Analysis method of metamaterial equivalent circuit for wireless electric energy transmission system

Abstract

The invention discloses an analysis method of a metamaterial equivalent circuit for a wireless electric energy transmission system. The method comprises: each metamaterial unit is equivalent to an RLCresonance circuit including a resonance coil, an additional capacitor and a dielectric substrate; the RLC resonance circuits are adjusted and thus when the resonant frequency of each metamaterial unit is the operating frequency of the system, the equivalent magnetic permeability is -1; the N metamaterial units are arranged and combined according to the periodic structure of the array to obtain ametamaterial; the metamaterial is loaded between a transmitting coil and a receiving coil and mutual inductance values between the modules are calculated; a circuit matrix equation of the system is established to solve circuit parameters, and then the transmission efficiency of the system is calculated; and then the distance between the metamaterial and the transmitting coil is changed to obtain an optimal intervention position. Therefore, the acting rule and coupling mechanism of metamaterial loading to the wireless electric energy transmission system are analyzed deeply and accurately; and the analysis process is simplified.

Description

Technical field [0001] The present invention belongs to the new technical field of electrical engineering, and more specifically, relates to a metamaterial equivalent circuit analysis method used in a wireless power transmission system. Background technique [0002] The traditional power supply and its charging method are all connected by wire. This charging method is not convenient and brings many safety hazards, such as the insulation aging problem of the power cord. The wireless power transmission system does not have the above problems, so it has been widely used. In the wireless power transmission system, electric energy can be transmitted through far-field radiation or near-field coupling. However, because the far-field radiation has no directivity and the distance is long, the transmission efficiency is very low, which greatly restricts the development of wireless power transmission. Electromagnetic metamaterials are artificial composite materials with physical properties...

AI Technical Summary

Problems solved by technology

[0003] The existing methods for studying wireless power systems loaded with metamaterials are usually equivalent medium theory and transmission line theory. These methods ignore the metal coupling effect on both sides of the medium, and can only be roughly analyzed by finite element simulation software. To provide the principle of setting the basic parameters of the required metamaterials, it is necessary to establish a relatively complex geometric model, and the calculation speed is slow, so it cannot efficiently guide the acquisition of metamaterial parameters and the processing and manufacturing of metamaterials. The equivalent circuit method is better than other methods. The two methods are simpler, more flexible, and more efficient

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