A high power density soft switching bidirectional converter using unified resonant circuit

This paper proposes a high efficiency bi-directional converter with high power handling capability. Soft switching technique is endowed with all power switches by using an auxiliary unified resonant circuit. Zero voltage switching (ZVS) and zero current switching (ZCS) modes are implemented for all power switches in boost operation. For buck mode of operation, ZVS and ZCS are executed for most of the power switches. Voltage stresses for all of the power switches are significantly reduced. Additionally, the proposed converter has a high step up and step down gain compared to a conventional bi-directional converter. The circuit is simulated in PSPICE and performance parameters are measured and verified.