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.


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    Title :

    Foreign object removal device and coil device


    Contributors:

    Publication date :

    2021-11-17


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    English


    Classification :

    IPC:    H02J CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER , Schaltungsanordnungen oder Systeme für die Abgabe oder Verteilung elektrischer Leistung / B60L PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES , Antrieb von elektrisch angetriebenen Fahrzeugen



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