Power holdup circuit

Details Power holdup circuit Power holdup circuit

2005-04-12

2005-04-12

Nguyen, Matthew V. (Department: 2838)

Electricity: power supply or regulation systems

Input level responsive

Using a linearly acting final control device

Reexamination Certificate

active

06879140

ABSTRACT:
A power holdup circuit including a monitoring circuit and a power holdup circuit. The monitoring circuit includes an average voltage comparator and an absolute voltage comparator which cooperate to detect a voltage drop in the voltage supplied by the power supply. The monitoring circuit also includes a timer to determine the time period of the voltage dropout. If a predetermined voltage dropout event occurs, the monitoring circuit generates a control signal to a switching component which activates a holdup power source. The holdup power source includes an energy storage device that stores energy to maintain the supply voltage during dropout periods.

REFERENCES:
patent: 4811190 (1989-03-01), Keir et al.
patent: 5828207 (1998-10-01), Saadeh
patent: 6201721 (2001-03-01), Suranyi et al.
patent: 6504497 (2003-01-01), Jang et al.

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