Instantaneous voltage lowering detection device
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United States of America Patent
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Apr 25, 2006
Grant Date -
Jan 19, 2006
app pub date -
Dec 19, 2003
filing date -
Jun 5, 2003
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An instantaneous voltage dip detection device is provided with: all-pass filter (2) for phase shifting a supply voltage waveform (11) by 90°; a comparator 7 that outputs a signal when the supply voltage waveform (11) is smaller than a threshold (12) in regions of π/4 to 3π/4, 5π/4 to 7π/4; a comparator (8) that outputs a signal when a phase shift voltage waveform (13) is smaller than a threshold (14) in regions of 0 to π/4, 3π/4 to 5π/4, 7π/4 to 2π; an OR circuit (9) to which signals from the comparators (7), (8) are inputted; and a signal generator (10) for generating a voltage dip detection signal in response to an output from the OR circuit (9).
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