Vibration energy harvesting: Leti files three patents

Leti researchers recently filed three patents for vibration energy harvesting microsystems. Their new technology counters one of the weaknesses of vibration energy harvesting systems: the systems’ yields drop off sharply when their resonance frequency deviates from the ambient vibration frequency.
Currently, the best systems can tolerate vibration frequency differences of just 5%. But the first two systems designed by Leti maintain their energy yields in environments with vibration frequency differences of up to 40%. This was achieved by modifying the rigidity of the piezoelectric beam used in the system to alter its resonance frequency.
The third system designed by Leti can be used in environments with vibration frequencies of any magnitude—even non-periodic vibrations. However, some kinks still need to be ironed out

Contact : ghislain.despesse@cea.fr

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