Research On The Network Structure And Related Circuit Of Wireless Power Transfer Based On Magnetically-coupled Resonant

Wireless power transfer(WPT) technology, known as "the eight kind of the revolutionary technology changing the future world", represents a significant shift in the technology industry, and the equipment supported wireless power transmission technology will become more and more popular. Especially, Magnetically-coupled resonant wireless power transfer(MCR-WPT) technology has been the attention of the majority of researchers since the research team leader Professor Marin Soljacic put forward the technology at Massachusetts Institute of Technology(MIT).The main content of this paper is to study the system structure and circuit based on MCR-WPT technology, which mainly include the following contents:(1) Three analysis theories of Magnetically-coupled resonant wireless power transfer system are introduced—coupled mode theory, filter theory and circuit theory. Introduction and description of the coil characteristics in the system, and the simulation analysis of its relationship with the transmission distance, transmission power and transmission are also given in this paper.(2) The wireless power transmission system of single relay and single load, linear Domino relay system and multi load system are studied according to the circuit theory. And in order to realize wireless power covering a large area, the paper puts forward a new type of network structure of WPT system.(3) Through the analysis of the effect of four kinds of transmission structure on the performance of the system, compare with performance evaluation methods of other researchers proposed, we put forward a new method of efficacy coefficient method to evaluate the performance of four kinds of classical transmission structure.(4) In the MCR-WPT system, there is cross coupling between non-adjacent coils, which may seriously impact the performance of the system. A method to insert additional reactance in the loop to eliminate the adverse effects of the cross coupling effect is introdued according to the two kinds of circuit model.(5) The circuit of MRC-WPT system has been studied and analyzed. The WPT system with new network structure is built and its circuit is verificated in fact, finally, which charge successfully for different positions of load in the experiment.