METHOD FOR DETECTING FOREIGN MATERIAL, AND APPARATUS AND SYSTEM THEREFOR
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Accused Products
Abstract
The present invention relates to a method and an apparatus for detecting foreign material for wireless charging, and according to one embodiment of the present invention, a method by which a wireless power transmitter detects foreign material comprises the steps of: measuring the strength of a current inputted into an inverter in a ping step; receiving a packet including a receiver type identifier; determining a threshold value for detecting the foreign material corresponding to the receiver type identifier; and comparing the measured strength of current with the threshold value so as to determine whether the foreign material is present.
9 Citations
29 Claims
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1-12. -12. (canceled)
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13. A method of detecting a foreign object in a wireless power transmitter, the method comprising:
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measuring a strength of current input to an inverter in a ping phase; receiving a packet including a receiver type identifier; determining a threshold value for foreign object detection corresponding to the receiver type identifier; and comparing the measured current strength with the threshold value to determine whether the foreign object is present. - View Dependent Claims (14, 15, 16, 17)
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18. A method of detecting a foreign object in a wireless power transmitter, the method comprising:
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calculating a change ratio of current input to an inverter in a ping phase; receiving a packet including a receiver type identifier; determining a current strength threshold ratio for foreign object detection corresponding to the receiver type identifier; and comparing the calculated current change ratio with the current strength threshold ratio to determine whether the foreign object is present. - View Dependent Claims (19, 20, 21, 22)
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23. A foreign object detection apparatus comprising:
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a inverter configured to convert DC power to AC power; a sensor measuring a strength of current input to the inverter in a ping phase; a demodulator receiving a packet including a receiver type identifier; and a controller determining a threshold value for foreign object detection corresponding to the receiver type identifier and to compare the measured current strength with the threshold value to determine whether the foreign object is present. - View Dependent Claims (24, 25, 26, 27, 28, 29)
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Specification