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(c) Converter circuit
The converter circuit consists of the primary winding of the switching transformer T601, a
switching device 0603, and surge absorbers (C608, R606, C609, D603, and R607) that are
connected in serial to the primary winding.
The oscillating signal from IC601 pin 2 is applied to the gate of 0603 causing the drain-source
to
be
turned on and off so that oscillating voltage is applied to the primary winding of T601.
(d) Output filtering circuit
C608
R606
From IC601 pin 2
DRIVE
CIRCUIT
(Fig. 2-1-3) Converter Circuit
The fly-back voltage generated at the secondary windings of the switching transformer T601 are
rectified by D651, D652, and D653. The, it is filtered by C653, C654, C656, C657, C663, and
C664 so that rectified DC voltages are obtained.
The fly-back voltage is constantly maintained by controlling the ON period duty cycle of 0603
in the converter circuit.
T601
D651
C653
C654
C656
C657
C663
C664
(Fig. 2-1-4) Output Smoothing Circuit
-48-
+170V
+85V
+24V
GND
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