Samsung S3F84B8 manual Power Supply, 220 VAC

S3F84B8_ALL-IN-ONE IH COOKER_AN_REV 0.00 2 HARDWARE IMPLEMENTATION

2.2 POWER SUPPLY

Figure 2-2 shows the circuit diagram for power supply.

D6

AC_L

220 VAC

1N4007D7

D1

L1

T1

D4

UF4007

+18V

AC_N

1

5

D7

UF4007

330uH

R1

6

1N4007

1N4007

C1

100K/0.5W

4

8

102/1KV

+ C6

EE-19

+ C2

D2

U1

Z1

100uF/25V

78L05

+ C21

4.7uF/450V

UF4007

8

D4

S1

1

18V

UF4007

100uF/25V

VIN

1

+5V

7

2

D5

3

D3

S2

VOUT

6

3

2

+ C13

D2

FB

GND

5

D1

VDD

4

100uF/16V

IC1

VIPER12A

+ C8

C3

10uF/50V

104

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.

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