Low-Loss Integrated Inductor and Transformer Structure and Application in Regulated LLC Converter for 48-V Bus Converter

Ahmed, Mohamed H.; Nabih, Ahmed; Lee, Fred C.; Li, Qiang

doi:10.1109/jestpe.2019.2952878

Low-Loss Integrated Inductor and Transformer Structure and Application in Regulated LLC Converter for 48-V Bus Converter

Journal Article · Mon Nov 11 00:00:00 EST 2019 · IEEE Journal of Emerging and Selected Topics in Power Electronics

DOI:https://doi.org/10.1109/jestpe.2019.2952878· OSTI ID:2441440

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Virginia Polytechnic Institute and State University (Virginia Tech), Blacksburg, VA (United States); Virginia Polytechnic Institute and State University
Virginia Polytechnic Institute and State University (Virginia Tech), Blacksburg, VA (United States)

In this article, an LLC converter using gallium nitride (GaN) transistors is proposed for a 48-V regulated and isolated bus converter. Compared with pulsewidth modulation (PWM)-based topologies, the soft switching capability of an LLC allows operation at very high frequencies. In addition, the size of the magnetic components is reduced without sacrificing the efficiency. In this article, a novel magnetic structure that integrates a matrix transformer and inductor with minimum winding and a single magnetic core is proposed, to allow a high-density and high-efficiency LLC converter design for a bus converter. A 40-60-V input and regulated 12-V output converter is developed to deliver a 1-kW output power in a quarter brick form factor. Furthermore, the designed converter can achieve a power density of 700 W/in ³ with a maximum efficiency of 97.82% at half-load, dropping to 97.7% at full-load operation.

View Accepted Manuscript (DOE)

Research Organization:: Virginia Polytechnic Institute and State University (Virginia Tech), Blacksburg, VA (United States)

Sponsoring Organization:: USDOE Office of Energy Efficiency and Renewable Energy (EERE)

Grant/Contract Number:: EE0006521

OSTI ID:: 2441440

Alternate ID(s):: OSTI ID: 1799220

Journal Information:: IEEE Journal of Emerging and Selected Topics in Power Electronics, Journal Name: IEEE Journal of Emerging and Selected Topics in Power Electronics Journal Issue: 1 Vol. 8; ISSN 2168-6777

Publisher:: IEEECopyright Statement

Country of Publication:: United States

Language:: English

References (14)

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A high step-down non-isolated bus converter with partial power conversion based on synchronous LLC resonant converter Chen, Liqun; Wu, Hongfei; Xu, Peng 2015 IEEE Applied Power Electronics Conference and Exposition (APEC) https://doi.org/10.1109/APEC.2015.7104614	conference	March 2015
Design and magnetics optimization of LLC resonant converter with GaN Chen, Runruo; Brohlin, Paul; Dapkus, Don 2017 IEEE Applied Power Electronics Conference and Exposition (APEC) https://doi.org/10.1109/APEC.2017.7930678	conference	March 2017
48V to 12V isolated resonant converter with digital controller Zambetti, Osvaldo; Colombo, Mattia; D'angelo, Salvatore 2017 IEEE Applied Power Electronics Conference and Exposition (APEC) https://doi.org/10.1109/APEC.2017.7930711	conference	March 2017
High-efficiency high-power-density 48/1V sigma converter voltage regulator module Ahmed, Mohamed; Fei, Chao; Lee, Fred C. 2017 IEEE Applied Power Electronics Conference and Exposition (APEC) https://doi.org/10.1109/APEC.2017.7931005	conference	March 2017
Switched tank converters Jiang, Shuai; Nan, Chenhao; Li, Xin 2018 IEEE Applied Power Electronics Conference and Exposition (APEC) https://doi.org/10.1109/APEC.2018.8340992	conference	March 2018
Optimized Design of Integrated PCB-Winding Transformer for MHz LLC Converter Cai, Yinsong; Ahmed, Mohamed H.; Li, Qiang 2019 IEEE Applied Power Electronics Conference and Exposition (APEC) https://doi.org/10.1109/APEC.2019.8722181	conference	March 2019
High-efficiency, High-density Isolated/Regulated 48V Bus Converter with a Novel Planar Magnetic Structure Ahmed, Mohamed H.; Nabih, Ahmed; Lee, Fred C. 2019 IEEE Applied Power Electronics Conference and Exposition (APEC) https://doi.org/10.1109/APEC.2019.8722216	conference	March 2019
Simplified Optimal Trajectory Control for 1 MHz LLC Converter with Wide Input Voltage Range Nabih, Ahmed; Ahmed, Mohamed; Li, Qiang 2019 IEEE Applied Power Electronics Conference and Exposition (APEC) https://doi.org/10.1109/APEC.2019.8722275	conference	March 2019
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Design and Optimization of a 380V-12V High-Frequency, High-Current LLC Converter with GaN Devices and Planar Matrix Transformers Mu, Mingkai; Lee, Fred IEEE Journal of Emerging and Selected Topics in Power Electronics https://doi.org/10.1109/JESTPE.2016.2586964	journal	January 2016
High-Efficiency High-Power-Density LLC Converter With an Integrated Planar Matrix Transformer for High-Output Current Applications Fei, Chao; Lee, Fred C.; Li, Qiang IEEE Transactions on Industrial Electronics, Vol. 64, Issue 11 https://doi.org/10.1109/TIE.2017.2674599	journal	November 2017
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42 ENGINEERING
48-V bus converter
LLC converter
integrated magnetics
matrix transformer

Low-Loss Integrated Inductor and Transformer Structure and Application in Regulated LLC Converter for 48-V Bus Converter

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References (14)

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