Soft Switching Stacked-Up Boost Push-Pull Converter

This work describes boost type push-pull converter with actives rectification based on center tapped topology. It is shown that active rectification not only reduce static losses but makes converter bidirectional, which can be used to charge accumulator battery as well. Besides that active rectification makes transfer function linear down to the idle by recuperation input filter energy. Control method to minimize static losses has been proposed. Commutation transitions have been analyzed. It is shown that inductor current reversal due to active rectifier employed provides resonant discharge of intrinsic capacitances and soft commutation for switching transitions of low side transistors. Soft commutation of high side transistors is provided by inductor current inertia. Prototype has been developed to verify analysis validity. Soft commutation has been confirmed. Efficacy achieved is 98.5%.