A new switching strategy for PWM power converters

This paper presents a new switching strategy for PWM power converters. The proposed switching strategy is a kind of dead time minimization method. The proposed method can reduce the discontinuous phenomenon of the current, which occurs in the conventional dead time minimization method, at the changing instant of the current polarity. Although the dead time is applied in every current polarity changing points, the dead time should be not always adopted in the proposed method. Especially, in the current control of PWM power converters, the proposed switching strategy can be easily constructed by using the polarity information of the reference current instead of the real current. Therefore, there are no more problems that would be caused by real current detection. In this paper, in order to confirm the usefulness of the proposed switching strategy, experimental results that are applied in single phase inverter with passive loads, three phase inverter for induction motor drives, three phase AC/DC PWM converter, three phase active power filter and class-D amplifier are presented.