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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...
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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Community Answer
A dc chopper is fed from constant voltage mains. The duty ratio &alpha...
Of the chopper is given by the equation:
D = Vout / Vin
where:
D = Duty ratio of the chopper
Vout = Output voltage of the chopper
Vin = Input voltage from the constant voltage mains
The duty ratio represents the ratio of the ON time to the total switching period of the chopper. It determines the average output voltage of the chopper.
By varying the duty ratio, the output voltage of the chopper can be controlled. A higher duty ratio will result in a higher output voltage, while a lower duty ratio will result in a lower output voltage.
It is important to note that the duty ratio cannot exceed 1, as this would mean the chopper is always ON and would result in a constant output voltage equal to the input voltage. Similarly, the duty ratio cannot be less than 0, as this would mean the chopper is always OFF and there would be no output voltage.
In summary, the duty ratio of a dc chopper fed from constant voltage mains is an important parameter that determines the output voltage of the chopper.
D = Vout / Vin
where:
D = Duty ratio of the chopper
Vout = Output voltage of the chopper
Vin = Input voltage from the constant voltage mains
The duty ratio represents the ratio of the ON time to the total switching period of the chopper. It determines the average output voltage of the chopper.
By varying the duty ratio, the output voltage of the chopper can be controlled. A higher duty ratio will result in a higher output voltage, while a lower duty ratio will result in a lower output voltage.
It is important to note that the duty ratio cannot exceed 1, as this would mean the chopper is always ON and would result in a constant output voltage equal to the input voltage. Similarly, the duty ratio cannot be less than 0, as this would mean the chopper is always OFF and there would be no output voltage.
In summary, the duty ratio of a dc chopper fed from constant voltage mains is an important parameter that determines the output voltage of the chopper.
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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?.
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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