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transformer core cross section variance

Started by Jamie M April 15, 2012
Hi,

I was working on a design for a fullbridge driven ferrite transformer
with a 300:1 turns ratio, and I'd like to do both primary and secondary
coils with a single layer (primary 170V/15A, secondary ~50kV/50mA).  If
I use 10 turns on the primary this would require 3000 turns on the
secondary, which is too much for a single layer, so I was wondering if
I used a molded ferrite core that had a reduced cross section where the
secondary coil is wound, would this boost the secondary voltage?  It
would be cool if I could use 1/10th the core cross section and get a
10x voltage boost, and thus only 300 turns required on the secondary.

I realize I could be totally out to lunch here! :)

cheers,
Jamie
On Sat, 14 Apr 2012 23:30:16 -0700, Jamie M wrote:

> Hi, > > I was working on a design for a fullbridge driven ferrite transformer > with a 300:1 turns ratio, and I'd like to do both primary and secondary > coils with a single layer (primary 170V/15A, secondary ~50kV/50mA). If > I use 10 turns on the primary this would require 3000 turns on the > secondary, which is too much for a single layer, so I was wondering if I > used a molded ferrite core that had a reduced cross section where the > secondary coil is wound, would this boost the secondary voltage? It > would be cool if I could use 1/10th the core cross section and get a 10x > voltage boost, and thus only 300 turns required on the secondary. > > I realize I could be totally out to lunch here! :)
Alas, you're totally out to lunch. All you'd do is make a transformer which utilizes it's core very poorly. -- Tim Wescott Control system and signal processing consulting www.wescottdesign.com
Jamie M wrote:
> Hi, > > I was working on a design for a fullbridge driven ferrite transformer > with a 300:1 turns ratio, and I'd like to do both primary and secondary > coils with a single layer (primary 170V/15A, secondary ~50kV/50mA). If > I use 10 turns on the primary this would require 3000 turns on the > secondary, which is too much for a single layer, so I was wondering if > I used a molded ferrite core that had a reduced cross section where the > secondary coil is wound, would this boost the secondary voltage? It > would be cool if I could use 1/10th the core cross section and get a > 10x voltage boost, and thus only 300 turns required on the secondary. > > I realize I could be totally out to lunch here! :) > > cheers, > Jamie
Turns per volt is related thus: K / sqrt(power rating of core) .