Foreign object detection using decay counter for Q-estimation

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United States of America Patent

PATENT NO 11936207
APP PUB NO 20230253836A1
SERIAL NO

17669113

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ATTORNEY / AGENT: (SPONSORED)

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Abstract

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A method of foreign object detection by a wireless power delivery system is disclosed. A decaying coil voltage signal of a transmitting coil of the wireless power delivery system is detected. A first comparator is used to trigger a cycle count of the decaying coil voltage signal. When the first comparator triggers the cycle count, a second comparator is used to count a number of cycles of the decaying coil voltage signal. A quality factor (Q-factor) of the transmitting coil is determined based on the number of cycles of the decaying coil voltage signal, a reference signal of the first comparator, and a reference signal of the second comparator. Whether a foreign object is present is determined based on the Q-factor and a foreign object detection (FOD) threshold level.

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Patent Owner(s)

  • CYPRESS SEMICONDUCTOR CORPORATION

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Balia, Tudu Rushika Banam Bangalore, IN 1 0
Kedilaya, Vishwas Bangalore, IN 1 0
Nagamangala, Muninarayanappa Jeevith Kumar Bengaluru, IN 2 1
Vijayakumar, Prasanna Venkateswaran Bangalore, IN 6 4

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