Abstract
The transformer design impact on voltage spikes, which arise on the drain of flyback converter MOSFET switch transistor, has been investigated. The special experimental model of flyback transformer was developed. The impact of transformer core air gap, windings design and windings position in transformer bobbin on the voltage spikes was investigated. The ways for reduction of voltage spikes by variation of transformer design were estimated. DOI: http://dx.doi.org/10.5755/j01.eie.22.5.16345
Highlights
The disadvantage of low power switched mode flyback converter is leakage inductance phenomenon of flyback transformer [1]–[3]
The purpose of this work is to investigate the impact of flyback transformer design on voltage spikes in converter caused by the leakage inductance
The leakage inductance is proportional to magnetomotive force between the windings that acts in air gap of core [5] (Fig. 2)
Summary
The disadvantage of low power switched mode flyback converter is leakage inductance phenomenon of flyback transformer [1]–[3]. It causes increase of voltage spikes generated during the switch commutation. The energy consumed for generation of voltage spikes lowers the efficiency of flyback converter [1]–[8]. The theoretical analysis or simulation means are used usually for analysis of flyback transformer design impact on voltage spikes [1]–[6]. It is complicated to determine the values of transformer model parameters. The purpose of this work is to investigate the impact of flyback transformer design on voltage spikes in converter caused by the leakage inductance. The investigation was performed for cases when transformer windings are placed using interleaving and sandwich methods [1] and two methods proposed by authors
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