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PDF AN2528 Data sheet ( Hoja de datos )
| Número de pieza | AN2528 | |
| Descripción | Standard Space Vector Modulation TPU Function Set | |
| Fabricantes | FREESCALE | |
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Application Note
Freescale Semiconductor, Inc.
AN2528/D
Rev. 0, 5/2003
Standard Space Vector
Modulation TPU Function Set
(svmStd)
By Milan Brejl, Ph.D.
Functional Overview
Standard Space Vector Modulation (svmStd) is a technique that is used to
implement a straightforward method of switching motor windings in
applications such as AC induction motor control and PMSM motor control. The
function set consists of 5 TPU functions:
• Standard Space Vector Modulation – Top (svmStd_top)
• Standard Space Vector Modulation – Bottom (svmStd_bottom)
• Synchronization Signal for Standard Space Vector Modulation
(svmStd_sync)
• Resolver Reference Signal for Standard Space Vector Modulation
(svmStd_res)
• Fault Input for Standard Space Vector Modulation (svmStd_fault)
The svmStd_top and svmStd_bottom TPU functions work together to generate
a 6-channel 3-phase center-aligned PWM signal with dead-time between the
top and bottom channels. The Synchronization Signal for the svmStd function
Phase A - top
Phase A - bottom
Phase B - top
Phase B - bottom
Phase C - top
Phase C - bottom
Synchronization signal
Resolver reference signal
Fault (input signal)
Change of
PW M period
FAULT !
1.6 ms
New
IN IT IA LIZ A T IO N
Figure 1. Signals generated by svmStd TPU function set
© Freescale Semiconductor, Inc., 2004. All rights reserved.
For More Information On This Product,
Go to: www.freescale.com
© Motorola, Inc., 2003
1 page  
Freescale Semiconductor, Inc.
AN2528/D
Detailed Function Description
The following figures show the input Stator Reference Voltage Vector
components uá and uâ, corresponding sectors and output PWM signal duty
cycle ratios:
Components of the Stator Reference Voltage Vector
1
0.5
0
-0.5
-1
0
alpha
beta
60 120 180 240 300 360
angle
1
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
00
Standard Space Vector Modulation Technique
Phase A
Phase B
Phase C
60 120 180 240 300 360
angle
Sector 1 Sector 2 Sector 3 Sector 4 Sector 5 Sector 6
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 tlow-high and thigh-low of each
channel are calculated:
Uβ = T ⋅uβ
Uα = T ⋅ uα
X =Uβ
Y = Uβ +Uα 3
2
Z = Uβ −Uα 3
2
Sector:
`Ã1Ã `Ã32Ã
aÃ1Ã aÃ32Ã aÃ1Ã aÃ32Ã
YÃ12Ã YÃ3Ã YÃ12Ã YÃ3Ã
V. IV. III. VI.
I.
II.
Standard Space Vector Modulation TPU Function Set (svmStd)
For More Information On This Product,
Go to: www.freescale.com
5
5 Page 
Freescale Semiconductor, Inc.
AN2528/D
Detailed Function Description
Table 10. svmStd_bottom State Statistics
State
C1
C2
C3
C4
Max IMB Clock Cycles
48
48
50
48
RAM Accesses by TPU
3
4
3
8
NOTE: Execution times do not include the time slot transition time (TST = 10 or 14 IMB
clocks)
- top
Phase A
- bottom
- top
Phase B
- bottom
- top
Phase C
- bottom
HL
LH_RLD
flag0 = 1
HL
LH
LH_C5
HL
HL
LH
LH_C5
HL
HL LH_C5
LH HL
HL LH_C5
LH HL
LH_C5
HL
HL
LH_RLD C1 C2 C3 C4
center_time
center_time
T
not a reload period
T
reload period
Figure 3. svmStd_top and svmStd_bottom timing
LH_C5
HL
NOTE: The bottom channel with longest momentary low-time is marked by a flag0 and
runs the LH_RLD and C1, C2, C3, C4 states.
Standard Space Vector Modulation TPU Function Set (svmStd)
For More Information On This Product,
Go to: www.freescale.com
11
11 Page | ||
| Páginas | Total 28 Páginas | |
| PDF Descargar | [ Datasheet AN2528.PDF ] | |
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