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The turn off and turn off mechanism of a thyristor can be best explained by the gate turn-off thyristor. The thyristor uses the reverse bias mechanism.
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Example sentence with the word turn off?
can you turn off TV? Do not turn off lights!
How do you turn off an electromagnet?
This is what makes a magnet an electromagnet - the ability to turn it on and off... Anyway, electromagnets can be turned off with either the help of a switch, or just by disconnecting the power supply.
How do you use turn off in a sentence?
Mary asked me to turn off the light, but I didnt want to because I was so tired that the switch seemed miles away.
Do all branches in a parallel circuit have to be on?
No, they do not. Think of it this way. Your house is one huge parallel circuit. Not every branch is on all the time. You turn switches on and off to turn individual branches on and off at will.
How can we reduce the amount electricity we use at home and school?
The easiest way - is to get into the habit of turning off equipment that's not in use !
Why turn-off time of a thyristor is greater than turn-on time?
turn off time is greater than turn n time why because on state is does not changed.
What is class A commutation of thyristor?
it is one of method to turn off scr. resonating LC component is used to turn off scr
What solid state componet can be used as a switch to turn current on or off?
The solid state component that can be used as a switch to turn current on or off is a thyristor.
Why the Gate triggered method is always preferred to turn on the thyristor?
A: Because that is the controlling lead of an thyristor. .To do it otherwise it will be on-off at hi voltage only
What does forced commutation mean?
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.
How are silicon controlled thyrister different from gate turn off thyrister?
A; There is just no thyristor that can be turn off with the gate. Once on it will stay on until the holding current is reduced and or the voltage is reversed in polarity. The gate is only used to turn it ON never off.
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.
Why transistorised inverters are prefered over thyristerised inverters?
The transistor allows you to turn it off when you want, while the thyristor, or SCR, will not turn off until the anode-cathode voltage drops below the cutoff voltage.
What are the necessary conditions for turning ON an silicon controlled rectifier?
A: Two conditions one the gate has current flowing trough the other is forward voltage breakdown
How does the transistor circuit differ from the thyristor circuit?
A thyristor is a "triggered" device. It will remain off until its gate electrode is made to conduct. It will then stay on (showing a very low resistance) until the power is removed, or (in Gate Turn Off devices) until a turnoff voltage is applied. A transistor can be used as a variable-resitance element. While it can be made to switch (like a thyristor) it does not need any special turn-off: just remove the input signal and it will go open circuit. A transistor can be made to respond to a vaying input signal with a varying resistance, so it can be used as a linear (analogue) amplifier.
How has thyristor term been coined?
The term "thyristor" was coined from the terms "thyratron" and "transistor". A thyratron was a gas-filled vacuum tube switch - when triggered, it developed a low impedance path from cathode to anode, and that path stayed in place until the current through the tube ceased - you couldn't "turn it off". The thyristor was seen as a "solid-state thyratron".
Why are two thyristor required for ac switching?
Because they are silicon controlled rectifiers, in other words a diode you can turn on (you can't turn them off, this happens when the voltage passes through zero). Therefore if you only use one you would end up with half wave a.c. This means you can't reach full power. Using a second one to control the other half of the cycle solves this problem. This is why the Triac came to be, it is really two thyristors in one package. Two thyristors are also used in D.C. Controls too, to turn off the main thyristor the second one dumps the voltage into a capacitor allowing the main thyristor to unlatch.
