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Proceedings Paper

Highly efficient micro-power converter between a solar cell and a rechargeable lithium-ion battery
Author(s): Albert C. van der Woerd; Michel A. Bais; Leo P. de Jong; Arthur H.M. Van Roermund
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Paper Abstract

This paper describes the design of a low-power photo-voltaic power converter which will be used in a directional hearing aid. It is argued, that the use of a switched-capacitor converter is needed when integration on a chip is demanded. This converter combined with a parallel power converter has an efficiency that lies between 70% and 85%. This efficiency depends on the charging voltage of the implemented rechargeable thin-film lithium-ion battery. This battery will be glued at the back side of the power-converter chip. The converter is controlled by a maximum-power-point-tracker to perform maximum charging of the battery under the varying conditions of the solar cell. The controller is adapted to operate with a switched-capacitor converter. This paper also shows a structured derivation of the necessary solar cell area. The complete power converter has been designed in a custom CMOS process and the major part of the circuit operates in the sub-threshold area.

Paper Details

Date Published: 20 July 1998
PDF: 11 pages
Proc. SPIE 3328, Smart Structures and Materials 1998: Smart Electronics and MEMS, (20 July 1998); doi: 10.1117/12.320184
Show Author Affiliations
Albert C. van der Woerd, Delft Univ. of Technology (Netherlands)
Michel A. Bais, Delft Univ. of Technology (Netherlands)
Leo P. de Jong, Delft Univ. of Technology (Netherlands)
Arthur H.M. Van Roermund, Delft Univ. of Technology (Netherlands)

Published in SPIE Proceedings Vol. 3328:
Smart Structures and Materials 1998: Smart Electronics and MEMS
Vijay K. Varadan; Paul J. McWhorter; Richard A. Singer; Michael J. Vellekoop, Editor(s)

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