European standard direct current charging control device and charging method thereof

Abstract

The invention provides a European standard direct current charging control device and a charging method thereof, the device comprises a plurality of European standard direct current controllers, a plurality of charging communication controllers and a plurality of direct current charging guns, and the European standard direct current controllers are connected with one or two charging communication controllers through CAN buses. The charging communication controller is connected with the direct current charging gun through a PLC bus, and the plurality of European standard direct current controllers are mutually connected through network cables. The functional modules are combined flexibly and can be expanded automatically according to specific requirements, and multiple power distribution modes can be selected. The high-voltage part realizes reinforced insulation, the low-voltage part realizes basic insulation, a high-voltage and low-voltage isolation design mode is adopted, the stability of the charging control system is improved, and the anti-interference capability is high. The system has the advantages of low cost, comprehensive functions, wide acquisition range, high precision, stable and reliable performance, strong anti-interference capability, flexible combination mode and the like.

Description

Technical Field

[0001] The present invention relates to the technical field of electric vehicle charging, and in particular to a European standard direct current charging control device and a charging method thereof. Background Art

[0002] At present, countries around the world have introduced policies to ban the sale of traditional fuel vehicles within a limited time. According to a joint report by Ernst & Young and the European Electricity Industry Trade Association, there is a huge gap in electric vehicle charging piles in the European market. With the rapid development of my country's new energy vehicle charging market, new energy technology has been at the forefront of various industries, greatly promoting the export demand for electric vehicle charging piles.

[0003] The vehicle-pile communication method of my country's charging system is CAN communication, which adopts GB / T18487 and GB / T27930 standards. Europe and North America adopt the Combined Charging System (CCS), which implements IEC61851, DINSPEC70121 and other standards. The DC charging control system that currently meets the national standard requirements cannot meet the design requirements of the European standard DC electric vehicle charging system in terms of function and performance. Therefore, it is necessary to design a DC charging control device that meets the European standard requirements. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a European standard DC charging control device and a charging method thereof, which have the advantages of low cost, comprehensive functions, wide acquisition range and high accuracy, stable and reliable performance, strong anti-interference ability, flexible combination mode, etc., and solve the shortcomings of the prior art described in the background technology.

[0005] To solve the above technical problems, an embodiment of the present invention provides the following technical solutions: a European standard DC charging control device, comprising a plurality of European standard DC controllers, a plurality of charging communication controllers, and a plurality of DC charging guns, wherein the European standard DC controller is connected to one or two charging communication controllers via a CAN bus, the charging communication controller is connected to a DC charging gun via a PLC bus, and the plurality of European standard DC controllers are connected to each other via a network cable; The European standard DC controller includes a CPU main control unit and a switch input detection unit electrically connected to the CPU main control unit, an analog quantity acquisition unit, a data storage unit, a network communication unit, a switch output control unit, a serial communication unit, a CAN communication unit, and an LVDs interface; The charging communication controller includes an application processor, a PLC chip, an AFE conversion unit, a CAN communication interface, and a CP communication interface. The application processor is electrically connected to the CAN communication interface and the PLC chip. The PLC chip is electrically connected to the AFE conversion unit. The AFE conversion unit is electrically connected to the CP communication interface. The charging communication controller is communicatively connected with the CAN communication unit of the European standard DC controller via a CAN communication interface.

[0006] Preferably, the CPU main control unit adopts a 32-bit Arm Cortex-A7 microprocessor.

[0007] Preferably, the data storage unit includes a synchronous random access memory, a non-volatile memory, an SD memory card, and a USB interface.

[0008] Preferably, the network communication unit includes an Internet port, a WIFI module and a full-network 4G communication module.

[0009] Preferably, the switch quantity input detection unit and the switch quantity output control unit are designed through an I / O expander.

[0010] Preferably, the analog quantity acquisition unit mainly includes a charging current acquisition module, a battery voltage acquisition module, a charging voltage acquisition module, and a charging gun temperature acquisition module.

[0011] Preferably, the serial communication unit includes a plurality of serial communication circuits, and the CAN communication unit includes a plurality of CAN communication circuits.

[0012] Preferably, the LVDs interface is connected to a touch LCD screen.

[0013] Preferably, the European standard DC controller includes an insulation detection circuit.

