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AN3112 датащи(PDF) 15 Page - STMicroelectronics

номер детали AN3112
подробное описание детали  Solution for designing a fixed off-time controlled PFC pre-regulator
PDF  36 Pages
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производитель  STMICROELECTRONICS [STMicroelectronics]
домашняя страница  http://www.st.com
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AN3112 датащи(HTML) 15 Page - STMicroelectronics

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AN3112
Designing a fixed-off-time PFC
Doc ID 16820 Rev 3
15/36
To calculate the required inductance L of the boost inductor, use the following formula with a
3.76 µs off-time set at 90 Vac (see the following ZCD pin dimensioning to find the meaning
of this value):
Equation 28
After calculating the inductor value at low mains and at high mains L(VACmax), L(VACmin)
(
Equation 28) depending also on the off-time, the minimum value must be taken into
account. It becomes the maximum inductance value for the PFC dimensioning.
Figure 8 shows the switching frequency versus the
θ angle calculated inverting Equation 28
with a 500 µH boost inductance and fixing the line voltage at minimum and maximum
values.
Figure 8.
Switching frequency fixing the line voltage
)
VAC
(
T
IL
V
)
k
1
(
)
VAC
(
L
OFF
pk
out
min
∆
⋅
−
=
H
501
s
76
.
3
A
04
.
2
V
400
)
32
.
0
1
(
)
VAC
(
L
min
µ
=
µ
⋅
−
=
Frequency modulation with the Line half period
1
10
100
1000
0
0.4
0.8
1.2
1.6
2
2.4
2.8
÷ [Linehalf period]
Switching Freq.@VacMin
Switching Freq.@VacMax
CCM
DCM
DCM
TM
TM
θ1
θ2
θ



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