A digitally controlled DCM flyback converter with a low-volume dual-mode soft switching circuit

Mahdavikhah, Behzad; Prodić, Aleksandar

doi:10.1109/apec.2014.6803290

Cited by 5 publications

(1 citation statement)

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“…Flyback converters feature an isolated DC-DC conversion at lowest possible part count and are one of the very basic, standard power electronic circuits. Despite that fact, the flyback converter is still subject of various recent research publications aiming to improve the performance of the flyback converter in various ways, such as advanced soft switching techniques [2], online efficiency optimized control or additional clamping circuits [3]. This continuing interest in the flyback converter is caused by emerging renewable energy applications, such as PV micro inverters, which demand for isolated high step-up converters with high reliability and low cost at high efficiency.…”

Section: Introductionmentioning

confidence: 99%

Accurate and computationally efficient modeling of flyback transformer parasitics and their influence on converter losses

Leuenberger

Biela

2015

2015 17th European Conference on Power Electronics and Applications (EPE'15 ECCE-Europe)

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Emerging renewable energy applications, such as PV micro inverters, demand for high step-up isolated DC-DC converters with high reliability and low cost, at high efficiency. Thanks to its low part-count the flyback converter is an optimal candidate for such applications. To achieve high efficiency over a wide load range, a decent transformer design must be performed, considering also the effects of the transformer parasitics. Therefore this work analyzes the influence of the transformer parasitic capacitances and leakage inductance in such a way, that it presents a complete tool to consider the transformer parasitics in the flyback-converter design process. A loss-analysis is performed for all three operation modes of the flyback-converter and methods for modeling the parasitic elements are discussed. To model the frequency dependence of the leakage inductance a new method is proposed. The applied models are explained in-depth and verified with measurements on prototype transformers. Figure 1: a) GaN/SiC high step-up flyback-converter prototype for PV micro-inverter, b) Two-port transformer, general parasitics equivalent circuit, [1]

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Section: Introductionmentioning

confidence: 99%