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:
Mar. 04, 2003
Filed:
Mar. 08, 2002
Applicant:
Inventors:
Toshiaki Seima, Tottori-ken, JP;
Yoshiaki Iwayama, Osaka-fu, JP;
Assignee:
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H02P 5/40 ;
U.S. Cl.
CPC ...
H02P 5/40 ;
Abstract
In a driver of a brushless motor performing synchronous rectification PWM operation, switching is performed at an arbitrary timing between a synchronous rectification PWM operation and one-way PWM operation to prevent a negative current for the power supply, and thus preventing increase of a power supply voltage due to the negative current, thereby implementing high performance and high reliability.