Microwatt power consumption maximum power point tracking circuit using an analogue differentiator for piezoelectric energy harvesting

15th International Conference on Micro and Nanotechnology for Power Generation and Energy Conversion Applications

物理学;能源学

Chew, Z.J.^1 ; Zhu, M.^1

College of Engineering, Mathematics and Physical Sciences, University of Exeter, Exeter

EX4 4QF, United Kingdom^1

关键词: Full-wave bridges;    Macro fiber composite;    Maximum power point;    Maximum Power Point Tracking;    Mppt controllers;    Piezoelectric energy harvesters;    Piezoelectric energy harvesting;    Tracking efficiencies;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/660/1/012022/pdf
DOI  :  10.1088/1742-6596/660/1/012022

来源: IOP

【 摘 要 】

A maximum power point tracking (MPPT) scheme by tracking the open-circuit voltage from a piezoelectric energy harvester using a differentiator is presented in this paper. The MPPT controller is implemented by using a low-power analogue differentiator and comparators without the need of a sensing circuitry and a power hungry controller. This proposed MPPT circuit is used to control a buck converter which serves as a power management module in conjunction with a full-wave bridge diode rectifier. Performance of this MPPT control scheme is verified by using the prototyped circuit to track the maximum power point of a macro-fiber composite (MFC) as the piezoelectric energy harvester. The MFC was bonded on a composite material and the whole specimen was subjected to various strain levels at frequency from 10 to 100 Hz. Experimental results showed that the implemented full analogue MPPT controller has a tracking efficiency between 81% and 98.66% independent of the load, and consumes an average power of 3.187 μW at 3 V during operation.