Study On Wireless Power Transmission Structure With Uniform Magnetic Field On Magnetic Resonance Coupling

Wireless power transmission, as the word suggest that is the way of energythrough wireless transmission. In recent years, the technology has received not onlywide attention by the people, but also be called as "eight revolutionary technology forthe future of the world" by the media. The birth of the technology not only changespeople’s production and daily life, but also represents the important milestone ofhuman science and technology progress. Magnetic coupling resonance technique hasthe incomparable advantages and broad application prospect, it also has high researchvalue and application value.In this paper, the main research is study on Wireless Power Transmissionstructure with uniform magnetic field on magnetic resonance coupling mainlyincluding the following content.Firstly, the coupled-mode theory and circuit theory briefly that is applied in thefield of research methods are introducing, and then based on the traditional two coilmodel to analyze the equivalent circuit and get the best coupling conditions. Whenthe transmission distance become to change, then we can’t satisfy the best transportconditions. So the insufficiency of the traditional two coils need to improved, usingHelmholtz coils on wireless energy transmission can establish uniform magnetic fieldin a certain range. In the certain space range mobile load receiving power tends to bestable, the structure is given to the limit parameters of wireless energy transmissionand transmission power and transmission efficiency. Later research find that theHelmholtz coils can be further modified, to use the modified three coil model onwireless energy transmission, the numerical simulation and experimental validationcontrast the conclusion that the model structure can obtain uniformity of magneticfield in a larger scope, makes the mobile load to receive power tend to stable in abroader range.In view of two kinds of basic coil structure, innovative development are putforward the series model coil structure and increase the relay of the Helmholtz coilsstructure to expand the magnetic field homogeneity range, and it also satisfies therequirements of multiple loads for wireless charging at the same time.