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Abstract

A wireless energy transfer system based on magnetic resonant technology for power transmission and rats playground recharging is studied. The relationship among the self-inductance, mutual-inductance, the maximum approachable efficiency and several key parameters of the system are analyzed. The coupling coefficient, which depends on the above factors, is illustrated through related equations and curves. According to the specifications of energy storage and available space, a wireless energy transfer system with a seven-circular-coil transmitter and one ``box'' receiver has been studied. The array transmitter has been fabricated to make the produced magnetic field over the playground even and then transfer enough energy. The fabricated novel small ``box'' receiver, consisting of a tape coil on one layer, which is separated by an insulation layer, is designed and compared with the normal receiver coil. The magnetic field intensity above the transmitter and the system efficiency are simulated by FEM analysis. The standing wave ratio and the system efficiency with different distances and displacements are measured. The efficiency of wireless charging system we designed is up to 45% at the resonant frequency 5.56 MHz with the distance of 30 mm. And even the misalignment occurred, the efficiency of the proposed system keeps comparatively stable.

Keywords

Power transmission resonant rats playground Witricity technology

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Study of resonant self-charging rats experiment playground based on Witricity technology

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