Electricity: motive power systems – Synchronous motor systems – Brushless motor closed-loop control
Reexamination Certificate
2006-10-11
2008-11-04
Masih, Karen (Department: 2837)
Electricity: motive power systems
Synchronous motor systems
Brushless motor closed-loop control
C318S700000, C318S727000, C318S400220
Reexamination Certificate
active
07446493
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.
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Beers Daniel R.
Forster Michael K.
Leh Jason K.
Mihailovic Zoran
Usselman Robert A.
Black & Decker Inc.
Harness & Dickey & Pierce P.L.C.
Masih Karen
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