In this paper, a method for removing the "dead spots" and stabilizing the position-sensitive power transfer efficiency in a three-phase contactless energy transfer desktop is presented. "Dead spots" result from the non-uniform distribution of the primary coils’ magnetic field intensities and the out-ofphase currents they are excited with. When the secondary coil is inside a "dead spot" there is no induced voltage, secondary current, or power transfer. The primary controller can not distinguish between a "dead spot" and a fully charged "receiving device" drawing no current. In this work it is shown, that a temporary unbalancing of the currents inside an activated primary coil cluster will result in an induced secondary voltage. The resultant secondary current flow will produce changes in the primary coils’ voltage and phase which can be detected by the primary controller. Following this method, the primary controller can detect "dead spots" and remove them by disabling and energizing different primary coils.
|Title of host publication||4th IEEE Benelux Young Researchers Symposium in Electrical Power Engineering, Eindhoven, The Netherlands, 7-8 February, 2008|
|Editors||L. Encica, B.L.J. Gysen, J.W. Jansen, D.C.J. Krop|
|Place of Publication||Eindhoven|
|Publisher||Technische Universiteit Eindhoven|
|Publication status||Published - 2008|