Power failure protector circuit

Details Power failure protector circuit Power failure protector circuit

1984-03-30

1985-07-16

Salce, Patrick R.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific voltage responsive fault sensor

361 89, 307200A, 340663, H02H 324

Patent

active

045300275

ABSTRACT:
A power failure protector circuit prevents spurious output signals from an electronic circuit when power to the electronic circuit is interrupted. The output of the electronic circuit is effectively blocked by a switch. The switch is turned off when the power supply is turned on and remains off until the power supply is interrupted. A capacitor is normally charged to the operating voltage of the power supply and when the power supply is interrupted, the capacitor discharges to turn the switch on during the interval when the operating voltages of the electronic circuit are decaying. The capacitor also provides a power source to maintain the operating voltages of the electronic circuit near normal for a short interval after the power supply is interrupted thus insuring correct operation of the electronic circuit until after the switch is turned on and the output from the circuit is blocked.

REFERENCES:
patent: 3383522 (1968-05-01), Apfelbeck et al.
patent: 3562555 (1971-02-01), Ahrons
patent: 3657603 (1972-04-01), Adams
patent: 3784846 (1974-01-01), Krick
patent: 4117526 (1978-09-01), Bates

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