Half-bridge ZVS DC/DC converter is a kind of DC/DC converter which has good performance, its switching valve moves under zero potential soft switch condition, switch loses slightly, simple structure, complied with the development trend of direct-current power supply miniaturization and high frequency, therefore it's widely researched and applied in the high efficiency DC/DC transformation situation. Carried on theoretical analysis, simulation and experimental study revolves around questions like half bridge ZVS PWM DC/DC converter working principle, soft switch realization, main circuit selection and voltage single link control and so on.