Hi,
maybe small avr with PWM regulation could help?
Regards
Dnia 2011-07-22 05:26 Jens Boos napisał(a):
Hi, well, I would not like to use separate transformers, I would like
to
keep it as flexible as possible. Joe: Well, I see that it is quite difficult,
but why would a linear regulator not work fine? I could use a linear
regulator with a neat heatshrink... Another thought: There are some modules
by Traco (http:// www.tracopower.com/products/mhv.pdf) who do exactly what I
want, e.g. the MHV12-300S10P, but I would like it to have two or three times
the maximum power. It cannot be too complicated if it is available in this
format, now could it? Thanks Jens On 22 Jul., 13:35, Joe Croft
<[email protected]> wrote:
I always envisioned such a to be 100V to 500V and a bit
beefier in the
current,somewhere between 50 and 100MA. Both linear regulators and voltage
dividers are out of the question. If you think about it, a linear regulator
and a load is a voltage divider, so in either case the power dissipation
will be the same. Sadly, what you are asking for is no small cup of tea. It
can be done though it will take perseverance. Certainly more than I have.
-joe On Friday 22 July 2011 05:44:12 jb-electronics wrote:
Hi folks,
here's that topic again, a Nixie tube power supply.
The background is this: I would like to build a
universal power supply
that can be used to drive all kinds of display devices: VFD tubes with their
50-60V anode voltage, as well as larger Nixie tubes with 300V anode voltage
and 25mA current.
But it is not so easy:
The powre supply should be regulated from 0..300V @
30mA max: I adjust a
voltage, say 250V, and the supply will give me as much current as possible,
but 30mA max. The current that actually flows through the tube will be
adjusted with an external set of resistors.
Can you guys point me to the right direction? I do not
quite have a clue
of SMPS designs, all I know is that I do not want to electrocute myself ;-)
There is the alternative of a variable transformer and
just rectifying
that, but I do not like the idea of getting the current directly from mains
without any limiting effects.
Another alternative might be to use the "two
transformers back to back"
idea and generate 300V DC, and then use a linear voltage regulator to adjust
the voltage. The problem will be, though, that the regulator will not work
in the lower voltage areas, it would have to dissipate 9W! This can of
course be sidestepped by introducing an optional voltage divider, but this
gets messy. Anyone know a suitable linear regulator?
Any other ideas are quite welcome, too.
Best regards, Jens
PS: I think I have sent this email twice, but at first
with a wrong email
address. Please ignore the first email ;-)
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