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Investigations on an inductive power transfer coupler with two or three windings

Eva Palmberg (Institutionen för rymd- och geovetenskap)
Göteborg : Chalmers University of Technology, 2015. - 23 s.

In this paper the use of two or three resonant coils in the transformer part of a high power transfer system is analysed. The inductances for actual coil setups are calculated using FEM programs. Kirchhoff's laws are then used for calculation of currents, voltages and power. Approximate equivalent circuits of the transformer as seen from the sending and receiving coils are developed. The voltage fed to the transformer is a square wave. It is possible to use only the fundamental frequency component for the calculations. A laboratory device is used for measuring and calculation of losses, the magnetic fields etc. This charger is carefully examined. It is found that two or three coils can transfer the desired power to the load. The auxiliary coil must be close to the sending coil. The frequency must be close to resonance. It is also found that the 2 or 3 coils setups will have almost the same efficiency. Using three coils it is easier to lessen the magnetic field inside and outside the charger. The three coil model is less sensitive to misalignments.

Nyckelord: high power transfer, inductive charging, electric vehicle, third winding, resonance

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Denna post skapades 2016-01-20. Senast ändrad 2016-01-27.
CPL Pubid: 231013


Institutioner (Chalmers)

Institutionen för rymd- och geovetenskap (2010-2017)



Chalmers infrastruktur

Ingår i serie

Technical report - Department of Energy and Environment, Division of Electric Power Engineering, Chalmers University of Technology