Wireless Inductive Power Transfer

Abstract

Research on wireless power transfer (WPT) technology has gained significant popularity in recent years due to the availability of high-power and high-switching frequency semiconductor devices. This chapter presents a brief overview and qualitative comparison of several possible WPT technologies. Inductive charging systems generally consist of a primary side power converter, an inductive interface transformer, and a secondary converter. In inductive coupling technology, if a significant air gap is introduced, the power transfer between the primary and secondary coil becomes ineffective. Considering the advantages of IPT technology, a detailed theory is included. The basic operating principle is like a two-winding transformer, where the magnetizing inductance is much lower than a conventional iron core transformer. In IPT systems VSI is compatible with series, LCL, or LCCL compensation networks. Magnetic coupling is an important factor in designing a wireless IPT system.