Re: How to INCREASE leakage inductance

• To: tesla-at-pupman-dot-com
• Subject: Re: How to INCREASE leakage inductance
• From: "Malcolm Watts" <MALCOLM-at-directorate.wnp.ac.nz> (by way of Terry Fritz <twftesla-at-uswest-dot-net>)
• Date: Sun, 09 May 1999 22:45:54 -0600
• Approved: twftesla-at-uswest-dot-net
• Delivered-To: fixup-tesla-at-pupman-dot-com-at-fixme

cc. to same query on tesla2.


Hi Marco,

> A difficult question for transformer experts.

Not at all. An airgap is the way to go. In fact a lot of leakage L 
exists already because of the windings being on different legs. 
Better check it out before gapping. Note that the primary and 
secondary inductances are also affected but the turns ratio is 
preserved.

Cheers,
Malcolm

> We are talking about a 10 x 10 x 2.5 cm ferrite core, made by two U-shapes
> together. Windings are placed on two different legs.
> 
> I have not yet got my transformer assembled but I suppose I will measure its
> leakage inductance as a value lower than 160 uH.
> 
> To be used in my power supply I must have its leakage inductance set to
160 uH
> (or I have to add an external inductor to reach that value). As I would
like to
> avoid additional inductors, the question is:
> 
> how can I encrease the leakage inductance without rewinding many times
primary
> and secondary in a random trial manner?
> 
> Borrowing the idea from NSTs, could I just add an extra magnetical loop
(a kind
> of center leg) to the transformer, and how to do that in practice?
> 
> What about adding some air-gap (on both legs): will that affect also the
leakage
> inductance?

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