Protection circuit
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United States of America Patent
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Issued Date -
Feb 28, 2008
app pub date -
Jul 26, 2007
filing date -
Jul 27, 2006
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A transistor is coupled to a load so that an input voltage is applied to the load therethrough. A comparator compares a load-side voltage of the transistor with a reference voltage. A control circuit is operable to deactivate the transistor when the comparator detects that the load-side voltage is lower than the reference voltage. A restoring resistor is connected between an emitter and a collector of the transistor in a parallel manner, so that a feeble current flows in the load even when the transistor is deactivated by the control circuit.
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