Toshiba TW40F80 User Manual
Page 85
85
3-1-3. Later Half of Flyback Period
All energy in the coil has been transferred to the resonant
capacitors at the center of the flyback period, and the volt-
age shows the maximum value. However, during next half
of the flyback period, the energy of the resonat capacitor is
discharged as a reverse current through respective coil. When
the discharge has been completed, V
A
and V
B
becomes zero,
and the deflection current in reverse direction becomes the
maximum.
3-1-4. First Half of Scanning Period
When the flyback period completes, the damper diode D
D
and the modulation diode D
M
turn on, and the I
Y
and I
M
proportionally decrease from the maximum value to zero.
The H. OUT transistor is turned on just preceding at the center
of the scanning period, and repeats the steps 3-1-1 through
3-1-4 stated above.
I
P1
I
P2
C
1
C
2
V
A
L.O.P.T
I
Y
I
Y2
L
DY
I
P
C
S
V
B
V
B
L
M
I
DC
C
3
I
M
C
SM
I
Y1
D
D
V
A
FBT
I
Y
L
DY
C
S
V
B
V
B
L
M
I
M
C
SM
I
M
D
M
Fig. 10-11
Fig. 10-12
Fig. 10-13
Fig. 10-14
Iy
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