H - Electricity – 01 – F
Patent
H - Electricity
01
F
318/1
H01F 7/18 (2006.01)
Patent
CA 1107814
TITLE ELECTRICAL CONTROL CIRCUIT FOR CONTROLLING A D.C. SOLENOID ABSTRACT OF THE DISCLOSURE Improvement in an electrical control circuit for controlling a D.C. solenoid having a plunger and a manual control potentiometer, a feedback potentiometer and a comparator for comparing the signal voltages from the two potentiometers so that the movement of the plunger of the solenoid is proportional to the movement of the wiper of the manual potentiometer, the feedback potentiometer being controlled by the movement of the plunger of the solenoid, the improvement comprising an arrangement for feeding the output signal from the feedback potentiometer to the comparator, a digital computer control circuit capable of receiving binary digital input signals and converting them to analog variable signal voltages, an arrange- ment for selecting one or the other of the manual and computer controls for the solenoid including a switch for switching between them so that the output signal from either one thereof is fed to the comparator for comparison with the signal from the feedback potentiometer, an arrangement for isolating between ground and a fixed D.C. voltage source the signal voltages from the manual potentiometer so that the voltage swing thereof is between predetermined minimum and maximum voltages, an arrangement for isolating between ground and a fixed D.C. voltage source the signal voltages from the computer circuit so that it produces a signal voltage swing comparable to that of the manual control, the two isolating arrangements being independent of each other such that the manual potentiometer is non-functional during operation of the computer control, and an arrangement for calibrating each voltage swing against a pre-determined reference.
315773
Almo Manifold And Tool Company
Kirby Eades Gale Baker
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