Actual circuit, 1. basic operation and current path – Toshiba TW40F80 User Manual
Page 84
84
3-1. Basic Operation and Current Path
3-1-1. Later Half Scanning Period
When the power is turned on, the power supply voltage V
B
is applied to C
S
and Csm, and the C
S
acts as a power source
for a later half of the scanning period for which the H. OUT
transistor is turned on, and the deflection current I
Y
flows in
the path as shown below.
3-1-2. First Half Scanning Period
When the base drive current decreases and the H. OUT tran-
sistor is turned off, each energy stored in L
DY
, Lm, L
P
of
FTB is transferred to C
1
, C
2
and C
3
, respectively, and the
resonant current becomes zero at a center of the flyback pe-
riod. Then, V
A
and V
B
pulses show a maximum amplitude.
H.OUT
V
A
FBT
L
DY
lP
Cs
V
B
V
B
D
M
I
M
L
M
I
DC
C
SM
+
I
Y
+
V
A
FBT
L
DY
lP
Cs
V
B
V
B
I
M
L
M
I
DC
C
SM
I
Y
I
Y2
I
P2
C
2
C
1
I
P1
Fig. 10-7
Fig. 10-8
Fig. 10-9
Fig. 10-10
I
Y
V
A
0
0
0
0
I
DC
I
M
V
B
0
C
1
C
2
0
C
3
C
1
: I
Y1
+I
P1
C
2
: I
Y2
+I
P2
C
3
: I
P2
-
I
Y1
-
I
M
Voltage & current waveform in H period.
I
Y
V
A
0
0
0
0
I
DC
I
M
V
B