Study on Control Technique of Power Electronics System for Wireless Power Transfer via Electromagnetic Resonance Coupling

电磁谐振耦合是一种新型的无线电能传输技术。该技术高度依赖于负载值，并且需要快速控制技术。通常，通过切换具有不同值的冷凝器来实现控制。然而，所使用的机械开关具有缓慢的响应。因此，需要快速控制电力电子电路以实现阻抗匹配。该方法结合了电力电子学和磁共振耦合。本研究提出三个领域的建立。(1)利用电力电子电路进行阻抗匹配：在本研究中，利用电力电子快速控制技术来防止由于负载值变化而导致的效率下降。(2)估计方法：从发送侧估计负载值。(3)功率分配：可控功率分配，与接收机数量无关。

Electromagnetic resonance coupling is a new wireless power transfer technology. This technology is highly dependent on load values and fast control technique is required. Typically, control is implemented by switching condensers with different values. However the mechanical switches used have slow response. Therefore, a fast control of power electronics circuit for impedance matching is needed. The method combines power electronics and magnetic resonance coupling. The establishments of three areas are proposed in this research. (1) Impedance matching using power electronics circuit: in this study, fast control technique with power electronics is used to prevent efficiencydrop due to load value change. (2) Estimation method: estimating the load values from transmitting side. (3) Power division: controllable power division regardless of the number of receiver.