Digital voltage and phase monitor for AC power line

Details Digital voltage and phase monitor for AC power line Digital voltage and phase monitor for AC power line

1992-03-03

1994-06-07

Voeltz, Emanuel T.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Circuit automatically reconnected only after the fault is...

361 75, 361 85, 361 86, 361 90, 340662, 363 53, H02H 324

Patent

active

053195140

ABSTRACT:
A digital voltage protection circuit (138) and a phase monitor circuit (154, 160, 162, 168) disconnect AC-powered user equipment (22,182) from the AC power supply (141) whenever the AC power line voltage is outside a predetermined operating voltage window and when any two phases of the power supply (141) are separated by more than a predetermined phase angle. The user equipment (182) is automatically reconnected to the power supply (141) only after the power line voltage and phase remain continuously within operating range for a predetermined delay period. The voltage monitor (138) contains a digital comparator (18) that uses integrated circuit digital logic thresholds as reference voltages for setting upper and lower voltage window limits. The controller protects the user equipment from both over-voltage and under-voltage (brownout) conditions and from phase errors.

REFERENCES:
patent: 4306265 (1981-12-01), Kuntner et al.
patent: 4331995 (1982-05-01), Voss
patent: 4346307 (1982-08-01), Zulaski
patent: 4562507 (1985-12-01), Kudo et al.
patent: 4567552 (1986-01-01), Hirose
patent: 4616324 (1986-10-01), Simmel
patent: 4999730 (1991-03-01), Pickard
patent: 5126678 (1992-06-01), Williams

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