Flyback Converter: Working & Construction

[smruti]

we know that when we give dc supply to a transformer then transformer action doesn't takes place and the primary winding of a transformer gets burnt even when small dc is injected..but how the transformer used in flyback converter works in dc?? what about its construction?

 

[PMASwork]

A flyback converter (like any DC to DC switching converter) will take a DC input and first "chop" it into a square wave, making it an alternating waveform that can then be passed to the secondary of the transformer.

 

[berkeman]

we know that when we give dc supply to a transformer then transformer action doesn't takes place and the primary winding of a transformer gets burnt even when small dc is injected..but how the transformer used in flyback converter works in dc?? what about its construction?

http://en.wikipedia.org/wiki/Switched-mode_power_supply

 

[smruti]

A flyback converter (like any DC to DC switching converter) will take a DC input and first "chop" it into a square wave, making it an alternating waveform that can then be passed to the secondary of the transformer.

but the primary winding is supplied with dc...how it will work on dc??

 

[berkeman]

but the primary winding is supplied with dc...how it will work on dc??

You didn't read the wikipedia link, did you...

Have a look at the switching waveforms for a simple DC-DC converter. The waveforms are similar for a flyback converter with a transformer...

The DC input is chopped by turning on and off a transistor, which in turn presents an AC waveform to the inductor or transformer.

http://www.maximintegrated.com/en/images/appnotes/4266/4266Fig02.gif

 

[smruti]

thank you..:)

but the primary winding is supplied with dc...how it will work on dc??

 

[Windadct]

Here is a good reference for SMPS - TI Topologies