Abstract: This paper introduces the primary functions and main topological structure of direct current to direct current (DC-DC) converter for electric vehicles. Addressing the difficulty of achieving zero voltage switch (ZVS) in the lag arm of phase-shifted full-bridge DC-DC converter, a solution involving the addition of a boost circuit is proposed and subjected to necessary simulation analysis and calculations. Results demonstrate that the circuit achieves ZVS across a wide input voltage range, exhibits low ripple, and operates with high efficiency. It meets the vehicle's low-voltage power supply requirements while reducing energy consumption and enhancing product performance.

Key words: DC-DC converter; phase-shifted full bridge; boost circuit; zero voltage switch

摘要： 文章对电动汽车直流-直流（DC-DC）变换器的主要功能和主要拓扑结构进行了介绍， 针对移相全桥 DC-DC 变换器滞后臂较难实现零电压开关（ZVS）的情况，提出了一种增加升 压电路的方案并对此方案进行了必要的仿真分析。仿真结果显示，该设计方案可使移相全桥 拓扑在较宽输入电压范围内实现 ZVS，且电路纹波小，效率高，在满足整车低压电源要求的 前提下节省了能耗，提高了产品性能。

关键词: DC-DC 变换器；移相全桥；升压电路；零电压开关