[0014] The present invention also provides a charging method of a European standard DC charging control device, comprising the following steps: (1) After the system is powered on and self-tested, it enters the user welcome main interface and the system is in standby mode; (2) After the user has plugged in the charging gun, the charging communication control controller communicates with the European standard DC controller to confirm whether the charging gun is effectively connected. If not, the interface prompts that the charging gun is not connected; if the connection is confirmed to be normal, the European standard DC controller exchanges data with the electric vehicle; (3) The DC charging gun and the electric vehicle have data interaction process. If the data interaction is abnormal, the alarm prompt interface is entered and the charging is ended; if the data interaction is normal, the charging system enters the insulation detection process; (4) The system starts the DC charging gun to output the rated voltage and determines the insulation strength of the DC charging gun. If the insulation detection is abnormal, the system enters the alarm prompt interface and the charging ends. If the insulation detection is normal, the system stops outputting the DC voltage, maintains the discharge switch for 5S, determines that the bus voltage is less than 60V, and enters the pre-charging stage. (5) During the pre-charging phase, the system adjusts the output voltage and detects whether the electrical parameters are normal. If there is an abnormality, the system enters the alarm prompt interface and the charging ends. If the parameters are normal, the system closes the DC output switch and detects whether the DC output switch is closed. If closed successfully, the system enters the charging process. (6) The system determines whether the bus tie switch needs to be closed according to demand. If the bus tie switch needs to be closed, the system starts the idle charging module and outputs voltage and current according to demand to maintain the charging state; (7) During the charging process, the system monitors whether various electrical parameters are normal. If there is an abnormality, the system will enter the alarm prompt interface and the charging will end; if there is no abnormality, the system will continue until the charging is completed; (8) When charging is finished, the charger stops outputting, disconnects the DC output switch, keeps the discharge switch on for 5 seconds, disconnects the bus tie switch, and the interface prompts the user to put the charging gun back into the charging pile; (9) The user puts the charging gun back into the charging pile, charging is completed, and the system returns to the standby interface.

[0015] The beneficial effects of the above technical solution of the present invention are as follows: The functional modules of the present invention are flexible in combination and can be expanded according to specific needs to realize multiple power distribution mode selection. The high-voltage part realizes reinforced insulation, the low-voltage part realizes basic insulation, and the high-low voltage isolation design is adopted to improve the stability of the charging control system and has strong anti-interference ability. The present invention has the advantages of low cost, comprehensive functions, wide acquisition range and high accuracy, stable and reliable performance, strong anti-interference ability, and flexible combination mode. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a configuration diagram of the system of the present invention; Figure 2 This is a functional block diagram of the European standard DC controller of the present invention; Figure 3 This is a functional block diagram of the charging communication controller of the present invention; Figure 4 This is a primary system diagram of the present invention; Figure 5 It is a schematic diagram of the process of the present invention. DETAILED DESCRIPTION

[0017] In order to make the technical problems, technical solutions and advantages to be solved by the present invention more clear, a detailed description will be given below with reference to the accompanying drawings and specific embodiments.

[0018] The European standard DC control device of the present invention is mainly composed of a European standard DC controller and a charging communication controller. When the charging system is a single-gun low-power DC charging system, it is implemented by a design method of a European standard DC charging controller and a charging communication controller; when the charger is a dual-gun charging system, it is implemented by a design method of a European standard DC charging controller and two charging communication controllers; multiple charging devices are networked using a one-master-multiple-slave control mechanism, which can realize a variety of power distribution mode application options, such as the attached Figure 1 shown.

[0019] As attached Figure 2 As shown: The European standard DC charging controller mainly includes: (1) CPU main control unit, (2) data storage unit, (3) network communication unit, (4) switch input detection unit, (5) switch output control unit, (6) analog acquisition unit, (7) serial communication unit, (8) CAN communication unit, and (9) LVDs interface.

[0020] (1) The CPU main control unit is the core of the entire European standard DC controller. It adopts a 32-bit Arm Cortex-A7 microprocessor and has the advantages of low power consumption, high security, and fast operation speed.

[0021] (2) The data storage unit mainly includes synchronous random access memory, non-volatile memory, SD memory card, and USB interface. The synchronous random access memory can improve the operating speed of the entire device. The main function of the non-volatile memory is to save the operating data of the charging system. The SD memory card is connected to the main control unit through the eMMC port to realize the local system software upgrade function. During the operation of the charging system, the main control unit stores the changes of various electrical quantities in real time in the data storage unit to realize the charging system recording function. At the same time, users can use USB flash drives or SD memory cards to export charging data for later data analysis. The storage capacity of the main control unit can be expanded according to project requirements; (3) The network communication unit includes an Ethernet port, a WIFI module and a full-network 4G communication module. The 4G communication module can be connected to the OCPP cloud platform to upload charging information to the OCPP platform in real time. The Ethernet port can be networked with other devices, and the WIFI module is used for system debugging. The network communication unit supports remote upgrades of system software.

[0022] (4) The switch input detection unit is implemented through the I / O expander design and communicates with the main control unit through the I2C interface. It contains several switch input detection circuits and can be expanded according to specific needs.

