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. 23, 2004
Filed:
Aug. 30, 2001
Toshiro Okubo, Kyoto, JP;
Rohm Co., Ltd., Kyoto, JP;
Abstract
A drive controller for brushless motors, comprising: a multiplicity of switching means each having a first switching element connected between a first power supply providing a first potential and an output terminal of the drive controller, and a second switching element connected between the output terminal and a second power supply providing a second potential; oscillator means for generating triangular signals; position signal generation means for generating sinusoidal position detection signals based on the signal detected by a position detector of the brushless motor; and comparator means for comparing the magnitudes of the triangular signals with the sinusoidal position detection signals to generate PWM signals. The first switching element and the second switching element of each switching means are turned ON/OFF alternately by the PWM signals. The mean potentials of the triangular signals and the sinusoidal position detection signals are set to the same potential.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile