Contribution of leakage flux to the total losses in transformers with magnetic shunt. Issue 4 (3rd April 2021)

• Record Type: Journal Article
• Authors: Bakar, M. Abu; Haller, Stefan; Bertilsson, Kent
• Is Part Of: International journal of electronics. Volume 108:Issue 4(2021)
• Page Start: 558
• Page End: 573
• Publication Date: 2021-04-03
• Subjects: Integrated transformer -- power density -- leakage inductance loss -- transformer losses -- leakage flux -- resonant converters; Electronics -- Periodicals; Electronic control -- Periodicals; 621.381
• DOI: 10.1080/00207217.2020.1793404
• Languages: English
• ISSNs: 0020-7217

Abstract

ABSTRACT: 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.