[0023] (5) The switch output control unit is implemented through the I / O expander design, communicates with the main control unit through the I2C interface, and contains several switch output control loops, which can be expanded according to specific needs.

[0024] (6) The analog quantity acquisition unit mainly includes analog quantity acquisition functions such as charging current, battery voltage, charging voltage (insulation detection), and charging gun temperature. It supports various charging system functional requirements and can be configured according to specific needs.

[0025] The charging current acquisition circuit is designed by combining the limiting value, differential amplification, and low-pass filtering function circuits to realize active low-pass filtering of analog signals and effectively filter out the common high-frequency interference in industrial control systems.

[0026] The battery voltage acquisition circuit increases the input level by inputting a reference voltage, detects the reference voltage and the input voltage value at the same time, and realizes bidirectional acquisition of DC voltage without reducing the acquisition accuracy through a software filtering algorithm.

[0027] The charging voltage acquisition (insulation detection) circuit uses a high-precision ADC chip for measurement to achieve bidirectional voltage acquisition. It communicates with the main control unit via the SPI bus, and has the advantages of fast response speed and high precision. While calculating the charging voltage, the voltage between the positive and negative poles of the DC voltage and the earth is calculated separately, providing a data basis for insulation detection, with obvious comprehensive cost advantages.

[0028] The high voltage analog quantity acquisition circuit is reinforced with the main control unit and each high voltage analog quantity acquisition circuit. The analog quantity acquisition unit has the advantages of wide range, high precision, strong real-time performance, safety and reliability.

[0029] (7) The serial communication unit contains several serial communication circuits, which are photoelectrically isolated from the main control unit and meet the basic insulation requirements. It can communicate with peripheral devices such as electricity meters, card readers, and serial display screens.

[0030] (8) The CAN communication unit includes several CAN communication circuits. The basic insulation requirements are met between the CAN communication circuits and between the CAN communication circuits and the main control unit. The CAN communication circuit can communicate with the charging module and the charging communication controller.

[0031] (9) LVDS interface connects to touch LCD screen. System parameters can be set through the system interface. The LCD displays the status of each switch quantity, charging voltage, charging current, system temperature and other analog information in real time, human-computer interaction, fault recording processing, and intelligent charging control.

[0032] As attached Figure 3 As shown: The charging communication controller mainly includes: (10) application processor unit, (11) PCL chip, (12) AFE conversion unit, (13) CAN communication interface, and (14) CP communication interface.

[0033] The charging communication controller and the main control unit use CAN bus communication. This solution has strong anti-interference ability. Convert CAN communication to PLC communication to realize the interconnection between the DC charging control system and the electric vehicle.

[0034] like Figure 5 As shown, the European standard DC charging control device of the present invention, the specific implementation scheme includes the following steps: (1) The system completes the power-on self-test and enters the user welcome main interface. The system is in standby mode; (2) After the user has plugged in the charging gun, the charging communication control controller communicates with the European standard DC controller to confirm whether the charging gun is effectively connected. If it is not effectively connected, the interface prompts that the charging gun is not connected. If the connection is confirmed to be normal, the European standard DC controller exchanges data with the electric vehicle; (3) The charger and the electric vehicle have data interaction process. If the data interaction is abnormal, the alarm prompt interface is entered and charging ends. If the data interaction is normal, the charging system enters the insulation detection process; (4) The system starts the charger to output rated voltage and determines the insulation strength of the charger at the same time. If the insulation detection is abnormal, the system enters the alarm prompt interface and charging ends. If the insulation detection is normal, the system stops outputting DC voltage, maintains the discharge switch for 5S, determines that the bus voltage is less than 60V, and enters the pre-charging stage; (5) During the pre-charging phase, the system adjusts the output voltage and detects whether the various electrical parameters are normal. If there is an abnormality, the system enters the alarm prompt interface and the charging ends. If the parameters are normal, the system closes the DC output switch and detects whether the DC output switch is closed. If closed successfully, the system enters the charging process; (6) The system determines whether the bus tie switch needs to be closed according to demand. If the bus tie switch needs to be closed, the system starts the idle charging module and outputs voltage and current according to demand to maintain the charging state; (7) During the charging process, the system monitors whether the various electrical parameters are normal. If there is an abnormality, the system will enter the alarm prompt interface and the charging will end. If there is no abnormality, the system will continue until the charging is completed; (8) When charging is finished, the charger stops outputting, disconnects the DC output switch, keeps the discharge switch on for 5 seconds, disconnects the bus tie switch, and the interface prompts the user to put the charging gun back into the charging pile; (9) The user puts the charging gun back into the charging pile, charging is completed, and the system returns to the standby interface.

