Three-Level DNPC-LLC Converter With Hybrid Modulation Method for Wide Output Voltage Applications

IF 5 Q1 ENGINEERING, ELECTRICAL & ELECTRONIC

IEEE open journal of power electronics Pub Date : 2025-02-07 DOI:10.1109/OJPEL.2025.3539667

Ming-Shi Huang;Jhih-Cheng Hu;Shih-Gang Chen;Wei-Hsiang Hsu;Chun-Wei Huang

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Abstract

Three-level diode-neutral-point-clamped (DNPC)-LLC resonant converter is usually utilized for high input voltage applications, whereas its output voltage is regulated using three-level (3L) modulation method. However, 3L modulation makes it difficult to address the requirement of a wide output voltage range. Therefore, this paper presents a hybrid modulation method for the DNPC-LLC converter, incorporating the traditional 3L modulation and a proposed two-level (2L) modulation, which allows lower output voltages, reduces the switching frequency and the number of switching operations of the primary-side switches. Furthermore, the operating principles and voltage gains of both modulation methods are analyzed. Finally, a 3.7 kW SiC-based DNPC-LLC converter with synchronous rectification at an 800 V input is implemented. The output voltage ranges from 20 V to 450 V, and smooth transitions between different modulation modes are verified. The proposed converter achieves a maximum efficiency of 97.3% at an output of 360 V and 10.3 A. Furthermore, compared to the 3L method, the 2L method improves efficiency by at least 0.5% when the output voltage is below 200 V. Additionally, the voltage balance between two series dc-link capacitors is fulfilled after applying voltage balancing control.

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三电平二极管中性点钳位（DNPC）-LLC 谐振转换器通常用于高输入电压应用，而其输出电压则采用三电平（3L）调制方法进行调节。然而，3L 调制很难满足宽输出电压范围的要求。因此，本文为 DNPC-LLC 转换器提出了一种混合调制方法，它结合了传统的 3L 调制和建议的两电平 (2L) 调制，可实现更低的输出电压，降低开关频率和一次侧开关操作次数。此外，还分析了两种调制方法的工作原理和电压增益。最后，实现了一个基于碳化硅的 3.7 千瓦 DNPC-LLC 转换器，在 800 V 输入电压下进行同步整流。输出电压范围为 20 V 至 450 V，并验证了不同调制模式之间的平滑转换。此外，与 3L 方法相比，当输出电压低于 200 V 时，2L 方法的效率至少提高了 0.5%。此外，在应用电压平衡控制后，两个串联直流链路电容器之间的电压平衡得以实现。

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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