Energy recovery snubber circuit for a dc–dc push–pull converter

This study presents an active snubber recovery circuit for a dc–dc push–pull converter. Detailed waveform analysis and associated mathematical equations are presented, supported by PSpice simulations and experimentation. More importantly, unlike previous snubbers for the push–pull converter, the presented active recovery circuit remains fully functional over the complete duty cycle range. The proposed snubber technique is practically demonstrated on a 1 kW voltage-fed 48Vdc/560Vdc step-up push–pull converter. The experiments are conducted with a low-voltage and high-current source, typical of battery, supercapacitor, and photovoltaic source applications.