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The term "Forced commutation" is used when a thyristor is turned off using external components.
If a thyristor is used in a DC circuit, when first turned on, it will stay on until the current goes to zero. To turn off the thyristor it is possible to use a Forced commutation circuit. The circuit creates a reverse voltage over the thyristor (and a small reverse current) for a short time, but long enough to turn off the thyristor.
A simple circuit consist of a precharged capacitor and a switch (e.g. another thyristor) parallel to the thyristor. When the switch is closed, the current is supplied by the capacitor for a short while. This cause a reversed voltage over the thyristor, and the thyristor is turned off.
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What is commutation of thyristor?
the process of turning off of a thyrisror is known as commutation
Who was sojourn truth forced to marry?
She was forced to marry fredrick.But they did have some kids,But one of them died of infant..
What the name of a Cinderella story is it is based on the sister and makes Cinderella the evil or mean person and the sister is the good one?
No, in the movie a Cinderella story, Cinderella is still the nice one and the sisters are the mean ones. I know this because i have a little sister and was forced to watch it.
Under what conditions were the Cherokee forced to leave their homes?
the indians were forced by andrew jackson to go on the trail of tears.
What if your black codes African-American children found to be vagrant were often?
Apex - forced into convict labor until they were adults
What are the types of commutation?
Two types of commutation process 1) Natural commutation 2) Forced commutation
What is load commutation?
it is a type of forced commutation technique of thyristor
What is the difference between current and voltage commutation?
Voltage commutation: This is possible in ac circuits...The thyristor gets turned off by reverse bias (negative half cycle) voltage applied across it. This is also called line commutation. Current Commutation: This is possible in dc circuits ...This type of commutation makes use of auxiliary circuit which contains inductor,capacitor,diode and even a thyristor(auxiliary). This is called Forced commutation.
How commutation can be improve?
Generally there are two methods of improving Commutation :- 1.Resistance Commutation 2.Emf or Voltage Commutation The Commutation can also be improve by using interpoles and compensating windings.
What are the difference between choppers and inverters?
chopper transforms ac to dc (dc chopper) while all inverter transform dc to ac commutation used in chopper: forced,load commutation used in inverter:forced(180 vsi),natural or line(120 vsi)
What is commutation of thyristor?
the process of turning off of a thyrisror is known as commutation
Natural commutation is used in which kind of circuit?
phase controlled RECTIFIER circuit used Natural Commutation......
What are the problems of commutation in a DC generator?
1.resistance commutation 2.e.m.f commutation
What is a line commutation?
it is the natural commutation ...by making open circuit or short circuit on the thyristor to make it turn off.
Definition of last pay drawn?
last pay drawn meaning? what is basic pension is it pension before commutation or after commutation?
What is the power of commutation?
The power of commutation is a power only given to the president of the United States and is the power to commute (reduce) the length of a sentence or a fine by a court.
What is line commutation?
i think i know this answer...line commutation is the commutation in single phase inverters/converters when there is current flow back to the source.. It can also refer to a method of turning of a semiconductor device known as a Thyristor or SCR, sometimes called natural commutation. In this method the current between the anode and cathode is interrupted or dropped to a point where the Thyristor can no longer maintain its latch or keep conducting, shutting the device off.
