NDLI: Modelling and optimisation of planar matrix transformer for high frequency regulated LLC converter

Content Provider	IET Digital Library
Author	Wu, Liang Xiao, Long Zhao, Jun Chen, Guozhu
Abstract	For high-frequency high-current low-voltage applications, planar matrix transformer for unregulated LLC converter has been adopted to achieve high power density and high efficiency. Compared to unregulated LLC converter, the phase shift between the primary current and the secondary current of the matrix transformer is larger in regulated LLC converter as a result of lower magnetising inductance. Thus, the conventional winding loss model is not applicable to the matrix transformer for regulated LLC converter. Aiming at this problem, an accurately winding dc resistance model and an analytic winding ac resistance model are proposed in this study to calculate the winding loss of the matrix transformer. In addition, lower magnetising inductance also causes more serious fringing field near the air gap. Then, a calculation method to model the winding loss due to the fringing field is investigated. With the proposed model, design and optimisation of the matrix transformer for regulated LLC converter are described in detail subsequently. The proposed model is verified by a Gallium Nitride based 400 W LLC converter prototype with a power density of 443 W/in3 and a peak efficiency of 96.1%.
Starting Page	516
Ending Page	524
Page Count	9
ISSN	17554535
Volume Number	13
e-ISSN	17554543
Issue Number	Issue 3, Feb (2020)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-pel/13/3
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-pel.2019.0397
Journal	IET Power Electronics
Publisher Date	2019-12-10
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	Air Gap Analytic Winding AC Resistance Model Barkhausen Conventional Winding Loss Model Dc Resistance Model DC-DC Power Converter Gallium Compound High Power Density High-frequency High-current Low-voltage Application Hysteresi III-V SemiConductor Inductors And Transformer Lower Magnetising Inductance Magnetisation Magnetization Curves Optimisation Planar Matrix Transformer Power 400.0 W Power 443.0 W Power Converter Power Electronics Power Supplies to Apparatus Power Supply Regulated LLC Converter Resonant Power Converter Secondary Current Supervisory Circuit Transformer And Reactors Transformer Windings Unregulated LLC Converter Wide Band Gap SemiConductor
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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