A device for the removal of foreign objects M from between coils of a wireless power transfer (charging) system, comprising: a surface 26 covering a coil C2 comprising a plurality of fluid ejection holes H for forcing the obstruction away; and a removal unit 30 connected to the holes. The removal unit has a plurality of sensors 34 to detect a flow rate or pressure supplied to the holes thereby determining whether a foreign object is present. The control unit may determine whether or a foreign object is present from whether the detected pressure or flow value satisfies a threshold and alter the flow rate accordingly. A control unit 35 may change the output of a fluid supply unit based on the detected flow or pressure value. The control unit may set the flow rate of an obstructed hole H to a higher output than an unobstructed hole H2-3. The fluid ejection holes may be arranged in a concentric pattern wherein the inner diameter of the fluid ejection holes may increase with radial distance from the centre.
Foreign object removal device and coil device
17.11.2021
Patent
Elektronische Ressource
Englisch
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