AN2528 Datasheet, PDF (20/28 Pages) Freescale Semiconductor, Inc – Standard Space Vector Modulation TPU Function Set (svmStd)

AN2528/D
Freescale Semiconductor, Inc.
HSR = 10
INIT
S1
S2
S3
Figure 11. svmStd_sync state diagram
Resolver Reference
Signal for Standard
Space Vector
Modulation
(svmStd_res)
The svmStd_res TPU function uses information read from the svmStd PWM
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.
move > 0
prescaler = 1
|move|
center_time
T
move < 0
prescaler = 2
|move|
center_time
T
center_time
T
center_time
T
center_time
T
Figure 12. Resolver reference signal adjustment examples
20
Standard Space Vector Modulation TPU Function Set (svmStd)
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