Works fine for me:
The 2kVA transformer is under the bench. ;-)
(And thus begins a My Transformer is Bigger Than Yours contest .....GO!)
Tim
-- Deep Fryer: A very philosophical monk. Website @
One is made from iron and copper; the other is made from copper and iron. I forget which is which.
John
Here's our pick-and-place for one little transformer:
ftp://66.117.156.8/PP5.JPG
John
"Fred Bloggs"
** ROTFLMAO !!!WHAT ABSOLUTE CRAPOLOGY !!
** Funny how Iso transformers are used with rectifier/capacitor loadsALL THE TIME !!
That is why most are bought by techs, so they can work on the live parts of SMPS.
..... Phil
Normally the design is optimum when copper and core loss are the same. Since the copper and core loss are frequency dependent in a very nonlinear way, it would be obvious to all but the most dimwitted that the rectifier transformer going for a typically high crest factor load would be different...The rectifier transformer can handle the isolation transformer VA but not vice versa, the isolation transformer must be derated.
The value of your observations is nil...
t n
That brings up the question, what loads are isolation transformers optimized for? Wouldn't transformerless line-operated equipment be one of their biggest targets?
I think it would be an interesting experiment to run an isolation transformer at its rated VA into a resistive load, measure the temperature after some hours, then run the transformer into a rectifier/filter combination and load that DC voltage down to an equivalent VA rating, taking into account the published derating multiplier (0.87 for ful-wave bridge and capacitor input filter) and check the temperature in that use. I think I'll round up the parts and give that a try.
Mike
The transformer can take a lot of abuse. I think the DC available for the rectifier filter under load will be lower for the isolation than the rectifier transformer by a few percent.
"Mike Silva"
That brings up the question, what loads are isolation transformers optimized for? Wouldn't transformerless line-operated equipment be one of their biggest targets?
** Of course, the Bloggs imbecile is fabricating a total nonsense.Either ignore him or laugh at him.
Never take him one bit seriously !!
Isolation transformers are simply a sub-set of normal AC power ransformers - made exactly the same way by the same makers.
...... Phil
HAHAHAHAHAAAAAAAAA.....
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