SPLIT_PHASE_CONTROL_WITH_BRAKING

Published:2009/7/7 4:55:00 Author:May | From:SeekIC

Use of CMOS logic to gate direction-controlling triacs and turn on SCR for braking provides lowcost switchless control of split-phase motor used In place of brush-type DC motor Aρplications include control of ball valves and other throtting functions in process control With shaft-position encoders, circuit generates feed-back information. Overshoot and other stability problems are easily controlled by strong braking function. CMOS logic provides complete noise immunity. Oscillator pulse width is adjusted with 1K resistor in series with 1N914, and brake duration is controlled by 1-megohm resistor at input of U2C. With values shown, brake is applied for about 1 s. Circuit works reliably on supply voltages of 5 to 15 V.-V. C. Gregory, Split-Phase Motor Control Accomplished with CMOS, EDN Magazine, 0ct. 5, 1974 p 65-67.



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