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参数资料
| 型号： | LB1951V |
| 元件分类： | 运动控制电子 |
| 英文描述： | BRUSHLESS DC MOTOR CONTROLLER, 1 A, PDSO24 |
| 封装： | SSOP-24 |
| 文件页数： | 7/9页 |
| 文件大小： | 229K |
| 代理商： | LB1951V |
LB1951V
No. 5232-7/9
i) Overlap creation
Because the voltage generated in the amplitude control block is: 2
× O.L. × (1/2 VS –VX ) for each side,
(using the midpoint as the reference point), the point at which the two waveforms cross each other is O.L. (1/2 VS –VX )
from the midpoint.
Because that waveform is clamped at (1/2 VS –VX ) with the midpoint as the reference point, the overlap equals A/B
× 100, which equals O.L. × 100 (%).
ii) Overlap calculation
(1) Upper overlap amount
Calculated midpoint VN =
(VS –VXH –VXL )
+VXL =
(VS –VXH +VXL)
2
Because A = V
α –VN and B =VS –VXH – VN, the upper overlap amount is calculated as follows:
Overlap amount =
A
=
V
α –{(VS –VXH +VXL )/2}
× 100
B
VS –VXH – {(VS –VXH +VXL )/2}
=
2V
α –(VS –VXH )–VXL
× 100 (%)
(VS –VXH )–VXL
(2) Lower overlap amount
Because C = VN – V
β and D = VN – VXL , the lower overlap amount is calculated as follows:
Overlap amount =
C
=
{( VS –VXH +VXL )/2} – Vβ
× 100
D
{(VS –VXH +VXL )/2} – VXL
=
(VS –VXH )+VXL –2Vβ
× 100 (%)
(VS –VXH )–VXL
Overlap Creation and Calculation
VS-VXH
V
α
VS
V
β
VXL
Calculated
midpoint
VN
AB
CD
Absolute
voltage
Electrical
angle 180
°
Time
Lower clamp potential VXL
Lower residual voltage VXL
Upper residual voltage VXH
VS
Upper clamp potential
VS–VXH
O.L
×(
–VXH)
–VXH
VS
2
VS
2
A12474
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