本文選題：開關電源 + 共模傳導EMI�。� 參考：《西安理工大學》2017年碩士論文

【摘要】：隨著開關電源開關頻率及功率密度的提高,開關電源的傳導EMI問題尤為突出與重要。作為耦合通道環(huán)節(jié)的開關電源中的變壓器分布電容參數(shù)以及接地阻抗會對傳導EMI產生影響。本文針對這兩個問題進行研究。首先對開關電源的傳導EMI流通路徑進行了分析,建立了開關電源共模傳導EMI模型。通過該模型分析了變壓器原副邊分布電容以及接地阻抗對共模傳導EMI電流的影響�？梢钥闯�,隨著分布電容的增大,共模電流增大。而隨著接地阻抗的增大,共模干擾電流在減小。所以,需要研究如何減小分布電容及其接地阻抗對傳導EMI的影響。本文建立了考慮到變壓器原副邊所有匝數(shù)之間的分布電容的變壓器分布電容網絡結構模型。并且提出了一種基于MAXWELL軟件的變壓器分布電容網絡模型參數(shù)提取方法,通過該方法與建模方法結合可以求出變壓器的分布電容。然后通過二端口網絡法實驗提取出變壓器的分布電容,將兩者進行對比,驗證了該建模方法的正確性。并采用分段繞制方法減小變壓器的原副邊之間分布電容,進而降低開關電源傳導EMI。分別通過仿真與實驗驗證了分段繞制方法可以減小開關電源的傳導EMI。同時,本文針對大功率電源柜體作為接地體,仿真分析了其面板上的阻抗,分別驗證了頻率對其阻抗的影響,面板上開孔形狀與尺寸對阻抗的影響,以及面板上開孔位置布局不同對接地柜體上阻抗的影響。通過對比不同的面板上的布局情況下的接地阻抗,分析了面板上開孔布局對接地阻抗的影響。
[Abstract]:With the increase of switching frequency and power density, the conduction EMI problem of switching power supply is becoming more and more important. The distributed capacitance parameters and grounding impedance of the transformer in the switching power supply, which is the link of the coupling channel, will affect the conduction EMI. This paper studies these two problems. Firstly, the conduction EMI circulation path of switching power supply is analyzed, and the common-mode conduction EMI model of switching power supply is established. Based on the model, the influence of the primary side capacitance and grounding impedance of transformer on the common-mode conduction EMI current is analyzed. It can be seen that the common-mode current increases with the increase of the distributed capacitance. The common-mode interference current decreases with the increase of grounding impedance. Therefore, it is necessary to study how to reduce the influence of distributed capacitance and grounding impedance on conductive EMI. In this paper, a distributed capacitance network model of transformer considering the distributed capacitance between all turns of the primary and secondary edges of a transformer is established. A method of extracting the parameters of transformer distributed capacitance network model based on MAXWELL software is proposed. The distributed capacitance of transformer can be obtained by combining this method with the modeling method. Then the distributed capacitance of transformer is extracted by two-port network method, and the correctness of the modeling method is verified by comparing the two methods. The distributed capacitance between the primary and secondary edges of the transformer is reduced by using the piecewise winding method, and then the conduction EMIs of the switching power supply are reduced. The results of simulation and experiment show that the piecewise winding method can reduce the conduction EMIs of the switching power supply. At the same time, the impedance on the panel is simulated and analyzed, and the influence of frequency on the impedance is verified, and the influence of the shape and size of the opening hole on the impedance of the panel is verified. And the influence of the location of the opening on the panel on the impedance of the earthing cabinet. By comparing the grounding impedance of different panel configurations, the influence of the hole layout on the earthing impedance is analyzed.
【學位授予單位】：西安理工大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TN86

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