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In a single Phase full converter with resistive load and firing angle α. The load current is non-zero and zero, respectively for-
- a)π and π - α respectively
- b)α and π - α respectively
- c)π - α and α respectively
- d)π + α and α respectively
Correct answer is option 'C'. Can you explain this answer?
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Most Upvoted Answer
In a single Phase full converter with resistive load and firing angle ...
The firing angle in a single-phase full converter with a resistive load determines the delay in turning on the thyristors and controlling the output voltage.
The full converter consists of four thyristors connected in a bridge configuration. When the firing angle is set to zero, all four thyristors are triggered simultaneously at the beginning of each half-cycle of the input voltage waveform. This results in full-wave rectification of the input voltage, and the output voltage is equal to the input voltage.
However, when the firing angle is not zero, the thyristors are triggered with a delay, after the input voltage has already started its cycle. This delay causes a portion of the input voltage waveform to be blocked, resulting in a reduced output voltage. The firing angle determines the amount of waveform that is blocked and thus controls the average output voltage.
For example, if the firing angle is set to 30 degrees, the thyristors will be triggered 30 degrees after the start of each half-cycle of the input voltage waveform. This means that the first 30 degrees of the waveform will be blocked, resulting in a reduced average output voltage.
The firing angle can be adjusted using a control circuit that measures the output voltage and adjusts the triggering timing of the thyristors accordingly. By changing the firing angle, the output voltage can be controlled and varied as needed.
The full converter consists of four thyristors connected in a bridge configuration. When the firing angle is set to zero, all four thyristors are triggered simultaneously at the beginning of each half-cycle of the input voltage waveform. This results in full-wave rectification of the input voltage, and the output voltage is equal to the input voltage.
However, when the firing angle is not zero, the thyristors are triggered with a delay, after the input voltage has already started its cycle. This delay causes a portion of the input voltage waveform to be blocked, resulting in a reduced output voltage. The firing angle determines the amount of waveform that is blocked and thus controls the average output voltage.
For example, if the firing angle is set to 30 degrees, the thyristors will be triggered 30 degrees after the start of each half-cycle of the input voltage waveform. This means that the first 30 degrees of the waveform will be blocked, resulting in a reduced average output voltage.
The firing angle can be adjusted using a control circuit that measures the output voltage and adjusts the triggering timing of the thyristors accordingly. By changing the firing angle, the output voltage can be controlled and varied as needed.
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In a single Phase full converter with resistive load and firing angle ...
Concept:
Phase-controlled converters:
- It is a device which is used to convert A.C sinusoidal into D.C.
- In this the A.C input is fed from transformer stepdown side and then input is converted into D.C output.
- Here we are talking about single phase fully controlled converter.
Single phase full converter with resistive load:
- An A.C voltage source of Vs = Vmsin(wt) is connected.
- Four controlled thyristors and a resistive load is connected.
- Let Vo be the output voltage.
Working:
- Let thyristor T1 and T4 are triggered at a firing angle of 'α'.
- During the first cycle from '0 to π' the current starts flowing at firing 'αand flows through Vs→ T1→ RL→ T4→ Vs.
- During the second cycle from 'π→2π' the thyristor T2 and T3 are triggered at (π + α)
- The current flows through Vs→ T2→ RL→ T3→ Vs.
Current flowing through a resistive load will be
I = Vo/R
We can see from the above graph that the current will be zero from '0 to α' and the current will be non-zero from α to π.
So, the current will be non-zero and zero from 'π - α' and 'α' respectively.
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In a single Phase full converter with resistive load and firing angle α. The load current is non-zero and zero, respectively for-a)π and π - α respectivelyb)α and π - α respectivelyc)π - α and α respectivelyd)π + α and α respectivelyCorrect answer is option 'C'. Can you explain this answer?
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