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Small-Signal Modeling of Asymmetric PWM Control Based Series Resonant Converter

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Gepubliceerd in:Electronics vol. 14, no. 17 (2025), p. 3394-3409
Hoofdauteur: Park Gwang-Min
Andere auteurs: Kui-Jun, Lee
Gepubliceerd in:
MDPI AG
Onderwerpen:
Asymmetry
Approximation
Photodegradation
Transfer functions
Efficiency
Pulse duration modulation
Pulse frequency modulation
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Samenvatting:This paper presents a small-signal model of a series resonant converter under continuous conduction mode, based on asymmetric pulse-width modulation, which is commonly used under light-load conditions. When controlled using conventional pulse-frequency modulation, the series resonant converter (SRC) suffers from insufficient resonant current under light loads, leading to degraded soft-switching performance, increased switching losses, and reduced efficiency due to the need for higher switching frequencies to maintain output regulation. To address these issues, the asymmetric pulse-width modulation with a fixed switching frequency is required to improve efficiency. In this study, a small-signal model is derived using the Extended Describing Function method. Based on this model, transfer functions are obtained and verified through MATLAB(R2024a), switching model-based PLECS(4.7.5) simulations, and experimental results.
ISSN:2079-9292
DOI:10.3390/electronics14173394
Bron:Advanced Technologies & Aerospace Database