Energy Recycling Load System with a High Gain DC-DC Converter for Ultra Low Voltage Power Supplies

An energy recycling electronic load system with an input-parallel and output-series (IPOS) active clamping current-fed half-bridge converter is proposed in this paper. It is suitable for ultra low voltage high current DC power supplies in the burn-in test. The current-fed half-bridge converter has advantages of high voltage conversion ratio, low input current ripple and high efficiency. Its duty cycle range is wide, proper for the large input current. Moreover, the circuit component is reduced, for the clamp switches shares one clamp capacitor. The operational processes and design considerations are presented. Finally, a 1V/200A-input and 48V-output current-fed half-bridge converter is built for a 3kW electronic load system and the experimental results testify the effectiveness and feasibility.