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Flyback transformer design considerations for efficiency ...
Flyback transformer design considerations for efficiency and EMIB ernard KeoghSystem and Solutions EngineerHigh Voltage Power SystemsIsaac CohenPrincipal System ArchitectLow Power Controller and ConverterTexas InstrumentsTexas Instruments 2 September 2016 Power Supply design Seminar 2016/17 IntroductionMany AC/DC and DC/DC power supplies, from very low power levels to as much as 150 W or more, use the Flyback converter. Often maligned and not always fully understood, the transformer is the heart of the Flyback power supply and probably the most important component. When designed and implemented well, the transformer can deliver the required performance cost-effectively. When poorly designed, it can cause EMI issues, low efficiency and possible thermal overstress paper will discuss the causes of the major losses in the Flyback transformer . In particular, we will review core loss in light of recent research findings that highlight the significant impact of duty cycle and DC bias.
The flyback transformer is responsible for a large percentage of the total losses in a flyback power stage. There are four categories of losses: • Core losses. • Copper (winding) losses. • Transition losses. • External losses. Core losses occur in the transformer’s ferrite core and depend on the core’s flux density (amplitude,
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