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RF-powered Li-ion battery charger for biomedical applications

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4 Author(s)
Chih-Wen Chuang ; Department of Electronics Engineering, National Chiao Tung University, 1001 Ta Hsueh Road, Hsinchu, Taiwan (R.O.C.) ; Ericson Go Chua ; Yu-Sheng Lai ; Wai-Chi Fang

An integrated RF-powered Li-ion battery charger solution has been developed for biomedical applications. RF energy received through an antenna is rectified, regulated, and passed on to a battery charger circuit that charges a Li-ion battery efficiently and accurately. The charger system has been implemented using UMC 90 nm BiCMOS process library. Experimental results show that a battery model with internal resistance of 300 mOmega and internal capacitance of 10 mF can be charged to its full capacity at 3.5 V in 0.2 ms by a 2 mW 10 MHz RF power source referred from the antenna. The implemented charger circuit consumes only 240 uW.

Published in:

Life Science Systems and Applications Workshop, 2009. LiSSA 2009. IEEE/NIH

Date of Conference:

9-10 April 2009