[논문]A 6.78-MHz Single-Stage Wireless Charger With Constant-Current Constant-Voltage Charging Technique

Cheng, Lin; Ge, Xinyuan; Ng, Wai Chiu; Ki, Wing-Hung; Zheng, Jiawei; Kwok, Tsz Fai; Tsui, Chi-Ying; Liu, Ming

doi:10.1109/jssc.2019.2961852

[해외논문] A 6.78-MHz Single-Stage Wireless Charger With Constant-Current Constant-Voltage Charging Technique

IEEE journal of solid-state circuits, v.55 no.4, 2020년, pp.999 - 1010

Cheng, Lin (University of Science and Technology of China, School of Microelectronics, Hefei, China) , Ge, Xinyuan (The Hong Kong University of Science and Technology, Hong Kong) , Ng, Wai Chiu (The Hong Kong University of Science and Technology, Hong Kong) , Ki, Wing-Hung (The Hong Kong University of Science and Technology, Hong Kong) , Zheng, Jiawei (The Hong Kong University of Science and Technology, Hong Kong) , Kwok, Tsz Fai (The Hong Kong University of Science and Technology, Hong Kong) , Tsui, Chi-Ying (The Hong Kong University of Science and Technology, Hong Kong) , Liu, Ming (Institute of Microelectronics, Chinese Academy of Sciences, Beijing, China)

Abstract ▼ AI-Helper

A 6.78-MHz fully integrated single-stage wireless charger with constant-current constant-voltage (CC-CV) charging technique for resonant wireless power transfer applications is presented. Based on the principle of three-mode reconfigurable resonant regulating ( $R^{3}$) rectifier, the proposed charger achieves high efficiency and low cost by realizing power rectification, voltage regulation, and CC-CV charging in a single power stage. The power stage of the proposed charger consists of only four nMOS power transistors. A bootstrapping technique using a single-input-dual-output voltage doubler with adaptive phase control is also proposed to integrate bootstrap capacitors on-chip. The CC loop and the CV loop share the same pulsewidth modulation (PWM) controller with smooth transition from the CC mode to the CV mode. An on-chip current sensing and estimation circuit is specially designed for the CC loop. Fabricated in a standard 0.35- $\mu \text{m}$ CMOS process with a die area of 8 mm2, the charger delivered a maximum charging current of 1.5 A, and the measured peak efficiency reached 92.3% and 91.4% when the charging currents were 1 A and 1.5 A, respectively.

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[해외논문] A 6.78-MHz Single-Stage Wireless Charger With Constant-Current Constant-Voltage Charging Technique

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