Intelligent central control system of direct current charging pile

Abstract

The invention discloses an intelligent central control system of a direct current charging pile, which relates to the technical field of electric vehicle charging facilities and comprises a main control unit, a communication interface, a user interaction module and a safety management module. The main control unit is used for performing core control and data processing on the whole central control system; the communication interface is used for realizing data transmission and communication interaction between the system and external equipment; the user interaction module is used for providing an interaction interface and an operation function between a user and the charging pile; the safety management module is used for monitoring and guaranteeing the safety condition in the operation process of the charging pile. According to the intelligent central control system of the direct current charging pile, accurate monitoring and intelligent scheduling can be carried out on the charging process, the charging parameters are dynamically adjusted by analyzing the state of the battery of the electric vehicle, the charging requirement and the load condition of the power grid in real time, and the optimal charging strategy is adopted.

Description

Technical Field

[0001] The present invention relates to the technical field of electric vehicle charging facilities, and particularly to an intelligent central control system for a DC charging pile. Background Art

[0002] With the emphasis on environmental protection and sustainable development, electric vehicles, as a means of transportation powered by clean energy, are gradually becoming the development trend of the automotive industry. The widespread popularization of electric vehicles is inseparable from a complete charging infrastructure. Among them, DC charging piles have become an important part of the electric vehicle charging network because they can quickly charge electric vehicles in a short time and meet the emergency charging needs of users.

[0003] Traditional DC charging piles have problems such as low charging efficiency, poor communication protocol compatibility, insufficient expansion ability, a single user interface, lack of multi-language support and intelligent feedback, an imperfect safety protection mechanism, and are prone to safety hazards such as overcurrent and overheating. Data management relies on local storage and lacks cloud collaboration and remote maintenance functions.

[0004] Therefore, in view of this, research and improvement are carried out on the existing structure and deficiencies, and an intelligent central control system for a DC charging pile is proposed. Summary of the Invention

[0005] The purpose of the present invention is to provide an intelligent central control system for a DC charging pile to solve the problems raised in the above background art.

[0006] To achieve the above purpose, the present invention provides the following technical solution: An intelligent central control system for a DC charging pile includes a main control unit, a communication interface, a user interaction module, and a safety management module; the main control unit is respectively connected to the communication interface, the user interaction module, and the safety management module; the main control unit is used for core control and data processing of the entire central control system; the communication interface is used for data transmission and communication interaction between the system and external devices; the user interaction module is used to provide an interaction interface and operation functions between the user and the charging pile; the safety management module is used to monitor and ensure the safety status during the operation of the charging pile. The communication interface is also connected to a charging monitoring and scheduling module for real-time analysis of the state of the electric vehicle battery, charging requirements, and the load situation of the power grid, and dynamically adjusting the charging parameters.

[0007] Furthermore, it further includes a data management module. The main control unit is connected to the data management module. The data management module is used for storing, managing, and analyzing data related to the operation of the charging pile, and the data management module is connected to the PCB control board to realize relevant data interaction for hardware control of the charging pile.

[0008] Further, it also includes a network connection module. The communication interface is connected to the network connection module, and the network connection module is used to establish a connection between the central control system and the external network, supporting the remote communication and data transmission functions of the system, including but not limited to data interaction with cloud servers, electric vehicles, and other charging pile devices.

[0009] Further, the user interaction module supports multi-language display and intelligent feedback functions, and can provide users with information such as charging status, fee settlement, and operation guidance through graphical interfaces, voice prompts, etc. according to user operations and system status.

[0010] Further, the safety management module is integrated with various monitoring sensors such as current, voltage, and temperature. When abnormal situations such as overcurrent, overheat, and leakage are detected, it can automatically cut off the circuit and issue an alarm.

[0011] Further, the data management module supports local data storage and cloud data synchronization, can upload the operation data of the charging pile to the cloud server for centralized management and analysis, and also supports remote data query and download.

[0012] Further, the network connection module supports multiple communication protocols, including but not limited to Ethernet, Wi-Fi, 4G / 5G, etc., to achieve stable communication connections between the central control system and different external devices.

[0013] Further, the power management circuit is connected to the bidirectional DC-DC converter and the input voltage adaptation module.

[0014] Further, the bidirectional DC-DC converter is used to achieve bidirectional conversion of direct current, and it is connected to the SiC MOSFET device.

[0015] Further, the input voltage adaptation module is used to adapt to different input voltages, automatically adjust according to the change of the input voltage, and its output terminal can be connected to devices with different battery specifications.

