Reactive power correction for an inductive power transfer system for EV application: Circuit and Control

摘要

A resonant circuit topology is generally applied in inductive power transfer (IPT) systems for electric vehicle battery charging to minimise the switching losses of IGBT. Various IPT systems under development ensure high-efficiency, if there is no misalignment. Each park process can cause high power losses due to a new resonance frequency, which occurs as a result of changing inductances, if the coils have misalignment. Power losses of IGBT soft switching can be reduced by tuning the operating frequency. Therefore, in this paper, a hardware for the frequency control of IPT system is developed, in which the hardware approximates operating frequency to the resonance frequency. In the software, the elimination of the bifurcation phenome is considered. An IPT system with a series-series compensated topology is used for laboratory setup.