An αSangle controller,SwhichSadapt to theSvariation of power frequency,Sis applied to theSthyristor three-phase fullScontrolled bridge rectifier,Sa single-chip microprocessorSchip as the core,Sthrough the softwareSprocessing,Stracking theSvariation of power frequency, finally,Sthe controllerSgenerates 6Sphase triggerSpulse,StheSpulseSmode is doubleSpulse and pulseSmodulation.SThis articleSshows the basicShardware structure of the system,Semphatically introduces the processingSmethods to deal with theSvariation of power frequency,Sanalysis of theSupper and lowerSerror,Sthe frequency of the power supply,StheSoutputSresults are given,StheSresults are in several ACSsideSrectifier bridgeSpower supplySunder the condition ofSdifferentSfrequency.SThe systemSis embeddedSmicroprocessorSis the key,Scontroller not onlySin conventionalSpower conditionsScanSexert excellentSperformanceSand its accuracy,Sreliability,Sflexibility,SandSnon standard frequency,Swithin a certain range of theSfrequencySchange of circumstancesScan real-timeStrackingSpowerScycle,Sautomatic correction ofSangle error,Sensure the correctnessSof the bridge rectifierStrigger.SIts meaning is reflectedSin the nonSgridSenvironment,Ssuch as outstandingSgridSdiesel generator,Swind power,Ssolar power, mechanical energy storageStype powerSetc.,SinSthese isolatedSACSpower supply,Sthe controller can guarantee theSthyristorSthree-phase fullScontrolled bridge rectifierScan be normalSandSreliable work.