Hi folks,
for my Nixie tube making I need a power supply with a little more juice
than the 300V @ 10mA Traco module I have been using until now. This is
what I came up with:
I have a nice 400W variac, so if I connect that to a transformer
back-to-back circuitry (serving as a voltage amplification as well as
galvanic seperation), this - after rectification and a smoothing cap, of
course - gives me an adjustable voltage of
U_out_max = SQRT(2) x 230V x (15 : 9) = 542V DC .
Using some kind of gear on the variac knob will allow a reasonably
accurate adjustment of the output voltage. For the back to back
transformers I would like to use 16VA versions, supplying me with
I_max = 16 VA / 542 V x SQRT(2) = 42 mA .
Any mistakes so far?
Anyway, I was wondering what happens if you short the output of this
setup for a short time (< 10 seconds). The transformers I would like to
use are NOT short-circuit-protected. But I suppose for such a short time
this is not critical, is it?
I will include a voltmeter and amperemeter, and if the amperemeter
measures a current above a specified value (let's say 40mA) it will shut
down the output voltage using a relais. This is not a perfect
over-current protection, but the easiest one I can think of at these
voltages. This whole setup is still in the planning, but it is the
simplest design I could imagine.
Is there any major flaw in my design that I did not think of?
Thanks for your input, it is much appreciated.
Jens
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