Apparatus, system, and method for detecting a foreign object in an inductive wireless power transfer system based on input power
First Claim
1. An inductive wireless power transfer device, comprising:
- a transmitter configured to generate an electromagnetic field to a coupling region for providing energy transfer to a wireless power receiving apparatus, wherein the transmitter includes control logic configured to;
determine a first input power of the transmitter from a ping generated during a sleep mode;
determine a presence of a foreign object within the coupling region in response to a comparison of the first input power to a first desired threshold;
reduce a frequency of the ping in response to determining the presence of the foreign object; and
transmit the ping at the reduced frequency.
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Accused Products
Abstract
An inductive wireless power transfer system comprises a transmitter configured to generate an electromagnetic field to a coupling region for providing energy transfer to a wireless power receiving apparatus. The transmitter includes control logic configured to determine a power component of the transmitter, and determine a presence of a foreign object within the coupling region in response to a comparison of the power component and a desired threshold for the power component. Related inductive methods for detecting a foreign object in an inductive wireless power transfer coupling region of an inductive wireless power transfer system and operating a sleep mode of a wireless power transmitter are disclosed.
53 Citations
25 Claims
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1. An inductive wireless power transfer device, comprising:
a transmitter configured to generate an electromagnetic field to a coupling region for providing energy transfer to a wireless power receiving apparatus, wherein the transmitter includes control logic configured to; determine a first input power of the transmitter from a ping generated during a sleep mode; determine a presence of a foreign object within the coupling region in response to a comparison of the first input power to a first desired threshold; reduce a frequency of the ping in response to determining the presence of the foreign object; and transmit the ping at the reduced frequency. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A method for detecting a foreign object in a coupling region of an inductive wireless power transfer device, the method comprising:
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determining a first input power drawn by a wireless power transmitter during a ping generated during a sleep mode; determining a presence of a foreign object within a coupling region of the wireless power transmitter based on a comparison of the first input power and a first desired threshold; and reducing a frequency of the ping in response to determining the presence of the foreign object; and transmit the ping at the reduced frequency. - View Dependent Claims (15, 16, 17, 18, 19, 20)
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21. A method of operating a sleep mode of a wireless power transmitter, the method comprising:
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monitoring a first input power of a ping of a wireless power transmitter during a sleep mode; comparing the first input power to a first desired threshold for the wireless power transmitter; determining a presence of a foreign object in a coupling region of the wireless power transmitter responsive to the first input power exceeding the first desired threshold for the wireless power transmitter during the sleep mode; reducing a frequency of the ping in response to determining the presence of the foreign object; and transmit the ping at the reduced frequency. - View Dependent Claims (22, 23, 24, 25)
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Specification