Tool driving or impacting – Processes
Reexamination Certificate
2011-01-04
2011-01-04
Smith, Scott A. (Department: 3721)
Tool driving or impacting
Processes
C173S002000, C173S176000, C173S213000, C173S217000
Reexamination Certificate
active
07861796
ABSTRACT:
A method of operating a hand power tool in one embodiment includes generating a variable speed control signal with a solid state switch that corresponds to a selected speed for a motor, generating a pulse width modulated (PWM) signal corresponding to the variable speed control signal, generating H-bridge driving signals for an H-bridge circuit in correspondence with the PWM signal, and selectively coupling a motor to a power source using the H-bridge circuit in accordance with the H-bridge driving signals.
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DeCicco John
Kovarik Illya
Pozgay David
Maginot Moore & Beck
Robert & Bosch GmbH
Smith Scott A.
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