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In Reply to: RE: Given 140 watt dissapation...would a power transformer rated at posted by Caucasian Blackplate on July 01, 2015 at 19:02:49
Transformer 1 would be .5A x 800v=400va rating
Transformer 2 would be .3A x 800v=240va rating
Total current draw would be ~175ma.
I currently have a custom Heyboer power transformer which is the .3A@800v option....but that puppy gets really hot after 90 minutes.
Maybe upgrading to the Hammond 378cx @ 465 va would run cooler...but how much cooler?
Follow Ups:
Model your power supply in PSUD as best as you can, then look at RMS current on T1.I cooked up a power supply in about 15 seconds with 175mA DC current draw that demanded 685mA of AC current from the power transformer.
Edits: 07/02/15
Will do! Thanks!
I have lots of power transformers that run really hot. They can take it.
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Buy Chinese. Bury freedom.
You need t measure the current draw from each secondary. I think you are drawing more current than you think you are. It should not get really hot after 90 minutes if the load is what you think it is. The transformer could be defective as well.
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