to a charging connection confirmation end through a connection switch K1, and a second end of the series circuit is grounded.

[0077] Specifically, the resistance circuit can be connected to a host computer, and the host computer controls each resistance circuit to control the resistance value simulated by the resistance network circuit. The resistance values ​​of multiple resistance circuits can be the same or different. By setting multiple resistance circuits, the adjustable range and adjustable accuracy of the resistance value simulated by the resistance network circuit can be increased.

[0078] Furthermore, if Figure 7 As shown, the resistance circuit includes: a control switch K2, a steering resistor R7 and a second switch controller;

[0079] The guiding resistors R7 in the plurality of resistance circuits are connected in series in sequence, the control switch K2 is connected in parallel with the corresponding guiding resistor R7, and the second switch controller is magnetically connected with the corresponding control switch K2.

[0080] Specifically, in this embodiment, the second switch controller is also a relay, and the resistance network circuit is provided with 11 resistance circuits connected in series. The resistance values ​​of the guide resistor R7 in the 11 resistance circuits are 1Ω, 2Ω, 4Ω, 8Ω, 16Ω, 32Ω, 64Ω, 128Ω, 256Ω, 512Ω and 1024Ω, respectively, so that the resistance value of the resistance network circuit can be adjusted in the range of 0-2000Ω, and digital adjustment of the resistance value can be realized.

[0081] Furthermore, if Figure 1 As shown, it also includes: a data transceiver device, a temperature and humidity acquisition device and a GPS device; the temperature and humidity acquisition device and the GPS device are both connected to the data transceiver device; the data transceiver device is connected to a high-precision metering chip.

[0082] In practical applications, the temperature and humidity acquisition device includes a temperature sensor and a humidity sensor, which can collect the temperature and humidity of the charger during charging. The GPS device can adopt the GPS device in the existing technology, such as ATGM336H. The data transceiver device can adopt the data transceiver device in the existing technology, such as lora device, Bluetooth device, etc., which can realize communication with the host computer and transmit the temperature and humidity collected by the temperature and humidity acquisition device and the location data collected by the GPS device to the host computer.

[0083] When quoting drawing descriptions, new features that appear are described; in order to avoid repeated quotations of drawings resulting in less concise descriptions, features that have been described clearly will not be quoted in the drawings one by one.

[0084] The purpose of the above embodiments is to exemplarily reproduce and deduce the technical solution of the utility model, and to fully describe the technical solution, purpose and effect of the utility model. Its purpose is to make the public understand the disclosed content of the utility model more thoroughly and comprehensively, and it does not limit the protection scope of the utility model.

[0085] The above embodiments are not exhaustive enumerations based on the present invention, and there may be multiple other implementations not listed. Any replacement and improvement made without violating the concept of the present invention shall fall within the protection scope of the present invention.

Claims

1. The measurement and verification system of electric vehicle charger is characterized by: include: Charging interface simulator, high-precision metering chip, vehicle battery voltage simulator, control guide resistance simulator and vehicle communication simulator; The charging interface simulator is connected to the charger, the DC power supply end of the charging interface simulator is connected to the load, the high-precision metering chip and the on-board battery voltage simulator are both connected to the DC power supply end of the charging interface simulator, the on-board communication simulator is connected to the charging communication end of the charging interface simulator, and the control steering resistance simulator is connected to the charging connection confirmation end of the charging interface simulator.

2. The measurement and verification system for electric vehicle charger according to claim 1, characterized in that: The vehicle-mounted battery voltage simulator comprises: a voltage simulation control chip, an electrical isolation circuit, a DC high-voltage power supply circuit and a voltage control circuit; The input end of the electrical isolation circuit is connected to the DC power supply end of the charging interface simulator, the feedback end of the electrical isolation circuit is connected to the voltage simulation control chip, the voltage simulation control chip is connected to the control end of the voltage control circuit, the input end of the voltage control circuit is connected to the power supply, the output end of the voltage control circuit is connected to the input end of the DC high-voltage power supply circuit, and the output end of the DC high-voltage power supply circuit is connected to the electrical isolation circuit.

