In this paper, a new soft-switched zero-current transition and zerovoltage transition (ZCZVT) converter is proposed for family pulse width modulation (PWM) DC-DC converters. The proposed new converter assures the main switch turning on under zero-voltage transition and turning off under zerocurrent transition. The proposed new converter also decreases electromagnetic interference noises and operates under soft switching in a wide input voltage range. There is no additional voltage or current stress on the main devices. The proposed converter has low cost and simple control and structure. The theoretical analysis of the converter is clarified and the operating intervals are given in detail.The experimental results of the converter are obtained by a prototype with 500 W and 100 kHz. The overall efficiency of the proposed converter is 98.5% at nominal output power.