Telephone and data overvoltage protection apparatus including a

Details Telephone and data overvoltage protection apparatus including a Telephone and data overvoltage protection apparatus including a

1997-05-27

1999-05-18

Medley, Sally C.

Electricity: electrical systems and devices

Safety and protection of systems and devices

High voltage dissipation

361113, H02H3/20

Patent

active

059056231

ABSTRACT:
A method and apparatus are provided for protecting a pair of telephone lines and similar data communication channels from overvoltage and transients. A filter for filtering noise and transient voltage signals above desired data signals on telephone lines and similar data communication channels includes a longitudinal transformer. The longitudinal transformer includes a single transformer core and a pair of coils. A first one of the coils is connected in series with a first telephone line or a first similar data communication channel. A second one of the coils is connected in series with a second telephone line or a second similar data communication channel. The pair of coils are substantially identical; each coil having an identical number of turns. A high impedance is provided with the longitudinal transformer to noise and transient voltage signals above desired data signals. A low impedance is provided with the longitudinal transformer to desired data signals.

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PROTECTION OF ELECTRONIC CIRCUITS FROM OVERVOLTAGES, Ronald B. Standler, 1989, pp. 176-177 and 246-247.

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