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:
Jan. 10, 2017
Filed:
Jul. 14, 2014
Fuji Electric Fa Components & Systems Co., Ltd., Tokyo, JP;
Toshio Nodera, Tochigi, JP;
Yasuhiro Takahashi, Kounosu, JP;
Takashi Hashimoto, Ohtawara, JP;
Yohei Hosooka, Ohtawara, JP;
FUJI ELECTRIC FA COMPONENTS & SYSTEMS CO., LTD., Tokyo, JP;
Abstract
A current detecting device includes an exciting coil () wound around a magnetic core () enclosing a conductor through which flows a measurement current, and an oscillator circuit () that generates a square wave voltage which is supplied to the exciting coil (). Furthermore, the current detecting device includes a duty detector circuit () that detects the measurement current based on variation in the duty ratio of the square wave voltage output from the oscillator circuit (), a frequency detector circuit () that detects an overcurrent of the measurement current based on the frequency of the square wave voltage output from the oscillator circuit (), and an oscillation amplitude detector circuit () that detects an overcurrent of the measurement current based on the magnitude of the square wave voltage output from the oscillator circuit ().