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1、TextBDC-DCconverterapplication电源转换器的应用程序DCMotorDrive直流电机驱动Beforethewidespreadapplicationofpower-electronicdrivestocontrolACmachines,DCmotorswerebyfarthemachinesofchoiceinapplicationsrequiringflexibilityofcontrol.AlthoughinrecentACdriveshavebecomequitecommon,theeaseofcontr
2、olofDCmachinesinsurestheircontinueduseinmanyapplications.在电力电子驱动控制交流电机得到广泛应用之前,直流电机是目前要求机器应用程序控制灵活的（普遍）选择。尽管最近AC驱动器已经变得普遍,但易于控制的直流机确保它们能继续在许多应用程序中使用。BasedoncharacteristicsofDCmotor,apowerelectronicconvertersupplyingaDCshouldhavethecapabilities:基于直流电机的特点,电力电子变换器提供一个直流（电机）应
3、具备的动力:(1),TheconvertershouldmakeitsoutputvoltageandcurrenttoreverseinordertoyieldaFour-quadrantoperation.(1),变频器应使其输出电压和电流反向,以用来能在四个象限来运行。(2),Theconvertershouldbeabletooperateinacurrent-controlledmodebyholdingthecurrentatitsmaximumacceptablevalueduringfastaccelerationandd
4、eceleration.Thedynamiccurrentlimitisgenerallyseveraltimeshigherthanthecontinuoussteady-statecurrentratingofthemotor.(2)转换器应该在其最大可接受的值快速加速和减速，以确保在当前能够运行在电流控制模式。动态电流限制通常是高于连续稳态电动机的额定电流几倍（数值）。(3),Foraccuratecontrolofposition,theaveragevoltageoutputoftheconvertershouldvarylin
5、earlywithitscontrolinput,independentoftheloadonthemotor.(3),为了能进行位置的精确控制,平均电压转换器线性控制的输出应该与其控制的输入成线性关系,且独立于电机上的负载。(4),TheconvertershouldproduceanarmaturecurrentwithagoodformfactorandshouldMinimizethefluctuationsintorqueandspeedofthemotor.(4)转换器应该用一个很好的形式因素产生一个电枢电流和减小电机的转矩和
6、速度的波动。(5),Theconverteroutputshouldrespondasquicklyaspossibletoitscontrol,thusallowingtheconvertertoberepresentedessentiallybyaconstantgainwithoutadeadtimeintheoverallservodrivetransferfunctionmodel.(5)转换器输出应该尽可能快回应它的控制,从而使转换器基本上在整个伺服驱动传递函数模型中有固定时间的恒定增益Switch-modeDC-DCconv
7、ertersmaysatisfyalltherequirementslistedabove.Afull-bridgeswitch-modeDC-DCconverterproducesafour-quadrantcontrollableDCoutputTheoverallsystemisshowninFig.3.11,wheretheline-frequencyACinputrectifiedintoDCbymeansofadioderectifierofthetypeandfilteredbymeansoffiltercapacitor.
8、Anenergydissipationcircuitisincludedtopreventthefilercapacitorvoltagefrombecominglargeincaseofbr
