help in HV power supply!!!
FaLLoUT, Tue Aug 01 2006, 11:45AMGuys i want to power a 20kv 15mA CO2 burning laser.. what is the simplest way without spending
thousands of dollars... can a TV flyback or microwave oven take the strain??
Re: help in HV power supply!!!
Steve Conner, Tue Aug 01 2006, 11:50AM
Assuming you can't get hold of a big high voltage transformer and ballast choke, I reckon Steve Ward's high frequency AC power supply (what he calls the CCPS) would be the easiest option. It needs some power electronics, but the ferrite cored transformer is easier to make than a 60Hz iron-cored one would be.
Steve Conner, Tue Aug 01 2006, 11:50AM
Assuming you can't get hold of a big high voltage transformer and ballast choke, I reckon Steve Ward's high frequency AC power supply (what he calls the CCPS) would be the easiest option. It needs some power electronics, but the ferrite cored transformer is easier to make than a 60Hz iron-cored one would be.
Re: help in HV power supply!!!
Wilson, Tue Aug 01 2006, 01:32PM
You should *just* be able to get that much out of a flyback....for a while at least. You'll just need to figure out a way to regulate it somewhat ;) and add an external filtering cap. Don't except the flyback to like it though ;)
Wilson, Tue Aug 01 2006, 01:32PM
You should *just* be able to get that much out of a flyback....for a while at least. You'll just need to figure out a way to regulate it somewhat ;) and add an external filtering cap. Don't except the flyback to like it though ;)
Re: help in HV power supply!!!
..., Tue Aug 01 2006, 03:19PM
If you bought a 7.5kv/30ma nst and made a voltage doubler on it (the same circuit as in a microwave oven) you would get almost exactly 20kv/15ma...
..., Tue Aug 01 2006, 03:19PM
If you bought a 7.5kv/30ma nst and made a voltage doubler on it (the same circuit as in a microwave oven) you would get almost exactly 20kv/15ma...
Re: help in HV power supply!!!
FaLLoUT, Tue Aug 01 2006, 03:37PM
thanx a lot guys im not sure about the flyback because it will be a bit risky... i searched the whole forum but i cant find a topic about Steve Ward's high frequency AC power supply shall i just google it?
FaLLoUT, Tue Aug 01 2006, 03:37PM
thanx a lot guys im not sure about the flyback because it will be a bit risky... i searched the whole forum but i cant find a topic about Steve Ward's high frequency AC power supply shall i just google it?
Re: help in HV power supply!!!
EEYORE, Tue Aug 01 2006, 04:28PM
I would most deffinately go for a NST(doubled) + variac...
Matt
EEYORE, Tue Aug 01 2006, 04:28PM
I would most deffinately go for a NST(doubled) + variac...
Matt
Re: help in HV power supply!!!
Steve Ward, Tue Aug 01 2006, 05:47PM
Have a look at my website:
Unfortunately, i still havent posted a final schematic for the controller/driver. I think i will just post something simple that can get people started. Its really more of a project for ambitious people who dont mind learning a bit about power electronics, and working with small circuit boards. This is certainly not the "simplest way", but you'd learn a heck of a lot.
Or, you could search around for a 15kVAC 30mA NST (check around at local sign shops, ask to buy/have a used transformer). The peak voltage output is 21kV, but with diode drops and filtering, it would probably end up right at around 20kVDC, and should be ok for about 15mA id think. But, the 20kV would not be ground referenced because the NST is center-tapped ground.
Microwave oven transformers only put out about 2kV, so they are pretty useless here.
Flybacks are usually only capable of maybe 100W continuously for any long period of time, but could easily do 20kV. You could gang up a bunch of them in parallel perhaps. Voltage regulation might be hard...
EDIT: Apparently i did add a schematic of the driver on my website.
Steve Ward, Tue Aug 01 2006, 05:47PM
Have a look at my website:
Unfortunately, i still havent posted a final schematic for the controller/driver. I think i will just post something simple that can get people started. Its really more of a project for ambitious people who dont mind learning a bit about power electronics, and working with small circuit boards. This is certainly not the "simplest way", but you'd learn a heck of a lot.
Or, you could search around for a 15kVAC 30mA NST (check around at local sign shops, ask to buy/have a used transformer). The peak voltage output is 21kV, but with diode drops and filtering, it would probably end up right at around 20kVDC, and should be ok for about 15mA id think. But, the 20kV would not be ground referenced because the NST is center-tapped ground.
Microwave oven transformers only put out about 2kV, so they are pretty useless here.
Flybacks are usually only capable of maybe 100W continuously for any long period of time, but could easily do 20kV. You could gang up a bunch of them in parallel perhaps. Voltage regulation might be hard...
EDIT: Apparently i did add a schematic of the driver on my website.
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