Abstract
The design of contactless power supplies with inductive power transfer (IPT) is still a challenge even though such systems have become more and more established for various applications. This article presents an intuitive, educational introduction to IPT system design for practicing engineers who are new to the field. While following the path of the energy through the IPT system, the contactless power transfer is explained with a circuit-oriented approach, extended by an analysis of the field patterns and the energy flux across the air gap. Finite element method simulation results for the Poynting vector are shown to illustrate the power transfer process. Finally, a minimization of the reactive power demand of the IPT coils is performed, from which the general requirements for an efficiency optimal design of the IPT system can be intuitively understood.
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