A Li-ion Battery Charging Design for Biomedical Implants

作者:Huang Chi Chun*; Yen Shou Fu; Wang Chua Chin
来源:IEEE Asia Pacific Conference on Circuits and Systems (APCCAS 2008), 2008-11-30 to 2008-12-03.

摘要

A Li-ion battery charging design for wireless medical implants is presented. Not only the power density is limited in the medical implants, but also the inherent lack of efficiency in a wireless powered system restricts the stability of power supply for medical implants. Therefore, a simple and power saving circuit is proposed to charge the Li-ion battery with 0.1 C. In order to resist the ripple of the voltage supplied of the carrier wave from the inducing coil, a special bias circuit to generate a bias voltage which varies with supply voltage has been designed. Moreover, the proposed design with a protection circuit can limit over-charge voltage or the Li-ion battery to prevent any damage.