Ripple frequency of three phase half bridge converter

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SUMMARY

The ripple frequency of a three-phase half-controlled bridge rectifier is determined by the number of output pulses, which can be either 3 or 6, depending on the firing angle. The correct answer is that the ripple frequency is 3 times the input frequency when considering the configuration of the rectifier. This conclusion is based on the understanding that a half-controlled bridge rectifier produces three pulses per cycle when configured correctly. The discussion emphasizes the importance of the rectifier's configuration and the reference point for output voltage.

PREREQUISITES
  • Understanding of three-phase electrical systems
  • Knowledge of half-controlled bridge rectifiers
  • Familiarity with ripple frequency concepts
  • Basic principles of phase reference in electrical circuits
NEXT STEPS
  • Study the operation of three-phase half-controlled bridge rectifiers
  • Learn about ripple frequency calculations in power electronics
  • Examine the effects of firing angles on output waveforms
  • Explore the differences between half-wave and full-wave rectification
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Electrical engineering students, power electronics professionals, and anyone involved in designing or analyzing three-phase rectifier circuits.

jaus tail
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Homework Statement


upload_2018-2-8_15-32-29.png


Homework Equations


Three phase half controlled bridge rectifier can have 3 pules at output or 6 pulses depending on firing angle.

The Attempt at a Solution


Ripple frequency is m times the input frequency where m is number of pulses.
It can be 3 or 6. So why have they marked A as right answer? I think there can be two right answers.
 

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If “half-controlled” meant half wave rectification, then the answer is (A)3 times.
If “half-controlled” meant full wave with only say a diode below and a controlled rectifier above then the reference output would be the lowest voltage from the diodes and the output would be the controlled phase making three per cycle so the answer would still be (A)3 times.
But all things are relative.
If the three phase transformer is not centre tapped with the neutral acting as the reference, the diodes would produce the half wave reference, not output pulses.
 
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