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Neelain University Faculty of Engineering Third Class

Neelain University Faculty of Engineering Third Class. Electronic Circuits I Lecture 2 Lecturer: Nasreen Ahmed Mekki www. 2013. Full-wave rectifiers. There are two type of full wave rectifier circuits: Bridge rectifier. Center-tapped transformer. Bridge rectifier.

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Neelain University Faculty of Engineering Third Class

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  1. Neelain UniversityFaculty of EngineeringThird Class Electronic Circuits I Lecture 2 Lecturer: Nasreen Ahmed Mekki www. 2013

  2. Full-wave rectifiers • There are two type of full wave rectifier circuits: • Bridge rectifier. • Center-tapped transformer.

  3. Bridge rectifier

  4. Full-wave rectifier operation • During the period t = 0 to T/2 the polarity of the input is shown in fig. below and current flow through Diode D2 and D3 are conducting while D1 and D4 are in the “off” state.

  5. Conduction path for the positive region of vi.

  6. Conduction path for the nagativeregion of vi.

  7. Input and output wave form for full-wave rectifier

  8. V average • For ideal diode: • For Silicon • PIV for full-wave bridge rectifier

  9. Example • For the Full-wave rectifier circuit shown below, the Vr.m.sequal to 12v . Draw input and output and diode waveforms, and find the value of average for the load voltage and current.

  10. Solution

  11. Center-tapped transformer

  12. Network conditions for the positive region of vi. • During the positive portion of vi applied to the primary of the transformer, the network will appear as shown in Fig. below. D1 assumes the short-circuit equivalent and D2 the open-circuit equivalent

  13. Network conditions for the nagativeregion of vi. • During the negative portion of the input the network appears as shown in Fig. below, reversing the roles of the diodes but maintaining the same polarity for the voltage

  14. V average • For ideal diode • For Silicon diode • PIV for center-tapped transformer full-wave rectifier

  15. Example • For the Full-wave rectifier circuit shown below, the Vr.m.sequal to 12v . Draw input and output and diode waveforms, and find the value of average for the load voltage and current.

  16. Solution

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