Electrical processes analysis in a wireless power transfer system for electric vehicle battery charging

Abstract

The article considers the electrical processes taking place in a wireless energy transfer system for charging the battery of an electric vehicle. The main way to transfer energy through the airspace between the road and the electric car is the inductive coupling of two coils. It is known that the efficiency of the system increases if electric resonance is established in two independent circuits. The choice of the resonant frequency largely depends on the resonant circuit. The work aims to analyze a series-series resonance circuit and justify the choice of a resonant frequency for a given topology. As a result of the study, the author has obtained the dependences of the active and reactive resistance on the frequency, the possible resonance conditions, and a bicubic equation that allows calculating the resonant frequencies for those two types of resonance. Moreover, a computer model has been created, the parameters of which determined the optimal resonant frequency. This research work helps to choose reasonably resonant frequencies depending on the required efficiency of the system with a series-series resonant circuit.