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Transformer experiment gone wrong?

 
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tfxuk7



Joined: 10 Dec 2009
Posts: 1
Location: chester

PostPosted: Sun Dec 13, 2009 7:41 pm    Post subject: Transformer experiment gone wrong? Reply with quote

I am currently experimenting with power tranformers. The parameters of the experiment are 1V AC into a 120V - 6V 12VA step down transformer. Measurements are taken at input and output, in voltage and amps and recorded against a rising frequency change. the secondary side has a 10kohm reistor for load. the frequencies are varied from 30Hz - 10kHz.
The input voltage 1V and the output voltge 40mV and output amps 4uA remained similar across the whole frequency range.

30Hz I in = 1mA
100Hz I in= 320uA
300Hz I in = 106uA
1kHz I in = 30uA
3kHz I in = 10uA
10kHz I in = 3.2uA!!!

the input amps are decreasing with increading frequency ....this results in an increasing efficiency why is this happening? I thought transformers decreased in efficiency with increasing frequency due to hysteresis losses. these results seem to suggest an increase in efficiency.

any ideas greatfully received?
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