A piezoelectric and electromagnetic vibration energy harvesting system based on spring pendulum structure and MPPT control

Abstract

This letter proposes a spring pendulum piezoelectric and electromagnetic vibration energy harvesting (SP-PEVEH) system. The SP-PEVEH system consists of a spring pendulum harvester and an interface circuit. The spring pendulum harvester can simultaneously generate energy through piezoelectric and magneto-electric transducers. Additionally, the spring pendulum harvester has the capability to harvest multidirectional vibration energy. The interface circuit can transfer energy from the harvesters to the storage. The maximum power point tracking (MPPT) control is also implemented to achieve efficient energy conversion. The experimental results reveal that with a resonant frequency vibration of 26.4Hz and a maximum 1.5m/s² acceleration, the SP-PEVEH system can generate 11.63mW power. As compared with a conventional interface circuit without MPPT control, the output power is increased by 676%.