Protective circuit for a subscriber line circuit and a subscribe

Details Protective circuit for a subscriber line circuit and a subscribe Protective circuit for a subscriber line circuit and a subscribe

1995-01-11

1996-07-16

Deboer, Todd

Electricity: electrical systems and devices

Safety and protection of systems and devices

High voltage dissipation

361127, 361 56, H02H 322

Patent

active

055372872

ABSTRACT:
Protective circuit with a threshold circuit for discharging overvoltage surges to ground and with a low-value resistor positioned in a line wire at the subscriber's end meets a higher level of lightning protection by connecting a voltage-limiting component (V1, V2) in parallel with the low-value resistor (R1, R2). Such may a varistor connected in parallel with each of the series low-value feed or sensing resistors. The invention meets symmetry requirements, places low voltage requirements on low-value resistors and preceding parallel components, makes use of inexpensive voltage-limiting components and thereby results in cost saving.

REFERENCES:
patent: 4720845 (1988-01-01), Lechner et al.
patent: 5388021 (1995-02-01), Stahl
"Protection of Subscriber Line Interface Circuits", T. Kobayashi et al, NEC Research & Development (1987) Jul., No. 86, Tokyo, Japan, pp. 81-90.

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