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Planar coils with litz wires are used a lot in inductive power transfer for electric vehicles. When the litz wire is properly selected for the coil, the winding resistance is composed of DC resistance and proximity-effect resistance. The calculation of DC resistance is simple, using the cross-sectional area and the length of the wire, but the calculation of proximity-effect resistance is complicated,...
The stray magnetic field around inductive-power-transfer coils is influenced by the phases of the transmitter's and receiver's currents. This influence is analyzed with the diagrams of phasors for the currents and magnetic fields. The dual-side-controlled converter is applied for the circuit realization, in which the bridges with MOSFETs are used for the inverter on the transmitter side and rectifier...
Significant stray magnetic field exists around the inductive-power-transfer (IPT) coils owning to the large gap between transmitter and receiver. In this paper, the field is attenuated by controlling the phases of windings’ currents. The relationship between magnetic field and windings’ currents is analyzed according to the diagrams of phasors. The dual-side-controlled converter is used for circuit...
Coils' efficiency and stray magnetic field should be optimized together when designing coils for inductive power transfer. Multi-objective optimization using Pareto front is a suitable method. It also provides a straightforward and accurate insight of the relationship between coils' efficiency and stray magnetic field since all the solutions along the fronts are optimized structures. In this paper,...
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