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The value of capacitor C for dynamic equalising circuit of series connected thyristors is determined by
- a)forward characteristics of thyristors
- b)reverse recovery characteristics of thyristors
- c)both forward and reverse recovery characteristics of thyristors
- d)none of the above
Correct answer is option 'B'. Can you explain this answer?
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The value of capacitor C for dynamic equalising circuit of series conn...
Value of C is proportional to maximum difference between reverse charge of SCRs in series.
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The value of capacitor C for dynamic equalising circuit of series conn...
The value of capacitor C for the dynamic equalizing circuit of series-connected thyristors is determined by the reverse recovery characteristics of the thyristors.
Explanation:
When thyristors are connected in series, it is essential to ensure that the voltage across each thyristor is equal during the turn-off process. This is important to prevent reverse voltage breakdown and to ensure the proper functioning of the thyristors.
To achieve equal voltage sharing, a dynamic equalizing circuit is used, which consists of a capacitor C connected in parallel with each thyristor. The purpose of this capacitor is to provide a temporary discharge path for the reverse recovery current of the thyristor during turn-off.
The reverse recovery time of a thyristor is the time taken by the device to block the reverse recovery current after the forward current is interrupted. During this reverse recovery time, the thyristor behaves like a diode and conducts a reverse recovery current.
The value of the capacitor C is determined by the reverse recovery characteristics of the thyristors. This is because:
1. The reverse recovery current is an important parameter that determines the magnitude and duration of the discharge current through the equalizing capacitor. By selecting an appropriate value of the capacitor, the reverse recovery current can be effectively diverted, ensuring equal voltage sharing among the thyristors.
2. The reverse recovery time of the thyristor defines the duration for which the equalizing capacitor needs to discharge the reverse recovery current. A higher reverse recovery time requires a larger value of the capacitor to ensure proper equalization.
3. The reverse recovery charge, which is the integral of the reverse recovery current over time, also affects the value of the equalizing capacitor. A higher reverse recovery charge requires a larger capacitor to provide an adequate discharge path.
By considering the reverse recovery characteristics of the thyristors, the value of the equalizing capacitor can be determined to ensure proper voltage sharing and protection of the thyristors in series connected configurations.
Explanation:
When thyristors are connected in series, it is essential to ensure that the voltage across each thyristor is equal during the turn-off process. This is important to prevent reverse voltage breakdown and to ensure the proper functioning of the thyristors.
To achieve equal voltage sharing, a dynamic equalizing circuit is used, which consists of a capacitor C connected in parallel with each thyristor. The purpose of this capacitor is to provide a temporary discharge path for the reverse recovery current of the thyristor during turn-off.
The reverse recovery time of a thyristor is the time taken by the device to block the reverse recovery current after the forward current is interrupted. During this reverse recovery time, the thyristor behaves like a diode and conducts a reverse recovery current.
The value of the capacitor C is determined by the reverse recovery characteristics of the thyristors. This is because:
1. The reverse recovery current is an important parameter that determines the magnitude and duration of the discharge current through the equalizing capacitor. By selecting an appropriate value of the capacitor, the reverse recovery current can be effectively diverted, ensuring equal voltage sharing among the thyristors.
2. The reverse recovery time of the thyristor defines the duration for which the equalizing capacitor needs to discharge the reverse recovery current. A higher reverse recovery time requires a larger value of the capacitor to ensure proper equalization.
3. The reverse recovery charge, which is the integral of the reverse recovery current over time, also affects the value of the equalizing capacitor. A higher reverse recovery charge requires a larger capacitor to provide an adequate discharge path.
By considering the reverse recovery characteristics of the thyristors, the value of the equalizing capacitor can be determined to ensure proper voltage sharing and protection of the thyristors in series connected configurations.
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The value of capacitor C for dynamic equalising circuit of series connected thyristors is determined bya)forward characteristics of thyristorsb)reverse recovery characteristics of thyristorsc)both forward and reverse recovery characteristics of thyristorsd)none of the aboveCorrect answer is option 'B'. Can you explain this answer?
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