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From: email@example.com (Roy McCammon)
Subject: Re: multiple flybacks in parallel
Date: Wed, 13 Nov 2002 09:15:17 -0600
X-Mailer: Mozilla 4.5 [en]C-CCK-MCD 3M/NCP 4.5 (WinNT; I)
Steve Denning 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?
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
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