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Title: ac current regulation Post by: max on November 20, 2007, 04:13:50 04:13 hi,
i need to regulate the ac current in a spot welding machine, any idea? thanks Title: Re: ac current regulation Post by: Taner on November 20, 2007, 03:04:54 15:04 Hi,
what kind of regulation you want to use, by the mean value or by the instant value of the current. You can use a IC regulator like TL494 ot SG3524 with proper feedbacks. Best regards: Taner :) Title: Re: ac current regulation Post by: 8K51 on November 20, 2007, 08:44:04 20:44 Hi
If your 'spot welding' machine uses power from mains and a big transformer to put low voltage/high current in welding electrodes the eaysiest way is to monitor current in electrodes (secondary side) and use this as feedback for a primary side control. (triac with phase angle command) Are trying to reduce current as metal begin to liquefy ? Regards Title: Re: ac current regulation Post by: terval on November 20, 2007, 09:03:48 21:03 Tell me voltage primary(of course AC) , secundary(of course DC) and Amps you need for that,maybe using igbt to output.You will need one circuit to prevent from direct contact (some miliomhs).
Title: Re: ac current regulation Post by: AntiBG on November 20, 2007, 11:52:31 23:52 view this pdf
http://www.onsemi.com/pub/Collateral/AND8042-D.PDF. It approximates what you want |