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From: "Jan Wagner"
Subject: Re: gapped core design
Date: Thu, 2 Jan 2003 12:03:24 +0200
Organization: Helsinki Television
NNTP-Posting-Date: 2 Jan 2003 10:23:01 GMT
X-Newsreader: Microsoft Outlook Express 6.00.2720.3000
"Winfield Hill" wrote in message
> "Jan wrote...
> > [ snip ]
> > I need a magnetizing inductance of 10uH and leakage inductance of 8uH.
> > Trial-and-error designing probably goes this way: remove the ferrite E
> > core halves, wind the primary on the bobbin until it reaches 8uH, then
> > insert the E core halves slowly until you measure a total inductance
> > of (8+10)uH. Is that the correct approach??
> The transformer leakage inductance generally results from the relative
> configuration of the two windings, rather than the size of the core gap.
Doesn't that only adjust coupling? I think leakage inductance is the self
inductance of the winding with no core, i.e. when you place a shorted turn
through the core it shunts the magnetizing inductance and leaves only the
self/leakage-inductance? big mistake?
> Gapping is generally a separate issue, to reduce core loss.
> But a leakage inductance that's 80% (or do you mean closer to 50%?)
> of the total inductance is very high
Yeah, about 50% of total. It could be less, but then frequency excursion
from no-load to full-load gets worse. Right now it is 80kHz to 120kHz...
> and probably will have to be created
> by a subterfuge, such as using a split bobbin and winding the primary
> inside one core and the secondary inside the other. Then you can play
> games with the gap.
Ah! Hadn't tought of that one. :-) I'll try this. Thanks!
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