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Mode 2
:
In
this mode the switches
S
6
,
S
1
and
S
2
are
turned
on
for
time interval
. The
current flow and the equivalent
circuits are shown in
Figure
and
Figure
respectively. Following the
reasoning given for
mode 1
, the currents through each branch and the
voltage drops are given by
(6)
(7)
Figure: 5.19 Mode 2 operation of three phase bridge inverter with star connected load
Figure: 5.20 Current flow in Mode 2 operation
161 |
P a g e
Mode 3
:
In this mode the switches
S
1
,
S
2
and
S
3
are
on
for
.
The current flow and the
equivalent circuits are shown in
Figure
and
figure
respectively. The magnitudes of currents and voltages
are:
(8)
(9)
Figure: 5.21 Mode 3 operation of three phase bridge inverter with star connected load
Figure: 5.23 Current flow in Mode 3 operation
162 |
P a g e
For
modes 4, 5
and
6
the equivalent circuits will be same as
modes 1, 2
and
3
respectively. The voltages
and currents for each mode are:
for
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