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NCP1910
I in
L
I L
Bulk voltage (V bulk )
V in
C in
C bulk
R SENSE
Figure 41. CCM PFC Boost Converter
PFC Methodology
The NCP1910 uses a proprietary PFC methodology
particularly designed for CCM operation. The PFC
methodology is described in this section.
? V in is the rectified input voltage,
? T is the switching period,
? t 1 is the MOSFET on time, and
? t 2 is the MOSFET off time.
The input filter capacitor C in and the front ? ended EMI
filter absorbs the high ? frequency component of inductor
current I L . It makes the input current I in a low ? frequency
signal only of the inductor current.
Where:
I in + I L ? 50
(eq. 2)
t 2
V in T * t 1
V in + V bulk
Z in + +
Figure 42. Inductor Current in CCM
As shown in Figure 42, the inductor current I L in a
switching period T includes a charging phase for duration t 1
and a discharging phase for duration t 2 . The voltage
conversion ratio is obtained in Equation 1.
V bulk t 1 ) t 2 T
+ +
(eq. 1)
T * t 1
T
Where:
? I in is the input AC current.
? I L is the inductor current.
? I L ? 50 supposes a 50 Hz operation. The suffix 50
means it is with a 50 Hz bandwidth of the original
I L .
From Equations 1 and 2, the input impedance Z in is
formulated.
V in T * t 1 V bulk
(eq. 3)
I in T I L * 50
where: Z in is input impedance.
Power factor is corrected when the input impedance Z in in
Equation 3 is constant or varies slowly in the 50 or 60 Hz
bandwidth.
? V bulk is the output voltage of PFC stage,
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