A wireless power transfer system includes a transmitter with a transmitting coil, a first detection coil, and a second detection coil. The transmitting coil receives and wirelessly radiates power from a power supply to a receiver of a vehicle. In response to the radiated power from the transmitting coil, the first detection coil generates a first voltage, and the second detection coil generates a second voltage. A comparison system is electrically coupled to the transmitter. The comparison system declares presence of a foreign object in proximity to the transmitter in response to a difference between the first voltage and a first reference voltage exceeding a threshold value. The comparison system declares the presence of the foreign object in response to a difference between the second voltage and a second reference voltage exceeding the threshold value. The transmitter is selectively disabled in response to presence of the foreign object being declared.


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    Title :

    Foreign object detection in a wireless power transfer system


    Contributors:

    Publication date :

    2019-11-12


    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 / H01F MAGNETS , Magnete



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