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Power Supply Project


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Power Supply Project

  1. 1. Powerpoint Templates Page 1
  2. 2. Fixed Regulated DC Power Supply of 15 V @ 800 mA Syed Asad Abbas Touqeer Ahmed Usman Aslam Usman Hadi Zaid Pitafi Powerpoint Templates Page 2
  3. 3. Steps Involved in making a Power SupplyTransformer Rectifier Filtering Regulator Block Diagram Powerpoint Templates Page 3
  4. 4. Block Diagram Block Diagram Powerpoint Templates Page 4
  5. 5. Powerpoint Templates Page 5
  6. 6. Transformer Block DiagramTransformer : A step-down transformer is used to reduce the dangerously high mains voltage to a safer level In Our power supply the output of the transformer is an AC stepped down to 15 V. Powerpoint Templates Page 6
  7. 7. Block Diagram Bridge Rectifier Converts the AC voltage to DC Available in the form of packages of combination of four diodes forming a bridge Bridge rectifier and output is obtained from the corner positive and negatively marked terminals Powerpoint Templates Page 7
  8. 8. Block Diagram Filtering Filtering is technique in which a pure DC is obtained The output of a bridge rectifier is not a pure DC and needs to be converted into pure form A capacitive circuit is used as a filter or a smoother It converts the pulsating DC into a pure DC with a little ripples. Powerpoint Templates Page 8
  9. 9. Block Regulator Diagram Eliminates ripple by setting DC output to a fixed voltage Voltage regulator ICs are available with fixed (typically 5, 12 and 15V) or variable output voltages Each regulator has its own data sheet and pin configuration LM 7815 and 7915 were used in our supply. Powerpoint Templates Page 9
  10. 10. 15V DC power supply (steps) Circuit Purchasing Bread board SimulationDesigning components testing Altium DesignSoldering Drilling Etching Lamination Testing Powerpoint Templates Page 10
  11. 11. 15 V DC power supply Circuit DesigningDesigning a circuitSimulating the circuit in any of the friendly interfaced simulating software.The software used by us was Multisim . Powerpoint Templates Page 11
  12. 12. Simulation U1 LM7815CT 11 LINE VREG XSC1 VOLTAGE COMMON V1 Ext T rig + 13 8 15 Vrms C1 C3 _ A B 50 Hz 2 D1 4.7mF 2.2mF + _ + _ 0° 4 1 09 V2 3 1B4B42 C4 15 Vrms C2 2.2mF 50 Hz 4.7mF COMMON 0° 6 VOLTAGE 7 VREG LINE 12 U2 LM7915CT It resulted in a pure waveform in which remaining ripples were also eliminated Powerpoint Templates Page 12
  13. 13. 15 V DC power supply SIMULATED CIRCUIT U1 LM7815CT R1 1 LINE VREG 9 6 VOLTAGE 8 1kΩ COMMON V1 15 Vrms C1 C3 LED1 50 Hz 2 D1 4.7mF 2.2mF 0° 0 4 1 2 V2 3 1B4B42 C4 15 Vrms C2 2.2mF 4.7mF LED2 50 Hz COMMON 0° 12 10 R2 VOLTAGE 4 VREG LINE 3 U2 1kΩ LM7915CT • Whole of the circuit was simulated which shows various stages of regulation of 15 Volts DC Powerpoint Templates Page 13
  14. 14. 15 V DC power supply Components Purchased  A list of components purchased NO. COMPONENTS SPECIFICATIONS QUANTITY 1 Transformer 15x2 Volts 1 2 Bridge Rectifier 2 Ampere 1 3 Capacitor 4700uF 2 4 Voltage Regulator LM 7815 1 5 Voltage Regulator LM 7915 1 6 Capacitor 2200uF 2 7 Resistance 1 kilo ohm 2 8 Light Emitting Diodes (LEDs) 2 Powerpoint Templates Page 14
  15. 15. 15 V DC power supply • Bread Board Testing For testing the circuit, a step by step procedure was adopted as was done in simulation. And in each step the functionality was checked using Cathode Ray Oscilloscope and also a Digital Multimeter (DMM). • 1. First of all, a wire and a plug were connected to the wires of transformer primary. The transformer output was measured using DMM. It is a step down transformer and provides an output of 15 Volts at its output. • 2. The transformer AC output of 15 Volts was converted to DC using a bridge rectifier. • 3. The ripples of positive DC output were removed by connecting a capacitor of 4700 µF in parallel with the bridge rectifier side which provides positive output voltage. • 4. For regulating this filtered voltage at +15 Volts a voltage regulator, LM-7815 was connected across the capacitor (in series or in parallel). Powerpoint Templates Page 15
