Design of dual-band coil for wireless power transfer system via magnetic resonant coupling

Article type: Research Article

Authors: Li, Ran^* | Li, Lin

Affiliations: State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources, North China Electric Power University, Beijing 102206, China

Correspondence: [*] Corresponding author: Ran Li, State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources, North China Electric Power University, Beijing 102206, China. Tel.: +86 15231271099; E-mail:[email protected]

Abstract: For wireless power transfer (WPT) systems, communication between the two terminals of power transfer system is also an important problem to be solved. This paper proposes a design method of multi-turn dual-band coil for implementing synchronous transfer of power and data in WPT system with one set of WPT coils. An extra compensation circuit is inserted into the multi-turn spiral coil, so the new coil has two resonant frequencies that lie on both sides of the original resonant frequency of the multi-turn coil. Just one set of dual-band coils is used to provide the data and power transfer via two different resonant frequencies, so the undesirable interference in multi-coil WPT system is avoided. The equivalent circuit model is built to analyze the characteristic of the dual-band WPT system. The data pickup circuit is analyzed and designed for the receiver of WPT system. Finally, a dual-band WPT prototype with data pickup circuit is built to demonstrate the effectiveness of the proposed dual-band WPT system.

Keywords: Magnetic resonant coupling (MRC), wireless power transfer (WPT), data transmission, dual-band coil

DOI: 10.3233/JAE-160078

Journal: International Journal of Applied Electromagnetics and Mechanics, vol. 53, no. 3, pp. 511-521, 2017