Electricity: electrical systems and devices – Safety and protection of systems and devices – With specific quantity comparison means
Patent
1997-05-30
1999-06-29
Leja, Ronald W.
Electricity: electrical systems and devices
Safety and protection of systems and devices
With specific quantity comparison means
361 93, H02H 318
Patent
active
059176903
ABSTRACT:
A regulated power supply for application in a cable signal distribution amplifier comprises a filter, voltage doubler and current sense transformer controlled by a control technique known in the art. In the event of a high impedance short condition causing severe overcurrents, the known control technique is ineffective. To alleviate the problem, a high impedance current fault control circuit includes a sampling circuit, a level adjusting circuit, a differential amplifier for providing a monitor output control voltage and a buffer circuit to the controller. In the event of a high impedance current fault, the control circuit kicks in and interrupts controller operation saving power supply components from damage caused by the overcurrent condition.
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Barnhardt III Hubert J.
Gardner Kelly A.
Leja Ronald W.
Massaroni Kenneth M.
Scientific-Atlanta, Inc.
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