A self-powered PSSHI and SECE hybrid rectifier for piezoelectric energy harvesting

Abstract

A hybrid rectifier integrating the parallel-type synchronized switching harvesting on inductor (PSSHI) and synchronous electric charge extraction (SECE) is proposed. The hybrid rectifier can self-adjust its operations between Flipping/SECE and PSSHI/SECE according to the input PE voltage. Furthermore, a simple circuit implementation with the capability of cold-start and self-power is presented. The prototyped rectifier can extract the peak power of 85.7µW with the PE open-circuit voltage of 3V and the rectified voltage of 4.14V. Its performance is at least twice that of the full-wave bridge rectifier in terms of peak output power and operating voltage range. It can cold-start successfully from a lower PE voltage and charge the load to a higher voltage.