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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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In a single Phase full converter with resistive load and firing angle ...
The firing angle is the angle at which the thyristors in the full converter are triggered to conduct current. It determines the amount of power delivered to the resistive load.
In a single-phase full converter with a resistive load, the thyristors are triggered to conduct current for a portion of each half-cycle of the input voltage waveform. The firing angle is measured from the point where the input voltage crosses zero to the point where the thyristors are triggered.
At zero firing angle (0 degrees), the thyristors are triggered immediately as the input voltage crosses zero, resulting in full power being delivered to the load. As the firing angle is increased, the thyristors are triggered later in each half-cycle, reducing the amount of power delivered to the load.
At a firing angle of 180 degrees, the thyristors are triggered at the peak of the input voltage waveform, resulting in no power being delivered to the load. This is known as the "off" state.
The firing angle can be adjusted to control the power output of the full converter. By increasing the firing angle, the average power delivered to the load can be reduced, while decreasing the firing angle increases the power output.
It is important to note that in a single-phase full converter, the output voltage waveform will be distorted due to the presence of harmonics. This can result in a non-sinusoidal load current waveform and can cause additional losses in the system.
In a single-phase full converter with a resistive load, the thyristors are triggered to conduct current for a portion of each half-cycle of the input voltage waveform. The firing angle is measured from the point where the input voltage crosses zero to the point where the thyristors are triggered.
At zero firing angle (0 degrees), the thyristors are triggered immediately as the input voltage crosses zero, resulting in full power being delivered to the load. As the firing angle is increased, the thyristors are triggered later in each half-cycle, reducing the amount of power delivered to the load.
At a firing angle of 180 degrees, the thyristors are triggered at the peak of the input voltage waveform, resulting in no power being delivered to the load. This is known as the "off" state.
The firing angle can be adjusted to control the power output of the full converter. By increasing the firing angle, the average power delivered to the load can be reduced, while decreasing the firing angle increases the power output.
It is important to note that in a single-phase full converter, the output voltage waveform will be distorted due to the presence of harmonics. This can result in a non-sinusoidal load current waveform and can cause additional losses in the system.
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In a single Phase full converter with resistive load and firing angle ...
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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