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:
Aug. 10, 1993
Filed:
May. 29, 1991
Applicant:
Inventor:
Atsuyuki Hiruma, Fuji, JP;
Assignee:
Kabushiki Kaisha Toshiba, Kawasaki, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H02H / ;
U.S. Cl.
CPC ...
363 56 ; 363 37 ; 323902 ; 361111 ;
Abstract
There are provided a resistor having a low resistance and inserted in a d.c. current path of which an overcurrent is detected, and a bias circuit for generating substantially a constant d.c. voltage. A voltage obtained by superposing a voltage across the resistor upon a voltage supplied from the bias circuit is monitored. When the monitored voltage reaches a predetermined threshold value, an overcurrent detection signal is generated by means of a photocoupler.