A Zero-Current-Transition Converter with Reduced Auxiliary Circuit Losses

Inhalt:
A new zero-current switching (ZCS) pulse-width modulated (PWM) boost converter is proposed in the paper. The main power switch in the proposed converter can operate with ZCS due to an active auxiliary circuit that diverts current away from the switch just before it is turned off. The circuit allows the converter to operate with ZCS without the disadvantages typically found in other, previously proposed ZCS PWM converters such as increased switch stresses and excessive circulating current. In the paper, the operation of the proposed converter is explained in detail and general design guidelines are given. The feasibility of the new converter is confirmed with results obtained from an experimental prototype.