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From: Winfield Hill
Subject: Re: gapped core design
Date: 1 Jan 2003 13:23:53 -0800
Organization: Rowland Institute
X-Newsreader: Direct Read News 4.20
> [ 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.
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 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.
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