Electret based mems electric field energy harvester

Abstract

The invention belongs to the technical field of energy collection, in particular to an MEMS electric field energy collector based on an electret. The MEMS electric field energy collector based on the electret is mainly used for collecting energy of an alternating-current electric field in a space. The MEMS electric field energy collector based on the electret comprises an insulating substrate, a piezoelectric wire, a supporting surface and the electret, wherein the piezoelectric wire is arranged above the insulating substrate in parallel, an electrostatic field composed of the electret adhering to the supporting surface provides appropriate bias for the piezoelectric wire located in the electrostatic field, sensitivity of the piezoelectric wire biased by the electrostatic field to an external electric field is greatly improved, when the piezoelectric wire vibrates due to excitation of the external electric field, a piezoelectric material carries out stress-strain due to stretching or shrinkage so that internal electric charges flow to form electrical signals, and mechanical energy can be converted into electric energy; electric field energy is collected through an external circuit connected with the piezoelectric wire. The MEMS electric field energy collector based on the electret is manufactured through the MEMS micromachining technology, electric field energy in a space is used creatively, and the collector is small in size, convenient to carry and low in cost.

Description

technical field [0001] The invention belongs to the technical field of energy collection and utilization, in particular to an electret-based MEMS electric field energy collector. Background technique [0002] The operating state of the high-voltage transmission line directly determines the safety and efficiency of the power grid operation, and the real-time monitoring of its operating state is generally through the installation of fault detection nodes. Fault detection nodes are usually suspended on overhead high-voltage lines, and it is very difficult to supply power to the detection nodes in conventional ways. At present, the following solutions include: 1) battery, which is not affected by the surrounding environment by using battery power supply, but the battery life is limited and needs to be replaced frequently; 2) solar battery, solar battery is a good way, but it is affected by the environment 3) High-voltage current induction power supply, this method relies on the...

AI Technical Summary

Problems solved by technology

Fault detection nodes are usually suspended on overhead high-voltage lines, and there will be great difficulties in using conventional methods to supply power to detection nodes

At present, the following solutions include: 1) battery, which is not affected by the surrounding environment by using battery power supply, but the battery life is limited and needs to be replaced frequently; 2) solar battery, solar battery is a good way, but it is affected by the environment 3) High-voltage current induction power supply, this method relies on the magnetic circuit of the alternating current in the high-voltage line to pass through the coil to induce energy, the principle is similar to a transformer; the disadvantage is that the current intensity in the high-voltage line varies with the user's use The power situation will change greatly, resulting in very unstable energy supply, and even the possibility of power outages

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