Topic 2Main contentsLast lecture reviewReality of Inductor and CapacitorDiodeSCRMOSFETIGBT
Main contents • Last lecture review • Reality of Inductor and Capacitor • Diode • SCR • MOSFET • IGBT Topic 2
1.What is Power ElectronicsDefinition ofPower ElectronicsEmeritusProfessoratDuke University,PELS formerchairman Thomas G. Wilson-Powerelectronics is the technologyassociated withthe efficient conversion(3)control and conditioning(4)of electric powerby static means(5)from its available input(1)form into the desired electrical output(2)form
Definition of Power Electronics Emeritus Professor at Duke University, PELS former chairman Thomas G. Wilson —— Power electronics is the technology associated with the efficient conversion(3) , control and conditioning(4) of electric power by static means(5) from its available input(1) form into the desired electrical output(2) form. 1. What is Power Electronics
Blockdiagramofapowerelectronics systemPoweroutput-33Powerinput电源输出黑LoadPowerprocessorReferenceControllerFeedback
Block diagram of a power electronics system Power input Power output Load Power processor Reference Controller Feedback
Inclusionsforpowerelectronics:1)WithStaticmeans-semiconductordevices2)Processingpowerconversionhighefficiently3)Bycontrol orlandconditioning4)Obtaining desired output5)From availableinputFor above mentioned conducting smoothly, there are sometechniques to be settled, such as ---Gate/basedriversLossesSnubbers
Inclusions for power electronics: 1) With Static means - semiconductor devices 2) Processing power conversion high efficiently 3) By control or/and conditioning 4) Obtaining desired output 5) From available input For above mentioned conducting smoothly, there are some techniques to be settled, such as - Gate/base drivers Losses Snubbers
2. Roles of Power ElectronicsApplications of powerelectronics are everywhereanywhere and wherever electricity pervades!Classification of applicationsa. Motor driveb.Power supplyc. Power qualityd.Power systems
Applications of power electronics are everywhere, anywhere and wherever electricity pervades! Classification of applications - a. Motor drive b. Power supply c. Power quality d. Power systems 2. Roles of Power Electronics
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3ClassificationofPowerProcessorsandConverters3.1PowerProcessorsThe power processor usually consist of more than onepower conversion stage(converter变换器、变流器）.Mostpractical topologies require an energy storage elementwhich also decouples the input and the output sideconverters.PowerprocessorInputOutputConverter1EnergyConverter2storageelementFigure 1-6 Power processor block diagramE-mail:xjh
E-mail: xjh 8 uang@bjtu.edu.cn 3 Classification of Power Processors and Converters 3.1 Power Processors The power processor usually consist of more than one power conversion stage (converter变换器、变流器). Most practical topologies require an energy storage element, which also decouples the input and the output side converters
Example: AC Motor DrivePowerprocessoracacacConverter2Converter1dcmotorUtilityFigure 1-8 Block diagram of an ac motor drive..Converter 1rectifies line-frequency ac into do: Capacitor acts as a filter; stores energy; decouples: Converter 2 synthesizes adjustable -frequency ac to motor
Example：AC Motor Drive • Converter 1 rectifies line-frequency ac into dc • Capacitor acts as a filter; stores energy; decouples • Converter 2 synthesizes adjustable -frequency ac to motor
In most power processors, the input is from theelectric utility source. The output may have anyof the following forms:1. DC(a)Regulated(constant)magnitude，如开关电源(b)Adjustable magnitude，如直流调速器2.AC(a)Constantfrequency,adjustablemagnitude，如交流电源(b)Adjustable frequency and adjustable magnitude，如交流调速器（变频器、伺服控制器）
1. DC (a) Regulated (constant) magnitude，如开关电源 (b) Adjustable magnitude，如直流调速器 2. AC (a) Constant frequency, adjustable magnitude，如交流电源 (b)Adjustable frequency and adjustable magnitude，如交流 调速器（变频器、伺服控制器） In most power processors, the input is from the electric utility source. The output may have any of the following forms:
3.2 Power converters ★V According to average power flow direction, converters canbe divide into the follow categories:ElectricPowerPowerinputConverterPowerControl(1)Ac to dc----rectify,rectifier （整流器）inputoutput(2) Dc to dc----chop, chopper (斩波器)(3) Dc to ac----invert, inverter （逆变器）(4)Ac to ac----Fixed frequency :AC controller (交流电力控制器）Variable frequency:Cycloconverter（周波变换器）orac-ac frequency converter（交一交变频器）
(1) Ac to dc-rectify, rectifier（整流器） (2) Dc to dc-chop, chopper（斩波器） (3) Dc to ac-invert, inverter（逆变器） (4)Ac to ac-Fixed frequency :AC controller（交流电 力控制器） Variable frequency: Cycloconverter（周波变换器） or ac-ac frequency converter（交—交变频器） ✓According to average power flow direction, converters can be divide into the follow categories: Power output Electric Power Converter Power input Control input 3.2 Power converters ☆