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Push-Pull converter with a gapped transformer ??
Push-Pull converter with a gapped transformer ??
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Old 25th December 2005, 03:38 PM   #31
Pjotr is offline Pjotr
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Join Date: Nov 2002
Location: Netherlands
Hi Joseph,

To put it simple: In a flyback transformer all the transferred energy is stored in the transformer in the magnetic field. It is not really a transformer, merely 2 coupled inductors because there is no current in the primary and secondary at the same time. Since the ferrite cannot store much magnetic energy there is a need for an air gap that stores most of the energy to be transferred.

In a forward/pp transformer the transformer only stores its own magnetisation energy. So if you want to use a fb transformer as a normal transformer you have a much to much (and unnecessary) amount of stored energy to deal with.

Btw. It is most time possible to disassemble surplus transformers by heating them at app 100-120 deg C. The potting compound then usually weakens sufficiently. The heat plate of my coffeemaker works perfectly well for that

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