AN2530 Freescale Semiconductor / Motorola, AN2530 Datasheet - Page 14

• Manufacturer Part Number: AN2530
• Description: Standard Space Vector Modulation with Dead-Time Correction TPU Function Set
• Manufacturer: Freescale Semiconductor / Motorola

AN2530/D
Minimum Pulse Width
14
Phase C
Phase C
Phase A
Phase A
Phase B
Phase B
- bottom
- bottom
- bottom
- bottom
- bottom
- bottom
- top
- top
- top
- top
- top
- top
HSR = 10
HSR = 10
INIT
INIT
Standard Space Vector Modulation with Dead-Time Correction TPU Function Set (svmStdDt)
Figure 5. svmStdDt_top and svmStdDt_bottom state diagram
The TPU cannot generate PWM signals with duty cycle ratios very close to 0%
or 100%. The minimum pulse width that the TPU can be guaranteed to correctly
generate is determined by the TPU function itself and by the activity on the
other channels. When the TPU function is requested to generate a narrower
pulse a collision can occur. To prevent this, the parameter MPW (minimum
pulse width) is introduced. The TPU functions svmStdDt_top and
svmStdDt_bottom limit the narrowest generated pulse widths to MPW. The
CPU program should check, and limit, the maximum amplitude of the Stator
Reference Voltage Vector before decomposition to u
maximum amplitude of the Stator Reference Voltage Vector should be less
than
If this is not the case, the TPU function will start to limit the minimum pulse
widths to MPW to prevent a collision, and the duty cycle ratio traces will be
deformed as shown on
flag0 = 1
flag0 = 1
Freescale Semiconductor, Inc.
flag0 = 1
flag0 = 1
flag0 = 1
For More Information On This Product,
flag0 = 0
flag0 = 0
Go to: www.freescale.com
Figure
LH_RLD
LH_RLD
1
6.
( 2
no reload yet
no reload yet
reload
reload
MPW
T
C1234
C1234
2
HL
HL
DT
LH
LH
3-times
3-times
4
4
)
th
th
-time
-time
á
, u
LH_C5
LH_C5
â
components. The
HL
HL
MOTOROLA
HSR = 11
HSR = 11
STOP
STOP