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Piezoelectric-electromagnetic composite low-frequency broadband energy harvester

A composite energy harvester technology, which is applied to piezoelectric effect/electrostrictive or magnetostrictive motors, generators/motors, electrical components, etc., can solve the problems of poor environmental adaptability, narrow frequency band of energy harvesters, Fixed vibration frequency and other issues to achieve the effect of improving environmental adaptability and broadening energy harvesting bandwidth

Active Publication Date: 2015-08-12
BEIJING INSTITUTE OF TECHNOLOGYGY
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Problems solved by technology

[0004] The purpose of the present invention is to provide a piezoelectric-electromagnetic composite low-frequency broadband energy harvester to solve the problems of narrow frequency band, fixed vibration frequency and poor environmental adaptability in existing energy harvesters

Method used

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  • Piezoelectric-electromagnetic composite low-frequency broadband energy harvester
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  • Piezoelectric-electromagnetic composite low-frequency broadband energy harvester

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Embodiment 1

[0028] A piezoelectric-electromagnetic composite low-frequency broadband energy harvester, comprising a piezoelectric energy harvesting device, an outer frame 1 of the electromagnetic energy harvesting device, electrodes 3, and a base 5; the piezoelectric energy harvesting device includes a piezoelectric bimorph 2, a cantilever beam 4; The electromagnetic energy harvesting device includes a permanent magnet 6, an induction coil 7 and magnets 8 on both sides, such as figure 2 , 3 shown.

[0029] The piezoelectric bimorph 2 is fixed on the upper and lower surfaces of the cantilever beam 4 by pasting; it vibrates with the cantilever beam 4 at the same time, and the charges generated during the vibration process are drawn out to the energy conversion circuit through the electrode 3 connecting wires for processing; one end of the cantilever beam 4 is tightly fixed on the On the base 5 of the vibrating body, the other end is pasted as a rectangular permanent magnet 6 as a mass to ...

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Abstract

The invention relates to a piezoelectric-electromagnetic composite low-frequency broadband energy harvester, and belongs to the technical field of new energy and power generation. The piezoelectric-electromagnetic composite low-frequency broadband energy harvester is characterized in that piezoelectric bimorphs are fixed at the upper surface and the lower surface of a cantilever beam; the surfaces of the piezoelectric bimorphs are coated with silver; one end of the cantilever beam is fixed on a base of a vibration body, and the other end is pasted with a permanent magnet; two sides of the permanent magnet are provided with induction coils respectively; and two side magnets are placed behind the two induction coils respectively. According to the invention, the environment adaptability and the energy harvesting efficiency of the energy harvester are improved; and the energy harvesting bandwidth can be effectively expanded. The piezoelectric-electromagnetic composite low-frequency broadband energy harvester harvests energy under vibration conditions by using a piezoelectric effect and an electromagnetic effect, can generate large current and high voltage, effectively makes up defects of a piezoelectric or electromagnetic independent energy harvesting mode, can achieve simultaneous output of high voltage and high current by using an effective energy conversion circuit, and is more conducive to charging a rechargeable battery or a super-capacitor.

Description

technical field [0001] The invention relates to a piezoelectric-electromagnetic composite low-frequency broadband energy harvester, which belongs to the technical field of new energy and power generation. Background technique [0002] At present, with the rapid development of modern integrated circuit technology and micro-electromechanical system (MEMS) technology, various micro-electromechanical devices or systems and low-power electronic products are increasingly applied to aerospace, weapon industry, biomedicine, structural health monitoring and other fields. At present, chemical batteries are still used to power these systems or devices, but there are more prominent problems in using chemical batteries: they are heavy and bulky, and cannot be used in systems with small working spaces; Recharging or replacement; greater pollution to the environment. These have become unfavorable factors for the further application of MEMS and low-power electronics. Therefore, a new pow...

Claims

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Application Information

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IPC IPC(8): H02N2/18H02K35/02
Inventor 刘海鹏高世桥张广义武丽森李平
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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