New conceptual three-phase current-fed soft switching pulse width modulation converter with switched capacitor type resonant dc link

This paper presents a novel prototype of three-phase current-fed PWM conver ter with a switched capacitor type resonant de link snubber circuit, which can basically operate under a principle of zero current soft switching comm utation. The optimum PWM pattern-based control scheme proposed by the autho rs is effectively applied for this active converter. In this paper, the ste ady-state operating principle of a new converter circuit treated here is de scribed. The practical design procedure of this converter is discussed from a theoretical point of view. The feasible experiment to confirm zero curre nt soft switching commutation of this converter is concretely implemented a nd evaluated herein.