An AC-DC Interleaved ZCS-PWM Boost Converter With Improved Light-Load Efficiency

The paper proposes a novel AC-DC PWM boost converter with interleaving and ZCS that requires the use of just a single active auxiliary switch to assist in the turning on of the main power circuit switches with ZCS. The auxiliary switch can be turned on and off with ZCS and its auxiliary circuit allows the converter to operate without an increase in the main switch peak current or voltage stress; it also allows the converter to operate more efficiently with light loads that other previously proposed ZCS-PWM converters. The proposed converter's operation is explained in this paper and its key features and design consideration are discussed. Experimental results that confirm the operation of the proposed converter are presented as well.