Vibration pick-up structure on basis of flexible main beam for vibration energy harvester

Abstract

The invention discloses a vibration pick-up structure on the basis of a flexible main beam for a vibration energy harvester. The vibration pick-up structure comprises the flexible main beam, a plurality of piezoelectric cantilever beams and mass blocks. The flexible main beam is of a rectangular frame structure, and a rectangular hole is formed in the middle of the flexible main beam; one end of each cantilever beam is fixedly adhered on the upper surface of the flexible main beam, the other end of each piezoelectric cantilever bream is suspended above the rectangular hole, and each mass block is adhered at the suspended end of the corresponding piezoelectric cantilever beam; the multiple piezoelectric cantilever beams are respectively arranged on two sides of the rectangular holes to form forking fingers and are parallel and equidistant to short sides of the rectangular hole. By the aid of the forking finger type multi-cantilever-beam vibration pick-up structure on the basis of the flexible main beam in the design, high-order vibration pick-up frequencies and of a system can be greatly reduced, low-order vibration pick-up frequencies of the system can be reduced, and accordingly a vibration energy harvesting frequency band of the system can be effectively broadened. Compared with the traditional vibration pick-up structure of a vibration energy harvester, the vibration pick-up structure has the advantages that broadband vibration energy can be harvested in ultra-low frequency ranges of frequencies lower than 100Hz, output voltage can be increased, and accordingly the energy harvesting efficiency can be improved.

Description

technical field [0001] The invention relates to a device in the technical field of micro-electromechanical systems, in particular to a vibration-picking structure of a vibration energy harvester. Background technique [0002] Portable electronic devices and wireless sensor networks have developed rapidly in the past few decades, especially in human health detection systems, environmental control systems, embedded systems, military security application systems, and wild animal tracking devices. . Usually, the above-mentioned devices rely on traditional chemical batteries to provide energy, but traditional chemical batteries have many disadvantages as energy supply methods, such as large volume, high quality, limited energy supply life, need for regular replacement, and pollute the environment. Therefore, in order to obtain an autonomous power supply system with a long-term or even infinite life cycle, researchers at home and abroad collect energy from the surrounding environ...

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Problems solved by technology

[0006] The technical problem to be solved by the present invention is to provide a low-frequency, broadband vibration energy harvester vibration pickup structure based on a flexible main bea

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