Demodulator for wireless power transmitter
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United States of America Patent
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Feb 21, 2017
Grant Date -
Mar 12, 2015
app pub date -
Jun 18, 2014
filing date -
Jun 25, 2013
priority date (Note) -
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Abstract
A demodulator is mounted on a wireless power transmitter that conforms to the Qi standard, and demodulates an amplitude modulated signal superimposed on a coil current ICOIL that flows through a primary coil of a transmission antenna, or otherwise on a coil voltage across both ends of the primary coil. Multiple demodulating units are each configured to have respectively different configurations, to operate in parallel, to extract a demodulated component from the coil current ICOIL or otherwise from the coil voltage, and to generate baseband signals as demodulated signals. A signal processing unit employs a baseband signal that is correctly received, from among the multiple baseband signals generated by the multiple demodulating units, based on an error detection result obtained using a checksum.
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