Electricity: electrical systems and devices – Safety and protection of systems and devices – Transient responsive
Patent
1990-04-26
1992-06-16
DeBoer, Todd E.
Electricity: electrical systems and devices
Safety and protection of systems and devices
Transient responsive
361113, 361118, 361119, 361120, H02H 322
Patent
active
051229218
ABSTRACT:
A device for suppressing electromagnetic static and voltage surges induced on radio frequency transmission cables is disclosed. The device comprises a blocking capacitor connected to prevent the conduction of DC currents but to permit the transmission of radio frequency signals. An inductor coil is connected between one side of the capacitor and ground. The inductor coil is of a value that blocks conduction of radio frequency signals but allows static and low frequency DC voltage surges to be conducted to ground. A gas discharge unit is also connected from the same side of the capacitor to ground. The discharge unit is a secondary discharge device that only operates when the transient speed and magnitude of the surge is sufficient to cause a back emf to develop across the inductor coil above a predetermined limit. The gas discharge unit assures that the capacitor is not damaged by the back emf. A resistor is connected between the other side of the capacitor and ground to discharge any DC voltage developed on the other side of said capacitor.
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Deboer Todd E.
Industrial Communication Engineers, Ltd.
Jackson S.
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