Power abnormal protection circuit

Details Power abnormal protection circuit Power abnormal protection circuit

2007-06-05

2009-02-24

Sherry, Michael J (Department: 2836)

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific voltage responsive fault sensor

Reexamination Certificate

active

07495875

ABSTRACT:
A power abnormal protection circuit includes a power detection unit, a voltage drop correction unit, a drop out detection unit, a delay unit and a delay masking unit. By detecting an input power average value of a power supply occurring of a brown out condition can be determined. The power supply includes a power factor correction unit which has an output capacitor. By detecting the voltage of the output capacitor a drop out condition can be determined. When a power abnormal condition occurs all units of the power supply can be set off sequentially according to a delay time to protect circuit elements and a connecting computer.

REFERENCES:
patent: 5765001 (1998-06-01), Clark et al.
patent: 6445089 (2002-09-01), Okui
patent: 6949915 (2005-09-01), Stanley
patent: 501830 (2002-09-01), None

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