An Improved Single-Phase Direct PWM Inverting Buck–Boost AC–AC Converter.

A single-phase inverting buck–boost ac–ac converter is proposed in this paper. The proposed converter has no shoot-through and dead-time problems and, like conventional dc–dc converters, it can be operated with simple pulse width modulation (PWM) control. It offers high frequency and high efficiency operation because high speed <sc>mosfet</sc> can be used as switching device without the reverse recovery issues and losses of its body diode. The proposed converter features quasi-continuous input and output currents, high input power factor, low total harmonic distortion of input and output currents, and high efficiency. A 460 W laboratory prototype was constructed and tested with interleaved and complementary PWM controls using a resistive and inductive load. Detailed experimental results are provided to show the novelty of the proposed converter. Experimental results confirmed that the proposed converter can obtain 93.8% efficiency at 60 kHz switching frequency. [ABSTRACT FROM PUBLISHER]