
19-16 Power Electronics and Motor Drives
e status of dierent switches for realizing these voltage levels is
tabulated in Table 19.2. Note that, the switches in each leg of the
constituent inverters are operated complementary to each other to
prevent short circuit of the dc bus.
e same point A on the 12-sided polygon (Figure 19.18) is real-
ized in this topology by the switching combination of (320), where
the three numbers represent the level of voltages applied in the
three phases. It is also possible to use a common mode eliminated
inverter conguration, thereby eliminating the need for isolated
sources for open-end structure [23].
Althou ...