A new paper form NiPS on the Journal of Wireless Sensor Network
Nonlinear bi-stable vibration energy harvester at work
Francesco Orfei, Igor Neri, Helios Vocca, Luca Gammaitorni
An extreme low power energy rectification, storage and management circuitry has been developed and used to power a small digital wireless sensor with a piezoelectric non-linear bi-stable vibration energy harvester for automotive application. All the system has been designed with off-the-shelf components and sends data in the 2.4 GHz band.
Please downoload the paper here: http://www.journal.wsnmagazine.com/index.php/journal/article/view/4