The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 25, 2006
Filed:
Dec. 19, 2003
Yasufumi Shimoe, Tokyo, JP;
Yoshihiro Hatakeyama, Tokyo, JP;
Yasufumi Shimoe, Tokyo, JP;
Yoshihiro Hatakeyama, Tokyo, JP;
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Abstract
An instantaneous voltage dip detection device is provided with: all-pass filter () for phase shifting a supply voltage waveform () by 90°; a comparatorthat outputs a signal when the supply voltage waveform () is smaller than a threshold () in regions of π/4 to 3π/4, 5π/4 to 7π/4; a comparator () that outputs a signal when a phase shift voltage waveform () is smaller than a threshold () in regions of 0 to π/4, 3π/4 to 5π/4, 7π/4 to 2π; an OR circuit () to which signals from the comparators (), () are inputted; and a signal generator () for generating a voltage dip detection signal in response to an output from the OR circuit ().