Research On Wireless Power Transfer Based On Magnetic Coupling Resonance

Wireless power transmission is a new technology achieved by means of electric andmagnetic. Currently, inductively coupled, microwave radiation and magnetic couplingresonance are three main ways to transmit energy. Compared with the first two ways,magnetic coupling resonance has great advantages at transmission characteristics,transmission direction, penetrating and security. Therefore, this way has caused theattention of domestic and foreign scholars, and has good prospects for development.In this paper, the basic principle of magnetic coupling resonance is briefly analyzed,two key conditions of magnetic coupling and resonance are proposed to realize wirelesspower transmission. Based on this discussion, magnetic coupling resonance with a series-series topology compensating is put up.The resonant coupling loop in the system is conducted a modeling analysis based onthe circuit theory, factors that affect the transmission characteristics are derived such astransmission distance, resonant frequency, quality factor and so on. Then thetransmission distance, resonant frequency, quality factor are controlled as variable insequence to get the corresponding output power and transmission efficiencycharacteristics, and these characteristics are verified through matlab simulations andexperiments. In order to solve the phenomenon that the output power is larger whiletransmission efficiency is relatively low, a comprehensive evaluation index of theefficacy product is exploited to optimize the system parameters. Besides output powerand transmission efficiency are compared under the two indicators of maximum powerand maximum efficacy product. Finally, results from Matlab simulations and experimentsverify the feasflysibility of efficacy product index.