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AN3027 Scheda tecnica(PDF) 10 Page - STMicroelectronics

Il numero della parte AN3027
Spiegazioni elettronici  How to design a transition-mode PFC pre-regulator
PDF  41 Pages
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Produttore elettronici  STMICROELECTRONICS [STMicroelectronics]
Homepage  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN3027 Scheda tecnica(HTML) 10 Page - STMicroelectronics

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Designing a TM PFC
AN3027
10/41
Doc ID 16134 Rev 4
●
RMS switch current:
Equation 7
●
RMS diode current:
Equation 8
3.3
Power section design
3.3.1
Bridge rectifier
The input rectifier bridge can use standard slow recovery, low-cost devices. Typically a
600 V device is selected in order to have good margin against mains surges. An NTC
resistor limiting the current at turn-on is required to avoid excessive stress to the diode
bridge.
The rectifier bridge power dissipation can be calculated using
Equation 9, Equation 10,
Equation 11. The threshold voltage and dynamic resistance of a single diode of the bridge
can be found in the datasheet of the device.
Equation 9
Equation 10
The power dissipated on the bridge GBU4J is:
Equation 11
out
min
pk
rms
V
VAC
9
2
4
6
1
IL
ISW
⋅
π
⋅
−
⋅
=
A
18
.
1
V
400
Vac
90
9
2
4
6
1
A
38
.
3
ISWrms
=
⋅
π
⋅
−
⋅
=
out
min
pk
rms
V
VAC
9
2
4
IL
ID
⋅
π
⋅
⋅
=
A
72
.
0
V
400
Vac
90
9
2
4
A
38
.
3
IDrms
=
⋅
π
⋅
⋅
=
A
84
.
0
2
A
19
.
1
2
2
I
2
I
in
inrms
=
⋅
=
⋅
=
A
54
.
0
A
19
.
1
2
I
2
I
in
avg
_
in
=
π
⋅
=
π
⋅
=
avg
_
in
th
inrms
2
diode
bridge
I
V
4
I
R
4
P
⋅
⋅
+
⋅
⋅
=
W
62
.
1
A
54
.
0
V
7
.
0
4
)
A
84
.
0
(
04
.
0
4
P
2
bridge
=
⋅
⋅
+
⋅
Ω
⋅
=



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