Electricity: electrical systems and devices – Safety and protection of systems and devices – High voltage dissipation
Patent
1994-01-24
1994-10-18
Dwyer, James L.
Electricity: electrical systems and devices
Safety and protection of systems and devices
High voltage dissipation
361124, 379412, 337 32, H02H 320, H02H 308
Patent
active
053575687
ABSTRACT:
A telephone line overvoltage protection method and device are provided. An overvoltage protection apparatus used with a pair of telephone lines includes first voltage clamping circuitry for clamping voltage signals on the lines at a first predetermined voltage potential; second voltage clamping circuitry for clamping voltage signals on the lines at a second predetermined voltage potential. The second voltage clamping circuitry includes filter circuitry for filtering the voltage signals when the voltage signals exceed the second predetermined voltage signals. The first voltage clamping circuitry is formed by a solid state protective device and a failure mode mechanism adapted for connecting the lines to ground responsive to increased temperature of the solid state protective device.
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Dwyer James L.
Oneac Corporation
Weaver Scott L.
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