Design of a Double-Half-Bridge Rectifier With Single-Stage and Power Decoupling

Several power decoupling techniques have been studied in the specialized literature to reduce or eliminate the ripple at 120 Hz intrinsic to the nature of single-phase AC-DC converters. Among these techniques are the active decoupling circuits, which insert new switches and passive elements in the circuit to increase costs and losses in the converters. The complete single stage (CSS) of power decoupling is defined in this study. The switches responsible for controlling the power factor in the proposed converter also control the output voltage and the ripple at 120 Hz using the phase-shift technique. Thus, lower-value capacitors can be used, allowing the replacement of the widely used electrolytic capacitors with film capacitors, which have a long useful life compared to the former. In addition, the proposed converter is isolated and has high efficiency. Simulation and experimental results are presented for a 1 kW prototype with an efficiency of up to 93%, showing that power decoupling is obtained, and the CSS topology definition can be incorporated into the literature.