4.8 Article

Design Methodology of Quasi-Resonant Flyback Converter With a Divided Resonant Capacitor

Journal

IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
Volume 68, Issue 11, Pages 10796-10805

Publisher

IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TIE.2020.3029481

Keywords

Capacitors; Snubbers; Power conversion; Clamps; Switches; Design methodology; Inductance; Flyback converter; leakage inductance; power conversion efficiency; resonant capacitor; snubber circuit; voltage spike

Funding

  1. National Research Foundation of Korea (NRF) - Korea government(MSIT) [NRF-2019R1A2B5B01069665]
  2. Research and Development Program of the Korea Institute of Energy Research [C0-2411]

Ask authors/readers for more resources

A quasi-resonant flyback converter with a divided resonant capacitor is proposed to suppress voltage spikes and improve power conversion efficiency. The operational principle of the divided resonant capacitor is analyzed and validated through experiments. The proposed design effectively reduces voltage spikes and improves power conversion efficiency.
The leakage inductance in flyback converters can induce high-voltage spikes in power switches as well as power losses. Although conventional resistor-capacitor-diode (RCD) snubbers and active clamp circuits can be used to suppress these voltage spikes, the clamping operation of RCD snubbers increases power consumption, while the active clamps require additional power switches. To address these issues, a quasi-resonant flyback converter featuring a divided resonant capacitor is proposed in this article, in order to suppress voltage spikes in power switches and improve the power conversion efficiency. The operational principle of a divided resonant capacitor is analyzed to obtain the design methodology of the divided resonant capacitor. Furthermore, the validity of the proposed design method is verified via experiments, using 15-W prototype quasi-resonant flyback converter. The results indicate that the proposed design effectively reduces voltage spikes and improves power conversion efficiency.

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