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. 13, 1998
Filed:
Feb. 05, 1997
Applicant:
Inventors:
Assignee:
Omron Corporation, Kyoto, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H02K / ;
U.S. Cl.
CPC ...
318254 ; 318138 ; 318439 ; 318782 ; 388903 ;
Abstract
An inverting amplifier circuit generates a comparison voltage by comparing a smoothed voltage of a voltage across a semiconductor switching element and a setting voltage that is generated by device of a voltage setting volume. An operational amplifier generates a drive signal by comparing the above comparison voltage and a triangular voltage. Negative feedback is effected so that the setting voltage becomes equal to the smoothed voltage, which is inversely proportional to the rotation speed of a DC motor.