Design of a Coil Geometry for Generating Magnetic Field to Evaluate Biological Effects at 85kHz

Abstract

In recent years, the use of induction-heating systems has increased and wireless power transmission (WPT) systems have been discussed. These applications are installed close to a human body. Therefore, it is important to discuss the effects of alternating magnetic fields and to evaluate electromagnetic interference. This paper discusses the design procedure of a magnetic field generator to evaluate the electromagnetic interference at 85kHz which is being studied in WPT systems for EV and HEV. The magnetic field generator presented in this paper consists of a single-phase inverter circuit that uses SiC-MOSFETs and an air-core inductor that is used as the coil for generating a magnetic field. In particular, this paper shows that the coil used for generating magnetic field needs to reduce the winding voltage to generate higher magnetic flux. In addition, this paper presents the design procedure of the proposed coil structure which can satisfy some limited conditions. The experimental results of the proposed system rated at 82kHz and 100A are presented.