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In a semi converter feeding a resistive load, the firing angle is
a
. Each thyristor conducts for- a)pradians
- b)(p-a) radians
- c)(p+a) radians
- d)(p- 0.5a) radians
Correct answer is option 'B'. Can you explain this answer?
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In a semi converter feeding a resistive load, the firing angle is a. E...
The conduction is from
a
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In a semi converter feeding a resistive load, the firing angle is a. E...
Answer:
In a semi converter, the firing angle determines the delay between the triggering of the thyristors and the conduction of current through them. This firing angle is denoted by 'a'.
Thyristor Conduction:
During conduction, the current flows through one of the thyristors. In a semi converter, there are two thyristors, and each conducts for a specific duration during a cycle. The duration for which the thyristor conducts is given by:
Conduction time = (1 - a/π) * T
Where T is the time period of the input waveform.
Firing Angle:
The firing angle determines the delay in the triggering of the thyristors. For a resistive load, the thyristors are triggered at certain points during the input waveform to control the power delivered to the load. The firing angle 'a' represents the delay in triggering the thyristors.
Calculation:
Since there are two thyristors in a semi converter, the first thyristor conducts for the duration of (1 - a/π) * T.
For the second thyristor to conduct, the first thyristor should stop conducting. The time taken for this transition is equal to the duration for which the first thyristor conducts.
Hence, the second thyristor starts conducting after the first thyristor stops conducting completely. Therefore, the firing angle for the second thyristor is given by:
Firing angle for second thyristor = π - (1 - a/π) * π
= π - (π - a)
= a
Therefore, the firing angle for the second thyristor is (π - a) radians.
Hence, the correct answer is option 'B': (π - a) radians.
In a semi converter, the firing angle determines the delay between the triggering of the thyristors and the conduction of current through them. This firing angle is denoted by 'a'.
Thyristor Conduction:
During conduction, the current flows through one of the thyristors. In a semi converter, there are two thyristors, and each conducts for a specific duration during a cycle. The duration for which the thyristor conducts is given by:
Conduction time = (1 - a/π) * T
Where T is the time period of the input waveform.
Firing Angle:
The firing angle determines the delay in the triggering of the thyristors. For a resistive load, the thyristors are triggered at certain points during the input waveform to control the power delivered to the load. The firing angle 'a' represents the delay in triggering the thyristors.
Calculation:
Since there are two thyristors in a semi converter, the first thyristor conducts for the duration of (1 - a/π) * T.
For the second thyristor to conduct, the first thyristor should stop conducting. The time taken for this transition is equal to the duration for which the first thyristor conducts.
Hence, the second thyristor starts conducting after the first thyristor stops conducting completely. Therefore, the firing angle for the second thyristor is given by:
Firing angle for second thyristor = π - (1 - a/π) * π
= π - (π - a)
= a
Therefore, the firing angle for the second thyristor is (π - a) radians.
Hence, the correct answer is option 'B': (π - a) radians.
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In a semi converter feeding a resistive load, the firing angle is a. Each thyristor conducts fora)p radiansb)(p - a) radiansc)(p + a) radiansd)(p - 0.5 a) radiansCorrect answer is option 'B'. Can you explain this answer?
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