1、 is the electronics applied to conversion and control of electric power.milliwatts(mW)megawatts(MW)gigawatts(GW)The primary task of power electronics 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 conv
2、erter -Converter -Switching converter -Power electronic circuit -Power electronic converterElectric PowerConverterACAC to DC converter (Rectifier)AC to AC converter(Fixed frequency:AC controller Variable frequency:Cycloconverter or frequency converter)DCDC to DC converter(Chopper)DC to AC converter(
3、Inverter)Power outputPower inputPower ConverterPower outputPower inputControllerFeedforward/FeedbackFeedback/FeedforwardReference(commanding)(measurements of input signals)Control is invariably required.Power converter along with its controller including the corresponding measurement and interface c
4、ircuits,is also called power electronic system.Control inputThe task of power electronics has been recently 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 e
5、lectric or electronic equipment-Electric utility-battery-other electric energy source-power converterViiiioVoElectronicsDevices,circuitsPowerStatic&rotating power equipmentPowerElectronics ControlThyristortIt is estimated that in developed countries now 60%of the electric energy goes through some ki
6、nd of power electronics 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 supplies and better control of electric equipment -energy saving -environment protection
