The detailed designing scheme of planar transformer used in converter is given considering switching frequency,volume,power loss and temperature rise of transformer based on the requirement of special and expected performance of dual switch forward converter with synchronous rectifier.Firstly,principle and special and expected performance as designing parameter for dual switch forward converter with synchronous rectifier are introduced.Secondly,design and parameter calculation of planar transformer in converter are provided,including setting of change about density of magnetic flux,selecting of core and decision of turn on windings.Subsequently,the work of checking on designing of transformer is finished,including degree of core saturation,ratio of exciting current,calculation on power loss and temperature rise of transformer.Lastly,temperature rise of transformer is estimated using Ansys/Icepak finite element analysis software for designing transformer by modeling.The experiment proves that electronic performance agrees with designing requirement,temperature rise of winding and core in the high frequency planar transformer is reasonable,and testifies that the design of planar transformer is achieved and reasonable by the testing performance of transformer sample.
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