AN2533/D

Detailed Function Description

MOTOROLA

Standard SVM – 3 outputs version – XOR version TPU Function Set (svmStd3Xor)

5

values are prepared by setting the LD_OK parameter. The TPU notifies the

CPU that the reload values have been read and new values can be written by

clearing the LD_OK parameter.

The TPU writes the parameter Sector that indicates the current Stator

Reference Voltage Vector position in sector 1 to 6.

The following figures show the input Stator Reference Voltage Vector

components uá and uâ, corresponding sectors and output PWM signal duty

cycle ratios:

Figure 2. Standard Space Vector Modulation Technique

The following equations describe how the Space Vector Modulation PWM

signal high-times htA, htB, htC and transition times ttrans of each channel are

calculated:

0

60

120

180

240

300

360

0

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

0.9

1

Phase A

Phase B

Phase C

0

60

120

180

240

300

360

-1

-0.5

0

0.5

1

Components of the Stator Reference Voltage Vector

Standard Space Vector Modulation Technique

alpha

beta

angle

angle

Sector 1 Sector 2 Sector 3 Sector 4 Sector 5 Sector 6

0

60

120

180

240

300

360

0

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

0.9

1

Phase A

Phase B

Phase C

0

60

120

180

240

300

360

-1

-0.5

0

0.5

1

Components of the Stator Reference Voltage Vector

Standard Space Vector Modulation Technique

alpha

beta

angle

angle

0

60

120

180

240

300

360

0

60

120

180

240

300

360

0

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

0.9

1

Phase A

Phase B

Phase C

Phase A

Phase B

Phase C

0

60

120

180

240

300

360

0

60

120

180

240

300

360

-1

-0.5

0

0.5

1

-1

-0.5

0

0.5

1

Components of the Stator Reference Voltage Vector

Standard Space Vector Modulation Technique

alpha

beta

angle

angle

Sector 1 Sector 2 Sector 3 Sector 4 Sector 5 Sector 6

Sector 1 Sector 2 Sector 3 Sector 4 Sector 5 Sector 6

β

β

u

T

U

⋅

=

α

α

u

T

U

⋅

=

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com