Flyback “transformer” is NOT COUPLED INDUCTORS

The objective of this article is to correct two fundamental mistakes most POWER ELECTRONICS ENGINEERS make with following claims:

  1. Flyback transformer is no different than transformer since after all the same symbol is used as for 60Hz line transformer!
  2. Flyback transformer is really COUPLED INDUCTORS!

I am addressing the second claim here by claiming:

Flyback transformer is NOT COUPLED INDUCTORS. Here are the reasons.

First drawing shows flyback converter with its “transformer” with common ground between primary and secondary side. As shown in blue color, the ground connection can be separated to result in . . .

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