The power management system includes components such as transformers, rectifiers and voltage regulators to dynamically adjust the output voltage based on charging protocols and real-time communication feedback. In order to improve the reliability and security of communication, communication interface modules usually integrate transceiver chip, isolation chip and DC/DC isolation source. This design helps withstand harsh electromagnetic environments and protects communication interfaces from transient voltages and ESD damage. The power management module must be able to adapt to the harsh operating temperature, which ranges from -20 ° C to +50 ° C, and the temperature in some parts where the heat dissipation is poor may reach 75 ° C or higher. The communication interface module is directly related to the charging function of the DC charging pile, so the failure rate of the communication interface module is required to be very low, and can be timely and convenient maintenance. The metering chip in the power management system needs to have a high metering accuracy to ensure the accurate measurement of power consumption, which is generally a level 1 accuracy.