Method and apparatus for selectively maintaining circuit power when higher voltages are present
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United States of America Patent
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Mar 2, 2010
Grant Date -
N/A
app pub date -
Jan 17, 2002
filing date -
Jan 26, 2001
priority date (Note) -
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Abstract
A method and apparatus for detecting the presence of a specified voltage source and automatically switching off a second voltage source regardless of voltage source potential of the two voltage sources are disclosed. The present invention uses pinch-off of a JFET, controlled by an inverter, to control a backup power supply based on the availability of the main supply.
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