A Multi-Input Noninterruptive MPPT Technique Based on FCPV Method for Piezoelectric Energy Harvesting

This article presents a multi-input piezoelectric energy harvester (PEH) with the multi-input series synchronized switch harvesting on inductor (MIS-SSHI) rectifier and noninterruptive maximum power point tracking (MPPT) technique. The proposed MPPT solution tracks the vibration states of multiple piezoelectric transducers (PZTs) using the fractional cumulative peak voltages method, ensuring the maximum power output for the MIS-SSHI rectifier. In addition, the proposed method captures the peak working voltages of multiple PZTs for MPPT without interrupting the energy harvesting process for open-circuit voltage detection. To validate the effectiveness of this multi-input PEH, an experimental platform is built for performance evaluation. The experiment results confirm the feasibility of the proposed MPPT solution for multi-input rectifiers, achieving a peak MPPT efficiency of up to 98%.