Energy harvesting dc offset and self-powered symmetrical slew rate class-abs op-amp rectifier

Abstract

This paper contains a self-powered rectifier in piezoelectric energy harvesting applications, and the main idea of the proposed system is to reset the transducer capacitance at optimal instants of time to maximize the extracted output power. Here the rectifier contains two switches and two active diodes. The active diodes used here decreases the voltage drop, leakage current and also avoids instability because the diodes used here are based on op-amps with a preset dc offset. And also in addition the controller used for the proposed rectifier is simple so reduces complexity and power dissipation .In order to decrease the power dissipation more and to obtain good skew rate here we replacing the Op-amp’s with preset offset voltage with Class-AB Op-amp’s. This rectifier is fabricated by 0.18µm technology of CMOS.

Keywords:Piezo electric; energy harvesting; dc offset; symmetrical slew rate; class-ab op-amp; self-powered rectifier.