3. The measurement and verification system for an electric vehicle charger as claimed in claim 2, characterized in that: The voltage control circuit comprises: a voltage control chip, a first light emitting diode, a second light emitting diode, a first resistor, a second resistor, a first capacitor, a second capacitor, a third capacitor, a fourth capacitor and an EMC filter; The first pin of the voltage control chip is connected to the voltage analog control chip, the second pin is connected to the third pin via the first capacitor, the second pin and the third pin are both connected to the power supply, the fourth pin is connected to the first pin of the EMC filter, the fifth pin is connected to the second pin of the EMC filter, and the fourth pin is also connected to the fifth pin via the second capacitor; The anode of the first light emitting diode is connected to the third pin of the voltage control chip through the first resistor, and the cathode of the first light emitting diode is connected to the second pin of the voltage control chip; The third pin of the EMC filter is connected to the fourth pin via a third capacitor, the fourth capacitor is connected in parallel with the third capacitor, and the third pin and the fourth pin are both connected to the input end of the DC high-voltage power supply circuit; The anode of the second light emitting diode is connected to the fourth pin of the voltage control chip through the second resistor, and the cathode is connected to the fifth pin of the voltage control chip.

4. The measurement and verification system for an electric vehicle charger as claimed in claim 2, characterized in that: The DC high-voltage power supply circuit includes: a high-voltage power supply chip; the third pin of the high-voltage power supply chip is connected to the ground terminal, the sixth pin and the seventh pin of the high-voltage power supply chip are both connected to the output terminal of the voltage control circuit, and the eighth pin and the ninth pin of the high-voltage power supply chip are both connected to the control terminal of the electrical isolation circuit.

5. The measurement and verification system for electric vehicle charger according to claim 2, characterized in that: The electrical isolation circuit comprises: a switch circuit, an isolation chip, a resistor, a first optical coupler, a second optical coupler, a fourth light emitting diode, a fourth resistor, a fifth resistor and a sixth resistor; The input end of the isolation chip is connected to the DC power supply end of the charging interface simulator through a resistor, the first output end of the isolation chip is connected to the first pin of the first optical coupler through a fifth resistor, the first output end of the isolation chip is connected to the first pin of the second optical coupler through a sixth resistor, the second output end of the isolation chip is connected to the input end of the switch circuit, and the output end of the switch circuit is connected to the voltage simulation control chip; The second pin of the first optical coupler is connected to the first voltage terminal, the third pin thereof is connected to the output terminal of the DC high voltage power supply circuit, and the fourth pin thereof is connected to the second voltage terminal; The second pin of the second optical coupler is connected to the first voltage terminal, the third pin thereof is connected to the output terminal of the DC high voltage power supply circuit, and the fourth pin thereof is connected to the third voltage terminal; The anode of the fourth light emitting diode is connected to the first voltage terminal through a fourth resistor, and the cathode of the fourth light emitting diode is connected to the first output terminal of the isolation chip.

6. The measurement and verification system for electric vehicle charger according to claim 5, characterized in that: The switch circuit comprises: a first relay, a third light emitting diode and a third resistor; The first pin of the first relay is connected to the second output terminal of the isolation chip, the second pin thereof is connected to the first voltage terminal, and the third and fourth pins thereof are connected to the voltage simulation control chip; The anode of the third light emitting diode is connected to the first voltage terminal through the third resistor, and the cathode of the third light emitting diode is connected to the second output terminal of the isolation chip.

7. The measurement and verification system for an electric vehicle charger as claimed in claim 1, characterized in that: The control-guided resistance simulator comprises: a connecting switch, a resistance network circuit and a first switch controller; The charging connection confirmation end of the charging interface simulator is connected to the resistance network circuit through a connection switch, and the first switch controller is magnetically connected to the connection switch.

8. The measurement and verification system for an electric vehicle charger as claimed in claim 7, characterized in that: The resistor network circuit includes: a plurality of resistor circuits, wherein the plurality of resistor circuits are sequentially connected in series to form a series circuit, wherein a first end of the series circuit is connected to a charging connection confirmation end via a connection switch, and a second end of the series circuit is grounded.

9. The measurement and verification system for an electric vehicle charger as claimed in claim 8, characterized in that: The resistance circuit includes: a control switch, a guide resistor and a second switch controller; The guiding resistors in the plurality of resistance circuits are connected in series in sequence, the control switch is connected in parallel with the corresponding guiding resistor, and the second switch controller is magnetically connected with the corresponding control switch.

10. The metrological verification system for an electric vehicle charger according to any one of claims 1 to 9, characterized in that: Also includes: Data transceiver equipment, temperature and humidity collection equipment and GPS equipment; the temperature and humidity collection equipment and GPS equipment are both connected to the data transceiver equipment; the data transceiver equipment is connected to a high-precision metering chip.

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