AC electric welding machine no-load energy-saving circuit

Published:2011/4/6 4:11:00 Author:Nicole | Keyword: electric welding machine, energy-saving | From:SeekIC

As shown in the figure, T1 is AC electric welding machine transformer. The power switch HK turns on, power transformer T2 obtains the electricity first, filter capacitor C1 obtains about 12V AC voltage. IC1, IC2 is two 555 time base IC. Because the voltage of initial state C2 is 0, the ②、⑥ pins of IC1 is low level, so ③ pin is high level, relay K is not pull-in, AC contactor KM is not work, electric welding machine is no energizing. At the same time, the multivibrator composed of IC2 starts working, the output frequency of ③ pin is about 10kHz pulse singal. After through R5, the later singal is added to one end of T1 secondary, the other end is connected to the grouding of control circuit, duing to T1 secondary winding has large inductance about 10kHz singal, so the current of this loop is lower, the voltage of transformer L is lower too. the other singal is coupled to C4, after VDR、VD9 rectifiers, C5 filter, the DC voltage turns VT1 on, VT2 off. So C2 is without charge current, IC1③ pin keeps high level. The circuit is in no-load energy-saving state.



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