AC / DC integrated charging pile tester

Abstract

The utility model discloses an AC / DC integrated charging pile tester comprising an AC / DC control guide simulation module which is respectively connected with an AC / DC charging pile and an AC / DC load through a first connecting line and is used for adjusting the resistance value of a resistor and simulating a first working condition and a second working condition in charging; the BMS communication simulation module is used for simulating a BMS communication function of the direct-current electric vehicle; the data acquisition and analysis module is used for gating, acquisition, conditioning and transmission of waveform data of each channel of the charging pile; the battery voltage simulation module is used for simulating voltage characteristics, functions and states of batteries of different specifications and outputting direct current; the auxiliary source test load is used for simulating a 12V load of the direct-current electric vehicle; according to the tester, the construction cost of a test system is reduced by sharing a master control, a signal line, an internal power supply loop and the like, and the field test of the alternating current and direct current charging pile is facilitated.

Description

Technical Field

[0001] The utility model belongs to the technical field of charging pile testing equipment, and particularly relates to a charging pile tester integrating AC and DC. Background Art

[0002] Electric vehicles and charging piles conduct millions of interaction activities every day. In these charging activities, a large number of charging failures occur, and even charging accidents may happen. Therefore, it has become a very important task to carry out charging compatibility tests on charging piles and electric vehicles. In the current existing technologies, the tests of AC charging piles and DC charging piles are carried out separately, that is, the test of a DC charging pile and the test of an AC charging pile are two different devices. Generally speaking, a charging station often includes two types of charging piles, namely DC charging piles and AC charging piles. If tests are to be carried out, two different charging pile testers need to be equipped. This results in a large variety of equipment, which is not convenient to carry and work with, and also increases the procurement cost. As the scale of charging station construction is getting larger and larger, the pressure for testing and inspection of AC and DC charging piles is also increasing. In this case, if two types of charging pile testers are still equipped, it will bring various inconveniences in procurement, management, and use.

[0003] For example, the patent application document with the Chinese invention patent application number CN202210761608.0 discloses a test system for an AC charging pile, including: a first interface simulator, a second interface simulator, and a centralized control device. Among them, the first interface simulator is connected to the interface of the target vehicle and is used to respond to a first instruction, where the first instruction is used to adjust the resistance value of a first resistor in the first interface simulator;

[0004] The second interface simulator is connected to the interface of the AC charging pile and is used to respond to a second instruction, where the second instruction is used to adjust the resistance value of a second resistor in the second interface simulator;

[0005] The centralized control device is connected to the target vehicle and the AC charging pile and is used to collect target data according to the first instruction and the second instruction. The target data at least includes the charging current data of the target vehicle and the output current data of the AC charging pile, and at least based on the target data, the AC charging pile is tested.

[0006] The above-mentioned existing technology only supports the test of AC charging piles, that is, there are the above-mentioned technical problems.

[0007] Based on the problems existing in the prior art, the utility model provides a charging pile tester integrating AC and DC. Summary of the Utility Model

[0008] The utility model provides a charging pile tester integrating AC and DC.

[0009] The utility model adopts the following technical solutions:

[0010] A charging pile tester integrating AC and DC includes:

[0011] An AC / DC control and guidance simulation module, the two ends of which are respectively connected to an AC / DC charging pile and an AC / DC load through a first connecting wire, for adjusting the resistance value and simulating the first working condition and the second working condition during charging;

[0012] A BMS communication simulation module, connected to the first connecting wire, for simulating the BMS communication function of a DC electric vehicle;

[0013] A data acquisition and analysis module, connected to the AC control and guidance simulation module, the DC control and guidance simulation module and the first connecting wire, for gating, collecting, conditioning and transmitting the waveform data of each channel of the charging pile;

[0014] A battery voltage simulation module, connected to the first connecting wire, for simulating the battery voltage characteristics, functions and states of different specifications and outputting DC;

[0015] An auxiliary power source test load, connected to the first connecting wire, for simulating the 12V load of a DC electric vehicle;

[0016] A bus and power supply module, to which the auxiliary power source test load, the battery voltage simulation module, the BMS communication simulation module and the AC / DC control and guidance simulation module are all connected.

[0017] Further, the AC / DC control and guidance simulation module includes an AC control and guidance simulation module and a DC control and guidance simulation module. Among them, the AC control and guidance simulation module is used to adjust the resistance value on the CP signal line and simulate the first working condition during charging; the DC control and guidance simulation module is used to adjust the resistance value of the control and guidance resistor and simulate the second working condition during charging.

