A self oscillated half bridge converter using impulse resonant soft-switching

A novel circuit of DC-TO-DC converter for the battery charger of telecommunication equipment is proposed. For the circuit, a novel self oscillated half-bridge converter with an impulse resonant soft-switching using saturating inductance of the oscillator is developed. In this converter, the self oscillated frequency control circuit has the switches operated soft-switching by impulse charging and discharging the parasitic capacitance of the main switches and also driving circuit of the switches. The complete operating principle and theoretical analysis on the proposed converter are provided. The experimental results of a 2 kW prototype converter operating at 100 kHz with 200 V AC input are presented and discussed.