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POWER ELECTRONICS

POWER ELECTRONICS

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POWER ELECTRONICS

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  1. بسم الله الرحمن الرحيم The Islamic University of Gaza Faculty of Engineering Electrical Engineering Department POWER ELECTRONICS EELE 5450— Summer 2012 Instructor: Eng. Jalal Al Roumy Lecture 14

  2. Chapter Five Full-wave controller With Inductive Load In actual practice most loads have some amount of inductance. Motors, solenoids, transformers, and even some resistive heaters have inductive components as apart of their impedance. The effect of this reactance is that the rms-to-average-current ratio is lowered. Higher average current can be passed through the SCR. With an inductive load , current flow is maintained through the SCR even after the input voltage has reversed polarity and goes negative. The duration of this interval is determined bu the load power factor.

  3. Chapter Five Full-wave controller With Inductive Load

  4. Chapter Five Full-wave controller With Inductive Load

  5. Chapter Five Ө > φ

  6. Chapter Five Ө < φ

  7. Chapter Five Triggering by pulse train synchronization

  8. Chapter Five Motor application

  9. Chapter Five Zero Voltage Switching • The control of rms ac voltage to the load could also be • Achieved by changing the on and off periods of the ac • Input wave to the load. • There are basically two methods of control: • On-off control • Proportional control

  10. Zero Voltage Switching

  11. Synchronous tap changing If a small variation of ac output voltage is required , then the taps of a transformer would be changed by switching thyristors in the proper manner. End of Lecture