Re: 5V 100A secondary, 115V primary

John Woodgate wrote:
I read in sci.electronics.design that Boris Mohar <borism_-void-_@xxxxxxxxxxxx> wrote (in <j62n61pe5f44rqpb79kvq6nvrtc0rn72ej@xxxxxxx>) about '5V 100A secondary, 115V primary', on Sun, 24 Apr 2005:

Get a microwave transformer and cut out the secondary. Than wind your own secondary in place.


A microwave transformer will not supply 500 W for more than a few minutes even with fan cooling.

Wonder if you couldn't get there by winding a 5V secondary on a 5A variac core? Would be easy to pull a turn or two off the primary to get
exactly where you want to be.

NitPick Alert...
One could assume that you mean 115.000VRMS 60Hz sine wave input
gives 5.000VRMS output into a resistive 100ARMS load.
But that's an odd set of numbers.
Some applications would have a range of line input voltages
and a range of allowable output voltages. And when you get to 100A,
things like secondary resistance begin to matter. And if you intended
to rectify it and get 100A out, there are may be some peak current and core saturation issues...
I guess what I'm saying is that you haven't given enough information to
specify a transformer...but maybe it doesn't matter.
mike

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