High-Frequency Transformer Design With Medium-Voltage Insulation for Resonant Converter in Solid-State Transformer
High-Frequency Transformer Design With Medium-Voltage Insulation for Resonant Converter in Solid-State Transformer
复制标题
用于固态变压器谐振转换器的中压绝缘高频变压器设计
DOI：
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发表时间：
2023
影响因子：
6.7
通讯作者：
F. Lee
中科院分区：
文献类型：
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作者：
Zheqing Li;E. Hsieh;Qiang Li;F. Lee
固态Transformer可以直接将中压转换为低压（例如，400 V），具有最小化的功率转换级。DC-DC模块中的Transformer不仅提供中压绝缘，而且显著影响模块的功率密度。在这篇文章中，提出了一种创新的紧凑型Transformer结构，使用环氧树脂，线轴，屏蔽层和应力控制层的绝缘协调来处理中压绝缘。全新的线圈架设计和相关的制造工艺确保了无局部放电的绝缘。除了传统的铁损和绕组损耗，高频相关的铁损和屏蔽损耗进行了详细的建模准确的损失评估。提出了一个简单而全面的多参数、多目标优化过程，以实现尺寸和损耗的折衷。Transformer样机通过了相关的绝缘测试，符合IEEE Std. C57.12.01.最后，该设计在15 kW，200 kHz CLLC转换器上进行了验证，峰值效率为98.9%，功率密度为3.8 kW/L。
A solid-state transformer can directly convert medium voltage to low voltage (e.g., 400 V) with minimized power-conversion stages. The transformer in the dc–dc module not only provides medium-voltage insulation but also significantly affects the power density of the module. In this article, an innovative compact transformer structure is proposed to handle medium-voltage insulation using an insulation coordination with epoxy, bobbin, shielding layer, and stress-control layer. A brand-new bobbin design and related fabrication process ensures a partial-discharge-free insulation. Besides the traditional core loss and winding loss, high-frequency-related core loss and shielding loss are modeled in detail for the accurate loss evaluation. A simple and comprehensive multiparameter, multiobjective optimization process is proposed to achieve the size and loss tradeoff. The transformer prototype passes the related insulation tests, following the standard IEEE Std. C57.12.01. Finally, the design is demonstrated on a 15 kW, 200 kHz CLLC converter with 98.9% peak efficiency and 3.8 kW/L power density.