Whats stopping me from using a "coupled inductor" as a transformer

nsaspook

Joined Aug 27, 2009
8,688
The specific coupled inductor is designed as a energy storage device in a current pulse based circuit, I would expect it to be a less efficient for non-pulsed energy transfer than a device designed for AC sinewave transformer transfer action.
 

crutschow

Joined Mar 14, 2008
27,761
I know I am missing something small but significant
Yes, it's significant but not small.
It's the inductance of the inductor.
It must be high enough to keep the magnetizing current below the saturation current of the inductor.
Since that current is directly proportional to voltage and inversely proportional to frequency, the lower the frequency the larger the coupled inductor (transformer) to get the required inductance for a given voltage.
That's why 50-60Hz mains transformers are much larger for a given power, than a switch-mode supply which operates at 10's of kHz.
 
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