A Novel Soft Switching Bidirectional DC/DC Converter and Design Consideration

This paper proposes a new soft switching bi-directional DC-DC converter. The described converter employs the symmetric topology with high frequency transformer. It gets soft switching with the designed pulse-width modulation control, which guarantees soft switching in wide load range without any additional circuit components. Operation principle and the ZVS condition of the proposed converter are also analyzed. Inductors L₁ and L₂ are proven to have effect on the ZVS condition. Therefore, the parameter design is taken into account to ensure the soft switching. Furthermore, simplified method to calculate the inductor´s value is also introduced. Besides, the theoretical calculation, analysis and experimental results obtained from a 500 W prototype are also presented, which substantiates the design consideration