Abstract:

Based on the calculation methods of both the mutual inductance between two air-core coils and the self inductance of a ferrite-core coil, the energy-receiving performances of the two-dimension orthogonal windings of the coil in micro electromeehanieal systems （MEMS） are investigated. Then, the influences of the position and the angle of the energy-receiving coil as well as the ferrite core on the coupling coefficient of MEMS are analyzed. The results of theoretical analysis are finally verified through simulations and experiments. It is found that the two-dimen- sion orthogonal windings can compensate each other at different attitudes and prevent low transmission efficiency, and that the ferrite core significantly enhances the coupling ability of MEMS. In addition, a micro rectifying circuit meeting the requirement of miniaturization is designed and fabricated by selecting suitable electronic components. Experimental results on the self-developed MEMS using the fabricated circuit indicate that the efficiency and stability of the proposed wireless energy transmission system meet the practical requirements well.

Key words: wireless energy supply, transmission, coupling coefficient, efficiency, micro electromechanical system