Chapter 15 Transformer Design

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Fundamentals of power ElectronicsChapter 15: Transformer design1Chapter 15 Transformer DesignSome more advanced Design issues, not considered in previouschapter: Inclusion of core loss Selection of operating fluxdensity to optimize total loss Multiple winding Design : as inthe coupled-inductor case,allocate the available windowarea among several windings A Transformer designprocedure How switching frequencyaffects Transformer sizen1 : n2: nkR1R2Rk+v1(t) +v2(t) +vk(t) i1(t)i2(t)ik(t)Fundamentals of power ElectronicsChapter 15: Transformer design2Chapter 15 Transformer Transformer Design : Basic A step-by-step Transformer Design AC inductor SummaryFundamentals of power ElectronicsChapter 15: Transformer Transformer Design :Basic ConstraintsCore lossTypical value of for ferrite materials: or B is the peak value of the ac component of B(t), , the peak ac fluxdensitySo increasing B causes core loss to increase rapidlyThis is the first constraintPfe=Kfe( B) AclmFundamentals of power ElectronicsChapter 15: Transformer design4Flux densityConstraint #2Flux density B(t) is related to theapplied winding voltage accordingto Faraday s Law.

Fundamentals of Power Electronics Chapter 15: Transformer design11 15.2 Step-by-step transformer design procedure The following quantities are specified, using the units noted: Wire effective resistivity ( -cm) Total rms winding current, ref to pri Itot (A) Desired …

  Power, Transformers, Winding