Piezoelectric vibration energy collector

Abstract

The invention discloses a piezoelectric vibration energy collector which comprises a piezoelectric cantilever beam and mass blocks. The piezoelectric cantilever beam comprises a first main beam, a second main beam and a conduction plate, and the first beam and the second beam are connected via the conduction plate and arranged in symmetry by taking the conduction plate as the center; the shape ofthe first main beam is the same with that of the second main beam, each of the first and second main beams comprises an oscillation starting plate and a homocentric-square structure, the number of themass blocks match that of the oscillation starting plates, and the mass blocks are arranged on the oscillation starting plates; one end of each homocentric-square structure is connected to the corresponding oscillation starting plate, and the other end of the homocentric-square structure is connected to one end of the conduction plat; and a homocentric-square channel without an internal slit is formed between the homocentric-square structure and the oscillation starting plates. The piezoelectric vibration energy collector can occupy the effective area of the piezoelectric cantilever beam maximally, and thus, improve the power generation area of the piezoelectric cantilever beam, a higher output voltage can be generated, the resonance frequency is lower, the bandwidth is higher, and the collector can match the vibration frequency of the human body well and suitable for collecting vibration energy of the human body.

Description

Technical field [0001] The invention relates to the field of vibration energy harvesting, in particular to a piezoelectric vibration energy harvester. Background technique [0002] In recent years, domestic and foreign scholars have made great progress in the field of vibration energy harvesting. They have designed miniaturized harvesting devices and widely used in real life. Vibration energy harvesters are one of them, which can rely on the vibration energy of the human body. , So as to supply power to external devices such as wireless sensor network nodes, embedded sensors or microelectronics; some vibration energy harvesters are realized by piezoelectric materials, specifically piezoelectric plates or piezoelectric beams are used. The structure is diverse. For example, the Chinese patent application number 201610821858.3 discloses a vibration energy harvester, but there are some gaps or grooves inside, which means that the overall design takes up unreasonable space. If these g...

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Problems solved by technology

[0002] In recent years, scholars at home and abroad have made great progress in the field of vibration energy harvesting. They have designed miniaturized harvesting devices and widely used them in real life. The vibration energy harvester is one of them, which can rely on the vibration energy of the human body. , so as to supply power for external devices such as wireless sensor network nodes, embedded sensors or microelectronic products; some vibration energy harvesters are realized by piezoelectric materials, specifically piezoelectric plates or piezoelectric beams, which There are various structures. For example, the Chinese patent application number 201610821858.3 discloses a vibration energy harvester, but there are some gaps or grooves inside, that is, the space occupied in the overall design is unreasonable. If these gaps or grooves can be used If the piezoelectric material is used for filling instead, the output of the piezoelectric plate will be greatly improved.

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