Instantaneous voltage lowering detection device

Details Instantaneous voltage lowering detection device Instantaneous voltage lowering detection device

2006-04-25

2006-04-25

Deb, Anjan (Department: 2858)

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Analysis of complex waves

C324S076530, C327S037000

Reexamination Certificate

active

07034515

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 comparator7that 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).

REFERENCES:
patent: 3648070 (1972-03-01), Eicher
patent: 5512837 (1996-04-01), Ohnishi
patent: 6628125 (2003-09-01), Fazakas
patent: 6850237 (2005-02-01), Nakayama
patent: 2000-55947 (2000-02-01), None
patent: 2002-171690 (2002-06-01), None

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