The Analysis And Design For Magnetic Coupling Resonant Wireless Power Supply System

Recently, there are some problems in cable power supply, which makes it step up research of wireless power supply. Magnetic coupling resonant wireless power technology has the medium transmission distance and high transmission efficiency. In terms of reliability, safety and EMC, magnetic resonant wireless power supply technology is more advantage than others. The implementation of magnetic coupling resonant wireless power supply system is mainly through two coils magnetic field coupling. And the electric energy transmits from transmitting coil to receiving coil to supply the load. It doesn’t need any wire between two coils. In additions, energy transmission is not affected by non-magnetic obstacle in the space, which makes it have a very good directivity and disruptive. Magnetic coupling resonant wireless power supply scheme has some advantages which other transmission way does not have. It is a new kind of unprecedented energy transmission technology with a very broad application prospects.This paper introduces the resonant wireless power transmission principle and system structure in detail. Based on the basic knowledge of the coupled-model and circuit model, we can get that the transmission performance is interacted by the coupling coefficient, loss coefficient, number of windings, the quality factor, resonance frequency, and how they influence each other. And get basis parameter through matlab simulation. The purpose is to realize the system as high as possible for a particular load with certain power and distance.The efficiency and output voltage of the magnetic coupling resonant wireless power supply system are key points in this paper. According to the system parameters, select components and construct the hardware circuit through actual situation and local experiments. Test various components’ characteristics in the high frequency. Test the transmission efficiency, the output voltage and the distance between two coils. Then, it analyses the relationship between the power, efficiency and the system parameters. Measurement results finally ensure the design can realize.