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Three-Phase Inverters
Consider three single-phase inverters in parallel, driven 120° apart.
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Three-Phase Inverter (continued)Three single-phase full bridge inverters
12 transistors, 12 diodes, 3 transformers
Could it be simpler?
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Alternative (Preferred) Configuration
6 transistors, 6 diodes conduction for 120° or 180°
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180° Conduction
• Three transistors ON at a time
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Summary Table
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Waveforms for 180 Conduction
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Phase Voltages for 180 Conduction
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Waveforms for 180 Conduction
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Summary Table
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Mode 1 Operation
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Mode 1 Operation
1
1
1
32 223
2 323
eq
s s
eq
san cn
sbn
R RR R
V ViR R
Vi Rv v
Vv i R
03
t
Q1, Q5, Q6 conduct
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Summary Table
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Mode 2 Operation
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Mode 2 Operation
2
2
2
32 223
23
2 3
eq
s s
eq
san
sbn cn
R RR R
V Vi
R R
Vv i R
Vi Rv v
23 3
t
Q1, Q2, Q6 conduct
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Summary Table
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Mode 3 Operation
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Mode 3 Operation
23
t
3
3
3
32 223
223
eq
s s
eq
an bn
scn
R RR R
V ViR R
iv v
Vv i R
Q1, Q2, Q3 conduct
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Phase Voltages for 180 Conduction
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Fourier Series for Line-to-Line Voltages
1
5 56 6
56 6
1,3,5,...
( cos( ) sin( ))2
1 ( ) ( )
4 sin( )sin( )2 34 sin sin ( )
3 6
oab n n
n
n s s
sn
sab
n
av a n t b n t
b V d t V d t
V n nbn
V nv n tn
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For the other Line-to-Line Voltages
1,3,5,...
1,3,5,...
4 sin sin ( )3 2
4 7sin sin ( )3 6
sbc
n
sca
n
V nv n tnV nv n tn
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Line-to-Line rms Voltage
12 23
2
0
2 ( )2
2 0.81653
L s
L s s
V V d t
V V V
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rms value of the nth Component
1
4 sin32
14 sin 60 0.7797
2
sLn
sL s
V nVn
nVV V
Fundamental Component
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Line-to-Neutral Voltages
2 0.471433
sLp s
VVV V
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Phase Voltages (Y-connected load)
1,3,5,..
1,3,5,..
1,3,5,..
4 sin( )sin( )33
4 2sin( )sin ( )3 33
4 4sin( )sin ( )3 33
saN
n
sbN
n
scN
n
V nv n tnV nv n tnV nv n tn
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Line Current for an RL load
2 21,3,5,...
1
4 sin sin( )33 ( )
tan
sa n
n
n
V ni n tn R n L
n LR
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DC Supply Current
IL=√3Io is the rms load line current
Vo1= fundamental rms output line voltage
Io is the rms load phase current
Θ1 = the load impedance angle at the fundamental frequency
11
11
( ) ( ) ( ) ( ) ( ) ( )....
3 cos( )
3 cos( )
s s ab a bc b ca c
os o
s
os L
s
v i v t i t v t i t v t i t
VI IVVI IV
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Three-Phase Inverter with RL Load