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:
Sep. 15, 2009
Filed:
Aug. 08, 2007
Hitoshi Yabusaki, Londonderry, NH (US);
Alejandro G. Milesi, Ciudad de Buenos Aires, AR;
Shaun D. Milano, Chichester, NH (US);
Nevenka Kozomora, Manchester, NH (US);
Michael C. Doogue, Manchester, NH (US);
Hitoshi Yabusaki, Londonderry, NH (US);
Alejandro G. Milesi, Ciudad de Buenos Aires, AR;
Shaun D. Milano, Chichester, NH (US);
Nevenka Kozomora, Manchester, NH (US);
Michael C. Doogue, Manchester, NH (US);
Allegro Microsystems, Inc., Worcester, MA (US);
Abstract
In one aspect, a control circuit to control a speed of a motor includes a PWM oscillator configured to generate a PWM output signal having a duty cycle. The speed of the motor is controlled by the PWM output signal to be proportional to the duty cycle. The control circuit also includes a duty cycle control circuit responsive to a duty cycle selection signal and coupled to the PWM oscillator. The duty cycle control circuit is configured to compare a voltage reference and a supply voltage. The duty cycle control circuit controls the duty cycle of the PWM output signal to be inversely proportional to the supply voltage.