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Design, analysis and implementation of a 50 w wireless charger of a charging vest battery

2019
Eren, Merih
Wireless power transfer (WPT) has been a very popular research topic for a variety of applications with power ratings ranging from few watts to several kilowatts. High power levels are mostly used in electric vehicle charging applications whereas lower power level applications are mostly in household appliances, wearable devices and medical implants. Topology, geometries of the transferring and receiving coils and their relative positions are fundamental parts that affect performance of WPT systems. In WPT systems, the most common problem is the degradation of the performance in case of a misalignment of the transferring and receiving coils. Moreover, shielding of the magnetic field is high of importance for on body charging systems like charging vests to meet the electromagnetic field restrictions for human tissue. In this thesis, a 50 W WPT system for battery charging in charging vests is studied in terms of topology selection and coil design. A series-series compensated type inductive power transfer topology is selected and two different coil pairs (transmitter-receiver) that correspond to different resonant frequencies are determined. These configurations are chosen by using a Pareto-front optimization approach that is applied to find out designs with a high efficiency over a wide range of frequencies and misalignments.Furthermore, performances of possible shield designs are studied by using finite element analysis for those two designs. The selected WPT systems are prototyped and tested to validate the analytical and numerical analysis results.