Samsung S3F84B8 - Manual (Page 12)

S3F84B8_ALL-IN-ONE IH COOKER_AN_REV 0.00 2 HARDWARE IMPLEMENTATION
2-6
2.2 POWER SUPPLY
Figure 2-2 shows the circuit diagram for power supply.
1 5
6
4 8
T1
EE-19
D5
UF4007
D4
8
D3
7
D2
6
D1
5
S1
1
S2
2
FB
3
VDD
4
U1
VIPER12A
220 VAC
D1
1N4007
+ C8
10uF/50V
VIN
1
GND
2 VOUT
3
IC1
78L05
D7 UF4007
Z1
18V
+ C6
100uF/25V
+ C2
4.7uF/450V
C1
102/1KV
R1
100K/0.5W
+ C21
100uF/25V
+ C13
100uF/16V
AC_L
+5V
D2
UF4007
AC_N
D6
1N4007
C3
104
D7
1N4007
D4 UF4007
L1
330uH
+18V
Figure 2-2 Power Supply Circuit
The power circuit contains a transformer, an SMPS primary switcher, and a +5V DC regulator. After passing
through a half-wave rectifier and an LC filter, the 220V AC power enters the primary side of transformer.
Thereafter, VIPER12 and 78L05 produce stable +18V DC power for the transistors and +5V DC power for the
MCU and other devices.