Highly efficient micro-power converter between a solar cell and a rechargeable lithium-ion battery

Albert C. van der Woerd; Michel A. Bais; Leo P. de Jong; Arthur H.M. Van Roermund

doi:10.1117/12.320184

20 July 1998 Highly efficient micro-power converter between a solar cell and a rechargeable lithium-ion battery

Albert C. van der Woerd, Michel A. Bais, Leo P. de Jong, Arthur H.M. Van Roermund

Proceedings Volume 3328, Smart Structures and Materials 1998: Smart Electronics and MEMS; (1998) https://doi.org/10.1117/12.320184
Event: 5th Annual International Symposium on Smart Structures and Materials, 1998, San Diego, CA, United States

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.

Citation Download Citation

Albert C. van der Woerd, Michel A. Bais, Leo P. de Jong, and Arthur H.M. Van Roermund "Highly efficient micro-power converter between a solar cell and a rechargeable lithium-ion battery", Proc. SPIE 3328, Smart Structures and Materials 1998: Smart Electronics and MEMS, (20 July 1998); https://doi.org/10.1117/12.320184

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