Single-stage AC–DC voltage regulator for 15 W wireless charging

Single-stage AC–DC voltage regulator for 15 W wireless charging

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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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      • 1. Qi Standard: ‘System Description Wireless Power Transfer Volume I: Low Power Part 1: Interface Definition Version 1. 1.2’,, June 2013.
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      • 2. Shinoda, R., Tomita, K., Hasegawa, Y., Ishikuro, H.: ‘Voltage-boosting wireless power delivery system with fast load tracker by ΔΣ-modulated sub-harmonic resonant switching’. Solid-State Circuits Conf. (ISSCC), San Francisco, USA, February 2012, pp. 288290, doi: 10.1109/ISSCC.2012.6177018.
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      • 3. Lee, H.-M., Ghovanloo, M.: ‘An adaptive reconfigurable active voltage doubler/rectifier for extended-range inductive power transmission’. Solid-State Circuits Conf. (ISSCC), San Francisco, USA, February 2012, pp. 286288, doi: 10.1109/ISSCC.2012.6177017.
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