0
A thyristor is a part of a alarm circuit you use it so the alarm stays on
Wiki User
∙ 15y ago
Add your answer:
Earn +20 pts
Why thyristors are preferrred over transistors?
Thyristors are preferred in applications that require the characteristics on a thyristor. Thyristors are quite different to transistors, when they turn on, they stay turned on untill the power source is removed. Transistors conduct as controlled by the emitter current.
Generator how it excite its self?
A generator excites it self due to a high power thyristors feeding to a rotor through slip rings. Once excited it lessons maintenance and operational requirements.
Why silicon is used in scr?
For the same reason it is used in transistors and ICs: its a very good semiconductor. Note: equivalent devices have been made with germanium in the past, when most transistors were germanium. But they called them thyristors not GCRs.
What is the difference between controlled and uncontrolled rectifier?
A simple rectifier is a diode. It only has two terminals and will only allow electron flow in one direction only. A controlled rectifier (SCR=silicon controlled rectifier) has a third connection (gate). Which as the name suggests, is a gate that controls at which point the rectifier will work. It therefore has a level of control.There are various types and you would need the application specification, to get the best use of them.
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.
What has the author M Gaudry written?
M. Gaudry has written: 'Redresseurs et thyristors' -- subject(s): Silicon rectifiers, Thyristors
Why thyristors are preferrred over transistors?
Thyristors are preferred in applications that require the characteristics on a thyristor. Thyristors are quite different to transistors, when they turn on, they stay turned on untill the power source is removed. Transistors conduct as controlled by the emitter current.
Operation of commutating capacitor?
Commutation Capacitors are usually switched in parallel to the thyristors.
How matrix converter evolved?
At first, there was cycloconverter with thyristors, then matrix converter with IGBT...
Can SCR be replaced by TRIAC?
Yes since the SCRs act as the real thyristors
what are the condition for thyristors to conduct?
A forward bias A positive pulse to the gate of the thyristor.
What are the switching elements used in high voltage?
There are devices called thyristors which are used for switching purposes in high voltage levels. Thyristors are of different typesSCRIGBDiacTriac, etc.Apart from these MOSFETs, a type of transistor, are also used in high voltage switching applications.
How many number of thyristors are used in the single phase full wave bridge?
A full wave bridge uses 4 diodes to operate. A half wave bridge used 2 diodes to operate. Thyristors used in a full wave bridge are triggered diodes. To make these types of bridges operate a trigger board is required to be connected to the gate input of the thyristor. Thyristors are also known as silicon controlled rectifiers (SCR).
What has the author William Fong Yan written?
William Fong Yan has written: 'A study of the turn-on mechanisms in thyristors'
What is reverse breakover voltage in scr?
That depends, you should look it up in the datasheet. For some thyristors it's as low as 6V
What has the author Shashi Bhushan Dewan written?
Shashi Bhushan Dewan has written: 'Frequency and phase conversion using thyristors'
What has the author Sukhamoy Das written?
Sukhamoy Das has written: 'Some electromagnetic field problems in D. C. machines supplied from thyristors'
