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CTR=0
CTR=CMPB
X
EN
SyncOut
Phase reg
Ext SyncIn
(optional)
EPWM1A
EPWM1B
SyncOut
Phase reg
CTR=CMPB
CTR=0
X
EN
EPWM2B
EPWM2A
Slave
Master
SyncIn
SyncIn
1
2
Φ=0°
Φ=0°
3.3ControllingMultipleBuckConvertersWithIndependentFrequencies
ControllingMultipleBuckConvertersWithIndependentFrequencies
Figure3-2.EPWM1ConfiguredasaTypicalMaster,EPWM2ConfiguredasaSlave
Oneofthesimplestpowerconvertertopologiesisthebuck.AsingleePWMmoduleconfiguredasa
mastercancontroltwobuckstageswiththesamePWMfrequency.Ifindependentfrequencycontrolis
requiredforeachbuckconverter,thenoneePWMmodulemustbeallocatedforeachconverterstage.
Figure3-3showsfourbuckstages,eachrunningatindependentfrequencies.Inthiscase,allfourePWM
modulesareconfiguredasMastersandnosynchronizationisused.Figure3-4showsthewaveforms
generatedbythesetupshowninFigure3-3;notethatonlythreewaveformsareshown,althoughthere
arefourstages.
SPRU791D–November2004–RevisedOctober2007ApplicationstoPowerTopologies71
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