Low‐frequency vibration‐based interdigital piezoelectric energy harvester and autonomous power regulating circuit

Abstract

According to the difficult replacement and poor endurance of the battery for wireless sensor network nodes, a low-frequency vibration-based interdigital piezoelectric energy harvester and power regulating circuit (PRC) have been developed in this Letter. The proposed vibration pickup structure consists of a rectangular flexible frame and series of cantilever beams interdigitally bonded to it. An efficient autonomous PRC with the function of energy storage, switch control, voltage regulation was also proposed. Experiment results show that a maximise output power of 18.8 μW could be produced by the proposed vibration energy harvesting system. The system's energy conversion efficiency could reach up to 72.3%, which made it the promising candidate of power supply for low power micro electron devices.

Experimental Frequency Tuning Methodology of a Cantilever Piezoelectric Harvester Validated in a Multimodal Transportation

“…Wind motion for example [19] can provide a root mean square (RMS) voltage of 160.2 V and a maximum output power of 2566.4 µW at a wind speed of 14 m/s. Ambient vibrations are more difficult to use mainly due to their low amplitudes [20], which leads to the use of alternative structures [21]. Acoustic energy is also used to harvest energy from noise [22], or even vibration caused by rain is scavenged to get 2076 µJ of energy over a duration of 301 min [23].…”

A self-powered zero-quiescent-current active rectifier for piezoelectric energy harvesting

“…Thus, there is a growing demand for a self-consistent sensor node that harvests minute amounts of energy from the environment [1]. Piezoelectric energy harvesting has been widely studied, due to the availability of vibration energy, the high output voltage of piezoelectric energy harvesters (PEHs) and easy integration of the harvesting system [2].…”