35W resistive and capacitive half-wave phase-shift trigger doer control circuit Automatic or semi-automatic welding equipment in order to control the wire feeding, welding car
travel, requires the use of drive control circuit to meet the requirements of the welding process. (1) 35W blocking off half-wave phase-shift trigger drag the control circuit circuit is shown. Motor using 35W DC servo motor. By the potentiometer RPi, RPz and voltage divider consisting of RP4, RP4 is removed from the feedback voltage, superimposed on the AC voltage resistive and capacitive phase-shifting, to form a strong negative anti fed, stable speed control purposes. Adjust RP3, change the armature voltage, to achieve speed control purposes.