An Accurate Dynamic Time-Domain Model for LLC Resonant Converter by Considering Nonideal Components, Various Modulation Strategies, and Dynamic Process
发布时间：2026-07-07
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- 发布时间：
- 2026-07-07
- 论文名称：
- An Accurate Dynamic Time-Domain Model for LLC Resonant Converter by Considering Nonideal Components, Various Modulation Strategies, and Dynamic Process
- 发表刊物：
- IEEE Journal of Emerging and Selected Topics in Power Electronics
- 摘要：
- In order to improve the performance of inductor-inductor–capacitor (LLC) resonant converters in wide voltage range applications, many novel modulation strategies other than traditional pulse-frequency modulation (PFM) have been proposed, such as pulsewidth modulation (PWM) and phase shift modulation (PSM). However, the existing modeling method cannot be extended to other modulation methods easily. In most cases, the existing models are developed based on the assumption of ideal components, which neglect parasitic components and dead time effect. Practically, these nonideal factors have a significant influence on the steady-state operation and the soft-switching performance. Besides, due to the complexity and nonlinearity of the operation process, it is difficult to conduct the small-signal analysis. In this article, an accurate dynamic time-domain model is developed based on stage iteration, considering common parasitic components, the dead time effect, and various modulation methods. It can reflect the implementation of zero voltage switching (ZVS) and the high-frequency oscillation under the light load. Based on the improved dynamic model, a convenient and accurate small-signal analysis method is proposed. Simulation and experimental results are presented to verify the accuracy of the model. Compared to the traditional model, the relative error of the voltage gain can be reduced from 14.2% to 5.0%.
- 第一作者：
- 张硕
- 是否译文：
- 否