Design and Analysis of Class Φ Inverters in the Wireless Power Transfer

Wireless power transfer systems have been widely studied, especially in 13.56MHz. This paper presents a framework for modeling, analysis, and design a Class-Phi Inverter, a single switch topology with low switch voltage stress and fast transient. Building upon this foundation, a compensation topology was introduced to enhance the smoothness of the circuit's output voltage and achieve load-independent characteristics. Subsequently, simulation analysis and verification were conducted using LTspice. The results show that Class Phi inverter with SS compensation can improve the smoothness of the output waveform, have better filtering effect, and have a lower impact on the output voltage as the resistance changes.