High Step Down/Step Up Full Soft Switching Bidirectional DC-DC Converter Without Auxiliary Switches

In this paper, a new bidirectional DC-DC converter with full soft switching operation and high voltage gain is presented. The full soft switching is achieved by resonant elements and one-way switches. The diodes used in the proposed converter are not reverse parallel with switches and this helps to achieve the ZCS condition for switches. ZVS and ZCS operation are provided for the switches. Auxiliary switch is not used in the proposed converter and just one auxiliary inductor is used as an energy storage cell. This inductor transfers the energy to the output in boost mode and increases the output energy. Also, this causes to absorb the energy in buck mode and decreases the output energy. Therefore, the voltage gain of the proposed converter is increased more. The operation principles and structure analysis are presented. Finally, efficacy of proposed converter is validated via simulations performed by PSCAD software.