An Analysis Method for Metamaterial Equivalent Circuits for Wireless Power Transfer Systems

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 invention belongs to the field of new electrical technology, and more specifically relates to an analysis method for a metamaterial equivalent circuit used in a wireless power transmission system. Background technique [0002] The traditional power supply and charging methods are all connected by wires. This charging method is not convenient enough, and it also brings many safety hazards, such as the aging of the insulation 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, but because the far-field radiation has no directionality 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 propert...

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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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