Title :
RF-powered Li-ion battery charger for biomedical applications
Author :
Chuang, Chih-Wen ; Chua, Ericson Go ; Lai, Yu-sheng ; Fang, Wai-Chi
Author_Institution :
Dept. of Electron. Eng., Nat. Chiao Tung Univ., Hsinchu
Abstract :
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.
Keywords :
BiCMOS integrated circuits; battery chargers; prosthetic power supplies; secondary cells; RF power source; RF-powered Li-ion battery charger; UMC BiCMOS process; battery charger circuit; biomedical applications; capacitance 10 mF; frequency 10 MHz; internal capacitance; internal resistance; power 2 mW; power 240 muW; resistance 300 mohm; time 0.2 ms; voltage 3.5 V; Batteries; Conferences;
Conference_Titel :
Life Science Systems and Applications Workshop, 2009. LiSSA 2009. IEEE/NIH
Conference_Location :
Bethesda, MD
Print_ISBN :
978-1-4244-4292-8
Electronic_ISBN :
978-1-4244-4293-5
DOI :
10.1109/LISSA.2009.4906742
