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From: "Steve Denning"
Subject: Re: multiple flybacks in parallel
X-Newsreader: Microsoft Outlook Express 6.00.2800.1106
Date: Thu, 14 Nov 2002 01:09:00 GMT
NNTP-Posting-Date: Wed, 13 Nov 2002 20:09:00 EST
The standard inductance tolerance from the manufacturer is 20%, but I could
tighten the spec if need be.
"Roy McCammon" wrote in message
> Steve Denning wrote:
> > I am working on an application where I need 6 low power outputs(approx
> > each) but each output must be isolated from each other. I'm required to
> > 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
> > flyback transformer primaries in parallel. I would get feedback from
> > supply to try to control the others. The load on all supplies is the
> > My gut tells me not to try this, but in theory I guess it could work.
> > anyone tried this? What would the risks be?
> The flyback stores energy in the primary during one part
> of the cycle and transfers it to the secondary during the
> other part of the cycle. You vary the total power
> by varying the energy stored in each cycle, or varying
> the number of cycles per second. Each of your transformers
> will see the same cycle time and frequency, so the energy
> transferred will be inversely proportional to the primary
> inductance. How well do the inductances match?
> Thank you for reading and or replying
> If you are one in a million, there are 6000 people just like
> Local optimization almost never yields global optimization.
> Opinions expressed herein are my own and may not represent those of my
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