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:
Jun. 06, 2017
Filed:
Jul. 23, 2015
Applicant:
Yazaki Corporation, Tokyo, JP;
Inventors:
Yasutaka Wakasugi, Shizuoka, JP;
Takaaki Ishii, Shizuoka, JP;
Assignee:
Yazaki Corporation, Minato-ku, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H03K 3/00 (2006.01); H03K 3/2893 (2006.01); H03K 3/13 (2006.01); H03K 3/0233 (2006.01); H03K 3/037 (2006.01);
U.S. Cl.
CPC ...
H03K 3/2893 (2013.01); H03K 3/02337 (2013.01); H03K 3/0377 (2013.01); H03K 3/13 (2013.01);
Abstract
A Schmitt trigger circuit according to an embodiment includes a voltage dividing circuit that divides an input voltage and outputs a divided voltage, and a basic Schmitt trigger circuit that includes a transistor as a current controlling element and controls current flowing through a light emitting diode (LED) included in an external photocoupler on the basis of the output voltage of the voltage dividing circuit proportional to the input voltage. The voltage dividing circuit has a positive temperature coefficient.