Title :
A capacitor-based AC-DC step-up converter for biomedical implants
Author_Institution :
Alfred Mann Found., Santa Clarita, CA, USA
Abstract :
An AC-DC step-up converter architecture for generating multiple compliance voltages (CVs) in an inductive powered biomedical implant is proposed. Switches and active rectifiers are used inside the converter for charging capacitors from the AC input and delivering currents to the loads. Regulated CVs with high power efficiency are obtained by controlling the on/off times of the switches using feedback loops. For a 1MHz, 2.3V peak AC input, a power efficiency of 92.9% for a combined load power of 12.3mW on 4 CVs (±3V and ±3.6V) was achieved in a 0.18μm CMOS process.
Keywords :
AC-DC power convertors; CMOS integrated circuits; biomedical electronics; capacitors; feedback; prosthetics; rectifiers; CMOS process; active rectifier; capacitor-based AC-DC step-up converter; charging capacitor; efficiency 92.9 percent; feedback loop; frequency 1 MHz; inductive powered biomedical implant; multiple CV generation; multiple compliance voltage generation; power 12.3 mW; size 0.18 mum; switching rectifier; voltage -3 V; voltage -3.6 V; voltage 2.3 V; voltage 3 V; voltage 3.6 V; Capacitors; Feedback loop; Implants; Rectifiers; Regulators; Voltage control;
Conference_Titel :
Custom Integrated Circuits Conference (CICC), 2011 IEEE
Conference_Location :
San Jose, CA
Print_ISBN :
978-1-4577-0222-8
DOI :
10.1109/CICC.2011.6055373
