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Embedded Software and Motor Control Libraries for PXR40xx

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Top <strong>and</strong> bottom switches work in a complementary mode; i.e., if the top switch, S At, is<br />

ON, then the corresponding bottom switch, S Ab, is OFF, <strong>and</strong> vice versa. Considering that<br />

value 1 is assigned to the ON state of the top switch, <strong>and</strong> value 0 is assigned to the ON<br />

state of the bottom switch, the switching vector, [a, b, c] T can be defined. Creating such<br />

a vector allows a numerical definition of all possible switching states. In a three-phase<br />

power stage configuration (as shown in Figure 4-59), eight possible switching states<br />

(detailed in Figure 4-60) are feasible.<br />

Figure 4-60. Basic space vectors<br />

These states, together with the resulting instantaneous output line-to-line <strong>and</strong> phase<br />

voltages, are listed in Table 4-143.<br />

Table 4-143. Switching patterns<br />

a b c U a U b U c U AB U BC U CA Vector<br />

0 0 0 0 0 0 0 0 0 O 000<br />

1 0 0 2/3*U<br />

DCBus<br />

1 1 0 1/3*U<br />

DCBus<br />

0 1 0 -1/3*U<br />

DCBus<br />

0 1 1 -2/3*U<br />

DCBus<br />

0 0 1 -1/3*U<br />

DCBus<br />

1 0 1 1/3*U<br />

DCBus<br />

-1/3*U<br />

DCBus<br />

1/3*U<br />

DCBus<br />

2/3*U<br />

DCBus<br />

1/3*U<br />

DCBus<br />

-1/3*U<br />

DCBus<br />

-2/3*U<br />

DCBus<br />

-1/3*U<br />

DCBus<br />

-2/3*U<br />

DCBus<br />

-1/3*U<br />

DCBus<br />

1/3*U<br />

DCBus<br />

2/3*U<br />

DCBus<br />

1/3*U<br />

DCBus<br />

Chapter 4 API References<br />

U DCBus 0 -U DCBus U 0<br />

0 U DCBus -U DCBus U 60<br />

-U DCBus U DCBus 0 U 120<br />

-U DCBus 0 U DCBus U 240<br />

0 -U DCBus U DCBus U 300<br />

U DCBus -U DCBus 0 U 360<br />

1 1 1 0 0 0 0 0 0 O 111<br />

<strong>Embedded</strong> <strong>Software</strong> <strong>and</strong> <strong>Motor</strong> <strong>Control</strong> <strong>Libraries</strong> <strong>for</strong> <strong>PXR40xx</strong>, Rev. 1.0<br />

Freescale Semiconductor, Inc. 515

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