A new design of wireless power transfer using cubic magnetically-coupled resonant

摘要

Wireless power transfer (WPT) offers the promise of cutting the last cord, making users to recharge portable electronic devices easily through the air. In this paper, a high efficient wireless power transfer via strongly magnetically-coupled resonant is designed. It can be divided into two parts components, transmitter composed by four pairs of inductive coils that are connected to be a cube-shaped structure, receiver formed by using planarized printed spiral coils. As we all know, the issue related to the planar structure is the rapid decrease of the transfer efficiency due to the misalignment of the receiver and the receiver coils is moved away from its optimal distance from the transmitter coils, the transfer efficiency decreases rapidly too. The structure of cube is presented and power transfer of horizontal omnidirectional can be achieved. The tuned frequency introduced, it is possible to transfer efficiency that adjusts to provide maximum possible efficiency as a user moves the receiver to locations within the working rang. To facilitate and optimize the design, the equivalent circuit model of proposed wireless power transfer is derived, and then the transmission characteristics of the WPT are studied. Using the basic theory, which have shown that there is an optimal frequency to achieve the maximum transfer efficiency. Numerical estimation predicts over 60% efficiency of the wireless power transfer which tuned frequency is used at distance of 50-500mm range. The proposed size of receiver is 250 × 250mm2, so the proposed structure of cube is suitable for wireless power transfer of portable electronic devices. Finally, the optimized performance through Ansoft HFSS 13.0 simulations is verified.