Return to KLUBNL.PL main page

[Top] [All Lists]

RE: LF: Stacking toroids

To: <[email protected]>
Subject: RE: LF: Stacking toroids
From: "Clemens Paul" <[email protected]>
Date: Fri, 24 Mar 2017 21:32:54 +0100
In-reply-to: <[email protected]>
References: <[email protected]> <[email protected]>
Reply-to: [email protected]
Sender: [email protected]
Thread-index: AdKk16pYUoy9pig1TkSlQdibmQELdAABXBUw
Another way - a bit more complicated - to reduce heating significantly is to 
feed DC not via the center tap of the output XFM but via separate DC chokes.
This would eliminate the DC bias of the core(s).


>-----Original Message-----
>From: [email protected] 
>[mailto:[email protected]] On Behalf Of Markus Vester
>Sent: Friday, March 24, 2017 8:48 PM
>To: [email protected]
>Subject: Re: LF: Stacking toroids
>Yes Chris, this will work. Doubling the core cross section 
>will halve the flux density, and reduce the per-core 
>dissipation by at least a factor of four. The improvement may 
>be more if the flux was so high that losses were dominated by 
>hysteresis (up to a factor of 8).
>73, Markus (DF6NM) 
>-----Ursprüngliche Mitteilung----- 
>Von: Chris Wilson <[email protected]>
>An: rsgb_lf_group <[email protected]>
>Verschickt: Fr, 24. Mrz 2017 20:15
>Betreff: LF: Stacking toroids
>Hello LF people,
>If I have a ferrite toroidal output transformer for a push
>pull Class D 136kHz amp, that gets warmish after a WSPR15
>session, what would happen if I wound the same number of
>primary and secondary turns on two cores stacked together,
>all else remaining the same? Would it run cooler, but
>retain its transformation ratio, or would other things
>occur to make it not that simple? Thanks.
>Best regards,
>Chris 2E0ILY mailto:[email protected] <mailto:[email protected]?> 

<Prev in Thread] Current Thread [Next in Thread>