Emergency D.C. power supply with the emergency state being indicated by polarity reversal
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United States of America Patent
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Apr 25, 1989
Grant Date -
N/A
app pub date -
Apr 25, 1988
filing date -
Apr 29, 1987
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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