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3-2. Basic operation of horizontal output circuit
Q422
t
t t t
1
V
of Q422
B
Collector
Current
of Q422
The Voltage
at H-DY
The current
of resonant
Capacitor
(CT)
DAMP Diode
current
i1
Deflection
current
of H-DY
t
t
2 3 4
5
6
induced back EMF
Voltage is damped
through damping
Diode in Q402
i2
i4
i3
i1 (t1-t2)
CT
i2
i3
i4
t
t1
: Q422 is switched on.
t
t1-t2
: Collector current of Q422 rise linearly. i1 flows from CS
t2
: Q422 is switched off abruptly.
t2-t3
: Back EMF of H-DY maintains i1 direction and CT is
t3
: Q422 is still off
t3-t4
: CT is discharged back through H-DY.
t4-t5
: H-DY attempts to maintain i3 direction. Damping diode
- 29 -
is
3
Primary winding
of FBT
H-DY
CS
which have been left charged at the end of first half of
scan. is also flows, energy is stored in the primary
winding of FBT.
charged. Back EMF of the FBT primary occurs to
maintain is direction.
becones forward biased and CS is charged.
1
B+
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