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The only tig machine i used was a fairly large lincoln, i think it was a 250 amp model or somewhere around there, anyway it would throw a 2 inch spark with the high voltage arc starter, unfortunately i dont have access to that machine anymore(highschool shop) i tried doing some testing on a...
Those were the specs I found, forgot to post an update, I watched some videos on YouTube of people powering them using dc arc welders with an added hv start circuit, I may give this option a try depending on how clean the dc of my welder is, gonna check it with my scope, still got some research...
Could anybody offer any pointers on designing the coupling transformer for the high voltage start? i have a dc welder which will produce at least 100 amps, might try to build a hv start circuit to be coupled into one of the welder output leads, my thoughts were a flyback or ignition coil driver...
Sorry did not realize at first you mentioned about using a transformer to coupled the hv, I will try to draw up a schematic of a power supply and high voltage starter
Someone brought this bulb in to the junk yard, a friend of mine works at, so he bought and gave it to me cause he knew i would find interest in it, after disassembling it i found a part number which lead me to the specs, 2400 watts and 73,000 lumens!! Now i will need to find a way to power it...
Here is an update: Just finished building the driver circuit, square waves are transfered perfectly between the SG3525 to the HCPL3120 ics, and i am waiting on the 15v power supplies, attached a picture of the boards, and a scope output, showing turn off of a, dead time and turn on of b...
Are there some simple methods of rfi blocking for the control circuitry? That is one aspect I haven't though alot about, wasn't sure how big of a problem it would be at 40khz? Another question I had is about the sg3525 circuitry, would there be a way to change that portion of the circuit around...
Adding on to the last post I made, did not see an edit button, anyways, was thinking more about my undersized specs for the igbt modules i will be using, I mentioned I will be using ee80 ferrites, I understand that I can parallel multiple sets of cores to make a higher powered power supply, how...
I looked into the ir2120 and other similar drivers to avoid using a separate supply for the high side, however I found on eBay some small 15v switchmode supplies for around $6 a piece, not sure on quality, but I will give them a try, if I get good results I will order two more so I can do...
I will look into those mentioned capacitors, and about the driver circuit, I chose the hcpl3120 because I saw a guy experimenting with them on YouTube driving similar igbt modules at very high powersand he had very good results, he also just used a 555 timer, I have looked into using something...
I will look into ordering some different snubber caps to try, also I know that it is important to keep the wires between the bulk cap bank and the igbt and the transformer as short as possible to minimize stray inductances, I will post some results, I currently have the sg3525 circuit completed...
Won't the caps also see voltage spikes from the switching of an inductive load such as a transformer? I have read some about adding snubber caps, I see they are usually designed to bolt right to the igbt module, how is the value of the snubber cap selected? If I understand correctly snubber caps...
Ok thank you that makes sense, what is the best type of capacitor to use? I have read a lot of mixed reviews on the subject, some say elecrolytics are fine and others have said that the high frequency isn't good with them, and film caps should be used, also heard that under 100khz electrolytics...
I understand that they are oversized, I scored a box of them for a very good price so decided I would make some use of them, once i learn more of the basics and get some working power supplies done I plan to build more powerful ones, and eventually I would like to try a full bridge and a 3 phase...
What should the capacitance be for C7 and C8? I have been doing lots of reading and that is one thing I can't seem to find any information on, and Frequency will be around 40 - 50khz, and I should have mentioned those aren't the igbts I will be using, I will be using a half bridge igbt brick...
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