[0016] The present invention provides an intelligent central control system for a DC charging pile, which has the following beneficial effects: The present invention can accurately monitor and intelligently schedule the charging process. By real-time analyzing the status of the electric vehicle battery, charging demand, and the load situation of the power grid, it dynamically adjusts the charging parameters and adopts the optimal charging strategy. For example, when the battery power is low, it uses high-current fast charging, and automatically reduces the current when approaching full charge to protect the battery, avoiding the inefficient charging problem in the fixed charging mode of traditional charging piles, greatly shortening the charging time, and improving the overall charging efficiency.

[0017] Integrates multiple mainstream charging communication protocols, has strong protocol adaptability, and the central control system automatically identifies and establishes a stable communication connection with them to achieve seamless docking, effectively solving the problem of poor compatibility of traditional charging pile communication protocols, expanding the applicable range of charging piles, and improving the user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is the system topology diagram of an intelligent central control system for a DC charging pile of the present invention;

[0019] Figure 2 It is the circuit schematic diagram of the PCB control board of an intelligent central control system for a DC charging pile of the present invention;

[0020] Figure 3 It is the working flow chart of the power management module of an intelligent central control system for a DC charging pile of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0021] The following further describes in detail the embodiments of the present invention in conjunction with the drawings and embodiments. The following embodiments are used to illustrate the present invention, but cannot be used to limit the scope of the present invention.

[0022] As Figures 1 to 3 shown, an intelligent central control system for a DC charging pile includes a main control unit, a communication interface, a user interaction module, and a safety management module; the main control unit is used for core control and data processing of the entire central control system; the communication interface is used for data transmission and communication interaction between the system and external devices; the user interaction module is used to provide an interaction interface and operation functions between the user and the charging pile; the safety management module is used to monitor and ensure the safety status during the operation of the charging pile.

[0023] Specifically, the main control unit is equipped with an ARM Cortex-A72 multi-core processor with a main frequency ≥ 2.0 GHz, and the real-time operating system (RTOS) supports multi-threaded task scheduling. It integrates a CAN bus controller and supports the ISO 15118 charging communication protocol; the communication interface adopts a three-mode communication design: wired (RS-485 / ethernet) + wireless (Wi-Fi 6 / 5G), and establishes an OPC UA protocol stack to achieve device interconnection and interoperability

[0024] The main control unit is connected to a data management module, which is used to store, manage, and analyze data related to the operation of the charging pile, and the data management module is connected to the PCB control board to achieve relevant data interaction for the hardware control of the charging pile.

[0025] Specifically, the power management circuit uses SiC MOSFET devices to build a bidirectional DC-DC converter (efficiency ≥ 98%), with an input voltage range of 200 - 1000 VDC, which is compatible with various electric vehicle battery specifications.

[0026] The communication interface is connected to the network connection module, which is used to establish the connection between the central control system and the external network, supporting the remote communication and data transmission functions of the system, including but not limited to data interaction with cloud servers, electric vehicles, and other charging pile devices.

[0027] Specifically, the o signal processing circuit uses 16-bit high-precision ADC sampling, supports a current detection accuracy of ±0.5%, and has an opto-isolation design with a common-mode rejection ability > 50 kV / μs.

[0028] The user interaction module supports multi-language display and intelligent feedback functions, and can provide users with information such as charging status, fee settlement, and operation guidance through graphical interfaces, voice prompts, etc. according to user operations and system status.

[0029] Specifically, the user interaction module uses a 7-inch IPS capacitive touch screen (resolution 1280×720), and voice interaction supports Chinese / English / French language recognition (based on the RNN neural network algorithm).

[0030] The safety management module integrates various monitoring sensors such as current, voltage, and temperature. When abnormal situations such as overcurrent, overheating, and leakage are detected, it can automatically cut off the circuit and issue an alarm.

[0031] Specifically, the safety management module adopts a three-level protection mechanism:

[0032] Hardware level: IGBT drive protection circuit (response time < 2 μs).

[0033] Software level: PID algorithm dynamically adjusts the output power.

[0034] Mechanical level: Magnetic latching relay for emergency power off.

[0035] The data management module supports local data storage and cloud data synchronization, can upload the charging pile operation data to the cloud server for centralized management and analysis, and also supports remote data query and download.

[0036] Specifically, the data management module adopts an edge computing architecture: local storage (eMMC 128 GB) + cloud synchronization (AES-256 encryption), and a charging behavior analysis model (real-time processing of data streams based on the Spark framework).

