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, VA and VB becomes zero, and the deflection current in reverse direction becomes the

maximum.

 

 

 

VA

 

 

 

 

 

 

L.O.P.T

 

IP2

 

IY

LDY

 

IP1

 

IP

 

C1

C2

 

 

 

 

 

 

 

 

 

 

CS

 

 

IY1

IY2

 

 

 

 

 

 

 

 

 

 

 

 

VB

VB

 

 

C3

 

LM

 

 

 

 

IM

 

 

 

 

IDC

 

 

 

 

 

 

 

 

 

 

CSM

 

 

Fig. 10-11

 

 

 

3-1-4. First Half of Scanning Period

When the flyback period completes, the damper diode DD and the modulation diode DM turn on, and the IY and IM 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.

 

 

VA

 

 

FBT

 

 

LDY

DD

IY

 

 

 

CS

 

 

VB

 

 

VB

DM

IM

LM

 

IM

 

 

 

 

CSM

Fig. 10-13

Voltage & current waveform in H period.

Iy 0

VA 0

IM 0

IDC

VB 0

C1

C2 0

C3 0

C1: IY1+IP1

C2: IY2+IP2

C3: IP2-Iy1-IM.

IY

0

VA

0

 

IM

0

 

IDC

VB

0

 

Fig. 10-14

Fig. 10-12

85

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Image 85
Toshiba TW40F80 manual Later Half of Flyback Period, First Half of Scanning Period, P.T