Circuit, system and/or method for detecting an electrical connection between an electrical device and a power supply
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United States of America Patent
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Apr 28, 2015
Grant Date -
Apr 14, 2011
app pub date -
Oct 13, 2009
filing date -
Oct 13, 2009
priority date (Note) -
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status (Latency Note)
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Abstract
A circuit, a system and/or a method detect a passive electrical connection and/or an active electrical connection between an electrical device and a power supply. An integrity of the electrical connection between the electrical device and the power supply is monitored to determine if the electrical device may have access to power and/or to determine if the electrical device may be secure while on display. A high frequency AC signal is modulated onto a positive power rail between the electrical device and the power supply. Capacitance circuitry of the electrical device may remove the high frequency signal from the positive power rail. An absence of the high frequency signal on the positive power rail indicates that the electrical connection exists between the electrical device and the power supply. A presence of the high frequency signal on the positive power rail indicates that the electrical connection does not exist between the electrical device and the power supply.
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