Instantaneous voltage drop detector for DC power source

Details Instantaneous voltage drop detector for DC power source Instantaneous voltage drop detector for DC power source

1988-12-28

1991-01-01

Eisenzopf, Reinhard J.

Telecommunications

Transmitter

With electrical protection of transmitter circuit or operator

455127, 455343, H01Q 1112

Patent

active

049824430

ABSTRACT:
An instantaneous voltage drop detector includes a reset signal generating circuit which generates a low-level reset signal when a DC power voltage falls below a predetermined level. When the reset signal exists, an integrating circuit discharges the electric charge charged thereon in accordance with its time constant. If the reset signal disappears, i.e., the output of the reset signal generating circuit changes to a high level, a changing circuit rapidly charges the integrating circuit to avoid interference between instantaneous voltage drops which continuously occur at a short interval. The detector also includes a comparator which compares the output level of the integrating circuit with a reference level and a latch circuit (E/F) which latches the output of the comparator in response to the disappearance of the reset signal, i.e., in response to the positive-going edge of output of the reset signal generating circuit. With the foregoing construction, the instantaneous voltage drop detector can accurately distinguish the continuously occurred instantaneous voltage drops from a long-period voltage drop.

REFERENCES:
patent: 4242753 (1980-12-01), Dolikian et al.
patent: 4274132 (1981-06-01), Molyneux-Berry
patent: 4709404 (1987-11-01), Tamura et al.
patent: 4761824 (1988-08-01), Saito
patent: 4766580 (1988-08-01), Go et al.

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