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Electrostatic transducers for vibration energy scavenging have been an objectto numerous studies, but are still facing major issues relating to theirconditioning circuit. One of the most popular ones uses a charge pump and aflyback circuit based on a Buck DC-DC converter (Fig. 1). A commutation betweenthe energy accumulation in the charge pump and the recharge of the buffercapacitor Cres is assured by a switch which is the major bottleneck in theenergy harvester circuit. The commutation timing of the switch determines theefficiency of the energy harvesting. In previous papers [1] the switchcommutates periodically with some fixed duty ratio. However, this solution isnot appropriate when the environment parameters, e.g. the vibration frequency,change. We found that the switching should be ordered by the internal state ofthe circuit, an not by some fixed timing scenario. We presents how to find theoptimal operation mode of the harvester. To validate the study, the system wasmodeled using a mixed VHDL-AMS - ELDO model.

Optimization and AMS Modeling for Design of an Electrostatic Vibration  Energy Harvester's Conditioning Circuit with an Auto-Adaptive Process to the  External Vibration Changes