Non-linear piezoelectric/electromagnetic composite broadband energy harvester

Abstract

The invention discloses a non-linear piezoelectric / electromagnetic composite broadband energy harvester. The non-linear piezoelectric / electromagnetic composite broadband energy harvester comprises a low-frequency piezoelectric composite beam, a high-frequency piezoelectric composite beam, a movable magnet, a static magnet and a coil, wherein one end of the low-frequency piezoelectric composite beam is connected with one end of the movable magnet in series, the high-frequency piezoelectric composite beam is located above the low-frequency piezoelectric composite beam and the movable magnet; the coil is located below the movable magnet; the static magnet is fixed at one side of another end of the movable magnet, and the static magnet and the other end of the movable magnet are arranged in parallel. The non-linear piezoelectric / electromagnetic composite broadband energy harvester disclosed by the invention has the advantages that the low-frequency piezoelectric composite beam, the high-frequency piezoelectric composite beam and the coil are simultaneously integrated on the same structure to realize the piezoelectric-electromagnetic composite energy harvesting; the energy harvester can simultaneously output the large voltage and current, and broadens the optimal load application range. The energy harvesting of the low-frequency piezoelectric composite beam, the high-frequency piezoelectric composite beam and the coil in the broadband range can be realized through the non-linear magnetic effect between the movable magnet and the static magnet.

Description

technical field [0001] The invention relates to the technical field of nonlinear piezoelectric-electromagnetic composite energy harvesters, in particular to a nonlinear piezoelectric-electromagnetic composite broadband energy harvester. Background technique [0002] With the development of microsystem technology, the application fields and scope of various microdevices are becoming more and more extensive, especially in the application environment of airtight, rotating and relatively limited space size, due to the limitation of system size and the limited Due to the poor adaptability of the line energy supply environment and other problems, the traditional energy supply method cannot meet the new energy supply requirements integrated with micro-devices. Therefore, energy harvesting technology that can work for a long time, occupy a small working space, and has strong environmental adaptability has become a research hotspot in the field of micro-energy in recent years. [00...

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Problems solved by technology

[0005] In view of the above-mentioned analysis, the present invention aims to provide a nonlinear piezoelectric-electromagnetic composite broadband energy harvester to solve the problem of output vibration caused by low operating frequency when the vibration energy harvester in the prior art is applied in a low-frequency vibration environment. Small energy and narrow energy capture frequency band, uneven output voltage and current, and small load application range

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