A Wide Input Range, High-Efficiency Multi-Mode Active Rectifier for Magnetic Resonant Wireless Power Transfer System

Hyung-Gu PARK  SoYoung KIM  Kang-Yoon LEE  

Publication
IEICE TRANSACTIONS on Electronics   Vol.E96-C    No.1    pp.102-107
Publication Date: 2013/01/01
Online ISSN: 1745-1353
DOI: 10.1587/transele.E96.C.102
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Electronic Circuits
Keyword: 
rectifier,  wide input range,  wireless battery charging,  power conversion efficiency,  

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Summary: 
In this paper, a wide input range CMOS multi-mode active rectifier is presented for a magnetic resonant wireless battery charging system. The configuration is automatically changed with respect to the magnitude of the input AC voltage. The output voltage of the multi-mode rectifier is sensed by a comparator. Furthermore, the mode of the multi-mode rectifier is automatically selected by switches among the original rectifier mode, 1-stage voltage multiplier mode, and 2-stage voltage multiplier mode. In the original rectifier, the range of the rectified output DC voltage is from 9 V to 19 V for an input AC voltage from 10 V to 20 V. In the multi-mode rectifier, the input-range is wider compared to the original rectifier by 5 V. As a result, the rectified output DC voltage ranges from 7.5 V to 19 V for an input AC voltage from 5 V to 20 V. The proposed multi-mode rectifier is fabricated in a 0.35 µm CMOS process with an active area of around 2500 µm 1750 µm. When the magnitude of the input AC voltage is 10 V, the power conversion efficiency is about 94%.