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:
Aug. 05, 1980
Filed:
Feb. 15, 1979
August A Divjak, Waukesha, WI (US);
Peter Miczek, Milwaukee, WI (US);
Johnson Controls, Inc., Milwaukee, WI (US);
Abstract
A solid state motor control circuit for controlling the operation of a servo motor comprises a comparator circuit including a differential amplifier having its inputs connected across terminals of the motor and having its output connected to a drive circuit the output of which is connected to a supply terminal of the motor. A reference circuit maintains a reference terminal of the motor at a reference level, and in the absence of a command signal, the differential amplifier and drive circuit maintain the voltage at the motor supply terminal at the reference level. A control switch enabled by the command signal applies a control signal to an input of the differential amplifier, and the differential amplifier responsively enables the drive circuit to raise or lower the potential at the motor supply terminal relative to the reference level, thereby energizing the motor. Upon termination of the command signal, the control switch is disabled, removing the control signal from the input of the differential amplifier and through negative feedback, the differential amplifier and drive circuit return the voltage at the motor supply terminal to the reference level, approximating a dynamic braking function for stopping the motor.