Hi

Has anyone had any experience with high frequency DC welding circuits.

I've often wanted to experiment with making a DC welder, single phase
in(220V local), but large ferrite cores are hard to get hold of. Then the
other day, at the scrapyard (favourite haunt), I came across the output
section of a small DC welder. The output panel dial showed up to 160A, but
I was amazed to see that the main HF?? transformer had metal laminates. The
size was approximately 70mm x 70mm.

I thought iron laminates max-ed out at about 1KHz, which would never yield
that conversion, unless they're using Silicon steel, but I don't know how
common that is.

Further searching points to the likelyhood that the transformer is iron
laminate, switched at about 400Hz.
Also, the transformer found had only one primary winding, ie not a
push-pull as I would imagine.

Any ideas?

Regards
Roland Jollivet


JeM Electric cc
PO Box 1460
Kloof
3640
Kwazulu Natal
South Africa
Tel: +27 31 7024412
Fax: +27 31 7011674
Cell: +27 83 255 6017
Email: enquiries@caon.co.za

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