Drill with solid state speed control

Details Drill with solid state speed control Drill with solid state speed control

2006-11-03

2009-02-10

Smith, Scott A. (Department: 3721)

Tool driving or impacting

Automatic control of power operated means

C173S176000, C173S217000

Reexamination Certificate

active

07487844

ABSTRACT:
A power tool includes solid-state motor control. The tool includes a solid state variable speed control signal generator for generating a variable speed control signal, a microcontroller for generating a pulse width modulated (PWM) signal corresponding to the variable speed control signal, a driver circuit for generating H-bridge driving signals corresponding to the PWM signal, and an H-bridge circuit for selectively coupling a motor to a power source in accordance with the H-bridge driving signals.

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