A Flyback Converter with a Simple Passive Circuit for Improving Power Efficiency

This paper proposes an effective method to improve the power efficiency of the flyback converter in the continuous conduction mode (CCM). The proposed converter uses a simple passive circuit to reduce the switching power losses. The current through the output diode can be shifted to a new branch whe...

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Bibliographic Details
Published inEnergies (Basel) Vol. 17; no. 18; p. 4729
Main Author Choi, Woo-Young
Format Journal Article
LanguageEnglish
Published Basel MDPI AG 01.09.2024
Subjects
Circuits
continuous conduction mode
Diodes
Efficiency
Electric current converters
Electric transformers
Energy use
flyback converter
passive circuit
Performance evaluation
power efficiency
soft-switching
South Korea
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Summary:This paper proposes an effective method to improve the power efficiency of the flyback converter in the continuous conduction mode (CCM). The proposed converter uses a simple passive circuit to reduce the switching power losses. The current through the output diode can be shifted to a new branch where one diode, one inductor, and one auxiliary winding of the transformer are included. The output diode current can be reduced to zero for the zero-current switching of the output diode. The additional inductor is used to control the changing rate of the additional diode current to reduce the reverse-recovery current. Keeping the simplicity of the passive method, the proposed converter improves the power efficiency compared to the conventional converter. The circuit configuration and the operation principle are described. The design considerations are presented, including the simulation verification. The experimental results for a 45 W prototype are discussed to evaluate the performance of the proposed converter. The proposed converter has achieved a power efficiency of 93.5% for the rated load condition, improving the power efficiency. The applications of the proposed converter are also discussed for the future research directions.
ISSN:1996-1073
1996-1073
DOI:10.3390/en17184729