Wireless electric energy transmission apparatus based on two-pole-plate structure using capacitance coupling

Abstract

The invention relates to a wireless electric energy transmission apparatus based on a two-pole-plate structure using capacitance coupling. Through analysis of advantages and disadvantages of a conventional typical capacitance power transmission circuit model, a novel capacitance power transmission circuit model is designed based thereon, and a pair of pole plate capacitors and two grounds are additionally arranged. When a high-frequency oscillation system is at a resonant state, high-frequency voltages are generated at connecting positions between capacitors and inductors, if the high-frequency voltages are connected with the pole plate capacitors, induction currents are generated, and thus transmission of capacitance between the pole plate capacitors is realized. According to the invention, compared to inductance power transmission, the apparatus has the advantages of simple structure, slow attenuation of efficiency along with distance prolongation and the like; and compared to a conventional capacitance power transmission structure, the apparatus has the advantages of reducing the work frequency under the condition of long-distance power transmission, being quite high in transmission efficiency and the like. The apparatus well solves the restriction of inductance power transmission on surrounding environment requirements and is more suitable for application in such conditions as high metal contents and the like in a surrounding environment, such as wireless energy transmission of different potential on a high-voltage line.

Description

technical field [0001] The invention relates to high-frequency resonant high-voltage electric field coupling wireless power transmission technology, in particular to a wireless power transmission device based on a bipolar plate structure utilizing capacitive coupling. Background technique [0002] Inductive Power Transfer Technology (IPT) has been widely applied to electric vehicles and mobile terminal equipment, and its transmission efficiency is already comparable to that of traditional wired power transmission. However, the disadvantage of inductive power transmission is that it depends on the conductor medium. When the concentration of metal substances in the air is high, the magnetic field will generate a current vortex, causing energy loss and increasing the temperature, which is very dangerous. Capacitive transmission is a good solution to this problem. [0003] Capacitive power transfer uses an electric field instead of a magnetic field to transfer electrical energy...

AI Technical Summary

Problems solved by technology

Capacitive power transmission only uses metal plates, which have the advantages of good conductivity, low price, and light weight; while the coils for inductive power transmission must be wound with Litz wire, which is relatively expensive, which is very unfavorable for wireless power transmission the popularity of

However, the typical capacitive power transmission circuit has the following two disadvantages (such as figure 1 ): As the transmission distance increases, the coupling capacitance value becomes very small, which makes the system resonance frequency increase seriously; and at very high frequencies, the high-frequency power supply required by the system is difficult to manufacture, and the high-frequency resistance increases sharply. leading to a sharp decline in the overall efficiency of the system

Therefore, the wireless power transmission system based on the traditional capacitive transfer model is difficult to achieve long-distance power transmission

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