NDLI: Analysis and implementation of a three-level hybrid dc–dc converter with the balanced capacitor voltages

Content Provider	IET Digital Library
Author	Lin, Bor Ren Zhang, Sheng Zhi
Abstract	In this study, a three-level hybrid dc/dc converter by integrating the full-bridge circuit, resonant circuit and three-level flying capacitor circuit is presented to achieve the main advantages of low-voltage stress of power devices, low circulating loss, low-voltage ringing on the rectifier diodes and low-output filter inductor for medium-voltage dc-based systems. Two full-bridge circuits are connected in series to effectively reduce the voltage stress of switches. Half-bridge resonant circuit shared the lagging-leg switches of full-bridge circuit is used and operated at fixed switching frequency to extend the zero-voltage switching (ZVS) range from low load to full load. Thus, the drawback of narrow ZVS range in the conventional full-bridge converter is improved. A flying capacitor is adopted to automatically balance input split capacitor voltages in each switching cycle without any additional active components or complexity control scheme. The circulating loss in the full-bridge circuit is reduced to zero by parallel connection of outputs of full-bridge circuit and half-bridge resonant circuits. Finally, the theoretical analysis and performance of the proposed converter are verified by the experiments with a 1.92 kW prototype circuit.
Starting Page	457
Ending Page	465
Page Count	9
ISSN	17554535
Volume Number	9
e-ISSN	17554543
Issue Number	Issue 3, Mar (2016)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-pel/9/3
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-pel.2015.0230
Journal	IET Power Electronics
Publisher Date	2016-03-09
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	Balanced Capacitor Voltage Bridge Circuit Conduction Loss Reduction Control of Electric Power System DC-DC Power Converter Field Effect Device Full-bridge Circuit Half-bridge Resonant Circuit Insulated Gate Field Effect Transistors Lagging-leg Switches Low Circulating Loss Low-output Filter Inductor Low-voltage Ringing Medium-voltage Dc-based System Output Voltage Regulation Phase-shift Pulse-width Modulation Power 1.9 KW Power Device Power Field Effect Transistors Power Inductors Power Metal-oxide-semiconductor Field-effect Transistors Power Semiconductor Device Power Semiconductor Switches PWM Power Converter Rectifier Rectifier Diode Switching Cycle Three-level Flying Capacitor Circuit Three-level Hybrid DC-DC Converter Transformer And Reactors Voltage Control Voltage Stress Reduction Zero Voltage Switching ZVS Range
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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