Abstract
A single-stage AC–DC voltage regulator is proposed to enhance the power efficiency while at the same time reducing the design complicity of the entire system. Unlike the traditional two-stage AC–DC regulator, a pulse-width modulation control algorithm is integrated to switch the working mode of an active rectifier between a charging mode and a zero mode to maintain the output voltage at 5 V. This in turn efficiently eliminates the need for a DC–DC converter following the rectifier. Besides, a coupled full-bridge active rectifier with high speed comparator dramatically reduces the power loss of the circuit. Experiment results using a 0.35 µm technology and a PCB circuit demonstrate the advantages of the proposed design.
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