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Autonomous energy supply for electronic grains and wireless sensors

: Hahn, R.

Frequenz 58 (2004), No.3-4, pp.87-91
ISSN: 0016-1136
ISSN: 2191-6349
Journal Article
Fraunhofer IZM ()

Effective power supply of autonomous electronic systems and sensor nodes is a major challenge and a limiting factor for the performance. In general two methods are possible to provide the power: store the needed amount of energy on the node or scavenge available ambient power at the node. As the system size decreases, designing a sufficient energy supply is getting more and more difficult. Starting with an overview of power supply technology for wireless systems, the development of micro fuel cells as future high energy density systems and the wafer-level-technology for secondary micro batteries developed at Fraunhofer IZM is described. Demonstration systems of one square centimetre area and 200 pm thickness deliver 40 mW and 5 to 20 mW with micro fuel cells and Li-polymer batteries respectively.