Device for detection of power-off
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United States of America Patent
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Oct 23, 2007
Grant Date -
Jun 23, 2005
app pub date -
Nov 24, 2004
filing date -
Dec 17, 2003
priority date (Note) -
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status (Latency Note)
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Abstract
A power-off detection device is formed without use of a photo coupler, which is expensive and occupies a relatively large area. The power-off detection device rectifies AC power, provided as external input power from a power supply device, into DC power, detects the power-off of the external input power from the power supply device as provided to an electronic appliance, provides a power-off detection signal to central control means of the electronic appliance, and enables the central control means to prepare for the power-off, thereby reducing manufacturing cost of the power supply device, and achieving miniaturization thereof.
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