rquevalueshavewindingswithsmallerresistances.Therefore,theyrequireacontrolledcurrentsupply.TheLprovidesloadcurrentcontrolintheformoftwoPulseWidthModulation(PWM)choppercircuitsandeachchoppercircuitconsistsofacomparator,aflip-flopandanexternalsensingresistor.Inthismethod,whilethemotorcurrentisincreasing,thecontrolsystemappliesthesupplyvoltagetothemotor.Whenthecurrentisreacheduptothethreshold,thecontrolsystemtriestomaintainthecurrentatthedesiredvaluebychangingthedutyratioofthevoltagesupplyasshowninFig...Foreachchoppercircuit,thedutyratio(D)ofthevoltagesupplytothemotorisdefinedas:D=Ton/(Ton+Toff),wheretheTonandToffareswitchonandoffdurationsrespectivelyoftheHbridge.Inthechoppercircuit,theflip-flopissetbyeachpulsefromtheoscillator,enablingtheoutputandallowingtheloadcurrenttoincrease.Asitincreasesthevoltageacrossthesensingresistorincrea与接低操作接口设计用以产生LN需要输入信号逻辑电路和微控制器控制信号在驱动电路中扮演着主要角色。
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