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3.5ControllingMultipleHalfH-Bridge(HHB)Converters
CTR=zero
CTR=CMPB
X
En
SyncOut
Phase reg
Ext SyncIn
(optional)
EPWM1A
EPWM1B
SyncOut
Phase reg
CTR=CMPB
CTR=zero
X
En
EPWM2B
EPWM2A
Slave
Master
V
out1
EPWM1A
SyncIn
SyncIn
V
DC_bus
EPWM1B
EPWM2B
EPWM2A
V
DC_bus
V
out2
Φ=0°
Φ=0°
ControllingMultipleHalfH-Bridge(HHB)Converters
Topologiesthatrequirecontrolofmultipleswitchingelementscanalsobeaddressedwiththesesame
ePWMmodules.ItispossibletocontrolaHalf-HbridgestagewithasingleePWMmodule.Thiscontrol
canbeextendedtomultiplestages.Figure3-7showscontroloftwosynchronizedHalf-Hbridgestages
wherestage2canoperateatintegermultiple(N)frequenciesofstage1.Figure3-8showsthewaveforms
generatedbytheconfigurationshowninFigure3-7.
Module2(slave)isconfiguredforSyncflow-through;ifrequired,thisconfigurationallowsforathirdHalf-H
bridgetobecontrolledbyPWMmodule3andalso,mostimportantly,toremaininsynchronizationwith
mastermodule1.
Figure3-7.ControlofTwoHalf-HBridgeStages(F
PWM2
=NxF
PWM1
)
78ApplicationstoPowerTopologiesSPRU791D–November2004–RevisedOctober2007
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