A Multi-stable Piezoelectric Energy Harvester

Abstract

The invention discloses a piezoelectric energy harvester based on a multi-stable state, which comprises a main piezoelectric beam, a curved piezoelectric beam and a spring, wherein first piezoelectricsheets are symmetrically adhered on the upper and lower surfaces of the main piezoelectric beam; first vibration magnets are symmetrically arranged on the upper and lower surfaces of one end of the main piezoelectric beam pointing to a bending portion of the curved piezoelectric beam and the other end thereof is overlapped at the top end of a spring; two first vibration magnets are arranged withthe opposite surfaces in a heteropolar attraction state; a second piezoelectric sheet is adhered on the curved inner side surface of the curved piezoelectric beam; second vibration magnets are symmetrically arranged on two tail end inner side surface of the curved piezoelectric beam; third piezoelectric sheets are symmetrically adhered on the two tail end outer side surfaces; the second vibrationmagnet and the first vibration magnet on a certain side of the main piezoelectric beam are arranged with the opposite surfaces in a homopolar repulsion state; and the second vibration magnet and the first vibration magnet on the other side of the main piezoelectric beam are arranged with the opposite surfaces in a heteropolar attraction state. According to the piezoelectric energy harvester basedon a multi-stable state in the invention, the power generation efficiency is significantly increased through a design of the multi-stable state and the application of the curved piezoelectric beam.

Description

technical field [0001] The invention relates to the fields of energy-saving technology and renewable environmental protection new energy technology, in particular to a piezoelectric energy harvester based on a multi-stable state, which can effectively collect random vibration mechanical energy in the surrounding environment for power generation. Background technique [0002] Currently, most low-power devices (such as wireless sensors and transmitters, medical implant sensors, and portable electronic devices) rely on electrochemical batteries for power. However, electrochemical batteries have problems such as short life, high cost, and environmental pollution caused by disposal of waste batteries, so researchers are actively looking for a new energy source to replace electrochemical batteries for powering low-power devices. [0003] In addition, the continuous development of microelectronics technology has greatly reduced the energy consumption of low-power devices, so it has...

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Problems solved by technology

[0004] However, the existing piezoelectric vibration power generation device has the defects of poor environmental adaptability, low power generation efficiency, poor low frequency adaptability, and small power generation per unit time.

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