Parameter Analysis Influencing Inductive Power Transfer: a review

Abstract

Inductive power transfer systems are increasingly used for electric vehicles, mobile phones, and implantable devices. However, the main challenge to their widespread use is limited transfer efficiency. This paper performed a literature review of the main parameters influencing inductive power transfer efficiency, such as mutual induction, primary coil current, frequency, and quality factor. Since coil geometry is crucial in determining efficiency in inductive power transfer, the benefits and limitations of two widely used coil configurations will be analyzed: circular and square. The principal finding of this paper is that enhancing power transfer efficiency requires careful adjustment of multiple parameters. These include increasing the number of coil turns, raising the current, optimizing the quality factor, reducing the air gap, and controlling misalignment. However, excessive modification of any parameter can produce undesirable effects on overall system efficiency. Therefore, a trade-off analysis must be conducted to determine the optimal values for each parameter, considering system constraints and specific application requirements.