  16. 16. 5. Any ripples remaining in this regulated voltage were then removed using another filter capacitor of worth 2200 µF connected in parallel with this circuit. 6. The output was now a regulated DC voltage of +15 Volts as was the requirement of our supply design.7. The same procedure was repeated for the regulation of -15 Volts. In itsregulation voltage regulator LM 7915 was used.8. To check the functionality of the circuit LEDs were connected acrossthe circuit with the help of two series resistors of 1kΩ.• Green LED for -15 Volts• Red LED for +15 Volts Powerpoint Templates Page 16
  17. 17. Powerpoint Templates Page 17
  18. 18. Altium Design OBJECTIVES Powerpoint Templates Page 18
  19. 19. Powerpoint Templates Page 19
  20. 20. CON_IN 1 2 3 done 4 2 C A C A 3 1 - V + V G N Br_Rectifier D 4 C 4 C 7 7 2 1 0 0 0 0 u u 1 2 U 1 I N U 2 I 2 N G N 1 G LM7915 LM7815 D N O D U O T U T 3 3 Powerpoint Templates Schematic 2 Cap Pol1 C 2 Cap Pol1 C 2 2 4 3 0 0 0 0 u u 5 Res2 R(load) 0 5 Res2 R(load)1 0 L L E E D D 2 1 corresponding to which the PCB simulation is  The schematic in Altium Design Suite is madePage 20
  21. 21. PCB Design circuit Corresponding to the Schematic a PCB simulated circuit is obtained Powerpoint Templates Page 21
  22. 22. RoutingProcess in which the tracks are created in the Design and the length and thickness of these tracks can be altered according to the requirementThe print of this design is taken on a sticker paper. Powerpoint Templates Page 22
  23. 23. Powerpoint Templates Page 23
  24. 24. 15 V DC power supply Print On Sticker Sheet  The print of the routed PCB is taken on a sticker paper so that it could be pasted on the copper board Powerpoint Templates Page 24
  25. 25. Lamination 15 V DC power supply This is the process in which the print of the PCB taken on a sticker sheet using a laser printer is transferred to the copper board. Powerpoint Templates Page 25
  26. 26. Powerpoint Templates Page 26
  27. 27. We used an alternate procedure of ironing theprinted sticker sheet over the copper boardIn this process the sticker sheet was ironed over the copper board and after sometime it was observed that the print was imprinted over the copper board Powerpoint Templates Page 27
  28. 28. Etching ETCHED TANK PA 310 Etching is a chemical process in which the copper (extra) is removed from the copper board resulting in a PCB to be Drilled An Etched PCB Powerpoint Templates Page 28
  29. 29. Etching (continued) 15 Vsupply DC power The etching process depends upon the chemical used mostly it is an acid The acid is heated to particular temperature then it is maintained For this purpose a machine known as PCB etch tank is used The Copper board is placed in the heated acid for about 2 minutes This process also depends on the quality of the chemical used If the chemical used is old it might take a long time Powerpoint Templates Page 29
  30. 30. Drilling 15 V DC power supply Process in which holes are drilled at the appropriate places for the components to be soldered This process is carried out using a drill machine It can be manually drilled as in our case Powerpoint Templates Page 30
  31. 31. Soldering 15 V DC power supply Place the PCB, with its components, in steady position when soldering iron is to be used The heated soldering iron should then be placed in contact with the PCB and the component and allowed to heat them up. Once they are heated the solder can be applied. The solder should flow through and around the component and the track of PCB Powerpoint Templates Page 31
  32. 32. Testing of PCB 15 V DC power supplyFinally the PCB was tested Connector connected to the output of the Transformer. Two glowing LEDs show that the PCB is working. Also the output voltage and current of the transformer were checked. Output seen on CRO for the final check. Powerpoint Templates Page 32
  33. 33. Powerpoint Templates Page 33