Lightning protection circuit for digital subscriber loop interfa

Details Lightning protection circuit for digital subscriber loop interfa Lightning protection circuit for digital subscriber loop interfa

1984-06-20

1986-03-18

Moose, Jr., Harry E.

Electricity: electrical systems and devices

Safety and protection of systems and devices

High voltage dissipation

179170D, 179 2C, 361 56, 361 91, H02H 904

Patent

active

045772550

ABSTRACT:
A lightning protection circuit for a digital subscriber loop interface has a loop interface transformer primary, connected across the TIP and RING terminals of the DSL interface, with a split winding. The split primary windings are balanced to minimize induced secondary voltages in the event of common mode lightning signals. Matched TIP and RING resistors limit the lightning current flowing to lightning ground. Back-to-back zener diode pairs across each split winding, and a capacitor connecting the split windings, limit the voltage across the windings in the event of differential lightning signals. The capacitor absorbs most of the lightning energy, rather than the secondary windings or the resistors.
Back-to-back zener diode pairs across each secondary winding provide further lightning protection by limiting the energy absorbed by the transmit and receive circuitry. A resistor and diode configuration is used to protect the DSL interface analog switch and power supplies of the receive circuitry, and a diode may be used to protect the -5 volt power supply of the transmit circuitry.

REFERENCES:
patent: 1573068 (1926-02-01), Honaman
patent: 1979101 (1934-10-01), Dudley
patent: 3181033 (1965-04-01), Bakker
patent: 4232293 (1980-11-01), Harris
patent: 4289939 (1981-09-01), Arnold
patent: 4378472 (1983-03-01), Lechner
patent: 4471489 (1984-09-01), Konetski et al.

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