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From: email@example.com (Gibbo)
Date: 13 Nov 2002 09:41:23 GMT
Organization: AOL, http://www.aol.co.uk
Subject: Re: multiple flybacks in parallel
"Steve Denning" firstname.lastname@example.org wrote:
>I am working on an application where I need 6 low power outputs(approx 2.5W
>each) but each output must be isolated from each other. I'm required to use
>existing magnetics to create the supplies. Rather than build 6 seperate
>supplies I am wondering if I could use one PWM chip and MOSFET and put the 6
>flyback transformer primaries in parallel. I would get feedback from one
>supply to try to control the others. The load on all supplies is the same.
>My gut tells me not to try this, but in theory I guess it could work. Has
>anyone tried this? What would the risks be?
I and many others have done it with transformer isolated forward converters. It
works just fine but the usual reason for this is to use an array of compact
transformers but still get high power. I don't see any reason why it can't work
with flybacks but I also don't see any advantage in doing it at such a low
power level. Why not just one primary and 6 secondaries on the same core ?
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