Energy harvester

Abstract

The invention discloses an energy harvester which comprises a housing, a vibrating reed, a magnet block, a first friction layer and a second friction layer; a coil winds the outside wall of the housing of the energy harvester with a preset number of turns; an opening is formed in the upper end of the housing of the energy harvester; the vibrating reed is provided with a vibrating part responding to external vibration; the vibrating reed covers the opening in the upper end of the housing, and fixedly connected with the housing; the magnet block is positioned inside the housing, and connected with the vibrating reed; the first friction layer is positioned at the lower end of the magnet block, and fixedly connected with the magnet block; the second friction layer is arranged on the inner bottom surface of the housing; the second friction layer and the first friction layer are oppositely arranged according to the preset collision interval. Two energy harvesting ways of friction and electromagnetism are adopted for harvesting energy synchronously, so that the energy output density of the energy harvester is improved, and the efficient energy harvesting and outputting are achieved in a low-frequency vibration environment.

Description

Technical field [0001] The present invention relates to the field of energy harvesting, in particular to an energy harvester. Background technique [0002] Vibration energy is a kind of energy widely present in the environment. Collecting environmental vibration energy to supply power to wireless sensor nodes and electronic devices is a simple and environmentally friendly power supply method with broad application prospects. [0003] Most of the mechanical vibrations in the natural environment are in the state of low frequency vibration, and the frequency is generally lower than 50 Hz or even smaller. In order to improve the efficiency of energy harvesting, the natural frequency of the vibration-type energy harvester needs to match the frequency of the vibration source in the environment. At the same time, the energy harvester is also required to have a wider working frequency band to adapt to the random change of the vibration source frequency. At present, most of the existing v...

AI Technical Summary

Problems solved by technology

At present, most of the existing vibration energy harvesters are designed with high natural frequency to obtain high-density energy output, and a few energy harvesters that work in low-frequency environments have low output power.

And a single fixed operating frequency also limits the scope of use of energy harvesters

Existing composite energy harvesters mainly rely on human pressure to work, such as pressing human limbs, etc., which are not suitable for environmental vibration conditions with variable external frequencies, and the power output is low

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