学术文献库

The dynamics and performance of a two-coil resonant coupled wireless power transfer system are investigated. At high coupling, the frequency-splitting phenomenon occurs, in which the power transferred to the load attains its maximum at two frequencies away from the resonance frequency. However, this behavior is not a universal property; there exist certain regions of resonator intrinsic parameters in which it is not present for any coupling strength. Therefore, in order to suppress such a phenomenon, there is no need to constrain the coupling of the transmitter and receiver below a certain level as widely reported in the literature. For low-power applications, optimizing the received power is essential. We derive a rigorous asymptotic upper bound for the power that can be delivered to an arbitrary load from a generic source. Our results quantitatively reveal the direct impacts of the unloaded $Q-$factors of the two resonators and the coupling between them on the actual output power. We discuss that, in contrast to the often employed operating power gain, the transducer power gain constitutes a more suitable metric to optimize system efficiency. Once the transferred power reaches its physical bound, the two gains collapse to a unique global optimal solution.