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4hv.org :: Forums :: High Voltage
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Glassman HV Supply

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Steve Conner
Tue Nov 30 2010, 02:42PM
Steve Conner Registered Member #30 Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706
 		I imagine he prised the lid off a Glassman power supply and there it was. smile

Or maybe they were surplus. If you want to change the polarity of a Glassman, I guess you can order a new multiplier for it and swap it out. But then you have the old one kicking around.
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radhoo
Tue Nov 30 2010, 02:50PM
radhoo Registered Member #1938 Joined: Sun Jan 25 2009, 12:44PM
Location: Romania
Posts: 701
 		I'm not sure if this helps, I got them from someone.
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Ash Small
Tue Nov 30 2010, 04:53PM
Ash Small Registered Member #3414 Joined: Sun Nov 14 2010, 05:05PM
Location: UK
Posts: 4245
 		Get a bag of HV diodes and a bag of HV caps off ebay and make one.

Just reverse the polarity of the diodes if you want a negative supply.

There must be threads on multipiers here if you look for them.
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radhoo
Tue Nov 30 2010, 05:16PM
radhoo Registered Member #1938 Joined: Sun Jan 25 2009, 12:44PM
Location: Romania
Posts: 701
Ash Small wrote ...

Get a bag of HV diodes and a bag of HV caps off ebay and make one.

Just reverse the polarity of the diodes if you want a negative supply.

There must be threads on multipiers here if you look for them.
Actually I also had a bag of diodes and one of caps, so I also built a multiplier from scratch.
150x150

However that's nowhere near what the Glassman multiplier can put out, not to mention that I have a positive and a negative one (that's double the voltage potential), the HV divider that can be used to accurately measure the output, and the HV resistor in the white pipe that will protect the supply's caps and diodes.

Hope to finish the schematics soon, then I'll upload it and maybe you can give me some hints on a good driver.
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Finn Hammer
Tue Nov 30 2010, 06:42PM
Finn Hammer Registered Member #205 Joined: Sat Feb 18 2006, 11:59AM
Location: Skørping, Denmark
Posts: 741
Steve McConner wrote ...

I believe Glassman power supplies are air insulated, they don't have oil in them. Link2

Nice find :)

Well that was a usefull link.
Now we know for a fact, that a good driver for a C-W voltage multiplier is a SLR Converter : Link2

Cheers, Finn hammer
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Pinky's Brain
Tue Nov 30 2010, 07:42PM
Pinky's Brain Registered Member #2901 Joined: Thu Jun 03 2010, 01:25PM
Location:
Posts: 837
Finn Hammer wrote ...

Now we know for a fact, that a good driver for a C-W voltage multiplier is a SLR Converter : Link2
How do you come to the conclusion that they are using this? A regulated series resonant converter isn't fixed frequency is it?

Sounds like discontinuous flyback to me (zero current switching & fixed frequency).
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Steve Conner
Tue Nov 30 2010, 08:29PM
Steve Conner Registered Member #30 Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706
 		I've just been discussing this with a fellow member who wants to build a driver for a C-W multiplier in an X-ray head.

There are all sorts of drivers used in these HV power supplies: quasi-resonant, resonant, current-fed, SLR, whatever. I think Finn knows that the SLR works beautifully because he already tried it. smile It's very robust and powerful, but hard to regulate.

SLR and current-fed are inherently short-circuit proof, but you can make the others short-circuit proof by sticking a ballast inductor in series with the output.

The one topology that high-power converters NEVER use is discontinuous flyback: it's the least efficient one.
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Pinky's Brain
Tue Nov 30 2010, 10:26PM
Pinky's Brain Registered Member #2901 Joined: Thu Jun 03 2010, 01:25PM
Location:
Posts: 837
 		Never said it didn't work ... just that it's not fixed frequency if regulated.

I know flyback is not often used, I know it's not AC unless you use two or add a resonant circuit on the output. Ignoring that for a moment.

- fixed frequency PWM
- zero current turn on
- mostly inductive energy storage

What else can it be? Discontinuous flyback or boost are the only thing which come to my mind.

PS. they only claim 90% efficiency and it's not that high power.
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Adam Munich
Wed Dec 01 2010, 12:10AM
Adam Munich Registered Member #2893 Joined: Tue Jun 01 2010, 09:25PM
Location: Cali-forn. i. a.
Posts: 2242
Incomprehensibilis Humana wrote ...

like NST's at a $1 a pop?

tongue Touché
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Steve Conner
Wed Dec 01 2010, 11:06AM
Steve Conner Registered Member #30 Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706
 		The SLR can be regulated the same way as the current-fed inverter: by varying its DC bus voltage with a buck converter.

A quasi-resonant voltage-fed inverter also meets the Glassman criteria.
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