With the development of new energy electric vehicles, people's demand for efficient and safe new energy charging piles is increasing. The charging speed of AC charging piles is relatively slow. Compared with AC charging piles, DC fast charging piles have the characteristics of fast charging speed and high utilization rate, and are highly recognized by new energy vehicle owners. They are also the type of construction preferred by major charging operators. The charging module is the core of the charging device. The high-power DC charging pile design will use AC-DC and DC-DC converters to convert the incoming three-phase AC power to the DC voltage 250V-750V required for electric vehicles, building 15 kW to 30 kW sub-power modules.