AC balance in Transformer machines.

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I think I read it here, but maybe I imagined it, I thought a Syncrowave, (maybe others), old school transformer machines with squarewave, and AC balance controls used "chopper" switching to clip a portion of the workpiece negative part of a cycle to control ac balance. How is it done? How do they produce squarewave without an inverter? I have an old book by Linde they talk about the newly introduced machine with squarewave. I'll look up the printing date, it's early!
Reply:I do not know If this page will help you or not, http://yodermfg.com/products/default...W#.U09PhFJOX5ohttps://www.google.com/search?tbm=pt...-wave+welder&=Last edited by Farmerboy; 04-17-2014 at 12:02 AM.