Larger Electric Power Wireless Transfer Technology Research For Household Appliances

In recent years, wireless power transmission technology has a rapiddevelopment in medical, electric vehicle and many other areas. A lot of actualproducts and applications based on wireless power transmission have beendeveloped. Magnetic resonance wireless power transmission technology isoriginated in2006, although its development time is not long, its advantages of longdistance transmission in middle power transmission level can be proved whencompares with other wireless power transmission technologies.This paper is based on the magnetic resonance wireless power transmissiontechnology, with this technology we developed a wireless power transmissiondevice for the household appliances. With the advantage of the wireless powertransmission technology, the disadvantage and potential safety hazard that the wirehas in the humid environment such as the kitchen can be eliminated. Therefore, theresearch in this paper has certain value in practical application.Firstly, the paper analyzed the basic principle of the resonance wireless powertransmission technology. With the circuit coupling theory, the paper analyzed thewhole transmission system. Based on the knowledge above, the paper also analyzedthe relationship between the main parameters of the coupling coil, the load, thefrequency and the transmission characteristics by theory and simulation. Therefore,determine the structure and basic parameters of the system qualitatively.Secondly, the paper designed the coupling coils, the inverter circuit and thecontrol circuit according to the given requirements. Also, the paper compared andanalyzed the main parameters of the coupling coils in the case of different wires anddifferent shapes, then established the experimental platform and chose the initiallyfrequency for the system.Finally, with the experimental platform, the transmission characteristics of theresearch in the paper can be analyzed and verified. The transmission characteristicsmainly contain the load characteristics, the frequency characteristics and thecharacteristics when the coil has a displacement in the vertical and horizontaldirection. In order to meet the transmit power and the improvement of transmissionefficiency, he parameters in the experiment system is accordingly adjusted. At thesame time, the long time stability of the system needs to be ensured.As the experimental results shown, the hardware platform can realize a5~8cmfree movement in the vertical direction. Also, when the coupling coil has a largerrelative horizontal displacement which means the transmit coil (square in shape, 25cm*15cm in size) and the receive coil can has a large-scale movement; thesystem can still ensure the power of different loads and keep a high transmissionefficiency. In the end, the system is tested and verified can work stability during along time by experiment.