Electricity: electrical systems and devices – Safety and protection of systems and devices – Load shunting by fault responsive means
Patent
1991-12-06
1993-09-07
DeBoer, Todd E.
Electricity: electrical systems and devices
Safety and protection of systems and devices
Load shunting by fault responsive means
361 91, 361111, 361119, H02H 904
Patent
active
052434885
ABSTRACT:
A circuit for protecting lines such as telephone lines against positive or negative overvoltages having respective determined minimum values (+V1 and -V2). Between a common point (C) and a first conductor (A), a second conductor (B) and ground (M), are inserted first, second and third protection components, respectively constituted by a diode (D1, D2, D3) in anti-parallel with a thyristor (T1, T2, T3), the anode of which is connected to the common point and the gate of which receives a polarization signal. The first and second thyristors are of the cathode-gate type and the third (T1) of the anode-gate type. Each of the first and second thyristors is associated with a transistor (TR2, TR3). The emitter of each transistor is connected to the gate of the corresponding thyristor and the collector of each transistor is connected to a second common point (D) connected to the gate of the third thyristor.
REFERENCES:
patent: 4282555 (1981-08-01), Svedberg
patent: 4390919 (1983-06-01), Lesinski
patent: 4695916 (1987-09-01), Satoh et al.
Bernier Eric
Pezzani Robert
Deboer Todd E.
SGS-Thomson Microelectronics S.A.
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