A Single-Stage Asymmetrical Half-Bridge Flyback Converter with Resonant Operation

Chung-Yi Ting, Yi-Chieh Hsu, Jing-Yuan Lin and Chung-Ping Chen
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Chung-Yi Ting: Graduate Institute of Electronics Engineering, National Taiwan University, Taipei 106, Taiwan
Yi-Chieh Hsu: Graduate Institute of Electronics Engineering, National Taiwan University, Taipei 106, Taiwan
Jing-Yuan Lin: Department of Electronic and Computer Engineering, National Taiwan University of Science and Technology, Taipei 106, Taiwan
Chung-Ping Chen: Graduate Institute of Electronics Engineering, National Taiwan University, Taipei 106, Taiwan

Energies, 2018, vol. 11, issue 7, 1-16

Abstract: This paper proposes a single-stage asymmetrical half-bridge fly-back (AHBF) converter with resonant mode using dual-mode control. The presented converter has an integrated boost converter and asymmetrical half-bridge fly-back converter and operates in resonant mode. The boost-cell always operates in discontinuous conduction mode (DCM) to achieve high power factor. The presented converter operates simultaneously using a variable-frequency-controller (VFC) and pulse-width-modulation (PWM) controller. Unlike the conventional single-stage design, the intermediate bus voltage of this controller can be regulated depending on the main power switch duty ratio. The asymmetrical half-bridge fly-back converter utilizes a variable switching frequency controller to achieve the output voltage regulation. The asymmetrical half-bridge fly-back converter can achieve zero-voltage-switching (ZVS) operation and significantly reduce the switching losses. Detailed analysis and design of this single-stage asymmetrical half-bridge fly-back converter with resonant mode is described. A wide AC input voltage ranging from 90 to 264 V rms and output 19 V/120 W prototype converter was built to verify the theoretical analysis and performance of the presented converter.

Keywords: fly-back converter; zero-voltage-switching (ZVS); variable-frequency-controller (VFC); single-stage (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2018
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