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A dc chopper is fed from constant voltage mains. The duty ratio α of the chopper is progressively increased while the chopper feeds RL load. The per unit current ripple would
- a)Increase progressively.
- b)Decrease progressively.
- c)Decrease to a minimum value at α = 0.5 and then increase.
- d)Increase to a maximum value at α = 0.5 and then decrease.
Correct answer is option 'D'. Can you explain this answer?
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A dc chopper is fed from constant voltage mains. The duty ratio &alpha...
Per unit current ripple in a DC chopper with RL load:
Explanation:
- As the duty ratio α of the chopper is progressively increased, the current ripple in the load will also increase.
- At α = 0, the chopper is in the off state, resulting in maximum current ripple.
- As α is increased from 0 towards 0.5, the current ripple decreases gradually due to the increase in the average value of the output voltage.
- At α = 0.5, the current ripple reaches a minimum value because the average output voltage is half of the input voltage, resulting in a smoother current waveform.
- After α = 0.5, the current ripple starts to increase again as the duty ratio is further increased towards 1.
- Therefore, the per unit current ripple in a DC chopper with RL load would increase to a maximum value at α = 0.5 and then decrease.
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A dc chopper is fed from constant voltage mains. The duty ratio &alpha...
Ripple current in the chopper circuit :
Ripple current is the difference between maximum current (Imx) and minimum current (Imin) flowing through the chopper circuit in the steady-state operation of the chopper.
The ripple current of chopper operating in steady-state is given by
Where
α = duty cycle of the chopper, Vs = DC supply voltage, R = load resistance, Ta = time constant = L/R , and T = time period of the chopper
From the above equation, we can observe per unit ripple current is only depends on the time constant (Ta), Time period (T), and duty cycle (α ).
Variation of ripple current with a duty cycle (α) and T/Ta ratio:
We can observe the variation of ripple current with duty cycle and T/Ta ration in the figure is shown below,
Ripple current is the difference between maximum current (Imx) and minimum current (Imin) flowing through the chopper circuit in the steady-state operation of the chopper.
The ripple current of chopper operating in steady-state is given by
Where
α = duty cycle of the chopper, Vs = DC supply voltage, R = load resistance, Ta = time constant = L/R , and T = time period of the chopper
From the above equation, we can observe per unit ripple current is only depends on the time constant (Ta), Time period (T), and duty cycle (α ).
Variation of ripple current with a duty cycle (α) and T/Ta ratio:
We can observe the variation of ripple current with duty cycle and T/Ta ration in the figure is shown below,
- From the above graph, the value of ripple current is increased with an increasing duty cycle (α) up to some instant where the value of α =0.5, and after that, it is decreasing.
- The maximum value of ripple current is given at the value of α = 0.5
- The maximum value of the ripple current is increased with increasing T/Ta ratio but still, the max ripple current occurs at α = 0.5.
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A dc chopper is fed from constant voltage mains. The duty ratio α of the chopper is progressively increased while the chopper feeds RL load. The per unit current ripple woulda)Increase progressively.b)Decrease progressively.c)Decrease to a minimum value at α = 0.5 and then increase.d)Increase to a maximum value at α = 0.5 and then decrease.Correct answer is option 'D'. Can you explain this answer?
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A dc chopper is fed from constant voltage mains. The duty ratio α of the chopper is progressively increased while the chopper feeds RL load. The per unit current ripple woulda)Increase progressively.b)Decrease progressively.c)Decrease to a minimum value at α = 0.5 and then increase.d)Increase to a maximum value at α = 0.5 and then decrease.Correct answer is option 'D'. Can you explain this answer? for Electrical Engineering (EE) 2024 is part of Electrical Engineering (EE) preparation. The Question and answers have been prepared according to the Electrical Engineering (EE) exam syllabus. Information about A dc chopper is fed from constant voltage mains. The duty ratio α of the chopper is progressively increased while the chopper feeds RL load. The per unit current ripple woulda)Increase progressively.b)Decrease progressively.c)Decrease to a minimum value at α = 0.5 and then increase.d)Increase to a maximum value at α = 0.5 and then decrease.Correct answer is option 'D'. Can you explain this answer? covers all topics & solutions for Electrical Engineering (EE) 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for A dc chopper is fed from constant voltage mains. The duty ratio α of the chopper is progressively increased while the chopper feeds RL load. The per unit current ripple woulda)Increase progressively.b)Decrease progressively.c)Decrease to a minimum value at α = 0.5 and then increase.d)Increase to a maximum value at α = 0.5 and then decrease.Correct answer is option 'D'. Can you explain this answer?.
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