A Coupled Piezoelectric and Electromagnetic Energy Harvester with Feedforward and Feedback PWM converter for Vibrational Energy Harvesting
Electromagnetic, Piezoelectric, Energy Harvester, Boost Converter, PWM.
Harvesting energy from human body motion is becoming a popular aspect of interest recently. This energy is clean and can be very useful for energizing small devices like smartphone and watches. There are many ways available for harvesting energy from low frequency vibration sources, like piezoelectric harvesters, electrical mechanical harvesters, Triboelectric generators etc. This paper provides a design of coupled electromagnetic and piezoelectric generator where a free moving mass coupled with magnets moves inside a tube to generate electrical energy by induction and also by impact at both ends simultaneously, utilizing piezoelectric material. The output energy is then fed into a power conditioning circuit which consists of a harvester circuit and PWM DC-DC boost converter circuit. Harvester output at different frequency and at various load is tested. A DC-DC Converter model is developed in SIMULINK and simulated.