Magnetic resonance wireless charging system and method

Abstract

The invention relates to a magnetic resonance wireless charging method which is used for wirelessly charging a load. One end connected with the load is used as a receiving end, and one end connected with a power supply is used as a transmitting end. The wireless charging method comprises the steps that resonance coils are arranged at the transmitting end and the receiving end, and the intrinsic frequencies of the resonance coils are the same; the resonance coils of the transmitting end and the receiving end are coupled to realize wireless power transmission; the input power of the transmittingend and the output power of the receiving end are monitored after the wireless electric energy transmission is started; and according to the ratio of the output power to the input power, the energy gain rate of the transmitting end and / or the energy loss rate of the receiving end, the ratio of the output power to the input power falls into a set range, and wireless power transmission is kept in an orthogonal mode range. The orthogonal mode is tracked in the wireless power transmission process, so that the range of high-efficiency transmission is greatly increased, and the method has the characteristics of single frequency and high efficiency, and also has high stability and safety.

Description

technical field [0001] The invention relates to the field of wireless energy transmission, in particular to a magnetic resonance wireless charging system and method. Background technique [0002] In recent years, with the development of science and technology, wireless power transfer technology has gained great attention in both academic and engineering fields. Due to its convenience, the 110kHz to 210kHz inductive wireless power transfer scheme has been widely used in consumer electronics products such as mobile phones and earphones. However, the disadvantage of inductive wireless power transfer technology is that it cannot provide charging distance, and its transmission distance is usually less than 10mm. In 2007, Professor Marin of the Massachusetts Institute of Technology proposed for the first time the resonant wireless power transfer technology (Science 317,83-86 2007), that is, two coils with the same frequency are used at the transmitting end and the receiving end o...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the defects of the prior art, provide a magnetic resonance wireless charging system and method, and solve the problem of frequency splitting caused by mode coupling in the existing resonant wireless power transmission scheme, the reduction of transmission efficiency and the system of tracking frequency scheme Problems with poor stability and the need for strictly symmetric systems, etc.

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