Switching device with a feeding circuit for DC power supply to a

Details Switching device with a feeding circuit for DC power supply to a Switching device with a feeding circuit for DC power supply to a

1995-04-13

1996-10-29

Hecker, Stuart N.

Electricity: power supply or regulation systems

Output level responsive

Using a three or more terminal semiconductive device as the...

323282, 361119, 379412, G05F 140

Patent

active

055700039

ABSTRACT:
The invention relates to a switching device comprising at least one feeding circuit provided for DC power supply to at least one subscriber's terminal unit. The feeding circuit is especially provided for digital subscribers' terminal units. The invention furthermore relates to the feeding circuit used. There is proposed to provide a first and a second limiting circuit. The first limiting circuit comprises a first series combination of a first supply transistor arrangement and a first supply resistor arrangement to limit a supply current flowing through the first series combination. The second limiting circuit comprises a second series combination of a second supply transistor arrangement and a second supply resistor arrangement to limit a supply current (Is) flowing through the second series combination. A potential (V0) present on the control input of the second supply transistor arrangement depends on the voltage (Ur) present on the first series combination.

REFERENCES:
patent: 4661879 (1987-04-01), Sato et al.
patent: 4876620 (1989-10-01), Borkowicz
patent: 4897872 (1990-01-01), Siligoni et al.
patent: 5315653 (1994-05-01), Siligoni et al.
European Telecommunication Standard ETS 300 012, pp. 155 to 167 Apr. 1992.

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