[0018] Further, the first working condition includes simulating CC grounding, CP grounding, simulating connecting a grounding resistor between CC and PE and between CP and PE, and simulating L1, L2, L3, N, PE, CP, CC faults.

[0019] Further, the second working condition includes simulating the disconnection faults of the DC+, DC-, S+, S-, CC1, CC2, A+ and A- loops, simulating the ground fault of the charging loop, and simulating the insulation resistance drop between DC+ and DC- and PE.

[0020] Further, the charging pile tester further includes an input interface module, and the input interface module is connected to the bus and the power supply module.

[0021] Further, the data acquisition and analysis module is connected to a data acquisition and analysis controller.

[0022] Further, the charging pile tester further includes a chassis, and the AC / DC control and guidance simulation module, the BMS communication simulation module, the data acquisition and analysis module, the battery voltage simulation module, the auxiliary power source test load, the bus and the power supply module are all arranged in the chassis.

[0023] Further, a panel is installed on the chassis, and test terminals, an AC charging gun seat, a DC charging gun seat, a touch screen, and load connection terminals are installed on the panel. Among them, the AC charging gun seat and the DC charging gun seat adopt an interference design with each other, effectively avoiding simultaneous charging of the vehicle simulation device by the AC and DC charging piles through the test device.

[0024] Further, the front stage of the battery voltage simulation module uses uncontrolled rectification, the intermediate stage uses an isolated BOOST boost circuit to boost the bus voltage to 1050VDC, and the rear stage uses a full-bridge chopper and filter circuit. The intermediate stage isolation design effectively improves the safety of the module; the filter circuit effectively filters out the ripple in the rectified output voltage.

[0025] Further, the BMS communication simulation module simulates the sending and receiving of CAN communication messages with different PGNs and judges whether the received messages are compliant.

[0026] Compared with the prior art, the superior effects of the present utility model are as follows:

[0027] The AC / DC integrated charging pile tester of the present utility model, through the coordinated setting of the AC / DC control and guidance simulation module, the BMS communication simulation module and the data acquisition and analysis module, can not only perform electrical performance and interoperability tests on AC charging piles, but also perform electrical performance, interoperability and protocol consistency tests on DC charging piles. By sharing the main control, signal lines, internal power supply circuits, etc., the construction cost of the test system is effectively reduced, which is convenient for on-site testing of AC and DC charging piles. Description of the Drawings

[0028] Figure 1 is a schematic structural diagram of the AC / DC integrated charging pile tester in the embodiment of the present utility model;

[0029] Figure 2 is a schematic principle diagram of the AC / DC control and guidance simulation module in the embodiment of the present utility model;

[0030] Figure 3It is a circuit schematic diagram of the battery voltage simulation module in the embodiment of the present utility model. Detailed implementation manners

[0031] In order to more clearly understand the above-mentioned objects, features and advantages of the present utility model, the present utility model will be further described in detail below with reference to the accompanying drawings and specific implementation manners. It should be noted that, without conflict, the embodiments of the present application and the features in the embodiments can be combined with each other.

[0032] As Figure 1 shown, the AC / DC integrated charging pile tester includes an AC / DC control and guidance simulation module, a BMS communication simulation module, a data acquisition and analysis module, a battery voltage simulation module, an auxiliary power test load, a chassis, an input interface module, a bus and a power module;

[0033] Among them, the AC / DC control and guidance simulation module integrates the AC charging control and guidance circuit of an AC electric vehicle and the control and guidance circuit of a DC electric vehicle, and includes an AC control and guidance simulation module and a DC control and guidance simulation module;

[0034] The input interface module is used to collect and analyze the internal signal status of the AC / DC charging pile;

[0035] As Figure 2 shown, KM1 is the primary disconnector of the AC / DC charging pile, which is used to protect the input end when the bus voltage is abnormal; the AC control and guidance simulation module is built-in with a leakage current simulation unit for AC charging pile testing; the AC control and guidance simulation module is built-in with an insulation fault simulation unit for DC charging pile testing; the AC control and guidance simulation module is built-in with a boost module to simulate the battery voltage of the electric vehicle. Through analog linear adjustment, it can simulate a voltage of 0-1000V, including a voltage acquisition closed-loop feedback circuit; the AC control and guidance simulation module is built-in with a DAC module to linearly adjust the voltage of detection point 1 of CC1 or the voltage of detection point 2 of CP; the AC control and guidance simulation module is built-in with a CAN / 485 conversion unit. When connected to the electric vehicle at the back end, it outputs S+ / S-, and when connected to the load at the back end, it outputs 485 signals to control the back-end load. The AC control and guidance simulation module can steplessly adjust R2 and R3 on the CP signal line. Usually, the default resistors are used: R2 is 1.3kΩ and R3 is 2.74Ω. If it is necessary to test the CP boundary voltage under different resistance values, it is realized by the ADC circuit to simulate the control and guidance voltage limit mode;

