A reduced parts count realization of the resonant snubbers for high power current stiff converters

Resonant snubbers have been shown to present significant advantages over classical RCD snubbers in current stiff converters (CSC). In this paper, a new realization of resonant snubbers in CSC topologies is introduced requiring only two extra thyristor-type devices. The rating of these snubber switches is shown to be significantly lower than the ratings of the main converter. A complete discussion of the control issues related to this topology is presented. The compatibility of the resultant CSC topology with PWM methods is investigated and compared with a previously presented resonant realization employing six snubber switches. Simulation results are included to illustrate the CSC performance and support the topology analysis presented in this paper.