A 6.78MHz 92.3%-Peak-Efficiency Single-Stage Wireless Charger with CC-CV Charging and On-Chip Bootstrapping Techniques

Abstract

A fully-integrated wireless charger that realizes voltage rectification, voltage regulation and CC-CV charging in a single power stage is proposed to achieve high efficiency and low cost and volume. A bootstrapping technique is also proposed to integrate bootstrap capacitors on-chip. The charger was designed in a standard 0.35 μm CMOS process with a die area of 8mm2, and the measured peak efficiency reaches 92.3% and 91.4% when the charging currents are 1A and 1.5A, respectively.