Lin Cheng, Xinyuan Ge, Wai Chiu Ng, W. Ki, Jiawei Zheng, T. Kwok, C. Tsui, Ming Liu
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Design of a Single-Stage Wireless Charger with 92.3%-Peak-Efficiency for Portable Devices Applications
This summary presents a fully-integrated wireless charger to achieve high efficiency with low cost and volume. The charger realizes power rectification, voltage regulation and CCCV charging in one power stage only. A bootstrapping technique is also designed for on-chip integration of the bootstrap capacitors. A chip prototype was fabricated in a standard 0.35μm CMOS process with a die area of 8mm2. The charger achieves peak efficiency of 92.3% and 91.4% when the charging currents are 1A and 1.5A, respectively.
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