Study On Wireless Power Transmission System Based On Coupled Magnetic Resonance

The technique of wireless power on coupled magnetic resonance provides a new method forenergy transmission, which is utilizing the coupled magnetic resonance to realize the wirelesspower transmission. Comparing with the traditional wired transmission for energy, the wirelesspower transmission avoids unsafe factors,electrical wires exposed, wear, spark and so on,whichgenerated during electrical equipments obtaining energy mainly through conducting wires;Comparing with other technologies in wireless power transmission, the wireless powertransmission technology based on coupled magnetic resonance has more prominentcharacteristics with higher transmission efficiency, higher transmitted power, longertransmission distance, no direction and so on. More important, the wireless power transmissionprovides more convenient power in special areas: underwater testing, oil fields and mines,mountains and forests, chemical industries and others. Therefore, this technology possesses goodresearch significances and application of values.The theses has established the general framework, equivalent circuit model, and hasrevealed the transmission characteristics, the innate principles of the wireless power supplysystem through researches on basic principles and transmission mechanism in wireless energytransfer technology.In the analysis of influencing factors of wireless power supply based on coupled magneticresonance, this paper has studied on relationships between compensation structures of coupledmagnetic resonant circuits, quality factors, resonance frequency, resonance coils, compensationcapacitors and energy transmission efficiency, energy output power, transmissiondistance,primarily via formula derivation and MATLAB simulation. And this paper has alsostudied an effective way to improve the transmission efficiency, output power and transmissiondistance through improving mutual coil parameters,(such as increasing coil radius, turns,diameter); choosing a reasonable compensation structure of coupled magnetic resonant circuitsaccording to the actual experiment; appropriately increasing resonant frequency, quality factor,and so on.This paper has presented the design methods and procedures of each individual componentin wireless power transfer devices based on coupled magnetic resonance. This transfer devicemainly consists of sections of the high-frequency inverter (HF-Inverter), transmit coil, receiver coil, the compensation capacitor, the regulator and load. Of which, the paper has described theoperating principles and selections of half-bridge driver circuits and switch transistors in details.And the experimental results have verified the effective design for resonant coils andcompensation capacitor.At last, through three sets of experiments have come to conclusions that:1, the relationshipsamong the transmission distance, transmit power-received power-transmission efficiency;2,the relationships among the input voltage of transmitter-transmit power-received power-thetransmission efficiency;3,the relationships among the driving frequency-transmitpower-received power-the transmission efficiency, which have attested researches onexperiments and theories reasonably in this paper.