[0036] The AC control pilot simulation module can simulate CP grounding and simulate a 120Ω resistor connected between CP and PE; it can simulate faults of L1, L2, L3, N, PE, CP, and CC, specifically including CC disconnection and CP disconnection. Through switches between CC, CP, and PE, disconnection fault simulation is achieved. The switch status is equipped with indicator lights for easy observation. The NBT33008.2 Electric Vehicle Charging Equipment Inspection and Test Specification includes items such as CC open circuit test, CP interruption test, and CP loop boundary voltage value test;

[0037] The DC control pilot simulation module can steplessly adjust the control pilot resistor R4. Under normal circumstances, the default 1k resistor is used. If it is necessary to test the CC1 boundary voltage at different R4 resistance values, it is achieved by simulating the control pilot voltage limit through the ADC circuit;

[0038] The DC control pilot simulation module can simulate open circuit faults of DC+, DC-, S+, S-, CC1, CC2, A+, and A- circuits, can simulate the ground fault of the charging circuit, simulate the insulation resistance drop between DC+ and DC- and PE, and can complete the test requirements of Sections 4.1 and 4.2 of Appendix B in GB / T 18487.1-2015 Electric Vehicle Conductive Charging System - Part 1: General Requirements and GB / T 34657.1-2017 Electric Vehicle Conductive Charging Interoperability Test Specification - Part 1: Power Supply Equipment;

[0039] The DC control pilot simulation module uses a resistor array to simulate the insulation resistance drop between DC+ and PE and between DC- and PE, conducts asymmetric insulation tests between DC+ and PE or between DC- and PE in the charging DC circuit, and symmetric insulation tests between DC+ and PE and between DC- and PE. The resistance range is 1kΩ~600 kΩ, with a step size of 1kΩ, and it can achieve manual switching and automatic switching.

[0040] The BMS communication simulation module is used to simulate the BMS communication function of DC electric vehicles. Using an ARM as the core controller, the analog circuit can achieve the BMS simulation function, simulate the sending and receiving of CAN communication messages with different PGNs, judge whether the received messages are compliant, and conduct DC charging pile communication protocol consistency tests.

[0041] The data acquisition and analysis module is used for the gating, acquisition, conditioning, and transmission functions of the waveform data of each channel of the charging pile; the highest sampling rate of the data acquisition and analysis module is above 40MS / s, and it switches between L1, L2, L3, N, PE, CP, CC and DC+, DC-, S+, S-, CC1, CC2, A+ and A- by switching circuits;

[0042] The data acquisition and analysis module can collect the three-phase input voltage and current of the AC and DC charging piles to be measured, and calculate the voltage, current, power value, power factor, phase, and each harmonic;

[0043] It should be noted that in the embodiment of the present application, the data acquisition and analysis module can meet the requirements of the standby power consumption, efficiency, and power factor tests in the NBT33008.1.2 Electric Vehicle Charging Equipment Inspection and Test Specification;

[0044] The data acquisition and analysis module can run the lower computer control program to execute the test script, communicate with the underlying hardware, and complete specific test items. For test cases, test scripts are edited, and automatic test cases are written in a scripting language. It can be decoupled from the hardware and deployed on multiple hardware platforms. The test cases are called by the upper computer, and the test intermediate data and test results are returned;

[0045] The data acquisition and analysis module is connected to the data acquisition and analysis controller, where the data acquisition and analysis controller uses the ARM core control chip STM32H747.

[0046] As Figure 3 shown, the battery voltage simulation module can simulate the battery voltage characteristics, functions, and states of different specifications, programmably output stable direct current, and meet accurate measurement at the same time;

[0047] The front stage of the battery voltage simulation module uses uncontrolled rectification, the intermediate stage uses an isolated BOOST boost circuit to boost the bus voltage to 1050VDC, and the rear stage uses a full-bridge chopper and filter circuit, which can realize the output of reverse voltage.

[0048] The auxiliary power source test load uses a bidirectional DC / DC circuit with an input voltage of 12V and 10A, and can simulate the 12V load of a DC electric vehicle.

