Enhanced Small-Signal Model for Charge-Controlled LLC Resonant Converters Using Time-Domain Analysis

IF 4.9 2区工程技术 Q2 ENGINEERING, ELECTRICAL & ELECTRONIC

IEEE Transactions on Circuits and Systems II: Express Briefs Pub Date : 2025-08-06 DOI:10.1109/TCSII.2025.3596316

Wenzhe Chen;Kangli Liu;Hongqi Ding;Yichao Sun;Cheng Jin;Pengyu Wang;Jianfeng Zhao

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引用次数: 0

Abstract

The conventional models employ fundamental harmonic approximation for charge-controlled LLC resonant converter. However, when the switching frequency deviates from the resonant frequency, significant distortion occurs in the state variables, leading to degraded accuracy in the models. To address this issue, this brief proposes a novel small-signal modeling approach based on time-domain analysis. The proposed method first derives the simplified time-domain operating constraints for the converter. The simplified constraints relieve the computation burden and reduce the number of intermediate variables, making it more suitable for small-signal modeling. Next, the relationships between small-signal variables are derived from these constraints. Finally, a complete mathematical model of the charge-controlled LLC resonant converter is constructed. Experimental validation is performed on a 200V/1kW LLC resonant converter prototype. Both simulation and experimental results confirm the superior accuracy of the proposed model.

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基于时域分析的电荷控制LLC谐振变换器增强小信号模型

电荷控制LLC谐振变换器的传统模型采用基次谐波近似。然而，当开关频率偏离谐振频率时，状态变量会发生明显的畸变，导致模型精度下降。为了解决这个问题，本文提出了一种基于时域分析的小信号建模方法。该方法首先推导了变换器的简化时域运行约束。简化的约束减轻了计算负担，减少了中间变量的数量，使其更适合于小信号建模。接下来，从这些约束推导出小信号变量之间的关系。最后，建立了电荷控制LLC谐振变换器的完整数学模型。在200V/1kW LLC谐振变换器样机上进行了实验验证。仿真和实验结果均证实了该模型具有较高的精度。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

IEEE Transactions on Circuits and Systems II: Express Briefs 工程技术-工程：电子与电气

CiteScore

7.90

自引率

20.50%

发文量

883

审稿时长

3.0 months

期刊介绍： TCAS II publishes brief papers in the field specified by the theory, analysis, design, and practical implementations of circuits, and the application of circuit techniques to systems and to signal processing. Included is the whole spectrum from basic scientific theory to industrial applications. The field of interest covered includes: Circuits: Analog, Digital and Mixed Signal Circuits and Systems Nonlinear Circuits and Systems, Integrated Sensors, MEMS and Systems on Chip, Nanoscale Circuits and Systems, Optoelectronic Circuits and Systems, Power Electronics and Systems Software for Analog-and-Logic Circuits and Systems Control aspects of Circuits and Systems.