Electricity: electrical systems and devices – Safety and protection of systems and devices – With specific quantity comparison means
Patent
1987-04-28
1988-05-03
Pellinen, A. D.
Electricity: electrical systems and devices
Safety and protection of systems and devices
With specific quantity comparison means
361 92, 307129, 307130, H02H 350
Patent
active
047424249
ABSTRACT:
A power status monitor for an electronic system includes a charge/discharge model of the system power supply. The charge/discharge model contains an estimate of the amount of time during which energy-storage devices in a system DC power supply are capable of maintaining system operation following loss of AC power. The power status monitor monitors the frequency and an amplitude of the voltage of the AC power source for signs indicating imminent failure of the AC power source. In the event that such signs are detected, the estimate in the charge/discharge model is decremented at a rate corresponding to the rate at which charge is consumed. A trip value, applied to the charge/discharge model, determines the time at which a signal is generated enabling an orderly shutdown of the system load. If acceptable AC power is resumed before the trip value is reached, the charge/discharge model increases its estimate of the time available at a rate corresponding to the charge accumulation in the DC power supply.
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Kautzer Jeffrey A.
Mewitz Gerd
Nonnweiler Edward D.
Yates David C.
General Electric Company
Jennings Derek
Morrison Thomas R.
Pellinen A. D.
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