an energy harvester

Abstract

The invention discloses an energy harvester, comprising: an energy harvester shell, a coil with a preset number of turns wound on the outer wall of the energy harvester shell, an opening is arranged at the upper end of the energy harvester shell; a vibrating plate, The vibrating plate is provided with a vibrating part that responds to external vibrations. The vibrating plate covers the opening at the upper end of the energy harvester shell, and the vibrating plate is fixedly connected to the energy harvester shell; the magnet block is located inside the energy harvester shell, and the magnet block Connected with the vibrating plate; the first friction layer, the first friction layer is located at the lower end of the magnet block, and the first friction layer is fixedly connected with the magnet block; the second friction layer, the second friction layer is arranged on the inner bottom surface of the energy harvester housing Above, the second friction layer is arranged opposite to the first friction layer according to a preset collision distance. The two energy harvesting methods of friction and electromagnetic work at the same time, which improves the energy output density of the device and realizes efficient energy harvesting and output in a low-frequency vibration environment.

Description

technical field [0001] The invention relates to the field of energy harvesting, in particular to an energy harvester. Background technique [0002] Vibration energy is a kind of energy that exists widely in the environment. Harvesting environmental vibration energy to power wireless sensor nodes and electronic devices is a simple and environmentally friendly power supply method with broad application prospects. [0003] Most of the mechanical vibration in the natural environment is in the state of low frequency vibration, and its frequency is generally lower than 50Hz, or even smaller. In order to improve energy harvesting efficiency, the natural frequency of the vibratory energy harvester needs to match the frequency of the vibration source in the environment, and the energy harvester is also required to have a wide operating frequency band to adapt to random changes in the frequency of the vibration source. At present, most of the existing vibration energy harvesters are...

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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