What is the intelligent control system of the control motherboard for car communication charging stations?

The intelligent control system of the control motherboard for automotive AC charging stations is a complex and precise system, which mainly includes the following key parts:

1.Charging control and regulation module

• Intelligent power regulation: By communicating with the vehicle's battery management system (BMS), it obtains the status information of the vehicle's battery, such as remaining power, battery temperature, and the maximum charging current and voltage allowed by the battery. Based on this information, the control motherboard can adjust the output charging current and voltage in real time, achieving intelligent power regulation. For example, during low battery levels, the motherboard will output a larger current in constant current mode for fast charging based on the BMS feedback allowing for a larger charging current; When the battery level reaches a certain level, switch to constant voltage charging mode to make the charging process safer and more efficient, avoiding damage to the battery caused by overcharging.

• Charging mode control: Supports multiple charging modes, such as timed charging, quantitative charging, and automatic full charging. Users can set the charging mode through the charging station interface or mobile app. In the timed charging mode, the clock module and control program inside the motherboard work together to start charging at the time set by the user, which is very practical for users who use low valley electricity prices for charging. The quantitative charging mode is based on the user's set charging capacity, and automatically stops charging when the set capacity is reached. In automatic full charging mode, the motherboard will automatically charge the battery based on the feedback information from the BMS.

2.communication module

• Internal communication: Within the charging station, the control motherboard communicates with various functional modules (such as power module, metering module, display module, etc.) through CAN bus (Controller Area Network) or other internal communication protocols. This communication method ensures efficient collaboration between various modules, achieving real-time sharing and interaction of data. For example, the control motherboard sends power adjustment commands to the power module through the CAN bus, while receiving feedback on the actual output power and other information from the power module.

• External communication: It has multiple external communication methods, such as Ethernet, Wi Fi, 4G/5G, etc., used for communication with vehicle BMS, backend management system, and user mobile APP. When communicating with the vehicle BMS, the motherboard can obtain detailed information about the vehicle battery and send charging parameters to the vehicle. Communicating with the backend management system, it is possible to upload the operating status of the charging station (such as charging, standby, fault, etc.), charging data (such as charging power, charging time, billing amount, etc.), and receive management instructions from the backend (such as remote start/stop charging, adjusting billing strategies, etc.). By communicating with the user's mobile app, they can view the charging progress, control the charging process, and query historical charging records in real-time on their phone.

3.Security monitoring and protection module

• Electrical safety monitoring: Real time monitoring of electrical parameters during the charging process, including charging current, voltage, and leakage. Once overcurrent (such as a short circuit in the charging line causing excessive current), overvoltage (abnormal increase in grid voltage fluctuations), undervoltage (low voltage caused by grid faults) or leakage is detected, the control motherboard will immediately take protective measures, such as cutting off the charging circuit, to avoid damage to the vehicle battery and charging station equipment, while ensuring personnel safety. These safety protection functions are achieved through high-precision current sensors, voltage sensors, and leakage detection circuits.

• Battery safety monitoring: closely cooperate with the vehicle BMS to monitor the status of the battery. If the BMS feedbacks that the battery temperature is too high, the motherboard will adjust the charging parameters, such as reducing the charging current or pausing charging, to prevent the battery from overheating and causing safety accidents. At the same time, the motherboard also prevents overcharging and overdischarging of the battery, ensuring that the battery is within a safe charging range through reasonable charging control algorithms and real-time communication with the BMS.

4.Measurement and billing module

• Electricity metering: Using high-precision electricity metering chips to measure the amount of charged electricity. These chips calculate the charging amount by real-time sampling and integration of the current and voltage during the charging process. In order to ensure measurement accuracy, the control board will also adopt some calibration and compensation algorithms, considering the impact of environmental factors such as temperature and humidity on the measurement results. For example, by regularly calibrating the measuring chip, it can maintain high measurement accuracy in different environments.

• Billing management: Calculate charging fees based on the measured charging amount and preset billing rules. The billing rules can be simple electricity based billing, time-based billing, or more complex tiered billing methods. The control motherboard can display the billing results on the charging pile interface, and supports multiple payment methods, such as swiping card payment, scanning code payment (WeChat, Alipay, etc.), and sensorless payment. During the payment process, the motherboard communicates with the payment platform through a communication module to complete the security verification and fee settlement of the payment process.

5.Status monitoring and display module

• Charging station status monitoring: Real time monitoring of the operating status of the charging station itself, including the working temperature of the control motherboard, the working status of various functional modules, and the connection status of the charging gun. By integrating temperature sensors, status monitoring circuits, etc. on the motherboard, abnormal situations of charging stations can be detected in a timely manner. For example, when the temperature of the control motherboard is too high or a certain functional module malfunctions, it can promptly alarm and take corresponding measures.

• Information display and feedback: Display the operating status information of the charging station (such as charging progress, expected full charging time, fault information, etc.) through the display screen of the charging station or the user's mobile APP. Users can intuitively understand the charging situation, and this information also helps operation and maintenance personnel to remotely manage and troubleshoot charging stations. For example, when a fault occurs during the charging process, the control motherboard will send the fault code to the display screen or mobile app, making it convenient for maintenance personnel to quickly locate the problem.