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CHAPTER 5 POWER SUPPLY
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2. INTRODUCTION TO BASIC POWER SUPPLIES

3. POWER SUPPLY SYSTEM
The power supply system has an input which is either ac or dc and, for our discussions, a dc output. This dc output is used to power some form of electronic circuitry.
The input could be the 240V 50Hz mains supply or a dc supply from a car battery or even a power rail within an existing circuit.

4. POWER SUPPLY SYSTEM
Breaking this system down , we will first look at the ac voltage change and ac to dc conversion.
Then, we will look at some simple dc regulation circuitry

5. types Linear Power supply Switched Mode Power Supply
Uninterrupted Power Supply

6. Linear Power Supply
Uses a transformer to convert from wall ac to different low voltage
Consist a transformer , rectifier, filter, regulator.

7. Switch Mode Power Supply
Incooperates regulator
Uses a switching transistor
Pulse Width Modulation techniq
Chops dc voltage
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