Power losses calculations in windings of gapped magnetic components: The i2D method applied to flyback transformers

Abstract

Abstract-The improved 2-D equivalent analytical calculation method to estimate conductive losses in gapped magnetic components in a wide range of frequencies is extended to the calculations of conduction losses in flyback transformers. The i2D method, that is applicable to power inductor, is extended is extended to the winding loss calculation in gapped transformers, such as flyback transformers, by means of harmonic decomposition of the current though the windings that allows the proximity field calculation and, afterward, the estimation of the losses in the windings.The method is used to evaluate conduction losses in flyback transformers for switched mode power supplies (SMPS) and the results are compared with finite element analysis (FEA) and measurements.

Energetiškai efektyvaus fotovoltinio mikroinverterio kūrimas

“…Modeliuojant būtina žinoti tikslų apvijų tarpusavio magnetinį ryšį, kuris priklauso nuo sudėtingos magnetinės sistemos savybių ir apvijų išdėstymo. Tikslias šių parametrų vertes nustatyti yra sudėtinga (Holguin 2015 et al), todėl norint gauti patikimus tyrimų rezultatus tikslingai yra naudoti eksperimentinį tyrimą.…”

“…Dalis kintamo magnetinio lauko kuriamos magnetovaros (angl. magnetomotive force) atsiranda už transformatoriaus magnetinės šerdies ribų ir oro tarpuose veria apvijas (Ouyang et al 2015, Holguin et al 2015. Šios ne šerdyje esančios magnetinio srauto linijos kuria magnetinio srauto sklaidos reiškinį.…”

Impact of Transformer Design on Flyback Converter Voltage Spikes

“…Therefore, the flux, which does not link the primary and secondary Manuscript received 20 December, 2015; accepted 11 May, 2016 windings, is increased relative to the flux that links these windings. Because of this, the link between the primary and secondary windings is weakened [1], [4]. The part of flux that is located outside the core of transformer introduces the leakage inductance, which causes undesirable phenomenonthe voltage spikes on the drain of flyback converter MOSFET switch transistor ( Fig.…”