An interface circuit prototype for a vibration-based electromagnetic energy harvester

This paper describes the interface electronics for a vibration based Electromagnetic (EM) energy harvester, which works on the mechanical frequency-up-conversion principle. The interface electronics is used to step up and rectify the harvested AC signal of the energy harvester through a two-stage charge-pump circuit. Output voltage of 4.5 V with 2.5% ripple has been demonstrated at a load current of 5 μA. The maximum power efficiency is 35% with an output voltage and current range of 2-2.5 V and 15-20 μA respectively. Furthermore, a synchronous rectifier was powered by the energy harvester to verify usage under active loading conditions.