电子元件与材料2026，Vol.45Issue(1)：85-94,104,11.DOI:10.14106/j.cnki.1001-2028.2026.1411
含隔直电容的移相全桥变换器EMI抑制方案研究
Research on EMI suppression in a phase-shifted full-bridge converter with blocking capacitor
摘要
Abstract
In phase-shifted full-bridge converters,although the blocking capacitor can suppress transformer bias saturation,the high-frequency voltage components across it may aggravate the complexity of conducted electromagnetic interference(EMI).Furthermore,existing transformer models lack precision in revealing the resulting common-mode noise coupling mechanism.To address these issues,a two-capacitor equivalent transformer model was constructed based on the principle of displacement current conservation.The quantitative relationship between the internal displacement current paths and the inter-winding parasitic capacitances was characterized by this model.Subsequently,this model was utilized to simplify and analyze the common-mode interference circuit,based on which three synergistic suppression strategies were proposed.Experimental results from a 1400 W prototype demonstrate that the comprehensive suppression scheme reduces the common-mode noise resonance peak by approximately 20 dB within the frequency range of 150 kHz to 30 MHz.These results verify the correctness of the proposed two-capacitor transformer model and confirm the effectiveness of the comprehensive EMI suppression scheme designed based on it.关键词
隔直电容/电磁干扰/共模噪声/移相全桥/变压器模型/对消Key words
dc-blocking capacitor/electromagnetic interference/common-mode noise/phase-shifted full-bridge/transformer model/cancellation分类
信息技术与安全科学引用本文复制引用
贾红云,胡威,沈湛..含隔直电容的移相全桥变换器EMI抑制方案研究[J].电子元件与材料,2026,45(1):85-94,104,11.基金项目
国家自然科学基金青年基金项目(52207191) （52207191）
