A bidirectional isolated DC-DC converter with high efficiency and static
gain, formed by the combination of a FBZVS-PWM and a current fed
push-pull converter is presented in this paper. These features are
accomplished through a partial regeneration of the energy stored in the
transformer's leakage inductance with an active clamping voltage circuit
performed by a buck converter. Normally, current-fed push-pull
converters have an energy loss in passive snubber circuits. The
converter description, operation principles, waveforms, modeling, design
and the experimental results of a 2000 Watts prototype are presented.
The proposed converter can be implemented in high power applications
that require bidirectional power flow and galvanic isolation, such as DC
microgrids and electric vehicle battery chargers.