Comb energy harvester converting continuous displacement to impact load

Abstract

The invention discloses a comb energy harvester converting continuous displacement to impact load, which comprises a long comb and a short comb, wherein the long comb is a power generating element; the long comb is connected and arranged inside an insulated shell via a rail; the upper end of the insulated shell is provided with an insulated top cover; a through hole is arranged in the insulated top cover; a connection rod of the short comb passes through the through hole; when the short comb moves vertically, tooth tips of the long comb and the short comb collide mutually, the upper surface and the lower surface of the teeth of the long comb are coated with electrodes, the electrodes are connected with the input end of a conditioning circuit, and the output end of the conditioning circuit is connected with an energy storage module; and when the short comb moves vertically to generate continuous displacement, tooth tips of the long comb and the short comb collide mutually, a stress field exists inside teeth of the long comb due to effects of the impact load, polarization charges are thus generated, the polarization charges are transferred to the conditioning circuit via the electrodes, the charges are further stored in the energy storage module for being used by an energy consumption element. The sensor of the invention has the feature of converting continuous displacement to impact load, the power generating ability has designability, and the energy harvesting ability is greatly improved.

Description

technical field [0001] The invention relates to the field of piezoelectric energy harvesting, in particular to a comb energy harvester for converting continuous displacement into impact load. Background technique [0002] Most of the traditional piezoelectric energy harvesting devices use piezoelectric single crystals and piezoelectric bimorphs, mainly based on d33 and d31 working modes. By changing the properties of piezoelectric materials and changing the working mode of piezoelectric units, multi-layering can be used to increase The effective volume of the piezoelectric body, changing the structural form of the piezoelectric vibrator and adjusting the resonant frequency of the system can change the form of the piezoelectric energy harvesting device to improve the energy harvesting performance of the piezoelectric energy harvesting device. In the working environment, the piezoelectric energy harvesting device uses the ubiquitous noise and vibration in the environment to ca...

AI Technical Summary

Problems solved by technology

[0003] Existing piezoelectric energy harvesting devices based on piezoelectric materials are mainly used for small vibrations when they harvest energy in the environment, and cannot convert continuous displacement into impact loads for energy capture, and the efficiency of energy capture is very limited

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