Multi-mechanism composite broadband vibration energy harvester

Abstract

The invention discloses a multi-mechanism combined type broadband vibration energy harvester. The device comprises a first vibration beam, a second vibration beam, a high-frequency piezoelectric composite beam, a first moving magnet, a second moving magnet and a coil, the first vibration beam is fixedly connected with the first movable magnet and drives the first movable magnet to vibrate under vibration excitation; the second vibration beam is fixedly connected with the second movable magnet and drives the second movable magnet to vibrate under vibration excitation; the first vibration beam and the second vibration beam are arranged in a split mode. Electric energy can be output between the first movable magnet and the coil through electromagnetic induction, and the first movable magnet and the second movable magnet can be driven by the first vibration beam and the second vibration beam to touch the high-frequency piezoelectric composite beam and output the electric energy according to the piezoelectric effect of touching the high-frequency piezoelectric composite beam. The broadband vibration energy harvester provided by the invention has a low-frequency broadband energy harvesting effect, and can output relatively high voltage and relatively high current and a wider optimal load application range at the same time.

Description

technical field [0001] The invention belongs to the technical field of energy harvesting, in particular to a multi-mechanism composite broadband vibration 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. [0003] Energy harvesting technology realizes the conversion of vibr...

AI Technical Summary

Problems solved by technology

The three types of energy harvesters have their own different characteristics. The output voltage of the piezoelectric energy harvester is relatively large, but the large internal resistance results in a small output current, usually only a few microamperes to tens of microamperes. The best load generally reaches tens of kΩ to 1MΩ; the output current of the electromagnetic energy harvester is relatively large, but the output voltage is only tens to hundreds of millivolts, and the best load is usually tens to hundreds of ohms; the electrostatic energy harvester Electret or turn-on voltage is required to work normally, and there is also the problem of small output current

Therefore, the vibration energy harvester needs to solve the problem of small output power in the low frequency working environment

Images