Electricity: motive power systems – Positional servo systems – With signal- – voltage- – or current-limiting
Reexamination Certificate
2006-09-12
2006-09-12
Ip, Paul (Department: 2837)
Electricity: motive power systems
Positional servo systems
With signal-, voltage-, or current-limiting
C318S254100, C318S560000, C360S077060
Reexamination Certificate
active
07106022
ABSTRACT:
A control apparatus controls retraction of a device carried on a moveable member actuated by an electric motor. The control apparatus includes a measuring circuit with an output during a measuring phase including a back electromotive force (back EMF) from the electric motor plus a measuring circuit offset voltage. The control apparatus also includes an offset removing circuit connected to the output of the measuring circuit. The back EMF from the electric motor is provided at the output of the offset removing circuit. A driver circuit is connected to terminals of the electric motor for providing the electric motor with a drive current during a driving phase with a magnitude based on the back EMF from the electric motor.
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Brenden Jason P.
Dahlberg James A.
Agere Systems Inc.
Ip Paul
Kinney & Lange , P.A.
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