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:
Nov. 04, 2008
Filed:
Oct. 11, 2006
Michael K. Forster, White Hall, MD (US);
Jason K. Leh, Parkville, MD (US);
John C. Vanko, Timonium, MD (US);
Daniel R. Beers, Dallastown, PA (US);
Robert A. Usselman, Forest Hill, MD (US);
Zoran Mihailovic, Vestal, NY (US);
Michael K. Forster, White Hall, MD (US);
Jason K. Leh, Parkville, MD (US);
John C. Vanko, Timonium, MD (US);
Daniel R. Beers, Dallastown, PA (US);
Robert A. Usselman, Forest Hill, MD (US);
Zoran Mihailovic, Vestal, NY (US);
Black & Decker Inc., Newark, DE (US);
Abstract
A motor control module for a power tool includes a controller and a triac for controlling current to the given tool motor. The module includes a circuit within the controller for implementing a plurality of control methodologies related to synchronizing the module to the AC input signal, estimating average current flowing through the triac, compensating for amplifier offset to improve accuracy of current measurements in the module, and providing speed measurement and control for the tool motor using principles of hysteresis in a comparator of the controller. Additionally, the controller is configured to calibrate an oscillation calibration register therein.