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1
Power Supply Design
Designed By :
Arsalan Khan GP2
Outline…
 What is Power supply?
 Need for Power supply
 Elements of Power supply
 Transformer
 Rectifier
 Capacitor
 Voltage Regulators
3
Why we go for power supply
studies?
All electronic circuits need
smooth DC power supply in
order to function correctly. 
The DC power supplied
either from battery or
power pack units
4
Contd…
 The battery power supply may not be economical
 Some other circuits, those using digital ICs, also need
their power supply to be regulated. 
5
Elements of a Power Supply
 Transformer
 Rectifier
 Capacitor
 Regulator
6
TRANSFORMER
 The AC line voltage available for
commercial purpose is not suitable for
electronic circuits.
 Most of the electronic circuits require a
considerably lower voltage
7
Contd…..
 The transformer is a device used to convert the ac
line voltage to a voltage level more appropriate to
the needs of the circuit to be operated
 At the same time, the transformer provides electrical
isolation between the ac line and the circuit to be
operated.
 This is an important safety consideration.
8
Contd….
 The output of the
transformer is still an ac
voltage, but now of an
appropriate magnitude for
the circuit to be powered. 
9
Rectifiers
 Rectifier is a device which convert AC
voltage in to pulsating DC
 A rectifier utilizes unidirectional
conducting device Ex : P-N junction
diodes
10
Filter CircuitsFilter Circuits
 The output from the rectifier
section is a pulsating DC.
 The filter circuit reduces the
peak-to-peak pulses to a small
ripple voltage.
1111
11
Regulator
 It converts pulses dc coming from capacitor into
straight line dc
12
Block diagram of a Power Supply
13
Fields?14
Application
 DC power is widely used in low voltage applications
such as charging batteries, automotive applications,
aircraft applications and other low voltage, low
current applications. All solar panels nowadays
produce DC power.
 Common applications with DC power in the
PV industry are portable solar systems and other off-
grid appliances. Not using a solar inverter to convert
DC to AC will keep the costs down for such systems.
15
THANK YOU
16

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Power supply By Arsalan Khan GP

  • 1. 1
  • 2. Power Supply Design Designed By : Arsalan Khan GP2
  • 3. Outline…  What is Power supply?  Need for Power supply  Elements of Power supply  Transformer  Rectifier  Capacitor  Voltage Regulators 3
  • 4. Why we go for power supply studies? All electronic circuits need smooth DC power supply in order to function correctly.  The DC power supplied either from battery or power pack units 4
  • 5. Contd…  The battery power supply may not be economical  Some other circuits, those using digital ICs, also need their power supply to be regulated.  5
  • 6. Elements of a Power Supply  Transformer  Rectifier  Capacitor  Regulator 6
  • 7. TRANSFORMER  The AC line voltage available for commercial purpose is not suitable for electronic circuits.  Most of the electronic circuits require a considerably lower voltage 7
  • 8. Contd…..  The transformer is a device used to convert the ac line voltage to a voltage level more appropriate to the needs of the circuit to be operated  At the same time, the transformer provides electrical isolation between the ac line and the circuit to be operated.  This is an important safety consideration. 8
  • 9. Contd….  The output of the transformer is still an ac voltage, but now of an appropriate magnitude for the circuit to be powered.  9
  • 10. Rectifiers  Rectifier is a device which convert AC voltage in to pulsating DC  A rectifier utilizes unidirectional conducting device Ex : P-N junction diodes 10
  • 11. Filter CircuitsFilter Circuits  The output from the rectifier section is a pulsating DC.  The filter circuit reduces the peak-to-peak pulses to a small ripple voltage. 1111 11
  • 12. Regulator  It converts pulses dc coming from capacitor into straight line dc 12
  • 13. Block diagram of a Power Supply 13
  • 15. Application  DC power is widely used in low voltage applications such as charging batteries, automotive applications, aircraft applications and other low voltage, low current applications. All solar panels nowadays produce DC power.  Common applications with DC power in the PV industry are portable solar systems and other off- grid appliances. Not using a solar inverter to convert DC to AC will keep the costs down for such systems. 15