Research on multi-input self-powered piezoelectric energy harvesting interface circuit based on synchronous inversion and charge extraction

Aiming at the problem of low conversion efficiency of piezoelectric harvesting energy system, this study proposes a self-powered-synchronous inversion and charge extraction (SP-SICE) circuit on the basis of synchronous inversion charge extraction (SICE) circuit. The output voltage of the SP-SICE circuit is 63.6 % higher than that of the SICE circuit through simulation comparison, and the feasibility and correctness of the circuit are verified through comparison of experiment and simulation. To address the limited energy harvesting efficiency of a single piezoelectric element, in this study, multiple SP-SICE circuits are connected in series to obtain a multi-input self-powered synchronous inversion charge extraction (MSP-SICE) piezoelectric energy harvesting circuit for a multimodal piezoelectric energy trap. Both experimental and simulation results show that the output voltage of the MSP-SICE circuit is 172 % of the output voltage of the SP-SICE circuit with the same input source.