Analysis of S-S Resonance Compensation Circuit of Electric Vehicle Wireless Power Transfer System

Wireless power transfer (WPT) plays a crucial role in battery charging of electric vehicles (EVs). In order to compensate for leakage inductance and magnetizing inductance, the resonant compensation topology is usually added to the magnetically coupled resonant wireless power transfer system (MCR-WPTS). The S-S compensation topology is studied and analyzed. A detailed mathematical model and a simulation model are established. The expressions of output current, voltage and transmission power are derived. The relationship between the input, output current, output voltage, transmission power and load and mutual inductance of S-S compensation topology is shown by simulation. The simulation shows consistent results with the analysis. In addition, this paper analyzes the sensitivity of the capacitance parameters in the Matlab/Simulink simulation model, and obtains the changing trend of the transmission power of the system with the capacitance parameters, which provides support for the further research on the selection of capacitance parameters.