LB1951 查看數據表（PDF） - SANYO -> Panasonic
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LB1951 Datasheet PDF : 9 Pages
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Overlap Creation and Calculation
LB1951V
VS
VS-VXH
Vα
Absolute
voltage
Calculated
midpoint
VN
Vβ
VXL
A
B
Electrical
angle 180°
C
D
VS
Upper residual voltage VXH
Upper clamp potential
VS–VXH
O.L×(V2S –VXH)
VS
2
–VXH
Lower clamp potential VXL
Lower residual voltage VXL
Time
A12474
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
2
)
+VXL
= (VS –VXH +VXL)
2
Because A = Vα –VN and B =VS –VXH – VN, the upper overlap amount is calculated as follows:
Overlap amount = A = Vα –{(VS –VXH +VXL )/2}
× 100
B VS –VXH – {(VS –VXH +VXL )/2}
=
2Vα –(VS –VXH )–VXL
(VS –VXH )–VXL
× 100 (%)
(2) Lower overlap amount
Because C = VN – Vβ 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
(VS –VXH )–VXL
× 100 (%)
No. 5232-7/9
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