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2.2 Switching Power Supply Operation Theory
2.2.1 General Specification
Input Voltage : 90~264VAC (FULL RANGE)
Input Frequency : 47~63Hz
Output Requirement :
2.2.2 Block Diagram
AC
RFI
INPUT
FILTER
2.2.3 Circuit Operation Theorem
2.2.3.1 RFI Filter
L
N
FG
This circuit designed to inhibit electric and magnetic interference for meet FCC, VDE, VCCI
standard
requirements.
2.2.3.2 Rectifier and Filter
L
AC INPUT
N
When power switch is turn on, the AC voltage is Rectifier and filter by D602~D605, C612. The DC
output voltage will be 1.4*(ac input)
2-8
Output
+6.3V
+15V
+80V
+45V
DEGAUSS
CIRCUIT
RECTIFIER
SWITCHING
&
ELEMENT
FILTER
FEEDBACK
CONTROL
CIRCUIT
L602
C601
0.47U
3
4
R601
250V
(X)
1
2
D602~D605
3
~
4
-
~
2
API Confidential
No Copy/Reproduction Allowed
MAX. Load Current
0.7A
1.0A
0.15A
1.0A
ISOLATION
TRANSFOR
-MER
POWER
SAVING
CONTROL
C603
2200P
250V
(Y)
C602
2200P
250V
(Y)
20D6 * 4
1
+
C612
+
220U
DC OUTPUT
400V
(EL)
OUTPUT
RECTIFIER
AND
OUTPUT
FILTER
L603
L604
7277e Monitor Service Guide
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