With the popularity of electric vehicles and the enhancement of environmental awareness, charging pile as an important part of electric vehicle charging equipment, charging pile industry is developing rapidly, and a large number of applications in the consumer market also create a growing market demand. Therefore, the function, reliability, safety and other requirements of the product have become particularly important, and the use of traditional single-chip microcomputer products can not meet the needs of intelligent control of charging pile, this paper introduces the charging pile application scheme based on the mill STM32MP135 core board in detail.

Figure 1: Charging scheme diagram

STM32MP135 series microprocessor is used to design the intelligent embedded charging pile of electric vehicle, and the intelligent control of complex functions is realized by “command” 8-bit and 16-bit microcontrollers. In the application of intelligent charging pile, STM32MP135 with high cost performance, low power consumption and high reliability has the following advantages:

Run Linux systems and process data and tasks in real time

The charging pile is usually composed of a main control system and several subsystems, which generally include a power supply system, charging gun, electricity meter, display screen, card reading module, and temperature detection system. In charging pile applications, a variety of complex tasks such as data processing, communication and user interface control need to be handled efficiently. The STM32MP135 chip is equipped with a Cortex-A7 processor with a computing frequency of up to 1GHz, which allows customers to easily run Linux systems on the ST chip, providing powerful data processing capabilities.

Figure 2: STM32MP135 processor frame diagram

A variety of peripheral interfaces for easy connection to external devices

In the process of use, the charging pile needs to realize real-time monitoring and control of battery status, charging process and communication status, and exchange data with other systems. The STM32MP135 chip integrates a wealth of peripheral interfaces, including UART, SPI, I2C, USB, CAN FD, double Gigabit Ethernet, etc. It can easily connect various external devices such as sensors, communication modules and displays in the charging pile.

Figure 3: Block diagram of Mill STM32MP135 core board-charging pile scheme

Secure encryption to protect data

As a device involving high voltage power, the safety of charging pile is very important. The STM32MP135 chip provides a wealth of security features, including a hardware encryption engine, secure boot and cure boot, and external access control. These functions can help the charging pile resist various attacks and ensure the safety of users and the integrity of data.

Low power design to reduce energy consumption

The electric vehicle charging pile needs to run for a long time and consumes a lot of power, so the optimization of power consumption is very important. The STM32MP135 chip has a low power consumption feature that automatically adjusts the power level according to demand to extend the working time of the charging pile and reduce energy consumption.

Flexible software support

ST provides a wealth of software support and development tools, including development boards, Linux operating systems and development environments. These tools provide developers with the ability to develop and debug charging pile applications quickly and efficiently.