Modeling and Reduction of Radiated EMI due to Ground Impedance in a High-density Active-clamp Flyback Power Adapter
Modeling and Reduction of Radiated EMI due to Ground Impedance in a High-density Active-clamp Flyback Power Adapter
复制标题
高密度有源钳位反激式电源适配器中接地阻抗引起的辐射 EMI 的建模和降低
DOI：
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发表时间：
2022
期刊：
影响因子：
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通讯作者：
Srikanth Lakshmikanthan
中科院分区：
文献类型：
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作者：
Zhedong Ma;Shuo Wang;H. Sheng;Srikanth Lakshmikanthan
本文首先回顾了有源钳位反激式（ACF）电源适配器中辐射电磁干扰（EMI）的建模和预测技术。其次，基于电路拓扑、PCB寄生效应、工作电压波形、天线/转换器阻抗和传递函数，开发了ACF电源适配器的改进辐射EMI模型。第三，对改进的辐射EMI模型进行了量化和实验验证。第四，基于改进的辐射EMI模型提出了两种降低辐射EMI的技术：优化PCB布局和添加用于谐振的交叉电容器。实验验证了分析和技术。该技术还扩展到其他隔离式电源转换器拓扑。
The article firstly reviewed the modeling and prediction techniques for radiated electromagnetic interference (EMI) in active-clamp Flyback (ACF) power adapters. Second, developed an improved radiated EMI model of the ACF power adapter based on circuit topologies, PCB parasitics, working voltage waveforms, antenna/converter impedance, and transfer functions. Third, the improved radiated EMI model was quantified and experimentally verified. Fourth, proposed two techniques for radiated EMI mitigation based on the improved radiated EMI model: optimizing PCB layout and adding a cross capacitor for resonance. Experiments verified the analysis and techniques. The techniques were also extended to other isolated power converter topologies.