MEA 1786FD2
CRT Monitor Service Guide
Circuit Operation Theory
13
3.2 Rectifier and filter
2
4
3
1
~
~
-
+
D602~D605
20D6 * 4
+
400V
220U
(EL)
C612
L
N
DC OUTPUT
AC INPUT
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)
3.3 switching Element and isolation transformer
B61
C53
C51
C50
*
13
12
11
10
8
1
6
16
15
18
9
D613
ZD601
FR702
FR704
FR701
T601
Q602
L608
L606
L607
C613
C624
C614
D610
D608
D614
R607
R608
R611
R604
R619
C608
(OPEN)
(OPEN)
(SHORT)
(SHORT)
(SHORT)
FS14SM-12
(BEAD)
(BEAD)
(BEAD)
(D)
1KV
0.01U
(D)
1KV
220P
(OPEN)
EGP30B
UF4007
RGP10D
UF4007
2W
0.15
20K
1K
2W
82K
2W
470
25V
47U
(EL)
In a flyback converter operated in the discontinuous mode, the energy stored in the flyback
transformer (actually an inductor) must be zero at the beginning and end of each switching
period .
During the "ON" time, energy taken from the input is stored in the transformer when
the switching transistor turn-off, this stored energy is all delivered to the output.
Содержание 1786FD2
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