Emergency D.C. power supply with the emergency state being indic

Details Emergency D.C. power supply with the emergency state being indic Emergency D.C. power supply with the emergency state being indic

1988-04-25

1989-04-25

Salce, Patrick R.

Electric power conversion systems

Current conversion

Including automatic or integral protection means

307 64, 307 66, 379387, 379413, H02J 906, H02H 700

Patent

active

048253499

ABSTRACT:
This power supply is intended, more particularly, for powering a user digital terminal from a remote terminal in an integrated service digital telephone network. It comprises a main D.C. electricity power source (10) provided with a protection device (11) causing its output to go to a high impedance state in the absence of a voltage across its terminals, and an auxiliary D.C. electricity power source (20) connected in parallel and in opposition with the main source (10) and provided with a current limiting device (20) which is normally tripped by the additional current which the main source (10) attempts to impose thereon.

REFERENCES:
patent: 4636588 (1987-01-01), Nakayama et al.
patent: 4647787 (1987-03-01), Pommer, II
patent: 4745299 (1987-05-01), Eng et al.
patent: 4763013 (1988-08-01), Gvoth, Jr. et al.
patent: 4763014 (1988-08-01), Model et al.
Conference Proceedings, Intelec 85, Seventh International Telecommunications Energy Conference Munich, Oct. 14-17, 1985, Conf. 7, pp. 513-519, IEEE, N.Y., USA; W. Krautkramer et al: "Remote Power Feeding of ISDN-Terminals at the Basic Access", p. 516, line 1--page 519, last line.
Patent Abstracts of Japan, vol. 9, No. 85 (E-308) (1908), Apr. 13, 1985; & JP-A-59 215 170 (Nippon Deshin Denwa Kosha), Dec. 5, 1984.

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