AN2528 Freescale Semiconductor / Motorola, AN2528 Datasheet - Page 20

• Manufacturer Part Number: AN2528
• Description: Standard Space Vector Modulation TPU Function Set
• Manufacturer: Freescale Semiconductor / Motorola

AN2528/D
Resolver Reference
Signal for Standard
Space Vector
Modulation
(svmStd_res)
20
HSR = 10
HSR = 10
INIT
INIT
S1
S1
Standard Space Vector Modulation TPU Function Set (svmStd)
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 < 0
prescaler = 2
Freescale Semiconductor, Inc.
Figure 11. svmStd_sync state diagram
For More Information On This Product,
S2
S2
|move|
Figure 12. Resolver reference signal adjustment examples
center_time
center_time
T
T
Go to: www.freescale.com
|move|
S3
S3
center_time
center_time
center_time
T
T
T
center_time
T
MOTOROLA