A self-powered multi-input OSECE interface circuit for multiple piezoelectric transducers

Abstract

A Self-Powered Multi-Input Optimized Synchronous Electric Charge Extraction (MI-OSECE) circuit for multiple Piezoelectric Transducers is presented in this paper. When the voltage of the Piezoelectric Transducers (PZT) reaches its peak value, the self-powered synchronous switches in the proposed circuit extract the partial charges and invert the remainder on the clamped capacitance C_p of PZT to achieve improved output power. In addition, it can be extensible to harvest energy from multiple PZTs with a single inductor configuration. The experimental results show that the proposed MI-OSECE circuit can harvest energy from multiple PZTs simultaneously; the Peak Output Power Ratio (POPR) and the factor BW_0.9 of the proposed circuit can reach 3.4 and 0.83, respectively, illustrate the harvesting ability and load adaptability of the proposed circuit.