A High-Switching-Frequency Flyback Converter in Resonant Mode

The demand of miniaturization of power systems has accelerated the research on high-switching-frequency power converters. A flyback converter in resonant mode that features low switching losses, less transformer losses, and low switching noise at high switching frequency is investigated in this pape...

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Bibliographic Details
Published in:IEEE transactions on power electronics 2017-11, Vol.32 (11), p.8582-8592
Main Authors: Jianting Li, van Horck, Frank B. M., Daniel, Bobby J., Bergveld, Henk Jan
Format: Article
Language:English
Subjects:
Capacitors
Core loss
Diode snubbers
Electromagnetic interference
Electronics
Flyback
high switching frequency
Inductance
Leakage
Miniaturization
Power converters
regenerative snubber
resonant power conversion
Silicon
Snubbers
Switches
Switching
Switching frequency
Switching loss
Topology
Transformers
Windings
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Summary:The demand of miniaturization of power systems has accelerated the research on high-switching-frequency power converters. A flyback converter in resonant mode that features low switching losses, less transformer losses, and low switching noise at high switching frequency is investigated in this paper as an alternative to a conventional quasi-resonant (QR) flyback topology to increase power density. In order to find a compromise between magnet size, electromagnetic interference (EMI), and efficiency, the concept utilizes the resonant behavior between transformer leakage inductance and snubber capacitor to achieve near-zero-voltage switching at both turn-on and turn-off of the primary switch, low core loss due to a continuous transformer magnetizing current, and reduced EMI due to low di/dt and dv/dt values. Meanwhile, the concept uses the regenerative snubber to recycle the transformer leakage energy with two snubber diodes and one snubber capacitor. The proposed concept has been validated on a 340-kHz 65-W prototype. Compared to the conventional QR flyback converter operating at the same switching frequency, the proposed concept has 2% efficiency improvement and better EMI performance.
ISSN:0885-8993
1941-0107
DOI:10.1109/TPEL.2016.2642044