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di/dt protection is provided to the thryistor by
- a)connecting an inductor in parallel across the load
- b)connecting an inductor in series with the load
- c)connecting an inductor in parallel across the gate terminal
- d)connecting an inductor in series with the gate
Correct answer is option 'B'. Can you explain this answer?
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Verified Answer
di/dt protection is provided to the thryistor bya)connecting an induct...
By placing the di/dt inductor (L) in series with the load, the change in the anode current can be limited to a small value.
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di/dt protection is provided to the thryistor bya)connecting an induct...
Explanation:
When it comes to protecting a thyristor from di/dt (rate of change of current) stress, connecting an inductor in series with the load is the most effective method. This method is commonly known as series inductance protection.
Why is series inductance protection required?
Thyristors are highly sensitive devices and can be damaged by high di/dt values. Di/dt is the rate at which the current through the thyristor changes. When the di/dt value is too high, it can cause excessive voltage across the thyristor, leading to voltage spikes and potential damage. Therefore, it is necessary to limit the di/dt to safe levels to protect the thyristor.
Working principle of series inductance protection:
By connecting an inductor in series with the load, the inductor opposes any sudden change in current, acting as a current-limiting device. When the load current changes rapidly, the inductor generates a back-emf (electromotive force) to counteract the change. This back-emf restricts the rate of change of current, thus reducing the di/dt stress on the thyristor.
Advantages of series inductance protection:
1. Limiting di/dt: The series inductor effectively limits the rate of change of current, protecting the thyristor from high di/dt stress.
2. Voltage spike suppression: When the inductor opposes the change in current, it also helps in suppressing voltage spikes that may occur due to rapid current changes.
3. Cost-effective: Series inductance protection is a simple and cost-effective method compared to other protection techniques like snubber circuits.
4. Easy implementation: Connecting an inductor in series with the load is straightforward and can be easily implemented in the circuit.
Conclusion:
To protect a thyristor from di/dt stress, connecting an inductor in series with the load is the most suitable method. The inductor limits the rate of change of current, protecting the thyristor from potential damage. This series inductance protection technique is widely used in various applications to ensure the reliable operation of thyristors.
When it comes to protecting a thyristor from di/dt (rate of change of current) stress, connecting an inductor in series with the load is the most effective method. This method is commonly known as series inductance protection.
Why is series inductance protection required?
Thyristors are highly sensitive devices and can be damaged by high di/dt values. Di/dt is the rate at which the current through the thyristor changes. When the di/dt value is too high, it can cause excessive voltage across the thyristor, leading to voltage spikes and potential damage. Therefore, it is necessary to limit the di/dt to safe levels to protect the thyristor.
Working principle of series inductance protection:
By connecting an inductor in series with the load, the inductor opposes any sudden change in current, acting as a current-limiting device. When the load current changes rapidly, the inductor generates a back-emf (electromotive force) to counteract the change. This back-emf restricts the rate of change of current, thus reducing the di/dt stress on the thyristor.
Advantages of series inductance protection:
1. Limiting di/dt: The series inductor effectively limits the rate of change of current, protecting the thyristor from high di/dt stress.
2. Voltage spike suppression: When the inductor opposes the change in current, it also helps in suppressing voltage spikes that may occur due to rapid current changes.
3. Cost-effective: Series inductance protection is a simple and cost-effective method compared to other protection techniques like snubber circuits.
4. Easy implementation: Connecting an inductor in series with the load is straightforward and can be easily implemented in the circuit.
Conclusion:
To protect a thyristor from di/dt stress, connecting an inductor in series with the load is the most suitable method. The inductor limits the rate of change of current, protecting the thyristor from potential damage. This series inductance protection technique is widely used in various applications to ensure the reliable operation of thyristors.
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di/dt protection is provided to the thryistor bya)connecting an inductor in parallel across the loadb)connecting an inductor in series with the loadc)connecting an inductor in parallel across the gate terminald)connecting an inductor in series with the gateCorrect answer is option 'B'. Can you explain this answer?
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