Next Generation Zero-Voltage Soft-Switched PWM Three-Phase AC-DC Active Power Converter

A high-perfomance ZVS-PWM three phase AC/DC active power converter using a newly proposed transformer-assisted Quasi-Resonant DC Link (TQRDCL) is described in this paper. The operating principle of this TQRDCL which has such excellent features as minimum dc bus voltage stress and no comlexity in predictive initializing resonant inductor current control under load fluctuations is discussed. A simple circuit control and the design procedure are offered. The time-shared instantaneous space-voltage vector PWM is inrtoduced as the control method for ZVS three phase AC/DC active power converter and its performance evaluations are illustrated using simulated results.