THREE-WINDING COUPLED INDUCTOR-BASED HIGH STEP-UP QUASI-Z-SOURCE DC-DC CONVERTER
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摘要: 针对清洁能源并网发电系统中直流升压变换器的现有技术缺陷，提出一种新型的准Z源高升压DC-DC变换器。该变换器通过将准Z源网络与独特的耦合电感集成结构结合，能在较低的占空比和匝比下实现高电压增益。拓扑中的钳位回路回收了储存在耦合电感漏感中的能量，能有效缓解耦合电感漏感引起的尖峰电压。此外，变换器功率器件电压应力水平较低，便于使用低耐压器件来提高转换效率。输入电流连续以及输入输出共地的特点使得该变换器适合应用于可再生能源场景。详细介绍了所提变换器的工作原理，给出了关键性的公式推导和设计依据，并进行性能比较。最后，设计并搭建一台200 W额定功率的样机进行实验验证，实验结果与理论分析相吻合。Abstract: Aiming at the existing technical defects of DC boost converter in clean energy grid-connected power generation system, this paper proposed a novel high step-up quasi-Z-source DC-DC converter. By combining the quasi-Z-source network with a unique coupled inductor integrated structure, the proposed converter can achieve high voltage gain at small duty cycle and turns ratio. The clamp circuit utilized in the topology can recover the energy stored in the leakage inductor and effectively suppress the voltage spike caused by the leakage inductor. In addition, the voltage stress of the power components is low, therefore low rating devices can be used to improve the conversion efficiency. Continuity of input current and common ground between input source and output load make the converter more suitable for renewable energy applications. The operation principle is analyzed, and critical formulas and design are presented. Then the performance comparison with other converters is discussed. Finally, a 200 W rated power prototype was designed and established for experimental verification, and the experimental results match the theoretical analysis.
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Keywords:
- DC-DC converters /
- gain regulation /
- coupled circuits /
- three-winding /
- quasi-Z-source
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