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Science Forum Index » Electronics - Design Forum » HV regulated power supply help
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| spock |
 Posted: Fri Apr 25, 2008 3:30 am |
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Hello Everyone
I need to build a Variable regulated dc power supply. 0 - 600V dc @ 300mA
Would a IGBT device be suitable as a control element, the only circuits I have
seen use vacuum tubes but will not handle 300mA only 100mA and they use two
6L6 in parellel in class A. Any ideas please.
Lee |
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| Rene Tschaggelar |
| Posted: Fri Apr 25, 2008 7:55 am |
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spock wrote:
Quote: Hello Everyone
I need to build a Variable regulated dc power supply. 0 - 600V dc @ 300mA
Would a IGBT device be suitable as a control element, the only circuits I have
seen use vacuum tubes but will not handle 300mA only 100mA and they use two
6L6 in parellel in class A. Any ideas please.
How about a stepup transformer switcher ? You
didn't mention anything about the acceptable
ripple.
Rene
--
Ing.Buero R.Tschaggelar - http://www.ibrtses.com
& commercial newsgroups - http://www.talkto.net |
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| Phil Allison |
| Posted: Fri Apr 25, 2008 8:09 am |
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"spock" ..
Quote:
I need to build a Variable regulated dc power supply. 0 - 600V dc @ 300mA
Would a IGBT device be suitable as a control element, the only circuits I
have
seen use vacuum tubes but will not handle 300mA only 100mA and they use
two
6L6 in parellel in class A. Any ideas please.
** Use a Variac to control the AC voltage to the supply transformer.
Use a 500VA tranny for good regulation and an LC filter network for low
ripple.
A 240:240 isolation job with a two diode voltage doubler is all you need.
....... Phil |
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| spock |
| Posted: Fri Apr 25, 2008 9:30 pm |
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Guest
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Thanks
How about this IGBT HGTG10N120
1200V 35A 298W
I just don't know how to bias it yet, etc.
Lee
"StickThatInYourPipeAndSmokeIt" <Zarathustra@thusspoke.org> wrote in message
news:8ds414l0mmqs371be4cct6psha1e7o95dg@4ax.com...
Quote: On Fri, 25 Apr 2008 17:48:55 +0930, "spock"
vk5abcnospam@optusnet.com.au> wrote:
Hello Everyone
I need to build a Variable regulated dc power supply. 0 - 600V dc @ 300mA
Would a IGBT device be suitable as a control element, the only circuits I have
seen use vacuum tubes but will not handle 300mA only 100mA and they use two
6L6 in parellel in class A. Any ideas please.
Lee
There are cheap class D front ends out there that you could use to
drive a final stage. Precise control, low distortion.
Yes, IGBTs would be the pick. It might take more than one for reliable
operation, however. Remember... for 600V operation, you want a higher
voltage device. An 800V or 1000V or 1200V device. That is, unless you
multiply your output.
600V at 180W is hefty push for a single device. |
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| Jon Elson |
| Posted: Fri Apr 25, 2008 10:25 pm |
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spock wrote:
Quote: Thanks
How about this IGBT HGTG10N120
1200V 35A 298W
I just don't know how to bias it yet, etc.
You should know that IGBT's can't be used in the linear mode,
they do not share current across the die unless forced hard into
saturation. This is ideal for switching power supplies, but no
good for linear control. At very low current, it just might
work in the linear mode, however.
Jon |
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| spock |
| Posted: Fri Apr 25, 2008 11:21 pm |
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What do you call low current 200- 300 mA for a 43A device?
Lee
"Jon Elson" <elson@pico-systems.com> wrote in message
news:nsednfOwM8wIPY_VnZ2dnUVZ_rjinZ2d@giganews.com...
Quote: spock wrote:
Thanks
How about this IGBT HGTG10N120
1200V 35A 298W
I just don't know how to bias it yet, etc.
You should know that IGBT's can't be used in the linear mode, they do not share current
across the die unless forced hard into
saturation. This is ideal for switching power supplies, but no good for linear control.
At very low current, it just might work in the linear mode, however.
Jon |
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| Mike |
| Posted: Sat Apr 26, 2008 10:10 am |
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On Fri, 25 Apr 2008 17:48:55 +0930, "spock" <vk5abcnospam@optusnet.com.au> wrote:
Quote: Hello Everyone
I need to build a Variable regulated dc power supply. 0 - 600V dc @ 300mA
Would a IGBT device be suitable as a control element, the only circuits I have
seen use vacuum tubes but will not handle 300mA only 100mA and they use two
6L6 in parellel in class A. Any ideas please.
Lee
That's a LOT of heat to dissipate especially with an output short circuit, so you're probably looking at
multiple pass elements unless you can vary the input to the regulator as you vary the output voltage.
A switchmode preregulator?
The Art of Electronics has a section on high voltage regulators, so you might want to check there.
It talks about using a mosfet or possibly an NPN bjt (MJ12005) as the pass element.
Mike
"In view of such harmony in the cosmos which I,
with my limited human mind, am able to recognize,
there are yet people who say there is no God.
But what really makes me angry is that they quote
me for the support of such views."
Albert Einstein (theoretical Physicist) |
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| JosephKK |
| Posted: Tue Apr 29, 2008 11:59 pm |
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On Fri, 25 Apr 2008 14:55:30 +0200, Rene Tschaggelar <none@none.net>
wrote:
Quote: spock wrote:
Hello Everyone
I need to build a Variable regulated dc power supply. 0 - 600V dc @ 300mA
Would a IGBT device be suitable as a control element, the only circuits I have
seen use vacuum tubes but will not handle 300mA only 100mA and they use two
6L6 in parellel in class A. Any ideas please.
How about a stepup transformer switcher ? You
didn't mention anything about the acceptable
ripple.
Rene
Part of the problem as stated is 0 to 600 V. Very annoying. A
4CX600J could do the output easily. But it will likely waste a LOT of
power without proper design of the rest of the supply. |
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| JosephKK |
| Posted: Wed Apr 30, 2008 12:04 am |
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On Fri, 25 Apr 2008 22:25:05 -0500, Jon Elson <elson@pico-systems.com>
wrote:
Quote: spock wrote:
Thanks
How about this IGBT HGTG10N120
1200V 35A 298W
I just don't know how to bias it yet, etc.
You should know that IGBT's can't be used in the linear mode,
they do not share current across the die unless forced hard into
saturation. This is ideal for switching power supplies, but no
good for linear control. At very low current, it just might
work in the linear mode, however.
Jon
Correct, i knew there was a reason i was thinking several parallel
power MOSFETS as well as a big tube. |
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| JosephKK |
| Posted: Wed Apr 30, 2008 12:07 am |
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On Sat, 26 Apr 2008 13:39:07 +0930, "spock"
<vk5abcnospam@optusnet.com.au> wrote:
Quote: What do you call low current 200- 300 mA for a 43A device?
Lee
"Jon Elson" <elson@pico-systems.com> wrote in message
news:nsednfOwM8wIPY_VnZ2dnUVZ_rjinZ2d@giganews.com...
spock wrote:
Thanks
How about this IGBT HGTG10N120
1200V 35A 298W
I just don't know how to bias it yet, etc.
You should know that IGBT's can't be used in the linear mode, they do not share current
across the die unless forced hard into
saturation. This is ideal for switching power supplies, but no good for linear control.
At very low current, it just might work in the linear mode, however.
Jon
Part of the issue is that like SCRs they switch pretty well but do not
operate in linear modes very well (at least popular devices). |
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