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A Generalized Time-Domain Modeling of Dual-Bridge Series Resonant Converters for Control Performance Improvement
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DOI：10.1109/JESTIE.2026.3660259.png)
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Abstract
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Dual-bridge series resonant converters (DBSRCs) are promising solutions to interface energy storage modules with DC-bus flexibly. To compensate for the defect that the fundamental harmonic approximation (FHA) model has high accuracy only near the resonant frequency point, a generalized time-domain model (the G-TDA model) is proposed for DBSRCs, which can accurately describe operating characteristics and transmission power of DBSRCs. In addition, the evolving time-domain models of other symmetric phase-shift modulations are derived from the G-TDA model. Compared with the FHA model, the G-TDA model can predict the resonant current behavior and zero-voltage-switching (ZVS) conditions with higher accuracy. Then, the relationship between backflow power and resonant current is discussed, the backflow power optimization performance is closely related to the prediction accuracy of the resonant current behavior. Besides, dead time effects are analyzed when switching devices achieve/lose ZVS, which is closely related to ZVS conditions. Finally, comparative experiments of optimization methods based on the FHA model and the G-TDA model are carried out, better control performance of the backflow power optimization and the dead time compensation can be achieved due to the higher accuracy of the G-TDA model, such as zero-backflow power optimization, all switching devices ZVS, and efficiency improvement of DBSRCs.
Keywords:
Zero voltage switching
Accuracy
Analytical models
Mathematical models
Switches
Time-domain analysis
Harmonic analysis
Resonant converters
Predictive models
Capacitors
Control performance improvement
dual-bridge series resonant converter (DBSRC)
energy conversion
power interface converters
time-domain modelling
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