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Sonsivri > Electronics > General Electronics (Moderators: o2, pickit2) > ac current regulation
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max
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« 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
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Taner
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« Reply #1 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
 Smiley
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8K51
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« Reply #2 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
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terval
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« Reply #3 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).
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AntiBG
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« Reply #4 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
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