Wireless power receiver and/or foreign object detection by a wireless power transmitter
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United States of America Patent
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Apr 10, 2018
Issued Date -
N/A
app pub date -
Mar 25, 2015
filing date -
Apr 4, 2014
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Abstract
A wireless power transmitter includes an analog-to-digital converter (ADC) and a controller. The ADC is configured to convert an analog signal associated with a power train to digital values. The controller is configured to cause pulses to be applied to the power train to thereby cause the power train to ring, receive digital values from the ADC acquired while the power train is ringing and after the pulses complete, and, based on an analysis of the digital values of the ringing of the power train, to determine whether a wireless power receiver is present on or near the wireless power transmitter or whether a foreign object is present on the transmitter.
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