Degaussing
When the set is switched on, the degaussing relay 1515 is immediately activated as
transistor 7580 is conducting. Due to the RC-time of R3580 and C2580, it will last about
3 to 4 seconds before transistor 7580 is switched off.
Basic IC Functionality
For a clear understanding of the Quasi-Resonant behavior, it is possible to explain it by
a simplified circuit diagram (see Figure below). In this circuit diagram, the secondary
side is transferred to the primary side and the transformer is replaced by an inductance
L
P
.C
D
is the total drain capacitance including the resonance capacitor C
R
, parasitic
output capacitor C
OSS
of the MOSFET and the winding capacitance C
W
of the
transformer. The turns ratio of the transformer is represented by n (N
P
/N
S
).
Figure:
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