Self-tuning drive source employing input impedance phase detection
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United States of America Patent
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-
Jan 11, 2011
Grant Date -
Jun 26, 2008
app pub date -
Dec 20, 2006
filing date -
Dec 20, 2006
priority date (Note) -
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status (Latency Note)
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Abstract
An untethered device is configured to inductively couple to a source device. The source device includes a driver circuit configured to generate a varying magnetic field and comprising a drive coil circuit. A phase detector is coupled to the driver circuit and configured to detect a phase of an input impedance of the driver circuit in response to the source device inductively coupling with the resonant circuit of the untethered device. A controller is coupled to the phase detector and the driver circuit, and is configured to adjust a frequency of a source voltage applied to the driver circuit in response to an output signal of the phase detector. The controller adjusts the source voltage frequency so that the phase of the input impedance as indicated by the output signal of the phase detector is substantially zero.
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