Plasma cutter power supply

Nixie · 20th October 2006, 11:16 AM

I'm looking for schematics for a suitable switching power supply, 115 VAC mains in, 90 VDC 15 A out. Didn't want to do linear due to the need for huge transformer and filter caps.

Tall Shadow · 20th October 2006, 12:40 PM

Hey Nixie,
Are you replacing a damaged Plasma supply, or are you DIY'ing a Plasma cutter from scratch?

Tall Shadow

Nixie · 20th October 2006, 12:46 PM

DIYing from scratch. I already built the torch head.

Tall Shadow · 20th October 2006, 03:24 PM

I'd love to get any info you could provide!
I've been searching for information about doing the same thing for some time now, and what little I did have was just lost on an un-backed up hard drive.(dumb!, dumb!, Dumb! Me!!)

Any plans, Sites, or other information would be helpful!
I've had so little luck in finding any information on the requirements needed by a Plasma cutter supply.

It might be that, the power supply could be made form a modified existing supply.....I don't know..

Thanks!, I'm really looking forward to seeing where this goes.

Tall Shadow

Nixie · 20th October 2006, 09:55 PM

Well I only have plans for the torch head. I bought them on eBay, and I don't think it would be fair to the seller if I gave them to others. At $7, it's not much to buy them.

A directly mains-rectified and filtered supply using a multi-gallon salt water resistor can be found at http://tech.groups.yahoo.com/group/p...omeBrewPlasma/
However, I'd prefer a more efficient switching supply.

Nixie · 23rd October 2006, 04:55 AM

Oh come on, surely someone here knows about switching power supplies. Where do I find a 15 kVA high frequency transformer?

What about multiples of smaller transformers, like say several of this one in series: http://www.surplussales.com/Transfor...hingXmers.html (TP) 20T0175-A01

powerbecker · 23rd October 2006, 05:30 AM

Nice link!
Why not buy there 2 for 69$ each?

• Input: 115 / 230v - 15 amps max. 50 / 60 / 400 Hz
• Output: 48.0v @ 15.6 amps, 5.1v @ 50 amps, 24.0v @ 10 amps / 2000 watts total
• Voltage adjustment: ± 10% minimum
• Line & load regulation: 0.2% + 5mV max
• Ripple: RMS 0.1% or 10mV
• Ripple: Pk-Pk 1% or 50mV
• Dynamic response: 25% load step, 2% or 100 mV (any output)
• Recovery time: To within 1% in 300µ sec
• Overvoltage protection: 2 to 5 V 122% to 134% of output voltage; 12 to 48 V 110% to 120%; recycle AC.
• Overload protection: 105% to 120% of rated current. Auxiliaries 105% - 140%
• Short circuit protection: Protected for continuous short circuit, recovery automatic
• Reverse voltage protection: 100% or rated output current
• Thermal protection: Each module thermally protected. Input module: Auto recovery. Output modules: Recycle AC
• Dimensions: 5" x 11-3/4" x 5"H

Nixie · 23rd October 2006, 06:55 AM

Can I put them in series to get the voltage I need? Plus, $138 for under 1.5 kW is steep, and where's the DIY in buying a complete unit.

powerbecker · 23rd October 2006, 02:33 PM

Nixie:
"Can I put them in series to get the voltage I need? "

Don´t know but normally the secondary is left floating.

"$138 for under 1.5 kW is steep"

That depends...I suppose to buy only the parts (plus the broken parts

)will cost about the same!

"and where's the DIY in buying a complete unit."

And why You look to surplus parts?
You don´t consider to mix and press ferrites and so on....

Ok that can be a point, but in my view that is not a challenge in contrast eg to create a useful plasma speaker!

Heinz!

Ultima Thule · 23rd October 2006, 05:45 PM

http://www.paytongroup.com/

20th October 2006, 11:16 AM	#1
Nixie Banned Join Date: Jan 2006 Location: Vancouver, BC	Plasma cutter power supply I'm looking for schematics for a suitable switching power supply, 115 VAC mains in, 90 VDC 15 A out. Didn't want to do linear due to the need for huge transformer and filter caps.

