A Practical ZCS-PWM Boost DC-DC Converter With Clamping Diode-Assisted Active Edge-Resonant Cell and Its Extended Topologies

This paper presents the performance evaluations of a zero current soft-switching pulse width modulation (ZCS-PWM) boost dc-dc converter with a practical active edge-resonant cell (AERC). The AERC treated and discussed herein has auxiliary diodes for suppressing voltage surges and current ringings at the commutations of active switches in the dc-dc converters. The voltage surges together with the current ringings can be effectively eliminated in the AERC owing to the effect of the clamping diodes. Therefore, voltage ratings of the active switches can be considerably reduced as compared to the classical AERC without the clamping diodes, consequently the conversion efficiency can be improved in the ZCS-PWM boost dc-dc converter. The practical effectiveness of the clamping diode-assisted ZCS-PWM boost dc-dc converter is demonstrated in detail by means of experimental verifications based on a 1.6 kW-40 kHz laboratory prototype. In addition, an extended topological family of nonisolated ZCS-PWM dc-dc converters employing the practical AERC is originally described for demonstrating the high scalability of the AERC.