A highly efficient Micro-Power Converter between a Solar Cell and a Rechargable Lithium-ion Battery

A.C. Woerd, van der, M.A. Bais, L.P. Jong, de, A.H.M. Roermund, van

Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademicpeer-review

2 Citations (Scopus)
1 Downloads (Pure)

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.
Original languageEnglish
Title of host publicationSmart structures and materials 1998: smart electronics and MEMS, San Diego, 1998
EditorsV.K. Varandan, R.A. Singer, M.J. Vellekoop
Place of PublicationBellingham
PublisherSPIE
Pages315-325
DOIs
Publication statusPublished - 1998

Publication series

NameProceedings of SPIE
Volume3328
ISSN (Print)0277-786X

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