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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 .
dot-end of the primary winding is connected to ground, the dot-end of both the secondary and auxiliary windings will be negative and proportional to the input voltage. The respective rectifier diodes on those windings will thus be reverse-biased. While the primary switch remains on, current builds up in the primary winding at a rate dependent on
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