Contribution of leakage flux to the total losses in transformers with magnetic shunt

To execute soft switching methods in resonant power converters, transformers with larger leakage inductance are getting more attention. Many papers have constructed various concepts in this regard. However, a discussion about, how the transformer efficiency is affected is lacking in the literature....

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Bibliographic Details
Published in:International journal of electronics 2021-04, Vol.108 (4), p.558-573
Main Authors: Bakar, M. Abu, Haller, Stefan, Bertilsson, Kent
Format: Article
Language:English
Subjects:
Inductance
Integrated Leakage inductance
Integrated transformer
Leakage
leakage flux
leakage inductance loss
leakage loss
Power converters
power density
resonant converters
transformer losses
Transformers
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Summary:To execute soft switching methods in resonant power converters, transformers with larger leakage inductance are getting more attention. Many papers have constructed various concepts in this regard. However, a discussion about, how the transformer efficiency is affected is lacking in the literature. This paper analyses the effects of the increased leakage inductance on the performance of the transformer. A transformer for increased leakage inductance is modelled and constructed to investigate the losses. The model discusses the effects of increased leakage inductance either by increasing the inter-winding spacing or by integrating the magnetic shunt within the transformer. The investigations show that increasing the leakage inductance by inserting a magnetic shunt can have severe degrading effects on the performance of the transformer, if not designed adequately. Additional losses are also calculated and the effects are verified by the experiments.
ISSN:0020-7217
1362-3060
1362-3060
DOI:10.1080/00207217.2020.1793404