Electricity: motive power systems – Positional servo systems – Pulse-width modulated power input to motor
Reexamination Certificate
2005-07-19
2005-07-19
Masih, Karen (Department: 2837)
Electricity: motive power systems
Positional servo systems
Pulse-width modulated power input to motor
C318S600000
Reexamination Certificate
active
06919703
ABSTRACT:
A system may include a tachometer reading unit and a PWM (Pulse Width Modulated) signal generator configured to generate a PWM signal. The tachometer reading unit may be configured to obtain a tachometer reading from a tachometer signal generated by a device powered by the PWM signal. The tachometer reading unit includes a register configured to store a value indicative of a maximum stretching duration. The tachometer reading unit is configured to update the register in response to receiving a new value of the maximum stretching duration. The tachometer reading unit may be configured to control the PWM signal generator to stretch a pulse in the PWM signal and to not stretch the pulse longer than the maximum stretching duration indicated by the register. The tachometer reading unit is configured to obtain the tachometer reading during the stretched pulse in the PWM signal.
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Marando Eileen M.
Schoepflin Robert W.
Wahler Richard E.
Hood Jeffrey C
Masih Karen
Meyertons Hood Kivlin Kowert & Goetzel PC
Standard Microsystems Corporation
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