Research Based Loosely Coupled System Resonance Coil Magnetic Resonance Four Wireless Energy Transfer System

In recent years, the loose coupling resonant magnetic resonance wireless energy transmission technology have gotten more and more attention of scholars both at home and abroad, this technology uses the non-radiative near-field loose coupling to transmit wireless energy through oscillators that have the same eigen frequency. To compare with the magnetic coupling transmission mode, the resonant magnetic resonance wireless energy transmission technology advantage is making the energy transmission distance longer, the output power and transmission efficiency can keep being superior when the distance is dozens or even hundreds of cm.Basing on the principle of resonance coupling wireless power supply, in order to explore the four coil system of resonant magnetic resonance, this paper investigates the four coil system model of magnetic coupling resonant WPT based on the loose coupling, this simple model has fixed transmitting coil and repeating coil one,repeating coil two and receiving coil, it does research on magnetic resonance wireless transmission technology by changing the distance between the two repeating coils.The design has done the following several aspects of research work mainly:1. This paper references to existing research results at home and abroad, uses inductively coupled circuit to analysis of radio transmission mechanism, has deduced the formula of energy transfer efficiency, gotten its transmission power of expression.2. This paper introduces the principle of WPT and makes a detailed analysis and derivation of two coils and the equivalent model of four coil, gets the transmission power of expression.3. According to the efficient, high-resolution, single frequency spectrum characteristics of the external input source for four coil system, the high-frequency power supply scheme is proposed.4. Based on the theoretical description and structural analysis of four coil system,thefour-coil model and schematics are designed by ANSOFT MAXWAELL. On the basis of main structure, the four-coil eddy current and detailed design data are given.And the data under ideal circumstances is obtained by simulation.Finally, this paper makes the detailed analysis, makes of each section of four coil system from the external power supply to the load at the receiving end, and makes a summary, points out its shortages and gets a clear perspective of the improvement of the system.This paper has the following innovations and refinements:1. Design an efficient broadband power amplifier suppressed by second harmonics.2. Using Ansoft Maxwell software to build a loosely coupled model WPT four coil system, and have gotten the design scheme.