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A low power battery management system for rechargeable wireless implantable electronics

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3 Author(s)
Pengfei Li ; Dept. of Electr. & Comput. Eng., Florida Univ., Gainesville, FL, USA ; R. Bashirullah ; J. C. Principe

An integrated battery management system for low power wireless implantable electronics is presented herein. The system is designed for miniature implantable Li-ion rechargeable batteries with limited cell capacity and employs a new control loop that relaxes comparator resolution requirements, provides simultaneous operation of constant-current and constant voltage loops, and eliminates the external current sense resistor from the charging path. The accuracy of the end-of-charge detection is primarily determined by the voltage drop across matched resistors and current-sources and the offset voltage of the sense comparator. Preliminary simulations in 0.5mum bulk CMOS technology indicate that plusmn1% (or plusmn15muA) end-of-charge accuracy can be obtained under worst-case conditions for a comparator offset voltage of plusmn5mV. The proposed battery control loop measures roughly 170mum by 960mum and dissipates approximately 150muWatts

Published in:

2006 IEEE International Symposium on Circuits and Systems

Date of Conference:

21-24 May 2006