[0049] The charging pile tester further includes a chassis. The AC / DC control and guidance simulation module, the BMS communication simulation module, the data acquisition and analysis module, the battery voltage simulation module, the auxiliary power source test load, the bus, and the power supply module are all arranged in the chassis. Among them, the chassis uses a 5U 19-inch chassis, and test terminals, an AC charging gun socket, a DC charging gun socket, a touch screen, and load connection terminals are installed on the chassis panel. Among them, the AC charging gun socket and the DC charging gun socket adopt an interference design to prevent the simultaneous insertion of the AC charging gun head and the DC charging gun head;

[0050] The bus and power supply module includes a bus and a power supply. The bus is used to transmit information, and the power supply is used to provide electrical energy.

[0051] The present utility model is not limited by the above-mentioned embodiments. What is described in the above-mentioned embodiments and the specification only illustrates the principle of the present utility model. Without departing from the spirit and scope of the present utility model, the present utility model will also have various changes and improvements, and these changes and improvements all fall within the scope of the present utility model claimed. The scope of protection claimed by the present utility model is defined by the appended claims.

Claims

1. An AC / DC integrated charging pile tester, characterized in that: include: An AC / DC control guidance simulation module, wherein two ends of the AC / DC control guidance simulation module are respectively connected to an AC / DC charging pile and an AC / DC load through a first connecting line, and are used to adjust resistance blocking and simulate a first working condition and a second working condition during charging; A BMS communication simulation module, connected to the first connection line, for simulating the communication function of the BMS of the DC electric vehicle; A data acquisition and analysis module, connected to the AC control guidance simulation module, the DC control guidance simulation module and the first connecting line, and used for gating, collecting, conditioning and transmitting waveform data of each channel of the charging pile; A battery voltage simulation module, connected to the first connection line, for simulating voltage characteristics, functions and states of batteries of different specifications, and outputting direct current; An auxiliary source test load, connected to the first connection line, for simulating a 12V load of a DC electric vehicle; The bus and power module, the auxiliary source test load, the battery voltage simulation module, the BMS communication simulation module, and the AC / DC control guidance simulation module are all connected to the bus and power module.

2. The AC / DC integrated charging pile tester according to claim 1, characterized in that: The AC / DC control guidance simulation module includes an AC control guidance simulation module and a DC control guidance simulation module, wherein the AC control guidance simulation module is used to adjust the resistance value of the resistor on the CP signal line and simulate the first operating condition during charging; the DC control guidance simulation module is used to adjust the resistance value of the control guidance resistor and simulate the second operating condition during charging.

3. The AC / DC integrated charging pile tester according to claim 1 or 2, characterized in that: The first working condition includes simulating CC grounding and CP grounding, simulating connecting grounding resistors between CC and PE and between CP and PE, and simulating L1, L2, L3, N, PE, CP, and CC faults.

4. The AC / DC integrated charging pile tester according to claim 3, characterized in that: The second operating condition includes simulating disconnection faults of DC+, DC-, S+, S-, CC1, CC2, A+ and A- circuits, simulating a ground fault of the charging circuit, and simulating a decrease in insulation resistance between DC+, DC- and PE.

5. The AC / DC integrated charging pile tester according to claim 1, characterized in that: The charging pile tester also includes an input interface module, which is connected to the bus and the power module.

6. The AC / DC integrated charging pile tester according to claim 1, characterized in that: The data acquisition and analysis module includes a module connected to a data acquisition and analysis controller.

7. The AC / DC integrated charging pile tester according to claim 1, characterized in that: The charging pile tester also includes a chassis, and the AC / DC control guidance simulation module, the BMS communication simulation module, the data acquisition and analysis module, the battery voltage simulation module, the auxiliary source test load, the bus and the power supply module are all arranged in the chassis.

8. The AC / DC integrated charging pile tester according to claim 7, characterized in that: The chassis is provided with a panel, on which a test terminal, an AC charging gun holder, a DC charging gun holder, a touch screen, and a load connection terminal are installed, wherein the AC charging gun holder and the DC charging gun holder are designed to interfere with each other.

9. The AC / DC integrated charging pile tester according to claim 1, characterized in that: The battery voltage simulation module adopts uncontrolled rectification in the front stage, uses an isolated BOOST boost circuit in the middle stage to increase the bus voltage to 1050VDC, and adopts a full-bridge chopper and filter circuit in the back stage.

10. The AC / DC integrated charging pile tester according to claim 1, characterized in that: The BMS communication simulation module simulates the sending and receiving of CAN communication messages of different PGNs to determine whether the received messages are compliant.

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