低电压电流应力的有源钳位ZVS软开关技术

Active clamped zero-voltage switching (ZVS) soft switching topology is widely used in DC/DC converters to realize ZVS for the main switches. The traditional active clamped soft switching topology with the disadvantages of high voltage stress, high current stress and larger duty cycle loss will result in poor performances when used in high power DC/DC converters. A new active clamped soft switching topology was proposed in this paper. By adding a current transfer circuit composed of a diode and an auxiliary inductor to the traditional topology, the current stress, clamping voltage and duty cycle loss were all halved, which would result in high efficiency and reliability of the converter. The working principles of the proposed active clamped soft switching topology applied to Buck converter and Boost converter were analyzed and the performances analysis and parameters design of the topology were carried out. Finally, the experimental verification of the proposed active clamped soft switching topology was carried out based on a 1.2kW Buck prototype converter and Boost prototype converter.