Wireless charger
AssigneeNXP B. V.
InventorsJohannes Petrus Maria van Lammeren, Aliaksei Vladimirovich Sedzin, Klaas Brink
Life of this patent
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Abstract
An apparatus (pad) and method for wirelessly charging a receiver are disclosed. The pad includes one or more NFC antennas which can receive an NFC signal from the receiver. The pad also contains one or more charging coils. Measurement of the signal strength at each charging NFC antenna helps determine which charging coil(s) should be utilized to effect the most efficient charging of the receiver.
Claims11
A method for charging a receiver capable of creating an NFC field comprising:
- providing a pad having a plurality of charging coils arranged in an array and a plurality of NFC antennas arranged in an array;
- placing said receiver upon said pad;
- causing said receiver to create an NFC field;
- measuring said NFC field strength at two or more NFC antennas in said pad;
- comparing said NFC field strengths at said two or more NFC antennas to determine at least one NFC antenna with greater field strength;
- selecting one or more charging coils associated with said at least one NFC antenna according to a predetermined rule;
- activating said one or more charging coils to charge said receiver.
A charging pad comprising:
- a plurality of charging coils arranged in an array and a plurality of NFC antennas arranged in an array;
- each of said charging coils being associated with a respective said NFC antenna and being capable of being activated to charge a receiver after measurement of field strength at its respective NFC antenna.
A charging pad comprising a plurality of charging coils, each said coil having first, second, and third taps;
- said first and second taps being located to permit the reception of an NFC signal;
- and said first and third taps connecting to the ends of said coil for providing charging energy.
Dependencies are inferred from the claim text.