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The gate-cathode characteristic of an SCR is given by V = 0.5 + 81. For a triggering frequency of 400 Hz and duty cycle of 0.1, compute the value of resistance to be connected in series with the gate circuit. The rectangular trigger pulse applied to the gate circuit has an amplitude of 12 V. The thyristor has average gate-power loss of 0.5 watts.?
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The gate-cathode characteristic of an SCR is given by V = 0.5 + 81. Fo...
Given Data
- Triggering Frequency: 400 Hz
- Duty Cycle: 0.1
- Trigger Pulse Amplitude: 12 V
- Average Gate Power Loss: 0.5 W
- SCR Gate-Cathode Characteristic: V = 0.5 + 81
Calculation of the Gate Current
1. First, we can determine the average power delivered to the gate:
- Power (P) = Voltage (V) × Current (I)
- Rearranging gives us:
- I = P / V
2. The voltage across the gate can be derived from the characteristic equation:
- V = 0.5 + 81 = 81.5 V
3. Using the average gate power loss:
- I = 0.5 W / 81.5 V
- I ≈ 0.00614 A (or 6.14 mA)
Calculating the Trigger Pulse Duration
1. The duty cycle of 0.1 implies that the pulse is active 10% of the time:
- Pulse Duration = Duty Cycle × Period
- Period = 1 / Frequency = 1 / 400 = 0.0025 s
- Pulse Duration = 0.1 × 0.0025 s = 0.00025 s (or 250 µs)
Calculating the Required Resistance
1. Using Ohm’s law (V = IR), we can find the resistance (R):
- R = (V_gate - V_trigger) / I
- Here, V_gate = 12 V and V_trigger = 81.5 V, thus:
- R = (12 V - 81.5 V) / 0.00614 A
- R = (-69.5 V) / 0.00614 A ≈ -11,318.2 Ω
2. Since resistance cannot be negative, this suggests that adjustments are needed in the design or assumptions about the SCR characteristics.
Conclusion
The calculated resistance indicates that a re-evaluation of the parameters or circuit design might be necessary to ensure proper triggering of the SCR.
- Triggering Frequency: 400 Hz
- Duty Cycle: 0.1
- Trigger Pulse Amplitude: 12 V
- Average Gate Power Loss: 0.5 W
- SCR Gate-Cathode Characteristic: V = 0.5 + 81
Calculation of the Gate Current
1. First, we can determine the average power delivered to the gate:
- Power (P) = Voltage (V) × Current (I)
- Rearranging gives us:
- I = P / V
2. The voltage across the gate can be derived from the characteristic equation:
- V = 0.5 + 81 = 81.5 V
3. Using the average gate power loss:
- I = 0.5 W / 81.5 V
- I ≈ 0.00614 A (or 6.14 mA)
Calculating the Trigger Pulse Duration
1. The duty cycle of 0.1 implies that the pulse is active 10% of the time:
- Pulse Duration = Duty Cycle × Period
- Period = 1 / Frequency = 1 / 400 = 0.0025 s
- Pulse Duration = 0.1 × 0.0025 s = 0.00025 s (or 250 µs)
Calculating the Required Resistance
1. Using Ohm’s law (V = IR), we can find the resistance (R):
- R = (V_gate - V_trigger) / I
- Here, V_gate = 12 V and V_trigger = 81.5 V, thus:
- R = (12 V - 81.5 V) / 0.00614 A
- R = (-69.5 V) / 0.00614 A ≈ -11,318.2 Ω
2. Since resistance cannot be negative, this suggests that adjustments are needed in the design or assumptions about the SCR characteristics.
Conclusion
The calculated resistance indicates that a re-evaluation of the parameters or circuit design might be necessary to ensure proper triggering of the SCR.
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The gate-cathode characteristic of an SCR is given by V = 0.5 + 81. For a triggering frequency of 400 Hz and duty cycle of 0.1, compute the value of resistance to be connected in series with the gate circuit. The rectangular trigger pulse applied to the gate circuit has an amplitude of 12 V. The thyristor has average gate-power loss of 0.5 watts.?
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The gate-cathode characteristic of an SCR is given by V = 0.5 + 81. For a triggering frequency of 400 Hz and duty cycle of 0.1, compute the value of resistance to be connected in series with the gate circuit. The rectangular trigger pulse applied to the gate circuit has an amplitude of 12 V. The thyristor has average gate-power loss of 0.5 watts.? for UPSC 2024 is part of UPSC preparation. The Question and answers have been prepared according to the UPSC exam syllabus. Information about The gate-cathode characteristic of an SCR is given by V = 0.5 + 81. For a triggering frequency of 400 Hz and duty cycle of 0.1, compute the value of resistance to be connected in series with the gate circuit. The rectangular trigger pulse applied to the gate circuit has an amplitude of 12 V. The thyristor has average gate-power loss of 0.5 watts.? covers all topics & solutions for UPSC 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for The gate-cathode characteristic of an SCR is given by V = 0.5 + 81. For a triggering frequency of 400 Hz and duty cycle of 0.1, compute the value of resistance to be connected in series with the gate circuit. The rectangular trigger pulse applied to the gate circuit has an amplitude of 12 V. The thyristor has average gate-power loss of 0.5 watts.?.
The gate-cathode characteristic of an SCR is given by V = 0.5 + 81. For a triggering frequency of 400 Hz and duty cycle of 0.1, compute the value of resistance to be connected in series with the gate circuit. The rectangular trigger pulse applied to the gate circuit has an amplitude of 12 V. The thyristor has average gate-power loss of 0.5 watts.? for UPSC 2024 is part of UPSC preparation. The Question and answers have been prepared according to the UPSC exam syllabus. Information about The gate-cathode characteristic of an SCR is given by V = 0.5 + 81. For a triggering frequency of 400 Hz and duty cycle of 0.1, compute the value of resistance to be connected in series with the gate circuit. The rectangular trigger pulse applied to the gate circuit has an amplitude of 12 V. The thyristor has average gate-power loss of 0.5 watts.? covers all topics & solutions for UPSC 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for The gate-cathode characteristic of an SCR is given by V = 0.5 + 81. For a triggering frequency of 400 Hz and duty cycle of 0.1, compute the value of resistance to be connected in series with the gate circuit. The rectangular trigger pulse applied to the gate circuit has an amplitude of 12 V. The thyristor has average gate-power loss of 0.5 watts.?.
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The gate-cathode characteristic of an SCR is given by V = 0.5 + 81. For a triggering frequency of 400 Hz and duty cycle of 0.1, compute the value of resistance to be connected in series with the gate circuit. The rectangular trigger pulse applied to the gate circuit has an amplitude of 12 V. The thyristor has average gate-power loss of 0.5 watts.?, a detailed solution for The gate-cathode characteristic of an SCR is given by V = 0.5 + 81. For a triggering frequency of 400 Hz and duty cycle of 0.1, compute the value of resistance to be connected in series with the gate circuit. The rectangular trigger pulse applied to the gate circuit has an amplitude of 12 V. The thyristor has average gate-power loss of 0.5 watts.? has been provided alongside types of The gate-cathode characteristic of an SCR is given by V = 0.5 + 81. For a triggering frequency of 400 Hz and duty cycle of 0.1, compute the value of resistance to be connected in series with the gate circuit. The rectangular trigger pulse applied to the gate circuit has an amplitude of 12 V. The thyristor has average gate-power loss of 0.5 watts.? theory, EduRev gives you an
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