[Lowfer] Big Switching HV Power supply - Part II

[Joseph DiVerdi]

Ralph,

><snip>
>The TV flyback cores started off as two "C" shaped cores, placed
>pole-to-pole to form a square.  I then took another identical pair of
>"C" cores and glued them side by side against the first set, so that I
>had a double thickness of ferrite core.

OK, that pairing was just what I was thinking. I presume (magnetic circuitry is a weak spot for me) that the core cross sectional area is directly related to power handling capability (bad joints notwithstanding). What was the cross sectional area for the paired cores?

>That core handled 500 watts no sweat, and 1 KW intermittently, but 30
>minutes at a KW made it get pretty hot.  I could have raised the
>switching frequency from 40 KHz to 80 or 90 KHz, but the core losses
>were excessive at that frequency.  I think the core materiel was chosen
>for a lower frequency, which is reasonable, considering their previous
>use in TV output transformers.

Got it.

Have you or do you have any plans to publish an end-to-end schematic?

>73,
>Ralph   W5JGV - WC2XSR/13

73,
Joseph
-- 
Joseph A. DiVerdi, Ph.D., M.B.A.
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