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Subject: Switching a bridge rectifier in/out high current AC for selectable output

Date: 10/11/03 at 12:45 AM
Posted by: jovanes
E-mail: jovanes[AT55]hotmail.com (replace [AT55] with @ to reply)
Message Posted:

Hi all,
I have been building my own welder from some hefty transformers 110v pri. / 14v,0v,14v sec. ??? current. The pri winding is #8 round wire, sec windings are #6 square wire and a CT of 3/4" copper strap. I am interested in switching a bridge rectifier in/out of the circuit after the transformers (2 in parallel) for selectable output between AC/DC. Also swap the polarity. I don't like mounting big fat switches (relays and contactors included), and it seems that some arrangement of BIG SCR’s and diodes instead of just BIG diodes (maybe 4 SCR’s and 2 diodes?), should rectify the AC and control switching. It seems I have seen this arrangement before, but I cannot recall. If anyone has experience with this or knows of a suitable circuit, I would appreciate it. BTW weight is a consideration, all ready, welding involves hefty metal objects. :-)

TIA, jappee

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