Electricity: electrical systems and devices – Safety and protection of systems and devices – Transient responsive
Patent
1989-10-16
1991-10-01
Deboer, Todd E.
Electricity: electrical systems and devices
Safety and protection of systems and devices
Transient responsive
361113, 333206, H02H 100
Patent
active
050539108
ABSTRACT:
A surge protection circuit for insertion into a coaxial cable system is configured as a coaxial structure of given characteristic impedance extending between matching input and output connection. A surge suppression network is built into the coaxial housing, and includes a shunt inductor shunting the center conductor at an intermediate point to the housing. A capacity is series-inserted into the output section of the center conductor beyond the inductor. The capacitor is a plate-shaped element metalized on both faces and edge-inserted into the confronting line sections of the center conductor and soldered thereto, so that capacitor lead inductance is incorporated into the center conductor. At the passband frequency of cable television communications the reactance of the inductor is high compared to the characteristic impedance, and similarly the reactnace of the capacitor is low, resulting in negligible insertion loss to the system. At the uppermost harmonic component frequency of line surges the low inductive reactance, and the high capactivie reactance cause strong attenuation of surge signals. A pair of diodes connected between the output sections of the center conductor of the coaxial line and the coaxial housing or outer conductor provides additional surge attenuation.
REFERENCES:
patent: 3602848 (1971-08-01), Leonard
patent: 3747030 (1977-07-01), Walding
patent: 4202594 (1980-05-01), Coleman et al.
patent: 4807083 (1989-02-01), Austin
patent: 4810980 (1989-03-01), Heston et al.
Deboer Todd E.
Perma Power Electronics, Inc.
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