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AN4213
Designing a TM PFC
•
RMS diode current:
Equation 9
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 a good margin against mains surges.
Equation 10
Equation 11
The power dissipated on the bridge is calculated using
Equation 12:
Equation 12
where R
DIODE
and V
th
are given in the technical datasheet.
3.3.2
Input capacitor
The input capacitor has to attenuate the switching noise due to the high-frequency inductor
current ripple. The worst condition happens on the peak of the minimum rated input voltage
(V
INmin
=185 V).
The maximum high-frequency voltage ripple across C
IN
is usually imposed between 5% and
20% of the minimum rated input voltage.
This is expressed by a coefficient r (from 0.05 to 0.2) as an input design parameter.
•
Ripple voltage coefficient (%):
r = 0.2
Taking into account a minimum half-bridge switching frequency of 35 kHz and an output
power of 116 W, the input capacitor can be determined by the following equation.
Equation 13
A
V
V
I
I
OUT
AC
Lpk
DRMS
59
.
0
*
9
2
4
min
=
=
π
A
I
I
IN
INRMS
49
.
0
2
*
2
=
=
A
I
I
IN
avg
IN
31
.
0
*
2
=
=
−
π
avg
IN
TH
INRMS
DIODE
BRIDGE
I
V
I
R
P
−
+
=
*
*
4
*
*
4
2
min
min
*
*
*
2
AC
SW
IN
IN
V
r
f
I
C
π
=
F
C
IN
μ
086
.
0
185
*
2
.
0
*
35
*
14
.
3
*
2
7
.
0
=
=



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