Wireless power transfer via magnetically coupled resonance (WPTMCR) is a new technology utilizing the resonance of two magnetically coupled resonant coils to efficiently transfer electric power wirelessly. Compared with other methods, it has merits of nearly omni-directional high power transfer efficiency over mid-range distances, safety and reliability. This thesis thoroughly investigated the basic WPTMCR theories, several new theoretical issues, and potential pitfalls in WPTMCR experiments and applications. Key contributions of this thesis include: (1) We analyzed the basic theoretical issues of WPTMCR from the circuit viewpoint: the effect of resonance, critical coupling and frequency split, the maximum efficiency and its conditions. We proposed a new design scheme for resonant coils by attaching high Q high voltage RF capacitors to participate in the coil resonance. This scheme will solve the scale-down problem of resonant coils and decrease the difficulty of matching the resonant frequency of two resonant coils and improve the match accuracy of the resonant frequency. The effects of distributed parameters of real WPTMCR systems were analyzed and dealing methods were also suggested. (2) We analyzed three new theoretical issues of WPTMCR in detail: multi-load problem, repeater resonant coil problem and multi-antenna problem from the circuit viewpoint. The circuit models of these issues were built and the responses of the circuit models were analyzed. The corresponding strategy to adjust these systems to optimum states was suggested and the corresponding maximum transfer efficiency formula was also derived. (3) We proposed a new idea to fabricate the resonant coils on printed circuit boards (PCB) and integrate the wireless power transfer system on a pair of PCBs which can improve the stability and manufacturability of the system for electronic consumer products. Several coil patterns that can be implemented on PCBs were proposed and extensive experiments on the characteristics of PCB resonant coils were conducted. The optimum coil pattern was suggested and the corresponding model was revised to reflect the changes introduced by PCB materials. A prototype of a PCB WPTMCR system based on PCB resonant coils was designed and tested to verify the theory of WPTMCR and the idea of fabrication PCB resonant coils and integration of the system on a pair of PCBs. (4) We designed and implemented a wireless power table to demonstrate the WPTMCR technology wh...
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