Voltage clamp
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United States of America Patent
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Apr 6, 2010
Grant Date -
Mar 25, 2010
app pub date -
Sep 19, 2008
filing date -
Sep 19, 2008
priority date (Note) -
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Abstract
An active over-voltage clamp system includes at least one over-voltage detector that is responsive to an input voltage and provides a first current. The system also includes a replica over-voltage circuit that provides a second current, and circuitry subtracting the second current from the first current to produce a difference current. The system further includes a differential clamp activated in response to the difference current. The differential clamp prevents the input voltage from increasing beyond a target voltage.
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