Design aspects of a series of high frequency switch mode transformers

The proposed power supply is a discrete switch mode fly-back topology. It combines part of the resonance topology into the fly-back converter. The resonant action is generated by the snubber circuit and an expensive tank circuit is not required. The minimum switch-on circuit from the transformer primary lower auxiliary winding is designed in such a way that it provides a delay of half-resonant cycle before the driver circuit switches on the biasing circuit.