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POWER SUPPLY PRESENTED BY Prof. D. M. Parshuramkar

POWER SUPPLY PRESENTED BY Prof. D. M. Parshuramkar. A device convert ac power to dc power is called power supply. Type of power supply- There are two types of power supply: 1 . Unregulated power supply 2 . Regulated power supply.

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POWER SUPPLY PRESENTED BY Prof. D. M. Parshuramkar

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  1. POWER SUPPLYPRESENTED BYProf. D. M. Parshuramkar

  2. A device convert ac power to dc power is called power supply.Type of power supply-There are two types of power supply:1. Unregulated power supply2. Regulated power supply

  3. Parts of Regulated power supply1. Step down transformer2. Full wave rectifier3. Filter circuit4. Voltage regulating circuit

  4. Parts of Unregulated power supply1. Step down transformer2. Full wave rectifier3. Filter circuit

  5. RECTIFIER • Rectifier definition: • A rectifier is an electrical device that converts an Alternating Current (AC) into a Direct Current (DC) by using one or more P-N junction diodes.

  6. Output dc power Efficiency = -----------------------Input ac power

  7. Output ac voltage or currentRipple factor = --------------------------------- Output dc voltage or current

  8. TYPE OF RECTIFIER • Types of rectifiers • The rectifiers are mainly classified into two types: • Half wave rectifier • Full wave rectifier

  9. HALF WAVE RECTIFIER • As the name suggests, the half wave rectifier is a type of rectifier which converts half of the AC input signal (positive half cycle) into pulsating DC output signal and the remaining half signal (negative half cycle) is blocked or lost. In half wave rectifier circuit, we use only a single diode.

  10. HALF WAVE RECTIFIER

  11. IN HALF RECTIFIER • 1. Number of diodes required: 1 • 2. Transformer requirement: Not essential • 3. Average value of current, Idc: Imax/pi • 4. Rms value of current, Irms: Imax/2 • 5. Peak inverse voltage (PIV): Vmax • 6. Peak load current, Imax: Vmax/(Rload + Rf) • 7. Dc output voltage, Vdc: Idc x Rload • 8. Rectification efficiency (max): 40.6 % • 9. Ripple factor: 1.21 • 10. Fundamental frequency of ripple: f • 11. Voltage regulation: good • 12. Transformer utilization factor: 0.286 • 13. Form factor: 1.57 • 14. Peak factor: 2

  12. FULL WAVE RECTIFIER • The full wave rectifier is a type of rectifier which converts the full AC input signal (positive half cycle and negative half cycle) to pulsating DC output signal. Unlike the half wave rectifier, the input signal is not wasted in full wave rectifier. The efficiency of full wave rectifier is high as compared to the half wave rectifier.

  13. FULL WAVE RECTIFIER

  14. IN FULL RECTIFIER • . Number of diodes required: 2 • 2. Transformer requirement: Center tap • 3. Average value of current, Idc: 2Imax/pi • 4. Rms value of current, Irms: Imax/sqr root(2) • 5. Peak inverse voltage (PIV): 2Vmax • 6. Peak load current, Imax: Vmax/(Rload + Rf) • 7. Dc output voltage, Vdc: Idc x Rload • 8. Rectification efficiency (max): 81.2 % • 9. Ripple factor: 0.482 • 10. Fundamental frequency of ripple: 2f • 11. Voltage regulation: better • 12. Transformer utilization factor: 0.692 • 13. Form factor: 1.11 • 14. Peak factor: sqr root(2)

  15. BRIDGE RECTIFIER The Full Wave Bridge Rectifier Another type of circuit that produces the same output waveform as the full wave rectifier circuit above, is that of the Full Wave Bridge Rectifier. This type of single phase rectifier uses four individual rectifying diodes connected in a closed loop “bridge” configuration to produce the desired output.

  16. The Diode Bridge Rectifier

  17. IN BRIDGE RECTIFIER • 1. Number of diodes required: 4 • 2. Transformer requirement: Not essential • 3. Average value of current, Idc: 2Imax/pi • 4. Rms value of current, Irms: Imax/sqr root(2) • 5. Peak inverse voltage (PIV): Vmax • 6. Peak load current, Imax: Vmax/(Rload + 2Rf) • 7. Dc output voltage, Vdc: Idc x Rload • 8. Rectification efficiency (max): 81.2 % • 9. Ripple factor: 0.482 • 10. Fundamental frequency of ripple: 2f • 11. Voltage regulation: good • 12. Transformer utilization factor: 0.812 • 13. Form factor: 1.11 • 14. Peak factor: sqr root(2)

  18. FILTER CIRCUIT A filter circuit is a device to remove the A.C components of the rectified output, but allows the D.C components to reach the load. A filter circuit is in general a combination of inductor (L) and Capacitor (C) called LC filter circuit. A capacitor allows A.C only and inductor allows D.C only to pass.

  19. TYPE OF FILTER CIRCUIT • SEREIS INDUCTOR FILTER • SHUNT CAPACITOR FILTER • L-SECTION FILTER • Pi-SECTION FILTER

  20. Zener Diode Regulator

  21. THANK YOU

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