Hi,
I have an old single phase 230V welding transformer. it's output welding current is determined by choosing one of the four current ranges. it has taps - not the moving core type. I would like to convert it so that it will be a dc output welder and to add a control circuit that will be able to set the output current continuously by using a potentiometer from zero (or almost zero), to it's max capacity - 150A. from what I have seen, it's generally done by using a bridge of scr's. I've seen on Aliexpress that they are offered at a reasonable price. so, the main obstacle is the control circuit that will drive the gates of the scr's. looking forward for your advise and circuit.
I have an old single phase 230V welding transformer. it's output welding current is determined by choosing one of the four current ranges. it has taps - not the moving core type. I would like to convert it so that it will be a dc output welder and to add a control circuit that will be able to set the output current continuously by using a potentiometer from zero (or almost zero), to it's max capacity - 150A. from what I have seen, it's generally done by using a bridge of scr's. I've seen on Aliexpress that they are offered at a reasonable price. so, the main obstacle is the control circuit that will drive the gates of the scr's. looking forward for your advise and circuit.
