The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 06, 2001
Filed:
Sep. 02, 1999
Joao Carlos F. Brito, Richardson, TX (US);
John K. Rote, Dallas, TX (US);
Robert E. Whyte, Jr., Dallas, TX (US);
Texas Instruments Incorporated, Dallas, TX (US);
Abstract
An apparatus for controlling an actuator in response to a target speed voltage signal, the actuator having a moveable member and having a coil that influences movement of the member. A first summing node is provided having a control output voltage, for summing or subtracting voltages applied thereto, as the case may be and receiving the target speed voltage signal at a first, summing input thereto. A proportional compensation unit is provided, receiving the control output voltage and providing as an output a proportionally compensated output signal. An integral compensation unit is provided, receiving the control output voltage and providing as an output an integrally compensated output signal. An inverse compensation unit is provided, receiving the target speed voltage signal as an input and providing an inversely compensated output signal having a voltage corresponding to the voltage of the target speed voltage signal multiplied by the inverse of a predetermined amplification factor. A second summing node is provided, receiving the proportionally compensated output signal, the integrally compensated output signal and the inversely compensated output signal, and having a command output signal corresponding to the sum of the input signals. An amplifier is provided, receiving the command output signal and having a drive output signal for driving the actuator. Finally, a sense unit is provided for sensing a back-EMF of the actuator and providing a voltage corresponding to the sensed back-EMF to a second, subtracting input of the first summing node, such that the control output voltage corresponds to the difference between the target speed voltage and the sensed back-EMF. The inversely compensated output signal substantially provides a voltage to the amplifier sufficient to cause the amplifier to provide the drive output signal at a voltage corresponding to the voltage of the target speed voltage signal.