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Power supply load capacity
Power supply load capacity
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Old 19th September 2004, 02:07 AM   #1
Dr.Frankenstein is offline Dr.Frankenstein  United States
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Default Power supply load capacity

In designing a power supply for my current prodject, I am questioning a couple of things someone may be able to answer for me?
Although I have ample heater taps on my pwr trans, I was wandering if I use another filament transformer that I have instead of using all of the heater taps on my supply trans if it would help take some of the load off of my main transformer?
I know that it would reduce the heat factor somewhat, but what Im getting at is I plan on pushing the b+ winding a bit into the upper limits. By taking some of the load off of the main tranny heater windings couldnt I push the b+ a little more? How does the load on one winding affect the other? Thanks to all who take time to post replies in advance!
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Old 19th September 2004, 10:17 AM   #2
SHiFTY is offline SHiFTY  New Zealand
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You certainly could do this, as a transformers main rating is VA ( volt*amps) By having filaments powered by another tranny you will reduce the load somewhat.

The best way to tell is heat- if your transformer is too hot to touch after an hour then you are drawing too much from it. Also regulation is another thing- if you are approaching the limits of the core, the voltage will be all over the place...
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Old 19th September 2004, 11:24 AM   #3
mcs is offline mcs  Denmark
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Default Re: Power supply load capacity

Originally posted by Dr.Frankenstein
By taking some of the load off of the main tranny heater windings couldnt I push the b+ a little more?
That depends on how the transformer is made. If the wire used for the B+ winding is just thick enough for the rated current, you can't get more current from it (it will just get too hot and break).

If the wire is thicker than needed, then you can get more current from one winding, if you don't load the other windings.

Best regards,

Mikkel C. Simonsen
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