[0035] The functional modules of the present invention are flexible in combination and can be expanded according to specific needs to realize multiple power distribution mode selection. The high-voltage part realizes reinforced insulation, the low-voltage part realizes basic insulation, and the high-low voltage isolation design is adopted to improve the stability of the charging control system and has strong anti-interference ability. The present invention has the advantages of low cost, comprehensive functions, wide acquisition range and high accuracy, stable and reliable performance, strong anti-interference ability, and flexible combination mode.

[0036] The above is a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A European standard DC charging control device, characterized in that: It includes multiple European standard DC controllers, multiple charging communication controllers, and multiple DC charging guns. The European standard DC controller is connected to one or two charging communication controllers via a CAN bus. The charging communication controller is connected to a DC charging gun via a PLC bus. The multiple European standard DC controllers are connected to each other via network cables. The European standard DC controller includes a CPU main control unit and a switch input detection unit electrically connected to the CPU main control unit, an analog quantity acquisition unit, a data storage unit, a network communication unit, a switch output control unit, a serial communication unit, a CAN communication unit, and an LVDs interface; The charging communication controller includes an application processor, a PLC chip, an AFE conversion unit, a CAN communication interface, and a CP communication interface. The application processor is electrically connected to the CAN communication interface and the PLC chip. The PLC chip is electrically connected to the AFE conversion unit. The AFE conversion unit is electrically connected to the CP communication interface. The charging communication controller is communicatively connected with the CAN communication unit of the European standard DC controller via a CAN communication interface.

2. The European standard DC charging control device according to claim 1, characterized in that: The CPU main control unit adopts a 32-bit Arm Cortex-A7 microprocessor.

3. The European standard DC charging control device according to claim 1, characterized in that: The data storage unit includes a synchronous random access memory, a non-volatile memory, an SD memory card, and a USB interface.

4. The European standard DC charging control device according to claim 1, characterized in that: The network communication unit includes an Internet port, a WIFI module and a full-network 4G communication module.

5. The European standard DC charging control device according to claim 1, characterized in that: The switch quantity input detection unit and the switch quantity output control unit are designed through an I / O expander.

6. The European standard DC charging control device according to claim 1, characterized in that: The analog quantity acquisition unit mainly includes a charging current acquisition module, a battery voltage acquisition module, a charging voltage acquisition module, and a charging gun temperature acquisition module.

7. The European standard DC charging control device according to claim 1, characterized in that: The serial communication unit includes a plurality of serial communication circuits, and the CAN communication unit includes a plurality of CAN communication circuits.

8. The European standard DC charging control device according to claim 1, characterized in that: The LVDs interface is connected to a touch liquid crystal screen.

9. The European standard DC charging control device according to claim 1, characterized in that: The European standard DC controller comprises an insulation detection circuit.

10. A charging method for a European standard DC charging control device, characterized in that: The following steps are involved: (1) After the system is powered on and self-tested, it enters the user welcome main interface and the system is in standby mode; (2) After the user has plugged in the charging gun, the charging communication control controller communicates with the European standard DC controller to confirm whether the charging gun is effectively connected. If not, the interface prompts that the charging gun is not connected; If the connection is confirmed to be normal, the European standard DC controller will exchange data with the electric vehicle; (3) The DC charging gun and the electric vehicle have data interaction process. If the data interaction is abnormal, the alarm prompt interface is entered and the charging is ended; if the data interaction is normal, the charging system enters the insulation detection process; (4) The system starts the DC charging gun to output the rated voltage and determines the insulation strength of the DC charging gun. If the insulation detection is abnormal, the system enters the alarm prompt interface and the charging ends. If the insulation detection is normal, the system stops outputting the DC voltage, maintains the discharge switch for 5S, determines that the bus voltage is less than 60V, and enters the pre-charging stage. (5) During the pre-charging phase, the system adjusts the output voltage and detects whether the various electrical parameters are normal. If there is an abnormality, the system enters the alarm prompt interface and the charging ends. If the parameters are normal, the system closes the DC output switch and detects whether the DC output switch is closed. If closed successfully, the system enters the charging process. (6) The system determines whether the bus tie switch needs to be closed according to demand. If the bus tie switch needs to be closed, the system starts the idle charging module and outputs voltage and current according to demand to maintain the charging state; (7) During the charging process, the system monitors whether various electrical parameters are normal. If there is an abnormality, the system will enter the alarm prompt interface and the charging will end; if there is no abnormality, the system will continue until the charging is completed; (8) When charging is finished, the charger stops outputting, disconnects the DC output switch, keeps the discharge switch on for 5 seconds, disconnects the bus tie switch, and the interface prompts the user to put the charging gun back into the charging pile; (9) The user puts the charging gun back into the charging pile, charging is completed, and the system returns to the standby interface.

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