由于開關(guān)電源具有效率高、功率密度高、體積小、重量輕等優(yōu)點(diǎn),因此被廣泛地應(yīng)用于程控交換、光數(shù)據(jù)傳輸、無線基站、有線電視系統(tǒng)及IP網(wǎng)絡(luò)中。當(dāng)今通信開關(guān)電源多采用單端雙端電路、半橋電路和全橋電路等拓?fù)?在中小功率場合,雙單端電路和半橋電路被廣泛地應(yīng)用。然而,由于功率管有較高的開關(guān)頻率,開關(guān)電源開通和關(guān)斷過程產(chǎn)生的瞬變電壓/電流含有較為豐富的高次諧波成分,這些諧波容易經(jīng)過傳導(dǎo)和輻射污染周圍電磁環(huán)境,對其他通信設(shè)備和電子產(chǎn)品造成干擾。因此,通信開關(guān)電源需采取必要措施減小其電磁干擾發(fā)射的能力,使其符合EMC發(fā)射標(biāo)準(zhǔn)的規(guī)定。本課題主要針對一種結(jié)構(gòu)較為少見的半隔離式DC/DC開關(guān)電源的傳導(dǎo)EMI問題進(jìn)行研究。在該電路拓?fù)渲?部分電能從輸入側(cè)直接傳遞到輸出,另一部分電能則通過變壓器耦合到輸出側(cè)。本文從該電路DC/DC工作過程出發(fā),在分析其差、共模干擾傳播特性的基礎(chǔ)上,建立其傳導(dǎo)電磁干擾的模型,并研究在此拓?fù)渲谐霈F(xiàn)的傳導(dǎo)干擾新特性,進(jìn)而提出相應(yīng)的改進(jìn)和抑制措施。為了研究該半隔離拓?fù)溟_關(guān)電源的電磁干擾機(jī)理,文本具體介紹了這臺額定輸入-48V,輸出為-57V,工作在開關(guān)頻率110k Hz的半隔離功率變換器。隔... 

【文章來源】：哈爾濱工業(yè)大學(xué)黑龍江省 211工程院校 985工程院校

【文章頁數(shù)】：72 頁

【學(xué)位級別】：碩士

【文章目錄】：
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


【參考文獻(xiàn)】：
期刊論文
[1]超前-滯后網(wǎng)絡(luò)在變頻電源中的應(yīng)用[J]. 張鵬超.  電氣應(yīng)用. 2010(23)
[2]開關(guān)電源高頻變壓器電容效應(yīng)建模與分析[J]. 董紀(jì)清,陳為,盧增藝.  中國電機(jī)工程學(xué)報(bào). 2007(31)
[3]用于傳導(dǎo)EMI仿真的二極管高頻模型的研究[J]. 袁義生,諶平平,穆斯塔法,錢照明.  電力電子技術(shù). 2001(06)



本文編號：3465520