半隔离DC/DC开关电源传导电磁干扰预测与抑制研究

发布时间：2021-10-29 22:42

　　由于开关电源具有效率高、功率密度高、体积小、重量轻等优点,因此被广泛地应用于程控交换、光数据传输、无线基站、有线电视系统及IP网络中。当今通信开关电源多采用单端双端电路、半桥电路和全桥电路等拓扑,在中小功率场合,双单端电路和半桥电路被广泛地应用。然而,由于功率管有较高的开关频率,开关电源开通和关断过程产生的瞬变电压/电流含有较为丰富的高次谐波成分,这些谐波容易经过传导和辐射污染周围电磁环境,对其他通信设备和电子产品造成干扰。因此,通信开关电源需采取必要措施减小其电磁干扰发射的能力,使其符合EMC发射标准的规定。本课题主要针对一种结构较为少见的半隔离式DC/DC开关电源的传导EMI问题进行研究。在该电路拓扑中,部分电能从输入侧直接传递到输出,另一部分电能则通过变压器耦合到输出侧。本文从该电路DC/DC工作过程出发,在分析其差、共模干扰传播特性的基础上,建立其传导电磁干扰的模型,并研究在此拓扑中出现的传导干扰新特性,进而提出相应的改进和抑制措施。为了研究该半隔离拓扑开关电源的电磁干扰机理,文本具体介绍了这台额定输入-48V,输出为-57V,工作在开关频率110k Hz的半隔离功率变换器。隔... 

【文章来源】：哈尔滨工业大学黑龙江省 211工程院校 985工程院校

【文章页数】：72 页

【学位级别】：硕士

【文章目录】：
摘要
Abstract
Chapter 1 Introduction
    1.1 Objectives and Significance of Research
    1.2 Research Status on Conducted EMI in SMPS
    1.3 Main Research Contents of Subject
Chapter 2 Design of Semi-isolated DC/DC Power Supply
    2.1 Introduction of Chapter
    2.2 Topology and Operating Principle of Semi-isolated SMPS
    2.3 Parameters Design of Main Circuit
        2.3.1 Designing of Capacitor in Output Filter
        2.3.2 Design of Inductor in Output Filter
        2.3.3 Design of Transformer
    2.4 Design of Control Circuit
    2.5 Functional Simulation and Measurement Result
    2.6 Summary of Chapter
Chapter 3 High Frequency Conducted EMI Simulation Model
    3.1 Introduction of Chapter
    3.2 Circuit Model of Passive Components
        3.2.1 Inductors in High Frequency
        3.2.2 Electrolytic Capacitor in High Frequency
    3.3 Circuit Model of Active Components
        3.3.1 Model of MOSFET in High Frequency
        3.3.2 Model of Rectify Diode in High Frequency
    3.4 Model of Transformer in High Frequency
    3.5 Parasite Parameters Extraction of PCB
    3.6 Summary of Chapter
Chapter 4 EMI Pathway Model Analysis
    4.1 Introduction of Chapter
    4.2 Common Mode Noise and Differential Mode Noise
    4.3 Equivalent Source of EMI Noise
    4.4 Analysis on the Noise Source Functions
        4.4.1 Only Voltage Sources Function
        4.4.2 Only Current Sources Function
    4.5 EMI Path Model in Semi-isolated SMPS
        4.5.1 CM Path Model of Semi-isolated SMPS
        4.5.2 DM Path Model of Semi-isolated SMPS
    4.6 Summary of Chapter
Chapter 5 Conducted Interference Suppression
    5.1 Introduction of Chapter
    5.2 Design of Traditional EMI Filter
    5.3 New Type of EMI Filter Design
    5.4 Summary of Chapter
Conclusions
References
Acknowledgement


【参考文献】：
期刊论文
[1]超前-滞后网络在变频电源中的应用[J]. 张鹏超.  电气应用. 2010(23)
[2]开关电源高频变压器电容效应建模与分析[J]. 董纪清,陈为,卢增艺.  中国电机工程学报. 2007(31)
[3]用于传导EMI仿真的二极管高频模型的研究[J]. 袁义生,谌平平,穆斯塔法,钱照明.  电力电子技术. 2001(06)



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