Ballast transformer secondary as a reactor for an unregulated power supply
ka1tdq:
I'm building an unregulated power supply using a transformer as a voltage doubler. The power transformer has a secondary of 45 volts at 17 amps. I'd like to limit the current inrush during power up and I happen to have a really big ballast transformer (see picture).
Could I use the secondary of the ballast transformer as an inductive filter for the power supply? Resistance starts out at around 2 ohms and settles down to 0.3 ohms.
Jon
DMOD:
If you are going to draw more than about 5 amps in your power supply it wont cut it.
Did you measure the inductance of the secondary?
Phil
ka1tdq:
It would at times draw more than 5 amps, so, yeah...
I didn't measure the inductance since I don't have a meter. I need to invest in one since they're pretty cheap.
I'll just use some sort of timed soft start circuit. I'm going to Vegas again for a couple days (I know, weird), so I'll think of something. I'm taking the laptop this time. No evil, scary books and calculators.
Jon
Opcom:
cheap inductance checker.
will it make a difference if the inductor saturates at >5A as long as the windings don't overheat? It'll already have done its job? I don't know your circuit.
ka1tdq:
Excuse the napkin, it’s the only paper at the moment.
True about the saturation. I only need inductive resistance for a few seconds. The coil windings are big enough to handle the current.
Jon
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