Research-based on a low-frequency non-contact magnetic coupling piezoelectric energy harvester

This study proposes a novel low-frequency non-contact magnetically coupled piezoelectric energy harvester for harvesting at sea wave energy. The water drift and Pendulum-shaped structure in the piezoelectric energy harvester solves the problem of capturing the weak energy at sea to some extent. Moreover, the rocker in the piezoelectric energy harvester can increase the number of magnet excitation per unit time, thus increasing the power generation efficiency. This experiment investigates the effect of the output voltage at different magnet spacing d and drift radius L. The maximum voltage of the rectangular piezoelectric patches was 7.14 V when the experiment was conducted when the water flow rate reached 1.6 × 104 L/h and the magnet spacing and float radius were 20 mm and 24 mm respectively. At this point, the rms voltage and power of the rectangular piezoelectric patches are 11.93 V and 0.016 μW, respectively when the resistance of external resistance box is 4 MΩ. As verified by a series of application experiments, the piezoelectric energy harvester can light up 16 light-emitting diodes under the excitation of a water flow rate of 1.6 × 104 L/h. The results show that the prototype has great promise for microelectronic devices and wireless sensing network systems that work on water.