关键词: DC-DC 变换器；移相全桥；升压电路；零电压开关

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