A while back I made a supply much like this.
I rectified and filtered the power line to get 140VDC. The built a small isolated 0 to 30V DC supply that sat on top of the 140V. In this case we never needed to go below 140 and never above 170. So the switching supply was very simple and small. (low voltage parts)
Reload(good name),
If some people are using RF to start the arc then remove C2 or make it small and let there be ripple. I was thinking of letting the boost up supply have 100khz spikes on it. (needs protection, but that is simple)
I was thinking the base power supply probably needs to voltage limit at 50V or something. And power limit at 1000 watts. (this is a small system)
50V @ 0 to 20A = 0 to 1000W,
25V @ 40A
12V@ 80A
I don't know if we need to power limit or current limit. Either way it needs to survive continuous shorts. I like the idea of power limiting. I see the idea of watching the arc voltage to know when to advance the tooling.
The boost up supply could easy be 100 watt. So 500V @ 2A or 250V@4A or 120V @ 2A. That should start the arc. I think 400 to 500 voltages limit and 100W power limit. As soon as the arc starts it will current limit the boost up supply and cause it to shut down. Then the arc will cause the main supply to current or power limit.
The other Ron
Reload(good name),
If some people are using RF to start the arc then remove C2 or make it small and let there be ripple. I was thinking of letting the boost up supply have 100khz spikes on it. (needs protection, but that is simple)
I was thinking the base power supply probably needs to voltage limit at 50V or something. And power limit at 1000 watts. (this is a small system)
50V @ 0 to 20A = 0 to 1000W,
25V @ 40A
12V@ 80A
I don't know if we need to power limit or current limit. Either way it needs to survive continuous shorts. I like the idea of power limiting. I see the idea of watching the arc voltage to know when to advance the tooling.
The boost up supply could easy be 100 watt. So 500V @ 2A or 250V@4A or 120V @ 2A. That should start the arc. I think 400 to 500 voltages limit and 100W power limit. As soon as the arc starts it will current limit the boost up supply and cause it to shut down. Then the arc will cause the main supply to current or power limit.
The other Ron
Now I understand what you are getting at with inductors. This is a good read on the subject and it is kept simple with nice little animations.
My friend the EDM machine, such fond memories.I was not a weld engineer, never even played one on TV. However, there was a time during my career when I reluctantly became involved with nuclear welding systems and EDM machines. Been retired two years and it was around 15 years before I retired so it was some time back. We had a large row of 5 or 6 CNC machines called Okuma Street (named after the machines). Every now and then a tool would break off in a part being machined. This is a ***** when the part is at the $25K plus point in the machining process. So how to remove a broken tap or drill? Place the part on an EDM machine and let the machine borough down into the broken tool. Slow but steady and bubble by bubble the snapped tool material was washed away until the broken tool would collapse on itself. I did redesign an old 60s vintage EDM machine which used Thyratron tubes to run on an updated solid state power supply. That was long ago but I was forever sucked into weld department issues after that. EDM and TIG Weldment are just a few things that fascinated me over the years.
Youngstown area huh? My future daughter-in-law is a Youngstown girl.
Ron
We use cookies and similar technologies for the following purposes:
Do you accept cookies and these technologies?
We use cookies and similar technologies for the following purposes:
Do you accept cookies and these technologies?