Project µNRJ (2006-2008)

"Vibration energy harvesting using an electret-free electrostatic silicon-based transducer"


Grant : ANR JCJC 2005 n°54551



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Objectives    
Results
Publications



Objectives

Fabrication of a resonant batch-processed, silicon-based and electret-free MEMS Vibration Energy Harvester (VEH).

This work is now continuing through the SESAM project which adress a multi-source and  multi-load system, in collaboration with the CEA-LETI and the TIMA-lab.


pdf-ico.gifFor general informatoions on applications of energy harvesting, read the short paper in  Micronews (2008/10): "MEMS energy harvesting devices, great technology:For which markets?"

Results

We have fabricated a 11x6.5 mm² VEH in a silicon/glass technology with in-plane motion. Using a charge-pump like conditioning circuit, the device converts, from the mechanical to the electrical domain, 60 nW on a 60 MOhms load at 250 Hz and for an external vibration acceleration of 0.25 g. If implemented in a triangular constant-charge scheme, the maximum harvested power would be around 500 nW.


3D-schematic of the  VEH



Pictures of the fabricated VEH

Related publications

Journals

PhD dissertation

Conferences

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