Switched Mode Power Supply uses a switching regulator to convert electric power efficiently. SMPS transfers electric power from a source ( AC mains) to the load by converting the characteristics of current and voltage. SMPS always provide a well regulated power to the load irrespective of the input variations. SMPS incorporates a Pass transistor that switches very fast typically at 50Hz and 1 MHz between the on and off states to minimize the energy waste. SMPS regulates the output power by varying the on to off time using minimum voltage so that efficiency is very high compared to the linear power supply.
What is inside a SMPS?


Fig. 3: Image Showing Commonly used SMPS Inverter
Components of SMPS Contd..


Fig. 6: Table Showing Voltage Levels In 24 Pin Connector
Pin No
|
Wire Color
|
Output
|
1
|
Orange
|
+3.3 V
|
2
|
Orange
|
+3.3 V
|
3
|
Black
|
GND
|
4
|
Red
|
+5 V
|
5
|
Black
|
GND
|
6
|
Red
|
+5 V
|
7
|
Black
|
GND
|
8
|
Gray
|
|
9
|
Purple
|
+5 V Standby
|
10
|
Yellow
|
+12 V
|
11
|
Yellow
|
+12 V
|
12
|
Orange
|
+3.3 V
|
13
|
Orange
|
+3.3 V
|
14
|
Blue
|
-12 V
|
15
|
Black
|
GND
|
16
|
Green
|
|
17
|
Black
|
GND
|
18
|
Black
|
GND
|
19
|
Black
|
GND
|
20
|
White
|
-5 V
|
21
|
Red
|
+5 V
|
22
|
Red
|
+5 V
|
23
|
Red
|
+5 V
|
24
|
Black
|
GND
|
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