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| 型號： | DG-IRMCK203 |
| 廠商： | International Rectifier |
| 英文描述： | Application Developer’s Guide |
| 中文描述： | 應(yīng)用程序開發(fā)指南 |
| 文件頁數(shù)： | 59/67頁 |
| 文件大?。?/td> | 1680K |
| 代理商： | DG-IRMCK203 |
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IRMCK203 Application Developer’s Guide
This document is the property of International Rectifier and may not be copied or distributed without expressed consent.
59
SVPWM Gain
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0
1000
2000
3000
4000
5000
6000
7000
M
V
Figure 22. Transfer Characteristics
The maximum achievable modulation (Umag_L) in the linear operating range is given by:
Scl
Mod
L
Umag
_
/
3
*
2
_
=
Over modulation
occurs when modulation Umag > Umag_L. This corresponds to the condition where the voltage
vector in Figure 23 increases beyond the hexagon boundary. Under such circumstance, the Space Vector PWM
algorithm will rescale the magnitude of the voltage vector to fit within the Hexagon limit. The magnitude of the
voltage vector is restricted within the Hexagon; however, the phase angle (
θ
) is always preserved. The transfer gain
(Figure 22) of the PWM modulator reduces and becomes non-linear in the over modulation region.
V3
25
V1
V2
V4
V5
V6
sector 1
sector 2
sector 3
sector 4
sector 5
sector 6
U-phase
Requested
Voltage Vector
Generated
Voltage Vector
Figure 23. Voltage Vector Rescaling
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