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From: firstname.lastname@example.org (Roy McCammon)
Subject: Re: multiple flybacks in parallel
Date: Thu, 14 Nov 2002 09:26:53 -0600
X-Mailer: Mozilla 4.5 [en]C-CCK-MCD 3M/NCP 4.5 (WinNT; I)
Harry Dellamano wrote:
> "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
> the 6
> > > 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
> > transferred
> > 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?
> Hey Roy, that is only true in discontinuous mode of operation.
yes, I was think of discontinuous.
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