Device detection through dynamic impedance change measurement
First Claim
1. A device for detecting placement of a wireless power receiver having a receiver capacitor in a charging region of a wireless power transmitter, comprising:
- a transmit circuit comprising a transmit coil and configured to wirelessly transmit power via a wireless field applied to the charging region to a receive coil of the receiver during a first period and a second period; and
a detection circuit configured to i) detect a plurality of waveforms, of the transmit circuit, comprising a first waveform caused by a non-receiver object placed in the charging region and a second waveform that is a characteristic waveform caused by at least a charging pattern of the receiver capacitor in response to the receiver being placed in the charging region, ii) determine that the second waveform is the characteristic waveform of the receiver capacitor based on observing the charging pattern of the second waveform, and iii) determine whether the non-receiver object or the receiver is placed within the charging region based on detecting the first waveform or the second waveform.
1 Assignment
0 Petitions
Accused Products
Abstract
Inventive aspects include systems, methods, and apparatuses for detecting placement of a wireless power receiver in a charging region of a wireless power transmitter. For example, the apparatus may include a transmit circuit comprising a transmit coil and be configured to wirelessly transmit power via a wireless filed applied to the charging region to a receive coil of the receiver. The apparatus may also include a detection circuit configured to detect a characteristic waveform resulting from the field that is applied to the charging region or changed between the transmit and receive coils, in response to the receiver being placed in the charging region.
18 Citations
34 Claims
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1. A device for detecting placement of a wireless power receiver having a receiver capacitor in a charging region of a wireless power transmitter, comprising:
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a transmit circuit comprising a transmit coil and configured to wirelessly transmit power via a wireless field applied to the charging region to a receive coil of the receiver during a first period and a second period; and a detection circuit configured to i) detect a plurality of waveforms, of the transmit circuit, comprising a first waveform caused by a non-receiver object placed in the charging region and a second waveform that is a characteristic waveform caused by at least a charging pattern of the receiver capacitor in response to the receiver being placed in the charging region, ii) determine that the second waveform is the characteristic waveform of the receiver capacitor based on observing the charging pattern of the second waveform, and iii) determine whether the non-receiver object or the receiver is placed within the charging region based on detecting the first waveform or the second waveform. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 30, 31)
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17. A method for detecting placement of a wireless power receiver having a receiver capacitor in a charging region of a wireless power transmitter, comprising:
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transmitting power via a wireless field applied to the charging region to a receive coil of the receiver via a transmit coil of a transmit circuit during a first period and a second period; detecting a plurality of waveforms, of the transmit circuit, comprising a first waveform caused by a non-receiver object placed in the charging region and a second waveform that is a characteristic waveform caused by at least a charging pattern of the receiver capacitor in response to the receiver being placed in the charging region; determining that the second waveform is the characteristic waveform of the receiver capacitor based on observing the charging pattern of the second waveform; and determining whether the non-receiver object or the receiver is placed within the charging region based on detecting the first waveform or the second waveform. - View Dependent Claims (18, 19, 20, 21, 22, 23, 32)
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24. An apparatus for detecting placement of a wireless power receiver having a receiver capacitor in a charging region, comprising:
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means for transmitting power via a wireless field applied to the charging region to a receive coil of the receiver during a first period and a second period; means for detecting a plurality of waveforms, of the means for transmitting power, comprising a first waveform caused by a non-receiver object placed in the charging region and a second waveform that is a characteristic waveform caused by at least a charging pattern of the receiver capacitor in response to the receiver being placed in the charging region; means for determining that the second waveform is the characteristic waveform of the receiver capacitor based on observing the charging pattern of the second waveform; and means for determining whether the non-receiver object or the receiver is placed within the charging region based on detecting the first waveform or the second waveform. - View Dependent Claims (25, 26, 27, 28, 33)
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29. A non-transitory computer readable medium comprising code that, when executed, causes an apparatus to:
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transmit power via a wireless field applied to a charging region to a receive coil of a receiver via a transmit coil of a transmit circuit during a first period and a second period, the receiver having a receiver capacitor; detect a plurality of waveforms, of the transmit circuit, comprising a first waveform caused by a non-receiver object placed in the charging region and a second waveform that is a characteristic waveform caused by at least a charging pattern of the receiver capacitor in response to the receiver being placed in the charging region; determine that the second waveform is the characteristic waveform of the receiver capacitor based on observing the charging pattern of the second waveform; and determine whether the non-receiver object or the receiver is placed within the charging region based on detecting the first waveform or the second waveform. - View Dependent Claims (34)
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Specification