A NEW SOFT-SWITCHED, THYRISTOR-BASED, REGENERATIVE, QUASI-RESONANT, CURRENT REGULATED INVERTER

A variety of soft-switching techniques have been proposed to reduce th e switching losses and EMI problems that occur with higher switching f requencies in hard-switched converters. In this paper, a new, quasi-re sonant, soft-switched, three-phase inverter is presented which uses 12 thyristors as the power electronic switches, and hence has potential for use in high-power applications. The converter is fully current-reg ulated, suitable for high-performance motor drive applications, and is capable of 4-quadrant operation to allow regeneration back into the d c supply. The operation and the control of the inverter are described in detail and simulation and experimental results are presented.