Experimental System Design Of Magnetic Resonance Coupling Wireless Power Transfer And Research Of Transmission Characteristics

The WiTricity is a high efficiency power transfer technology that has been researchingwidely recently. This technology has great application potential, no matter on wirelesscharging or wireless power supply of implantable devices. Compared with conventionalinductive coupling wireless power transfer and electromagnetic radiation wireless energytransmission technology, magnetically coupled resonance wireless energy transfer has someadvantages of relatively larger transmission distance, higher transmission efficiency, the useof non-radiation characteristic, etc. But how to apply this technology to the human bodyinternal and external environment of energy transmission, especially how to make lowpower biological implanted electronic devices (such as cardiac pacemaker, nerve stimulator)power supply efficient deserves further study.In this paper, through designing a coupled magnetic resonance wireless powertransmission experimental system, we studied energy transmission characteristics of thesystem, had a research on the characteristic of four topological structure of the wirelesstransmission system based on coupled magnetic resonance. We focused on many factorsthat impacts the transmission efficiency of wireless energy transfer system, and put forwardseveral methods of improving the efficiency of wireless energy transmission.This paper proved that there was a great relationship between the efficiency of wirelessenergy transfer system and the load, the radius of the coil and the number of coil turnstheoretically. The theoretical analysis was verified by wireless energy transfer system basedon magnetic resonance coupling which was designed above. This paper used a method byincreasing a relay resonator between the source and device resonator, which can improvewireless transmission efficiency. Finally, we verified some conclusion made aboved andalso proved that the included angle of two coils between0and45degree has a slightinfluence on power transfer in experiment, which is basically identical with the twocollinear coil center axis of resonance energy transfer efficiency.