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Author Topic: Flyback Topology in S.M.P.S. Design  (Read 4471 times)
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tAhm1D
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« on: July 18, 2009, 07:00:06 19:00 »

Hi,
While designing S.M.P.S. circuits, I find that Flyback Topology is the most complex one. Though cheaper in comparison with other Topologies, its construction is difficult in respect to others. This is my observation and may not be agreed by others. I have decided to open this new topic so that through healthy discussion, we can clarify our doubts if necessary. What do you think?
« Last Edit: July 18, 2009, 07:03:53 19:03 by tAhm1D » Logged
abcsantosh
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« Reply #1 on: July 21, 2009, 02:38:57 14:38 »

    Yes, Flyback topology is low cost. It's uses in low power offline devices is pretty good. Whenever somebody wants low cost yet powerful smps with good regulation capabilities, mostly prefers Flyback.      
    Although it's construction is bit complex. Especially magnetics inside it. But once designer started to tam the beast, it is no more remains complex. Then this is the most easy yet low cost topology to build.    
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tAhm1D
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« Reply #2 on: July 27, 2009, 01:25:57 13:25 »

Hi,
Yes it is cheap in regard to other topologies and hence power supply companies prefer this for upto 500 watt range of Power supply. But its main difficulties are the proper air gap in the core and input- output inductance matching. And its transient suppression method should be flawless and for that, use of transorb diodes side by side of snubber is a useful application I find. Selection of Proper core with proper magnetic properties also play a vital role for its proper functioning.
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tAhm1D
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« Reply #3 on: September 16, 2009, 08:40:12 08:40 »

Hi,
Are you interested to convert a  5 volt to +24V  output through flyback DC to DC Converter? If yes,please visit the following link for an interesting circuit with details:
http://www.cappels.org/dproj/24vdcdc/24volt_ps.html
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janakfun
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« Reply #4 on: November 06, 2009, 05:03:14 05:03 »

well flyback topology is not that complex too... If you first look at block diagram then go in detail of each block.. Its very much similar to other topologies except few changes.. and once done with that it is ready...
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Janak
tAhm1D
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« Reply #5 on: November 06, 2009, 08:07:01 08:07 »

Yes, to the matured smps user, no topologies are complex. But in comparison with other smps topologies, the flyback is somehow different. Primary and Secondary Turn ratio and other criteria are not same here like other topologies. Here, you have to cater for Air gap for Back kick, primary and Secondary Inductance matching, Proper transient suppression, high peak current etc.  for proper functioning of the circuit for optimum duration. Only following the diagram will not suffice, because with the type of material used,the criteria also has to be matched. Not difficult but different with other topologies, which has to be known.
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