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

[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.

[发布机构] College of Engineering, Mathematics and Physical Sciences, University of Exeter, Exeter; EX4 4QF, United Kingdom^1

[效力级别] 能源学

[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