Microsystem for harvesting vibration energy at low mechanical frequencies
For embedded systems, battery liftetime is often a critical issue and finding ways to increase it could provide major benefits. For example, improving the battery lifetime of pacemakers would postpone the chirurgical operation needed to replace the battery, while for smart clothes, tackling the battery issue would open a wide range of new applications.
When the embedded system is a wearable one, it is possible to harvest the mechanical energy due to human movements and convert it into electrical energy. But mechanical energy harvesters work efficiently only at a given mechanical frequency which is linked to their size. So when it comes to designing a miniature energy harvester, the mechanical frequency generally exceeds 100 Hz, far beyond the spread of human movements.
Our MEMS electrostatic harvester has an internal structure designed to provide electrical power efficiently at low and wideband frequencies, making it suitable for wearable devices.
Competitive advantages :
Keywords : Vibration energy Harvesting, MEMS, Low frequency operation, Electrostatic transducer