Cours Electronique de puissance 2

Electronique de puissance
DC‐ACConverter
Inverters

Introduction
Introduction
•ConversionofaDCsourceintoanACoutputwithavariablefrequency.
•ThefrequencyoftheoutputACcanbecontrolledbytheconduction
period of po er sitchesof the in erter
period
of
po
w
er
s
w
itches
of
the
in
v
erter
.
•Out
p
utvolta
g
eofinverterhasanosinusoidal
p
eriodicwaveformbutcan
p g p
bemadetocloselyapproximatethisdesiredwaveform.
f
•Invertersareusedinindustrialapplications,includingspeedcontrolo
f
inductionandsynchronousmotor,aircraftpowersupplies,uninterruptible
powersupplies(UPS),andhigh‐voltageDCtransmision.

Half-Bridge Inverter

Square‐waveoutput
Step
wave output
Step
‐
wave
output

Half‐BridgeVSI(Voltage Source Inverter)