Abstract

Wireless power transfer (WPT) technology has two origins of technical background. One is power electronics technology, in which WPT mechanism is considered as a transformer. The other is radio frequency (RF) technology, in which WPT mechanism is considered as a coupling of resonators. The aim of this chapter is to unveil the essence of coupled-resonant WPT by introducing a unified model that enables us to understand power electronics-based WPT and RF-based WPT in the same manner. In the first part of this chapter, unified model of resonance coupling WPT is conducted. This model enables us to understand the mechanism of resonant WPT system from the viewpoint of electric/magnetic coupling and resonance. In the later part, generalized WPT model is conducted. This model represents the whole WPT system including RF inverter and rectifier. By using this model, various kinds of WPT system can be explained from the viewpoint of impedance matching, resonance, and coupling.

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