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Registered Member #2431
Joined: Tue Oct 13 2009, 09:47PM
Location: Chico, CA. USA
Posts: 5639
Steve McConner wrote ...
Yes, the important point is that all SMPS transformers are in fact thermal limited, to about one-third of the saturation flux density, or less as the frequency increases. The saturation limited case is of practically no commercial use, so there's no point in studying it too deeply.
Bigger SMPS always run at lower frequencies, because the transformer is just one part of a system, and a good design optimizes the whole system. So, they take into account the labour expense of assembling hundreds of little 100kHz MOSFET modules, as opposed to a few slow pizza box-sized IGBTs. The traction electronics in electric locomotives run at a few kHz and process about 1MW.
Im actively pumping oil at high volume, shouldnt that increase my thermal limit way above that of an air cooled transformer? I plan to measure the hot spot on the prototype this summer. I plan too use about 600A/cm^2 on the conductors, too.
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Power of transformers, frequency + constant ferrite volume