AN2533/D

Detailed Function Description

MOTOROLA

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

17

Figure 8. svmStd3Xor_sync state diagram

Resolver Reference

Signal for Standard

Space Vector

Modulation – 3

outputs version –

XOR version

(svmStd3Xor_res)

The svmStd3Xor_res TPU function uses information read from the

svmStd3Xor_R and svmStd3Xor_T functions, the actual PWM center times

and the PWM periods. This allows a signal to be generated, which tracks the

changes of the PWM period and is always synchronized with the PWM. The

resolver reference signal is a 50% duty-cycle signal with a period equal to

prescaler or synchronization channel presc_copy PWM periods (see next

paragraph). The low to high transition of the pulse can be adjusted by a

parameter, either negative or positive, to go a number of TCR1 TPU cycles

before or after the PWM period center time.

Figure 9. Resolver reference signal adjustment examples

S1

S2

S3

INIT

HSR = 10

S1

S2

S3

INIT

HSR = 10

center_time

T

center_time

T

center_time

T

|move|

move < 0

prescaler = 2

center_time

T

center_time

T

center_time

T

|move|

move > 0

prescaler = 1

Freescale Semiconductor, Inc.

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