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7546A–AVR–12/05

Application Note

As shown on Figure 4-3., the angle between two successive non-zero voltages is always 60

degrees. I n c o m p l e x f o r m , t h e s e n o n - z e r o p h a s e v o l t a g e s c a n b e w r i t t e n a s ) 1 ( = k j k e E V

π 3

, with k = 1..6 and

V . T a b l e 4 - 1 . s h o w s t h e l i n e - t o - l i n e a n d l i n e - t o - n e u t r a l v o l t a g e s i n e a c h o f t h e 8 p o s - 0 7 0 = = sible configurations of the inverter. V V

Figure 4-3.

Representation of the eight possible switching configurations in the Concordia reference frame

Vab

Vbc

Vca

Van

Vbn

Vcn

Vα

Vβ

0

0

0

0

0

0

0

0

0

-E

E

-E/3

-E/3

+2E/3

-E/2

E 3 2

-E

E

0

-E/3

+2E/3

-E/3

-E/2

E 32

-E

0

E

-2E/3

-E/3

-E/3

-E

0

E

0

-E

+2E/3

-E/3

-E/3

E

0

E

-E

0

E/3

-2E/3

E/3

E/2

E 3 2

0

E

-E

E/3

E/3

-2E/3

E/2

E 32

0

0

0

0

0

0

0

0

Table 4-1.

Sa+

Sb+

0

0

0

0

0

1

0

1

1

0

1

0

1

1

1

1

Switching configurations and output voltages of a 3-phase inverter

Sc+ 0 1 0 1 0 1 0

S S0 S S2 S S4 S S6

1

i

3

5

1

S7

V V0 V V V4 V V6 V2 V 1 i 5 3 7

3

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