Threshold detection in back-up power supply systems
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United States of America Patent
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Nov 16, 2010
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app pub date -
May 13, 2008
filing date -
Oct 22, 2003
priority date (Note) -
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Abstract
A threshold detection circuit includes, in one embodiment, a comparator having a first input connection for receiving a backup voltage from a backup power source, a second input connection for receiving a primary voltage from a primary power source, and an output connection for providing an output voltage; a first resistor and a first capacitor that are coupled in series between the first input connection and the output connection; and a second resistor that is coupled between the first input connection and the output connection, and that is coupled in parallel to the series of first resistor and the first capacitor.
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