基于三绕组耦合电感与改进型开关电容的单开关高增益DC-DC变换器

doi:10.19595/j.cnki.1000-6753.tces.251069

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摘要

针对非隔离型DC-DC变换器升压能力不足及开关器件应力过大的缺陷,提出了基于三绕组耦合电感与改进型开关电容的单开关高增益DC-DC变换器。该变换器通过将传统Boost变换器中的输入电感替换为三绕组耦合电感,并利用开关电容与无源钳位支路吸收漏感能量。在此基础上,进一步将开关电容单元与无源钳位支路融合,构建出一种兼具能量吸收与高增益特性的改进型倍压结构,在提升变换器整体升压能力的同时,抑制了漏感能量对半导体器件的器件冲击。此外,通过利用漏感实现开关管的零电流开通,同时延缓二极管电流变化率缓解了其反向恢复问题。本文详细分析了变换器的工作模式与主要波形,推导出各项性能参数。最后,搭建了一台400?W实验样机,验证理论分析的正确性。

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	李超
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关键词 ：单开关高增益变换器, 改进型开关电容, 三绕组耦合电感, 零电流开通

Abstract：

To address the practical limitations of non-isolated DC-DC converters, including insufficient voltage step-up capability, high voltage stress on switches, and relatively low efficiency, this paper proposes a high gain single-switch DC-DC converter based on a three-winding coupled inductor (TWCI) and a modified switched-capacitor (HSS-TWCI-MSC). In the proposed topology, the input inductor of the conventional Boost converter is replaced by a TWCI, and a switched-capacitor is integrated with a passive clamping branch to form a novel voltage multiplier cell. This structure significantly enhances voltage gain while effectively absorbing leakage energy from the leakage inductor, thereby reducing voltage stress on the switch and diodes. Furthermore, the leakage inductor of the TWCI enables zero-current switching (ZCS) for switch, which helps reduce switching losses and mitigates the reverse recovery issue of diodes, thus improving the overall system efficiency and reliability.
The paper provides a theoretical analysis of the proposed converter and its operating modes under continuous conduction modes. The key performance metrics such as voltage gain, voltage/current stresses, and RMS currents are derived. Additionally, the boundary condition of the proposed converter in DCM is analyzed, and an expression for the critical magnetizing inductor is presented. Moreover, the comprehensive loss analysis is established, evaluating the dominant loss contributions from the switch, diodes, capacitors, and magnetic components. A performance comparison with several state-of-the-art high-gain converters in the references reveals that the proposed converter achieves higher voltage gain with lower voltage stress and a more compact structure under the same input and output conditions.
To validate the theoretical analysis and assess the practical feasibility, a 400?W laboratory prototype was designed and implemented with an input voltage of 36?V, output voltage of 400?V, and a switching frequency of 50?kHz. Experimental results demonstrate that the proposed converter achieves a peak efficiency of 97.20% under 250W load and maintains an efficiency of 96.92% at full load. Measured waveforms confirm key characteristics such as ZCS operation of the switch and low voltage stress. Furthermore, loss distribution analysis shows that the majority of losses are concentrated in the diodes and magnetic components, suggesting that further improvements can be achieved through optimized component selection and magnetic design refinement.
In summary, the proposed HSS-TWCI-MSC converter offers several compelling advantages: (1) By organically integrating the switched-capacitor used to absorb the leakage energy from the TWCI with a passive clamping branch, a novel voltage multiplier cell is constructed. This configuration not only effectively enhances the voltage gain but also significantly suppresses the voltage stress on semiconductor devices. (2) By combining the TWCI with the modified switched-capacitor, the proposed HSS-TWCI-MSC achieves high voltage gain while maintaining low voltage stress, thereby enabling the use of cost-effective and high-performance components. (3) By utilizing the leakage inductor of TWCI, the switch achieves ZCS turn-on, effectively reducing switching losses. Meanwhile, the leakage inductor also limits the current falling rate of diodes, alleviating their reverse recovery issues and reducing associated losses, thereby improving overall system efficiency. (4) The proposed HSS-TWCI-MSC converter employs only one switch, resulting in a simple control strategy that is beneficial for system implementation and stable operation.

Key words： High gain single-switch converter modified switched-capacitor three-winding coupled inductor zero current switching

收稿日期: 2025-06-18

PACS:

TM46

基金资助:

国家自然科学基金（52477191）和辽宁省自然科学基金博士科研启动项目（2024-BS-255）资助

通讯作者: 李洪珠男,1974年生,博士,教授,研究方向为电力电子及其磁集成技术。E-mail：lhz_98@163.com

作者简介: 李超男,1999年生,博士研究生,研究方向为电力电子与电能变换。E-mail：chaoli_lc@163.com

引用本文:

李超, 李洪珠, 孙瑄瑨. 基于三绕组耦合电感与改进型开关电容的单开关高增益DC-DC变换器[J]. 电工技术学报, 0, (): 20251069-20251069. Li Chao, Li Hongzhu, Sun Xuanjin. High Gain Single-Switch DC-DC Converter with Three-Winding Coupled Inductor and Modified Switched-Capacitor. Transactions of China Electrotechnical Society, 0, (): 20251069-20251069.

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