《上海交大电力电子技术ch1 introduction》由会员分享，可在线阅读，更多相关《上海交大电力电子技术ch1 introduction（18页珍藏版）》请在金锄头文库上搜索。
1、,Power ElectronicsShanghai JiaoTong University E.E Department Wang YongContact: Mobile: 15800793762,Copyright partly from John Wiley & Sons,Inc,About This Course,Three Parts of this course:Power electronic devicesPower electronic circuits Ch2-Ch8Applications 2 times lecture,Reference Books:,1. Powe
2、r Electronics: Converters, Application, And Design (Third Edition), Ned Mohan 电力电子学变换器、应用和设计， 高等教育出版社,3. 电力电子技术基础金如麟，谭茀娃编著，上海交通大学出版社,Required Book:,2. 电力电子技术（第五版），西安交通大学 王兆安、刘进军主编，机械工业出版社,experiment 20%homework 20%final test 60%,The criteria for the scoring,Introduction,1-1 Introduction 1-2 Power el
3、ectronics versus linear electronics 1-3 Scope and applications 1-4 Classification of power processors and converters 1-5 About the text 1-6 Interdisciplinary nature of power electronics,Power electronics refers to control and conversion of electrical power by power semiconductor devices wherein thes
4、e devices operate as switches.,A typical power electronic system,2 questions: What to do? How to do?,What is power electronics,A concrete example,Linear Power Supply,Control,so that we have,e.g.,Series transistor acts as an adjustable resistor Low Efficiency Heavy and bulky (for line transformer),VT
5、,Switch-Mode Power Supply,Basic Principle of Switch-Mode Power Supply,Constant switching frequencyPulse width controls the outputL-C filters the ripple,Transistor acts as a switch High Efficiency for ideal switch when turn on u=0 when turn off i=0 ploss=ui 0 High-Frequency Transformer (much smaller
6、and lighter) More EMI (electro-magnetic interference) (much more harmonic),Voltage-second balance,About the efficiency, here efficiency defined with,high efficiency lower Ploss less heat dissipated small cooling system higher reliabilityhigher power density small size and less weight, low temperatur
7、e rise and higher reliabilitylower cost,Applications,AC-DC Conversion (Rectifier)Regulated DC power supplies High voltage DC transmission,DC-DC Conversion DC power supply,Battery chargers,Variable speed dc motor drives,DC drive,DC-AC Conversion (Inverter)Emergency lighting systems Variable-frequency
8、 ac motor drives Uninterrupted power supplies (UPS) Aircraft and space power supplies,AC-AC Conversion Cyclo-converter: the output frequency is a simple fraction of the source frequency Matrix converter,Classification of power converters,The main tasks of power electronics is to control and converte
9、lectrical power from one form to another.,Example: A laptop computer power supply system,Matrix converter,The design work of the system must consider the issues below Control Efficiency Cost Reliability Harmonics,Relation with multiple disciplines Power electronics is the interface between electronics and power. It concerns many disciplines. It is the most active discipline in electric power engineering.,Interdisciplinary nature of PE,
