Low capacitance protection circuit for telephone equipment

Details Low capacitance protection circuit for telephone equipment Low capacitance protection circuit for telephone equipment

1993-08-23

1995-06-06

Hoff, Marc S.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Load shunting by fault responsive means

361 91, 361111, 361118, H02H 320, H02H 904

Patent

active

054227771

ABSTRACT:
An overvoltage protection circuit comprises three protection components (21, 22, 23) connected by their first terminal to a common point (C) and by their second terminal to a first conductor (A), second conductor (B) and ground, respectively. Each protection component comprises the anti-parallel association of a protection component (T1, T2, T3) and a diode (D1, D2, D3), the common point being connected to a same polarity terminal of each protection component. In case one of the conductors exhibits, at the normal state, a polarization difference higher than the other with respect to ground, the cathodes or anodes of the protection components are connected to the common point according as the higher polarized conductor is negative or positive with respect to ground.

REFERENCES:
patent: 4282555 (1981-08-01), Svedberg

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