Actual circuit, 1. basic operation and current path – Toshiba TW40F80 User Manual

Page 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

is applied to C

and Csm, and the C

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

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

, Lm, L

FTB is transferred to C

, C

and C

, respectively, and the

resonant current becomes zero at a center of the flyback pe-

riod. Then, V

and V

pulses show a maximum amplitude.

H.OUT

FBT

Fig. 10-7

Fig. 10-8

Fig. 10-9

Fig. 10-10

: I

Voltage & current waveform in H period.