NDLI: Multi-megahertz quasi-square-wave flyback converter using eGaN FETs

Content Provider	IET Digital Library
Author	Zhang, Zhemin Ngo, Khai D. T.
Abstract	As the fast development of the better figure-of-merits gallium nitride (GaN) devices, the switching frequency of isolated flyback converter could be pushed to multi-megahertz to evaluate the improvement of the power density. A constant frequency zero-voltage switching (ZVS) quasi-square-wave (QSW) mode is applied to the 30 W flyback in telecommunication application, and a charge conservation method including capacitor non-linearity is proposed to design the coupled inductors for soft switching over entire input and load range. Leakage inductance, eddy losses and parasitic capacitance were quantified and optimised in the design of high-frequency PCB windings. A 98% coupling planar-coupled inductors by utilising nickel-zinc ferrite material with EI-shaped core were designed by finite-element simulation. To validate all the analysis, a 30 W flyback converter was fabricated and measured with peak efficiency of 90.6% operating at 5 MHz. The coupled inductors consumed almost 2.5% of the output power with the area of 180 mm2 occupied 30% of the power stage.
Starting Page	1138
Ending Page	1146
Page Count	9
ISSN	17554535
Volume Number	10
e-ISSN	17554543
Issue Number	Issue 10, Aug (2017)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-pel/10/10
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-pel.2016.0782
Journal	IET Power Electronics
Publisher Date	2017-04-11
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	Capacitor Nonlinearity Charge Conservation Method Constant Frequency ZVS Quasi-square-wave Mode Eddy Loss FET Field Effect Device Field Effect Transistors Finite-element Simulation Gallium Compound High-frequency PCB Windings Insulated Gate Field Effect Transistors Leakage Inductance Multimegahertz Quasi-square-wave Flyback Converter Nickel-zinc Ferrite Material Parasitic Capacitance Power Converter Power Electronics Power Supplies to Apparatus Power Supply Soft Switching Supervisory Circuit Switching Converter Telecommunication Application Zero Voltage Switching
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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