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J Electromagn Eng Sci > Volume 11(3); 2011 > Article
Journal of the Korean Institute of Electromagnetic and Science 2011;11(3):166-173.
DOI: https://doi.org/10.5515/JKIEES.2011.11.3.166   
Reduction of Electromagnetic Field from Wireless Power Transfer Using a Series-Parallel Resonance Circuit Topology
Jong-Hoon Kim1, Hong-Seok Kim1, In-Myoung Kim2, Young-Il Kim2, Seung-Young Ahn1, Ji-Seong Kim1, Joung-Ho Kim1
1Department of Electrical Engineering, Korea Advanced Institute of Science and Technology (KAIST)
2Future Energy Unit, ENERCONSTech. Co., Ltd.
Abstract
In this paper, we implemented and analyzed a wireless power transfer (WPT) system with a CSPR topology. CSPR refers to constant current source, series resonance circuit topology of a transmitting coil, parallel resonance circuit topology of a receiving coil, and pure resistive loading. The transmitting coil is coupled by a magnetic field to the receiving coil without wire. Although the electromotive force (emf) is small (about 4.5V), the voltage on load resistor is 148V, because a parallel resonance scheme was adopted for the receiving coil. The implemented WPT system is designed to be able to transfer up to 1 kW power and can operate a LED TV. Before the implementation, the EMF reduction mechanism based on the use of ferrite and a metal shield box was confirmed by an EM simulation and we found that the EMF can be suppressed dramatically by using this shield. The operating frequency of the implemented WPT system is 30.7kHz and the air gap between two coils is 150mm. The power transferred to the load resistor is 147W and the real power transfer efficiency is 66.4 %.
Key words: Wireless Power Transfer (WPT), Electromagnetic Field (EMF), Equivalent Circuit Model Analysis, Series-Parallel Resonance Topology, CSPR, Inductive Coupling

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