《电力电子技术》课程教学课件（PPT讲稿）Topic 01 Power Electronics

Topic 1Main contentsDefinition of Power ElectronicsBasic devices/components of PE systemsApplication and the Role of PEClassification of Power Processor and ConvertersAbout the Text and the Course

Main contents • Definition of Power Electronics • Basic devices/components of PE systems • Application and the Role of PE • Classification of Power Processor and Converters • About the Text and the Course Topic 1

1.WhatisPowerElectronicsDefinition 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

1.Whatis Power ElectronicsWhy need conversion?DesiredoutputAvailableinputIAc factors:amplitude,frequency,phase, distortionACVoltageDCfactors:Timeamplitude,rippleTimeIdealizedWaveformDC

Desired output DC AC Idealized Waveform Time Why need conversion？ Available input AC factors： amplitude , frequency, phase, distortion DC factors: amplitude,ripple 1. What is Power Electronics

1.Whatis Power ElectronicsWhy need conversion?(2)Desiredoutput(1)AvailableinputDCfactors:DCDCamplitude,rippleInputOutputACACACfactors:amplitude,frequency,phase, distortion

1. What is Power Electronics Why need conversion？ (1)Available input (2)Desired output Input Output DC factors: amplitude,ripple AC factors： amplitude , frequency, phase, distortion

1.Whatis Power Electronics(3)EfficientconversionConverter

(3)Efficient conversion 1. What is Power Electronics

1.WhatisPowerElectronics(3)EfficientconversionAnexampleHowto realizeconvertingfrom100Vpcto5oVoc?10AVDc-deRVconverter50V52100VInputsource:10ovOutputload:50V,10A,500wHowcanthisconverterberealized?

(3)Efficient conversion An example. How to realize converting from 100VDC to 50VDC? 1. What is Power Electronics

1.WhatisPowerElectronics(3)EfficientconversionAn example.Howto realizeconvertingfrom100Vpcto5oVoc?Resistivevoltagedivider110AK+Cannot be!+50VVPloss=500WRVK50V592100VWhy?ou=500WPn=1000WD

(3)Efficient conversion An example. How to realize converting from 100VDC to 50VDC? Cannot be ! Why? 1. What is Power Electronics

1.WhatisPowerElectronicsAn example.(3)EfficientconversionHowto realizeconvertingfrom100Vpcto5oVoc?Seriespass regulator:transistor operatesinactive region1Cannot be!10A50V++linearamplifierVeWhy?RVandbasedrive50V52100V-500WDP.1000w=500W

(3)Efficient conversion An example. How to realize converting from 100VDC to 50VDC? Cannot be ! Why? 1. What is Power Electronics

1.Whatis Power ElectronicsAnexample(3)Efficientconversion10A+Hard to utilize!2Rv(t)v,(t)50V100VWhy?V(0)VeHow to realize convertingV.=DV0from100Vpcto50Vpc?DT,+(-D)Ttswitch2position:11

An example. Cannot be ! Why? Hard to utilize ! Why? How to realize converting from 100VDC to 50VDC? (3)Efficient conversion 1. What is Power Electronics

1.Whatis Power Electronics(3)EfficientconversionVD=switchdutycycleV.=DV0≤D≤10T=switchingperiodDT,(1-D)TISwitchf,=switchingfrequencyposition:211=1/T,How to realizeDCcomponentofy(t)=averagevalue:physically?y()dt=DV

(3)Efficient conversion How to realize physically? 1. What is Power Electronics