23rd October 2006, 05:45 PM	#10
Ultima Thule diyAudio Member Join Date: Jan 2004 Location: Koskenkorva Land	http://www.paytongroup.com/ __________________ "If transistors are blueberries and FETs are strawberries, then tubes must be.. pears" Michael 29th January 2010

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20th October 2006, 12:40 PM	#2
Tall Shadow diyAudio Member Join Date: Oct 2002 Location: Royal Oak, MI.	Hey Nixie, Are you replacing a damaged Plasma supply, or are you DIY'ing a Plasma cutter from scratch? Tall Shadow

20th October 2006, 12:46 PM	#3
Nixie Banned Join Date: Jan 2006 Location: Vancouver, BC	DIYing from scratch. I already built the torch head.

20th October 2006, 03:24 PM	#4
Tall Shadow diyAudio Member Join Date: Oct 2002 Location: Royal Oak, MI.	I'd love to get any info you could provide! I've been searching for information about doing the same thing for some time now, and what little I did have was just lost on an un-backed up hard drive.(dumb!, dumb!, Dumb! Me!!) Any plans, Sites, or other information would be helpful! I've had so little luck in finding any information on the requirements needed by a Plasma cutter supply. It might be that, the power supply could be made form a modified existing supply.....I don't know.. Thanks!, I'm really looking forward to seeing where this goes. Tall Shadow

20th October 2006, 09:55 PM	#5
Nixie Banned Join Date: Jan 2006 Location: Vancouver, BC	Well I only have plans for the torch head. I bought them on eBay, and I don't think it would be fair to the seller if I gave them to others. At $7, it's not much to buy them. A directly mains-rectified and filtered supply using a multi-gallon salt water resistor can be found at http://tech.groups.yahoo.com/group/p...omeBrewPlasma/ However, I'd prefer a more efficient switching supply.

23rd October 2006, 04:55 AM	#6
Nixie Banned Join Date: Jan 2006 Location: Vancouver, BC	Oh come on, surely someone here knows about switching power supplies. Where do I find a 15 kVA high frequency transformer? What about multiples of smaller transformers, like say several of this one in series: http://www.surplussales.com/Transfor...hingXmers.html (TP) 20T0175-A01

23rd October 2006, 05:30 AM	#7
powerbecker diyAudio Member Join Date: Dec 2004 Location: Berlin	Nice link! Why not buy there 2 for 69$ each? • Input: 115 / 230v - 15 amps max. 50 / 60 / 400 Hz • Output: 48.0v @ 15.6 amps, 5.1v @ 50 amps, 24.0v @ 10 amps / 2000 watts total • Voltage adjustment: ± 10% minimum • Line & load regulation: 0.2% + 5mV max • Ripple: RMS 0.1% or 10mV • Ripple: Pk-Pk 1% or 50mV • Dynamic response: 25% load step, 2% or 100 mV (any output) • Recovery time: To within 1% in 300µ sec • Overvoltage protection: 2 to 5 V 122% to 134% of output voltage; 12 to 48 V 110% to 120%; recycle AC. • Overload protection: 105% to 120% of rated current. Auxiliaries 105% - 140% • Short circuit protection: Protected for continuous short circuit, recovery automatic • Reverse voltage protection: 100% or rated output current • Thermal protection: Each module thermally protected. Input module: Auto recovery. Output modules: Recycle AC • Dimensions: 5" x 11-3/4" x 5"H

23rd October 2006, 06:55 AM	#8
Nixie Banned Join Date: Jan 2006 Location: Vancouver, BC	Can I put them in series to get the voltage I need? Plus, $138 for under 1.5 kW is steep, and where's the DIY in buying a complete unit.

23rd October 2006, 02:33 PM	#9
powerbecker diyAudio Member Join Date: Dec 2004 Location: Berlin	Nixie: "Can I put them in series to get the voltage I need? " Don´t know but normally the secondary is left floating. "$138 for under 1.5 kW is steep" That depends...I suppose to buy only the parts (plus the broken parts )will cost about the same! "and where's the DIY in buying a complete unit." And why You look to surplus parts? You don´t consider to mix and press ferrites and so on.... Ok that can be a point, but in my view that is not a challenge in contrast eg to create a useful plasma speaker! Heinz!

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