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KX-F910BX
12. SWITCHING POWER SUPPLY SECTION
AC Input
Input
Rectifier
Circuit
Circuit
A-B Voltage Wave Form
0
C-D Voltage Wave Form
0
E-F
Voltage Wave Form
G-H
0
[Input Circuit]
Input current goes into input rectifier circuit through filter circuit. Fitter circuit decreases noise terminal voltage and
noise electric field strength.
[Rectifier Circuit]
Input current is rectified by D101 and charge C106 to make DC voltage, then supply power to converter
circuit. Voltage is supplied to control IC's kick-on voltage through R102 and R103. Inrush current is limited by
thermistor TH101.
[Converter circuit]
The converter circuit of this power supply circuit is called fly back converter.
We explain the operation of this circuit with the simple circuit.
Ei
Q101
CONTROL CIRCUIT
Block Diagram
A
Converter
+
Circuit
C106
-
Q101
B
C
D
Control
Circuit
Over
SUB Printed
Current
Circuit Board
Circuit
IC101
T101
D201
P
S
B
G
24V
Output Circuit
H
E
F
Error Detecting
Circuit
P...PRIMARY WINDING
Eo
S...SECONDARY WINDING
+
B...CONTROL WINDING
|164 |
24V Output
GND
DC-DC
Converter
Circuit
+5V Output
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