8-49
8-11. Power Factor Controller Circuit
This circuit is composed of Low pass filter block and Power feedback block. AC input is rectified by D601, then
it charge C6Y2, C610 and C609.
C610 is not charged during period
α
and period
γ
from input voltage directly, because the voltage of C6Y2 is
smaller than the voltage of C610. Then, C610 is charged during period
α
and period
γ
by Power feedback
block. When TR1 (internal IC621) turn on, the N1 winding of T6Y1 is charged with energy. When TR1(internal
IC621) turn off, the N2 winding of T6Y1 discharge energy. So, the voltage of point A is the part of slant
line(Fig.8-12 : VC610-VC6Y2).And C610 is charged with feedback energy during period
α
and period
γ
,
because the voltage of point A is bigger than the voltage of C610.
C610 is charged during period
β
(Fig.8-12) from input voltage directly.(Power supply which doesn't have
“Power Factor Controller Circuit” is only charged during this period.)
Finally, the voltage of C610 and input current become Wave of Fig.8-12.The harmonic current is decrease,
and Power Factor is improved. Because C610 is charged not only period
β
but also many parts of 1 cycle.
POWER FEEDBACK BLOCK
(Fig.8-12) VOLTAGE
・
INPUT CURRENT
V
C610
V
C6Y2
GND
β
γ
Period
α
INPUT CURRENT
VOLTAGE
GND
V
C6Y2
<V
C610
V
C6Y2
>V
C610
V
C6Y2min
V
C6Y2
<V
C610
V
C6Y2
>V
C610
I
N2
I
N2
+I
D6Y2
+
GND
TR1
IC621
B
C
C
B
E
1
2
3
C611
R605
L601
D603
T601
T6Y1
+
-
D6Y2
N2
N1
C610
D6Y1
D6Y3
L6Y1
C6Y2
C6Y1
D601
AC
AC
POINT A
LOW PASS FILTER BLOCK
(Fig.8-11) POWER FOCTER CONTROLLER CIRCUIT
+
-
C609
Содержание FP1350 - MultiSync - 22" CRT Display
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Страница 104: ...5 63 Fig 3 11 EMF PWB CN EMF CN LL CN RR CNEM ...
Страница 165: ...8 17 Fig 3 1 HIGH VOLTAGE CIRCUIT AND PROTECTOR CIRCUIT AFC D FOCUS ...
Страница 240: ...for Human Potential ...