Energy transfer optimization by detecting and mitigating magnetic saturation in wireless charging with foreign object detection
First Claim
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1. A method for optimizing wireless charging of a mobile device by a wireless charger, the method comprising:
- determining whether a first power loss for a first wireless transmission of power from the wireless charger to the mobile device exceeds a threshold;
determining whether magnetic saturation occurred in at least one of the mobile device and the wireless charger during the first wireless transmission of power from the wireless charger to the mobile device in response to a determination that the first power loss exceeds the threshold; and
when magnetic saturation is determined to have occurred, successively reducing transmit power in the wireless charger until reaching an operating wireless transmit power, wherein neither the mobile device nor the wireless charger is in magnetic saturation at the operating wireless transmit power.
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Abstract
A method is provided for optimizing wireless charging of a mobile device by a wireless charger. The method comprises determining whether magnetic saturation occurred in at least one of the mobile device and the wireless charger during a first wireless transmission of power from the wireless charger to the mobile device; and, when magnetic saturation is determined to have occurred, successively reducing transmit power in the wireless charger until reaching an operating wireless transmit power, wherein neither the mobile device nor the wireless charger is in magnetic saturation at the operating wireless transmit power.
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Citations
20 Claims
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1. A method for optimizing wireless charging of a mobile device by a wireless charger, the method comprising:
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determining whether a first power loss for a first wireless transmission of power from the wireless charger to the mobile device exceeds a threshold; determining whether magnetic saturation occurred in at least one of the mobile device and the wireless charger during the first wireless transmission of power from the wireless charger to the mobile device in response to a determination that the first power loss exceeds the threshold; and when magnetic saturation is determined to have occurred, successively reducing transmit power in the wireless charger until reaching an operating wireless transmit power, wherein neither the mobile device nor the wireless charger is in magnetic saturation at the operating wireless transmit power. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method for optimizing wireless charging of a mobile device by a wireless charger, the method comprising:
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determining whether magnetic saturation occurred in at least one of the mobile device and the wireless charger during a first wireless transmission of power from the wireless charger to the mobile device based on a percentage difference between a first power loss and a second power loss, wherein the first power loss is determined for the first wireless transmission of power from the wireless charger to the mobile device, wherein the second power loss is determined for a second wireless transmission of power from the wireless charger to the mobile device; and when magnetic saturation is determined to have occurred, successively reducing transmit power in the wireless charger until reaching an operating wireless transmit power, wherein neither the mobile device nor the wireless charger is in magnetic saturation at the operating wireless transmit power. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. A wireless charger comprising:
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a primary coil; and a processor coupled to the primary coil and configured to; determine whether magnetic saturation has occurred in at least one of the primary coil and a mobile device being charged by the wireless charger during a first wireless transmission of power from the wireless charger to the mobile device based on a percentage difference between a first power loss and a second power loss, wherein the first power loss is determined for the first wireless transmission of power from the wireless charger to the mobile device, wherein the second power loss is determined for a second wireless transmission of power from the wireless charger to the mobile device; and successively reduce current in the primary coil until reaching an operating wireless transmit power when magnetic saturation has occurred in at least one of the primary coil and the mobile device, wherein neither the primary coil nor the mobile device is in magnetic saturation at the operating wireless transmit power. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification