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:
Oct. 14, 2014
Filed:
May. 21, 2012
Hiroyuki Shirakawa, Fuchu, JP;
Yusuke Yanagihashi, Tokorozawa, JP;
Hiroyuki Maehara, Fuchu, JP;
Toshio Tanaka, Ome, JP;
Noriyoshi Suga, Hachioji, JP;
Itsuo Shuto, Hachioji, JP;
Hiroyuki Shirakawa, Fuchu, JP;
Yusuke Yanagihashi, Tokorozawa, JP;
Hiroyuki Maehara, Fuchu, JP;
Toshio Tanaka, Ome, JP;
Noriyoshi Suga, Hachioji, JP;
Itsuo Shuto, Hachioji, JP;
Kabushiki Kaisha Toshiba, Tokyo, JP;
Abstract
According to one embodiment, there is provided a protection relay. The protection relay includes an input circuit that detects a state of an external device according to whether or not an external input voltage is larger than a preset threshold voltage. The input circuit includes switching unit that is made conductive by a divided voltage obtained by voltage-dividing resistors that divide the external input voltage when the external input voltage is higher than or equal to the threshold voltage, and a photocoupler that is operated by a constant current of a constant current output circuit supplying a constant current and outputs an operation signal to the operation unit when the switching unit is made conductive.