[0037] The network connection module supports multiple communication protocols, including but not limited to Ethernet, Wi-Fi, 4G / 5G, etc., to achieve a stable communication connection between the central control system and different external devices.

[0038] The power management circuit is connected to a bidirectional DC-DC converter and an input voltage adaptation module.

[0039] The bidirectional DC-DC converter is used to achieve bidirectional conversion of direct current and is connected to SiC MOSFET devices.

[0040] Specifically, the network connection module adopts a dual-SIM card redundancy design and supports automatic operator switching.

[0041] The differential upgrade technology realizes firmware security updates; the input voltage adaptation module is used to adapt to different input voltages, automatically adjust according to the change of the input voltage, and its output terminal can be connected to devices with different battery specifications.

[0042] In summary, the charging process control flow is as follows: The user brings a device supporting NFC function close to the NFC sensing area of the charging pile, or uses the mobile phone to scan the QR code on the charging pile. At this time, the user device establishes a communication connection with the charging pile and sends a charging start request signal to the central control system. This request signal contains relevant data such as user identity information and vehicle information. After receiving the charging start request signal, the central control system establishes a communication link with the vehicle's battery management system (BMS). Through a specific communication handshake process, the central control system sends a series of protocol verification instructions to the vehicle BMS, and the BMS returns corresponding response data according to the instructions. The central control system analyzes and compares these response data to verify whether the vehicle BMS communication protocol is compatible and matched with the charging pile's communication protocol. If the verification passes, proceed to the next step; if the verification fails, the central control system sends an error prompt message to the user device, informing the user that the reason for the failure to start charging is the incompatible communication protocol. After the communication protocol verification passes, the PCB control board of the charging pile starts to work. The PCB control board first injects a small current into the charging circuit, and then measures the insulation resistance value in the circuit through a high-precision resistance measurement circuit. When the detected insulation resistance value is greater than 500Ω, it indicates that the insulation performance of the charging circuit is good and meets the safe charging conditions, and the next step can be entered; if the insulation resistance value is less than or equal to 500Ω, the PCB control board immediately cuts off the charging circuit and sends an insulation fault alarm signal to the central control system, and the central control system then conveys this fault information to the user device. During the charging process, first enter the constant current charging (CC) stage. The PCB control board dynamically adjusts the charging current according to the battery status information fed back by the vehicle BMS, such as battery voltage and remaining battery capacity, to keep it at a constant set value to quickly charge the battery. When the battery voltage rises close to the rated charging voltage of the battery, the charging process automatically switches to the constant voltage charging (CV) stage. In the CV stage, the PCB control board adjusts the charging voltage to keep it constant, and at the same time, as the battery charge gradually saturates, the charging current gradually decreases. By this way of dynamically adjusting the charging curve, it can not only ensure that the battery is charged quickly and efficiently, but also prevent overcharging from damaging the battery. During the charging process, the PCB control board monitors the charging environment temperature and the battery temperature in real time. When the detected temperature is greater than 85℃, a hierarchical power reduction strategy is triggered. First, the PCB control board reduces the charging power by a certain proportion, such as 20%, and continuously monitors the temperature change. If the temperature gradually decreases and stabilizes within the safe range after reducing the power, continue charging at the current reduced power; if the temperature still continues to rise, further reduce the charging power until the temperature returns to the safe range or stop charging, and send a temperature anomaly alarm message to the central control system, and the central control system conveys this information to the user device and relevant operation and maintenance personnel.

