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1、Power Electronics,Chapter 1Introduction,Power ElectronicsChapter 1,Outline,What is power electronics?The historyApplicationsA simple exampleAbout this course,OutlineWhat is power electroni,What is power electronics?,DefinitionRelation with information electronicsThe interdisciplinary naturePosition
2、and significance in the human society,What is power electronics?Defi,Power Electronics: A more exact explanation:,is the electronics applied to conversion and control of electric power. Range of power scale : milliwatts(mW) megawatts(MW) gigawatts(GW),Definition,The primary task of power electronics
3、 is to process and control the flow of electric energy by supplying voltages and currents in a form that is optimally suited for user loads.,Power Electronics: is,Conversion of electric power,Other names for electric power converter: -Power converter -Converter -Switching converter -Power electronic
4、 circuit -Power electronic converter,Frequency, magnitude, number of phases,AC (Alternating Current),Magnitude,DC(Direct Current),Changeable properties in conversion,Two types of electric power,Conversion of electric powerOt,Classification of power converters,Power output,Power input,Classification
5、of power conver,Power electronic system,Generic structure of a power electronic system,Power Converter,Power output,Power input,Controller,Feedforward/Feedback,Feedback/Feedforward,Reference(commanding),( measurements of output signals ),( measurements of input signals ),Control is invariably requir
6、ed. Power converter along with its controller including the corresponding measurement and interface circuits, is also called power electronic system.,Control input,Power electronic systemGeneric,Typical power sources and loads for a power electronic system,The task of power electronics has been rece
7、ntly extended to also ensuring the currents and power consumed by power converters and loads to meet the requirement of electric energy sources.,-Electric Motor-light-heating-power converter -other electric or electronic equipment,Power Converter,Source,Power input,Power output,Load,Controller,Refer
8、ence,-Electric utility-battery-other electric energy source -power converter,Feedback/Feed forward,Typical power sources and load,A Classification of electronics by processing object,Relation with information electronics,Other classifications of electronics,A Classification of electronic,The interdi
9、sciplinary nature,William E. Newells description,Power electronics is the interface between electronics and power.,The interdisciplinary natureWi,Relation with multiple disciplines,Power electronics is currently the most active discipline in electric power engineering worldwide.,Relation with multip
10、le discipl,Position and significance in the human society,Electric power is used in almost every aspect and everywhere of modern human society.Electric power is the major form of energy source used in modern human society.The objective of power electronics is exactly about how to use electric power,
11、 and how to use it effectively and efficiently, and how to improve the quality and utilization of electric power.Power electronics and information electronics make two poles of modern technology and human society information electronics is the brain,and power electronics is the muscle.,Position and
12、significance in,The history,The thread of the power electronics history precisely follows and matches the break-through and evolution of power electronic devices,late 1980s,mid 1970s,1957,1900,Mercury arc rectifier Vacuum-tube rectifier Thyratron,Invention of Thyristor,Power diode Thyristor,Applicat
13、ion of fast-switching fully-controlled semiconductor devices,GTOGTRPower MOSFET Thyristor(microprocessor),IGBTPower MOSFETThyristor(DSP),Pre-history,1st phase,2nd phase,3rd phase,The historyThe thread of the p,Applications,IndustrialTransportationUtility systemsPower supplies for all kinds of electr
14、onic equipmentResidential and home appliancesSpace technologyOther applications,ApplicationsIndustrial,Industrial applications,Motor drivesElectrolysisElectroplatingInduction heatingWeldingArc furnaces and ovensLighting,Industrial applicationsMotor d,Transportation applications,Trains & locomotivesS
15、ubwaysTrolley busesMagnetic levitationElectric vehiclesAutomotive electronicsShip power systemsAircraft power systems,Transportation applicationsTra,Utility systems applications,High-voltage dc transmission(HVDC)Flexible ac transmission(FACTS)Static var compensation & harmonics suppression: TCR, TSC
16、, SVG, APFCustom power & power quality controlSupplemental energy sources : wind, photovoltaic, fuel cellsEnergy storage systems,Utility systems applicationsHi,Power supplies for electronic equipment,TelecommunicationsComputersOffice equipmentElectronic instrumentsPortable or mobile electronics,serv
17、er,computer,Telecommunication,Power supplies for electronic,Residential and home appliances,LightingHeatingAir conditioningRefrigeration & freezersCookingCleaningEntertaining,Residential and home appliance,Applications in space technology,Spaceship power systemsSatellite power systemsSpace vehicle p
18、ower systems,Applications in space technolo,Other applications,Nuclear reactor controlPower systems for particle acceleratorsEnvironmental engineering,Other applicationsNuclear reac,Trends,It is estimated that in developed countries now 60% of the electric energy goes through some kind of power elec
19、tronics converters before it is finally used.,reduction of energy consumption leads to less pollution reduction of pollution produced by power converters direct applications to environment protection technology,Power electronics has been making major contributions to: -better performance of power su
20、pplies and better control of electric equipment -energy saving -environment protection,TrendsIt is estimated that in,A simple example,A simple dc-dc converter example,Input source:100VOutput load:50V, 10A, 500WHow can this converter be realized?,A simple example A simple dc-d,Dissipative realization
21、,Resistive voltage divider,Dissipative realizationResisti,Dissipative realization,Series pass regulator: transistor operates in active region,Dissipative realizationSeries,Use of a SPDT switch,SPDT: Single pole double throw,Use of a SPDT switchSPDT: Sing,The switch changes the dc voltage level,The s
22、witch changes the dc volt,Addition of low pass filter,Addition of (ideally lossless) L-C low-pass filter, for removal of switching harmonics:,Choose filter cutoff frequency f0 much smaller than switching frequency fs This circuit is known as the “buck converter”,Addition of low pass filterAdd,Additi
23、on of control system for regulation of output voltage,Addition of control system for,Major issues in power electronics,How to meet the requirement of the load or gain better control of the loadHow to improve the efficiency -for reliable operation of power semiconductor devices -for energy savingHow
24、to realize power conversion with less volume, less weight, and less costHow to reduce negative influence to other equipment in the electric power system and to the electromagnetic environment,Major issues in power electron,About this course,Relation with other courses,Four parts of the contentPower
25、electronic devices: Chapter 2 and 9Power electronic circuits: Chapter 3, 4, 5 and 6Control techniques: Chapter 7 and 8Applications: Chapter 10,About this courseRelation with,Arrangement,Text books - 王兆安，刘进军。电力电子技术。北京：机械工业出版社，2009 - N. Mohan, T. M. Undeland, W. P. Robbins. Power edectronics: converter, applications, and Design, 3rd edition, John Wiley & Sons, New York, 2003, Higher Education Press, Beijing, China, 2004Lectures - 48 hours , all in English - After-class reading in Chinese and English will be assigned.Labs - 8 hours, 5 projects,ArrangementText books,
