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Due to technological improvement, low-carbon emission requirements and government policy incentives, electric vehicles (EVS) are a rapidly growing part of the automotive industry. At present, the electric vehicle industry is undergoing a technological revolution to improve the vehicle range through charging infrastructure. Electric vehicle manufacturers and charging service enterprises are investing heavily in the infrastructure of charging stations to support long-range electric vehicles and improve the charging experience of electric vehicle drivers. Government incentives and automobile manufacturers' initiatives in charging infrastructure construction are key factors to promote the growth of the global electric vehicle charging station market. According to the careful market research report, it is estimated that by 2027, the market scale will reach about US $30 billion, and the compound annual growth rate in 2019 will be 36%. The segment market of level 3 DC charging stations accounts for the largest share of the entire EV charging station market, and the Asia Pacific region will account for nearly 50% of the market share in the forecast period. A large part of this market segment is mainly due to the increasing demand for charging infrastructure in convenient urban commercial places. Expensive commercial real estate encourages investors and developers to reduce the volume of chargers and improve the charging capacity. This leads to an increasing demand for high-density charger pile modules. In order to achieve high-density design, the power converter needs to work at a higher switching frequency and the same or better efficiency. At present, the latest design and mass production of charge pile modules almost all use 650V Si MOSFET to obtain good power density and efficiency. For designs with power exceeding 6kW, three-phase input becomes necessary. Since the intermediate bus voltage exceeds the rated requirements of 650V devices, three-level topology or serial converter is the only choice for design. Fig. 1 and Fig. 2 are two commonly used isolated charger pile topologies.

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