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Old 20th January 2007, 07:56 AM   #1
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Default High Voltage Regulator Design

I am looking for a simple, yet effective, high voltage regulator design that can supply between 20 and 50mA at about 150 to 200V. Any suggestions, or any suggestions on where to look? Solid state is fine, and is probably preferred.

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Old 20th January 2007, 09:47 AM   #2
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look this http://www.tubecad.com/2006/11/blog0087.htm
or the evergreen LM317 with H.T. bjt ...
http://www.national.com/ms/LB/LB-47.pdf

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Old 20th January 2007, 01:54 PM   #3
nhuwar is offline nhuwar  United States
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One thing I was thinking of is youk now how you can hook a normal lm317 and have it switch transistor in series to run at higher voltages. Well I was also wouldering if it can switch igbt because I have igbt rateed at 1600vdc at 10 amps that would do for any regulator anyone would need here.

Nick
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Old 20th January 2007, 02:09 PM   #4
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Maida regulator which SY likes, the LastPAS regulator which I like, the LR8N3 regulator.

I had PCB's made up for this circuit -- only a couple -- but should have included a bypass on the adjust pin to ground -- it works very nicely when bypassed:

Click the image to open in full size.
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Old 20th January 2007, 03:45 PM   #5
hacknet is offline hacknet  Singapore
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cant seemt to find the lr8n3 from my usual farnell.

are these chips expensive?
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Old 20th January 2007, 04:39 PM   #6
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I have them on my webstore -- the TO-92 version:
email me privately
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Old 27th January 2007, 08:10 PM   #7
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fwiw -- here's a simulation of the phase-gain plot for the LastPAS regulator:

Click the image to open in full size.
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Old 28th January 2007, 03:25 AM   #8
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For that service, I would just use the lm317 as is, nothing else required. 50mA at 200V won't come close to overwhelming it for heatsinking. Sure, just one accidental short and the 317 is toast, but who cares, they are cheaper than all the do-hickeys on a Maida regulator. I have a simple 317 regulator in my 160V B+ 6922 preamp and it is still going strong for a year or two now.

EDIT: Forgot to mention, if your design assumption is 15% mains variation, which is way-overdesigning for the homes I have lived in, that's only 30V for a 200V B+, less than the 40Vdiff rating of an LM317 or the 60Vdiff rating of an LM317HV. It'll work fine unless you are trying to burn a lot of voltage.
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Old 28th January 2007, 01:31 PM   #9
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Quote:
Originally posted by leadbelly
For that service, I would just use the lm317 as is, nothing else required.
LM317 impedance charts in Audio Amateur crafted by Janneman may change your opinion.
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Old 28th January 2007, 06:55 PM   #10
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You may use simple source follower like one discussed recently,
or this one for better regulation and slow start:

Click the image to open in full size.
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