Systems, methods, and apparatus for foreign object detection loop based on inductive thermal sensing
First Claim
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1. An apparatus for detecting an object, comprising:
- a coil configured to inductively sense a presence of the object based on an electrical characteristic of the coil that varies as a function of a temperature of the object when the object is exposed to an alternating magnetic field;
a controller configured to;
detect a change in the electrical characteristic over time,determine a temperature response of the object, based upon the detected change in the electrical characteristic,schedule an exposure cycle for the magnetic field,compare the detected change in the electrical characteristic over at least a portion of time of the exposure cycle with the exposure cycle over the same period of time to identify a correlation between the detected change and the exposure cycle, anddetermine the presence of the object based on the detected correlation;
a transmitter configured to transmit a signal to adjust the magnetic field exposure; and
a receiver configured to receive a feedback signal indicating a timing schedule for the exposure cycle and a strength of the magnetic field exposure.
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Abstract
This disclosure provides systems, methods and apparatus for detecting foreign objects. An apparatus for detecting a presence of an object is provided. The apparatus includes a coil configured to inductively sense a presence of an object based on an electrical characteristic of the coil that varies as a function of a temperature of the object when the object is exposed to an alternating magnetic field. The apparatus further includes a controller configured to detect a change in the electrical characteristic.
41 Citations
23 Claims
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1. An apparatus for detecting an object, comprising:
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a coil configured to inductively sense a presence of the object based on an electrical characteristic of the coil that varies as a function of a temperature of the object when the object is exposed to an alternating magnetic field; a controller configured to; detect a change in the electrical characteristic over time, determine a temperature response of the object, based upon the detected change in the electrical characteristic, schedule an exposure cycle for the magnetic field, compare the detected change in the electrical characteristic over at least a portion of time of the exposure cycle with the exposure cycle over the same period of time to identify a correlation between the detected change and the exposure cycle, and determine the presence of the object based on the detected correlation; a transmitter configured to transmit a signal to adjust the magnetic field exposure; and a receiver configured to receive a feedback signal indicating a timing schedule for the exposure cycle and a strength of the magnetic field exposure. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method for detecting a presence of an object, comprising:
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generating an alternating magnetic field based upon an exposure cycle; sensing a presence of the object based on an electrical characteristic of a coil that varies as a function of a temperature of the object when the object is exposed to an alternating magnetic field; detecting a change in the electrical characteristic over time; determining a temperature response of the object, based upon the detected change in the electrical characteristic; scheduling an exposure cycle for the magnetic field; comparing the detected change in the electrical characteristic over at least a portion of time of the exposure cycle with the exposure cycle over the same period of time to identify a correlation between the detected change and the exposure cycle; determining the presence of the object based on the detected correlation; transmitting a signal to adjust the magnetic field exposure; and receiving a feedback signal indicating a timing schedule for the exposure cycle and a strength of the magnetic field exposure. - View Dependent Claims (10, 11, 12, 13, 14, 15)
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16. An apparatus for detecting an object, comprising:
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means for sensing a presence of the object based on an electrical characteristic of the sensing means that varies as a function of a temperature of the object when the object is exposed to an alternating magnetic field; means for detecting a change in the electrical characteristic over time; means for determining a temperature response of the object, based upon the detected change in the electrical characteristic; means for scheduling an exposure cycle for the magnetic field; means for comparing the detected change in the electrical characteristic of the sensing means over at least a portion of time of the exposure cycle with the exposure cycle over the same period of time to identify a correlation between the detected change and the exposure cycle; and means for determining the presence of the object based on the detected correlation. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23)
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Specification