Novel soft switching PWM converter using a new parallel resonant DC-link

A novel soft switching pulsewidth modulated (PWM) converter for high-frequency AC/DC and/or DC/AC power conversion is presented by using a parallel resonant DC-link (PRDCL) and by adopting single-phase soft switching (SPSS) technique. The PRDCL provides variable link pulse position as well as variable link pulse width, which is a quite different feature from the other resonant DC-links, and thus the PWM capability can be increased. The SPSS technique is adopted for further enhancement of PWM capability. Moderate combination of two soft switching operations enables the conventional space vector PWM technique to be used. Due to distinctive advantages, including true PWM capability, minimum device voltage stresses, and reasonable additional device count, the proposed converter can be operated in a wide power range (20-200 kW). Operational principles, analyses, and the realization of a space vector PWM of the proposed converter are presented. Simulation results are shown to verify the operational principle