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In dc choppers, per unit ripple is maximum when duty cycle α is
- a)0.9
- b)0.7
- c)0.5
- d)0.2
Correct answer is option 'C'. Can you explain this answer?
Verified Answer
In dc choppers, per unit ripple is maximum when duty cycle α isa...
The minimum turn-ON time of the SCR is = 
For step down chopper, Vo = δ VS
(Vo )min = 50 π V
For step down chopper, Vo = δ VS
(Vo )min = 50 π V
Most Upvoted Answer
In dc choppers, per unit ripple is maximum when duty cycle α isa...
Is 50%.
Explanation:
DC chopper is a type of power electronic circuit that converts a fixed DC voltage into a variable DC voltage. The output voltage of a DC chopper is controlled by varying the duty cycle of the chopper. The duty cycle is defined as the ratio of ON time to the total switching period.
When the duty cycle of the chopper is 50%, the ON time and OFF time of the switch are equal. This results in a maximum ripple in the output voltage. The ripple voltage is the difference between the maximum and minimum voltage values of the output waveform.
As the duty cycle of the chopper deviates from 50%, the ripple voltage decreases. When the duty cycle is either very low or very high, the output voltage becomes more or less constant, respectively, resulting in a negligible ripple.
Therefore, to minimize the ripple voltage in a DC chopper, we need to adjust the duty cycle away from 50% towards either very low or very high values.
Explanation:
DC chopper is a type of power electronic circuit that converts a fixed DC voltage into a variable DC voltage. The output voltage of a DC chopper is controlled by varying the duty cycle of the chopper. The duty cycle is defined as the ratio of ON time to the total switching period.
When the duty cycle of the chopper is 50%, the ON time and OFF time of the switch are equal. This results in a maximum ripple in the output voltage. The ripple voltage is the difference between the maximum and minimum voltage values of the output waveform.
As the duty cycle of the chopper deviates from 50%, the ripple voltage decreases. When the duty cycle is either very low or very high, the output voltage becomes more or less constant, respectively, resulting in a negligible ripple.
Therefore, to minimize the ripple voltage in a DC chopper, we need to adjust the duty cycle away from 50% towards either very low or very high values.
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