An asymmetrical cancellation method for common mode voltage in full‐bridge LLC converter utilizing nonideal transformer

IF 1.8 3区工程技术 Q3 ENGINEERING, ELECTRICAL & ELECTRONIC

International Journal of Circuit Theory and Applications Pub Date : 2024-08-08 DOI:10.1002/cta.4217

Xinbo Liu, Shuiyuan He, Ruiqi Ma, Shibin Yang, Yuhang Xi, Lijun Diao

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引用次数: 0

Abstract

This paper proposes a common mode voltage (CMV) reduction method for power full‐bridge LLC converter. A detailed derivation of asymmetrical CMV source in energy transmission (ET) and dead time resonance (DR) is presented, and a common mode (CM) equivalent circuit model considering stray parameters of power devices and transformer for the high‐voltage power LLC converter is constructed. This study assesses the influence of asymmetric junction capacitances of power devices and stray capacitances of transformer on both the CMV source and the CM model. It also examines the impact of power level on the constituent elements of the CMV source. Additionally, a theory of asymmetric CMV source cancellation is deduced based on the nonideal power LLC converter, where asymmetric noise source and coupling pathway are taken into account, which helps mitigate it through matching circuit structure without extra components. Finally, a 30 kHz 2 × 50 kW prototype is constructed and validated to reduce the CMV where the experiments show that the output CMV within high‐frequency band could be reduced by 12.15 dB at rated operating conditions.

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利用非理想变压器的全桥 LLC 转换器共模电压非对称消除方法

本文提出了一种用于功率全桥 LLC 转换器的共模电压（CMV）降低方法。文中详细推导了能量传输 (ET) 和死区时间谐振 (DR) 中的非对称 CMV 源，并为高压功率 LLC 变换器构建了一个考虑了功率器件和变压器杂散参数的共模 (CM) 等效电路模型。本研究评估了功率器件不对称结电容和变压器杂散电容对 CMV 源和 CM 模型的影响。研究还探讨了功率水平对 CMV 源组成元素的影响。此外，还基于非理想功率 LLC 转换器推导出了非对称 CMV 源消除理论，其中考虑到了非对称噪声源和耦合途径，这有助于通过匹配电路结构（无需额外元件）缓解非对称 CMV 源。最后，构建并验证了一个 30 kHz 2 × 50 kW 原型，以降低 CMV，实验表明，在额定工作条件下，高频段内的输出 CMV 可降低 12.15 dB。

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

International Journal of Circuit Theory and Applications 工程技术-工程：电子与电气

CiteScore

3.60

自引率

34.80%

发文量

277

审稿时长

4.5 months

期刊介绍： The scope of the Journal comprises all aspects of the theory and design of analog and digital circuits together with the application of the ideas and techniques of circuit theory in other fields of science and engineering. Examples of the areas covered include: Fundamental Circuit Theory together with its mathematical and computational aspects; Circuit modeling of devices; Synthesis and design of filters and active circuits; Neural networks; Nonlinear and chaotic circuits; Signal processing and VLSI; Distributed, switched and digital circuits; Power electronics; Solid state devices. Contributions to CAD and simulation are welcome.