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Old 8th December 2011, 08:32 PM   #11
dangus is offline dangus  Canada
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Motorola used to make a regulator chip that was ideal for lab power supplies, the MC1466. I'm pretty sure the app notes include an adjustable high voltage supply. There's a link to a recreation of it using discrete components in my post here Adjustable +/- 0-50V 0-5A Power Supply Schematics.
The LM10CH app notes include a lab power supply regulator, and last time I checked that chip was still available.
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Old 10th December 2011, 06:07 AM   #12
RJM1 is offline RJM1  United States
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Since you only need about 100ma you might be able to do something like this.
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Old 10th December 2011, 12:56 PM   #13
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Originally Posted by RJM1 View Post
Since you only need about 100ma you might be able to do something like this.
Looking at your proposal, is it not easier using a 1:1 main transformer (primary side connected to the mains),
then the rectifier and the capacitor and shunting this with for instance a 470k pot meter to obtain an adjustable voltage? The top side of the pot meter
is connected to the rectified voltage (about 250V).
And then there remains of course the problem how to draw a supply current of say 60mA.
Obviously this cannot be drawn via the slider of the pot meter, but perhaps some
(high voltage) NPN emitter follower will do the trick.

Last edited by JoeAlders; 10th December 2011 at 01:06 PM. Reason: spelling
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Old 10th December 2011, 03:23 PM   #14
RJM1 is offline RJM1  United States
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True, but with what I suggested you would not have to have a pass transistor dissipating 20W
when you are delivering 50V at 100 ma (250-50V*.1A). Not to mention safer as all your power control circuitry would be low voltage. The parts count would definitely be higher though.
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Old 11th December 2011, 07:21 PM   #15
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what about using tubes after all jogris has some nice schematics available .
Verschiedene Roehren-Netzteile und ihre Schaltungen

for the amperage your needing a transformer from an old tube radio is enough


http://www.jogis-roehrenbude.de/Roeh...-Netzteile.pdf

tubes are cheap PL84 is identical to el86 and will supply about 60 milliampere take another tube and some zener diodes and incorperate an error amplifier

the materials are easy to acquire if your having trouble i might be of assistance

one thing to note is that a solid state solution is gone in a snap while a tube will put up a considerable fight .
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Old 12th December 2011, 09:14 AM   #16
Elvee is online now Elvee  Belgium
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Quote:
Originally Posted by JoeAlders View Post
Hello,
This is the first time I am posting on this Forum, so have a little bit kindness please.
I am trying to build a regulated voltage supply with the range of 50–200 Volts and a maximum capability of a 100mA load. But without having to use tubes.
Yes, I can browse this whole part of the Forum to see if there is already published something, but anyway…..
Can somebody help me please?
Joe.
This regulator can be adapted by making R2 variable between ~100K and 500K.
Performances are pretty mean, but since you need no regulation, that should be sufficient.
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Old 13th December 2011, 08:29 AM   #17
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Originally Posted by Elvee View Post
This regulator can be adapted by making R2 variable between ~100K and 500K.
Performances are pretty mean, but since you need no regulation, that should be sufficient.
Thank you very much Elvee for this circuit diagram.
At first glance I suppose the Mosfet M1 is the current limiting part of the circuit?
If the current though R5 exceeds a certain value then collector current of Q2
flows through R1 which starts to decrease the Vgs voltage of M1 increasing the
‘on’ resistance of the Mosfet. Hope this is correct?
I will analyse this circuit using LTspice (which you did also I see) to get more insight.
Joe.
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Old 13th December 2011, 08:42 AM   #18
Elvee is online now Elvee  Belgium
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M1 is the ballast element, it does the voltage regulation, and optionally the current limiting, under the control of Q2.
If current limiting is not required, you can drop Q2-R5-R6.
You can also create a foldback mechanism, to reduce the dissipation when limiting, by tying a resistor between Q2's base and M1's drain.

See the thread "Simple HV series regulator" for an example.

I do not have a copy of the .asc file on this computer, tonight I'll be able to post it (it is not complicated anyway).
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Old 13th December 2011, 04:23 PM   #19
Elvee is online now Elvee  Belgium
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Here is the asc file:
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Old 13th December 2011, 07:25 PM   #20
magnu is offline magnu  Sweden
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Here is a quite old "description"
http://cp.literature.agilent.com/lit...6299-90001.pdf
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