[0043] The remote maintenance process is as follows: After the device manufacturer completes the production and testing of the firmware upgrade package on the cloud server, the firmware upgrade package is pushed to the target device through network communication. The cloud server first determines the list of devices to be upgraded, and then establishes a secure network connection for each device. Through this connection, the firmware upgrade package is gradually transmitted to the device in the form of data packets. During the transmission process, a reliable transmission protocol is adopted to ensure the integrity and accuracy of the data, and at the same time, the transmission progress is monitored and fed back in real time. After the device receives the firmware upgrade package, it does not immediately perform the upgrade operation. The device's secure boot mechanism is first triggered, and the secure boot module reads the pre-stored digital signature verification key from the device's secure storage area. Then, the digital signature in the received firmware upgrade package is verified. The secure boot module uses a specific encryption algorithm and the verification key to decrypt and compare the digital signature. If the digital signature verification passes, it indicates that the firmware upgrade package has not been tampered with and the source is reliable, and the next upgrade process can be entered; if the digital signature verification fails, the device will reject the upgrade operation and send an error report to the cloud server, informing the information that the upgrade package signature verification fails. There are two independent storage areas inside the device, which are respectively used to store the currently running firmware version (main storage area) and the firmware version to be upgraded (backup storage area). At the beginning of the upgrade, the new firmware upgrade package is first written into the backup storage area. During the writing process, data integrity verification methods such as checksum are adopted to ensure that the written firmware data is accurate. After the firmware in the backup storage area is written, the device performs a pre-boot test and tries to boot the device from the backup storage area. If the pre-boot test is successful, it indicates that the new firmware can run normally, and the device switches the main storage area to the backup storage area, that is, the firmware upgrade is officially completed; if the pre-boot test fails, the device still boots from the main storage area, keeps the original firmware version running normally, and sends an upgrade failure report to the cloud server. At the same time, the device will automatically clear the incorrect firmware data written in the backup storage area and wait for the next correct firmware upgrade package to be pushed. Through this way of alternating updates in the two storage areas, it is ensured that even if an unexpected situation occurs during the firmware upgrade process, the device can quickly roll back to the previous normal firmware version to ensure the stable operation of the device.

[0044] The embodiments of the present invention are given for purposes of illustration and description, and are not exhaustive or limit the invention to the disclosed form. Many modifications and variations are obvious to those of ordinary skill in the art. The embodiments are chosen and described in order to better explain the principles of the invention and its practical application, and to enable those of ordinary skill in the art to understand the invention and design various embodiments with various modifications suitable for specific purposes.

Claims

1. An intelligent central control system for a DC charging pile, characterized in that: It includes a main control unit, a communication interface, a user interaction module, and a security management module; The main control unit is connected to the communication interface, the user interaction module, and the security management module respectively; The main control unit is used to perform core control and data processing on the entire central control system; The communication interface is used to realize data transmission and communication interaction between the system and external devices; the user interaction module is used to provide an interactive interface and operation functions between the user and the charging pile; the safety management module is used to monitor and ensure the safety status of the charging pile during operation. The communication interface is also connected to a charging monitoring and scheduling module, which is used to analyze the status of the electric vehicle battery, charging demand and load conditions of the power grid in real time, and dynamically adjust the charging parameters.

2. The intelligent central control system of a DC charging pile according to claim 1, characterized in that: It also includes a data management module. The main control unit is connected to the data management module. The data management module is used to store, manage and analyze data related to the operation of the charging pile. The data management module is connected to the PCB control board of the charging pile to realize the relevant data interaction of the hardware control of the charging pile.

3. The intelligent central control system of a DC charging pile according to claim 2 is characterized in that: It also includes a network connection module, the communication interface is connected to the network connection module, and the network connection module is used to establish a connection between the central control system and the external network, supporting the system's remote communication and data transmission functions, including but not limited to data interaction with cloud servers, electric vehicles and other charging pile equipment.

4. The intelligent central control system of a DC charging pile according to claim 3 is characterized in that: The user interaction module supports multi-language display and intelligent feedback functions, and can provide users with information such as charging status, fee settlement, and operation instructions through a graphical interface, voice prompts, etc. according to user operations and system status.

5. The intelligent central control system of a DC charging pile according to claim 4, characterized in that: The safety management module integrates multiple monitoring sensors such as current, voltage, temperature, etc. When abnormal conditions such as overcurrent, overheating, leakage, etc. are detected, it can automatically cut off the circuit and sound an alarm.

6. The intelligent central control system of a DC charging pile according to claim 5, characterized in that: The data management module supports local data storage and cloud data synchronization, can upload charging pile operation data to the cloud server for centralized management and analysis, and also supports remote data query and download.

7. The intelligent central control system of a DC charging pile according to claim 6, characterized in that: The network connection module supports multiple communication protocols, including but not limited to Ethernet, Wi-Fi, 4G / 5G, etc., to achieve stable communication connection between the central control system and different external devices.

8. The intelligent central control system of a DC charging pile according to claim 7, characterized in that: The power management circuit is connected to the bidirectional DC-DC converter and the input voltage adapter module.

9. The intelligent central control system of a DC charging pile according to claim 8, characterized in that: The bidirectional DC-DC converter is used to realize bidirectional conversion of direct current, which is connected to the SiC MOSFET device.

10. The intelligent central control system of a DC charging pile according to claim 8, characterized in that: The input voltage adapter module is used to adapt to different input voltages and automatically adjust according to changes in the input voltage. Its output end can be connected to devices with different battery specifications.

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