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:
Jul. 12, 2016
Filed:
Sep. 19, 2014
Applicant:
Rohm Co., Ltd., Kyoto, JP;
Inventor:
Shigeru Hirata, Kyoto, JP;
Assignee:
Rohm Co., Ltd., Kyoto, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H03L 7/00 (2006.01); H02P 6/16 (2016.01);
U.S. Cl.
CPC ...
H02P 6/16 (2013.01);
Abstract
A motor driving device includes a clock oscillator configured to generate a clock signal; and a logic unit configured to receive the clock signal, control conduction of a 3-phase brushless direct current (DC) motor, and generate a revolutions per minute (RPM) detection signal. The clock oscillator is configured to switch an oscillation frequency of the clock signal depending on an RPM command signal input to set a target RPM of the 3-phase brushless DC motor.