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Posted by Jon Danniken on April 28, 2008, 3:30 pm
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Hey Iggy,
I am in the process of converting my buzzbox to something resembling a 150A
TIG supply. I already have the AC-DC section figured out, as well as the HF
area.
I believe you used SCRs in a circuit you used to control the output current
of one of your machines, and I am very interested in this. Do you by any
chance have a schematic of this section of your circuit, and/or any other
reference schematics of going about this topology for a high current supply?
Thanks for your help,
Jon
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Posted by Ignoramus18948 on April 28, 2008, 4:06 pm
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> Hey Iggy,
>
> I am in the process of converting my buzzbox to something resembling a 150A
> TIG supply. I already have the AC-DC section figured out, as well as the HF
> area.
What is your OCV?
> I believe you used SCRs in a circuit you used to control the output
> current of one of your machines, and I am very interested in this.
> Do you by any chance have a schematic of this section of your
> circuit, and/or any other reference schematics of going about this
> topology for a high current supply?
>
Jon, I have some documentation along with parts pictures, sample
welds, etc, here:
http://igor.chudov.com/projects/Welding/11-New-Rectifier/
If your welder is single phase (mine is 3 phase), it changes a lot due
to ripple.
All together, this was a moderately expensive project and I would be
better off just buying a nice welder. It was fun, but very time
consuming.
I also post the source code of my welder, written in BASIC, here:
http://igor.chudov.com/projects/Welding/11-New-Rectifier/source.txt
It is under GPL, so feel free to do whatever you want with it, as long
as you keep it free software.
i
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Posted by Jon Danniken on April 28, 2008, 5:34 pm
Please log in for more thread options "Ignoramus18948" wrote:
> , Jon Danniken wrote:
>> Hey Iggy,
>>
>> I am in the process of converting my buzzbox to something resembling a
>> 150A
>> TIG supply. I already have the AC-DC section figured out, as well as the
>> HF
>> area.
>
> What is your OCV?
80V on the low range, for AC. I'll probably lose a bit after it goes
through the bridge.
>> I believe you used SCRs in a circuit you used to control the output
>> current of one of your machines, and I am very interested in this.
>> Do you by any chance have a schematic of this section of your
>> circuit, and/or any other reference schematics of going about this
>> topology for a high current supply?
>>
>
> Jon, I have some documentation along with parts pictures, sample
> welds, etc, here:
>
> http://igor.chudov.com/projects/Welding/11-New-Rectifier/
>
> If your welder is single phase (mine is 3 phase), it changes a lot due
> to ripple.
>
> All together, this was a moderately expensive project and I would be
> better off just buying a nice welder. It was fun, but very time
> consuming.
>
> I also post the source code of my welder, written in BASIC, here:
>
> http://igor.chudov.com/projects/Welding/11-New-Rectifier/source.txt
>
> It is under GPL, so feel free to do whatever you want with it, as long
> as you keep it free software.
Sure, thanks Iggy. I forgot yours was a three phase sysem, which does shift
things around a bit. I'll look through the page you provided, that looks
like a good place to start.
Thanks,
Jon
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Posted by Ignoramus18948 on April 28, 2008, 5:41 pm
Please log in for more thread options > "Ignoramus18948" wrote:
>> , Jon Danniken wrote:
>>> Hey Iggy,
>>>
>>> I am in the process of converting my buzzbox to something resembling a
>>> 150A
>>> TIG supply. I already have the AC-DC section figured out, as well as the
>>> HF
>>> area.
>>
>> What is your OCV?
>
> 80V on the low range, for AC. I'll probably lose a bit after it goes
> through the bridge.
>
>>> I believe you used SCRs in a circuit you used to control the output
>>> current of one of your machines, and I am very interested in this.
>>> Do you by any chance have a schematic of this section of your
>>> circuit, and/or any other reference schematics of going about this
>>> topology for a high current supply?
>>>
>>
>> Jon, I have some documentation along with parts pictures, sample
>> welds, etc, here:
>>
>> http://igor.chudov.com/projects/Welding/11-New-Rectifier/
>>
>> If your welder is single phase (mine is 3 phase), it changes a lot due
>> to ripple.
>>
>> All together, this was a moderately expensive project and I would be
>> better off just buying a nice welder. It was fun, but very time
>> consuming.
>>
>> I also post the source code of my welder, written in BASIC, here:
>>
>> http://igor.chudov.com/projects/Welding/11-New-Rectifier/source.txt
>>
>> It is under GPL, so feel free to do whatever you want with it, as long
>> as you keep it free software.
>
> Sure, thanks Iggy. I forgot yours was a three phase sysem, which does shift
> things around a bit. I'll look through the page you provided, that looks
> like a good place to start.
>
Another point is, SCR driver boards are expensive. I was very lucky in
that for some readon, PCTI liked my kids site algebra.com so much that
they donated a SCR driver device to me, which was easy to use.
Still, I would be far better off applying my efforts elsewhere,
wotking less hours, and buying a great new welder. That said, I
learned something.
--
Due to extreme spam originating from Google Groups, and their inattention
to spammers, I and many others block all articles originating
from Google Groups. If you want your postings to be seen by
more readers you will need to find a different means of
posting on Usenet.
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Posted by Jon Danniken on April 28, 2008, 9:39 pm
Please log in for more thread options "Ignoramus18948" wrote:
> Another point is, SCR driver boards are expensive. I was very lucky in
> that for some readon, PCTI liked my kids site algebra.com so much that
> they donated a SCR driver device to me, which was easy to use.
>
> Still, I would be far better off applying my efforts elsewhere,
> wotking less hours, and buying a great new welder. That said, I
> learned something.
Those are some good points you make there. I guess what I am trying to do
is use a handfull of discrete componenets to make as simple of a
variable-current supply as I can get away with. Perhaps the only way to
control the current is with a highly-advanced topology, utilizing complex
circuit boards, but if there is a way to do it with a minimum of components,
then I am going to try to do this.
I guess what I really need is to look at a schematic of a transformer-based
TIG supply that used SCRs to control the output current, and see how they
did it there, but I don't know the name of any units that used such a
control method, much less have a schematic.
Jon
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>
> I am in the process of converting my buzzbox to something resembling a 150A
> TIG supply. I already have the AC-DC section figured out, as well as the HF
> area.