Self-powered multi-PZTs energy harvesting interface based on extensible PSSHI rectification with power region optimization technique

Abstract

This paper proposes a self-powered multiple piezoelectric (multi-PZTs) energy harvesting interface based on extensible parallel synchronized switching harvesting on inductor (PSSHI) rectification with power region optimization technique. The extensible PSSHI rectifier can accept multi-PZTs voltages input with arbitrary phase, thus addressing the charge conflict problem. The power region optimizer can assist the rectifier to operate within the high output power region. Meanwhile, all active devices in the circuit are powered by the harvested energy. Finally, the experimental results show that the average charging power of the circuit is 559.8µW, and the energy conversion efficiency is 80.7%. Compared with the extensible PSSHI rectifier without power region optimization, the average charging power in this circuit is increased by 94%. Additionally, the experimental tests indicate that the interface circuit can completely realize cold start and self-power supply.