Drill with solid state speed control
First Claim
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1. A hand power tool having solid state motor control comprising:
- a moveable member having a reflective surface and the moveable member traversing a distance between a stop position and a full speed position;
a biasing member operatively coupled to the moveable member to bias the moveable member toward the stop position;
an optical signal generator for generating an optical signal, the optical signal generator being oriented so that the optical signal is directed toward the reflective surface of the moveable member;
a speed control signal generator for generating a variable speed control signal that corresponds to a reflection of the generated optical signal reflected by the reflective surface of the moveable member;
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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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.
121 Citations
7 Claims
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1. A hand power tool having solid state motor control comprising:
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a moveable member having a reflective surface and the moveable member traversing a distance between a stop position and a full speed position; a biasing member operatively coupled to the moveable member to bias the moveable member toward the stop position; an optical signal generator for generating an optical signal, the optical signal generator being oriented so that the optical signal is directed toward the reflective surface of the moveable member; a speed control signal generator for generating a variable speed control signal that corresponds to a reflection of the generated optical signal reflected by the reflective surface of the moveable member; 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. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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Specification