
DC–AC Converters 14-31
e conventional CHB assumes that all the dc voltage sources V
dci
have exactly the same values,
this corresponds to the CHB with equal dc sources of the classication in Figure 14.27. Assuming this
conventional dc voltage ratio and considering a two-cell cascaded converter, like the one shown in
Figure 14.31, the possible switching states are listed in Table 14.6. e two-cell achieves ve possible
output voltages and, therefore it is a ve-level converter. Many of the switching states generate the same
+
a
O
+
v
c2
v
c1
LV-IGBT
V
dc1
S
a1
S
a1
S
a3
S
a3
V
dc2
S
a4
S
a4
S
a2
S
a2
v
ao
FIGURE 14.31 Two-cell CHB converter.
TABLE 14.6 Five-Level CHB Sw ...