What is a Thyristor? - A Galco TV Tech Tip | Galco
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- Опубликовано: 27 сен 2017
- A Thyristor is a four-layered semiconductor rectifier in which the flow of current between two electrodes is triggered by a signal at a third electrode. A thyristor usually has three electrodes: an anode, a cathode, and a gate. Thyristors are primarily designed to amplify and rectify the electrical currents that flow in high-powered electronic devices. A thyristor's four layers consist of a series of N and P-type material that connect with the anode, cathode and a logic gate. When a current is applied at the gate, the thyristor allows an amplified current to flow form anode to cathode. Although thrysitors can only transmit currents in one direction, they have three different operating modes: reverse blocking, forward blocking and forward conducting.
The most common type of thyristor is the silicon-controlled rectifier or SCR. When the cathode is negatively charged relative to the anode, no current flows until a pulse is applied to the gate. Then the SCR begins to conduct, and continues to conduct until the voltage between the cathode and anode is reversed or reduced below a certain threshold value. Using this type of thyristor, large amounts of power can be switched or controlled using a small triggering current or voltage.
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Fun Fact: The Thyristors Gained a Unique And Important Function For Railroad's Rolling Stock in 1971. This is when in Japan. Tōkyō Metro, Then Known as TRTA, Introduced the 6000 Series Train, Which had the Thyristor Chopper Motors, which was Considered New, and More Energy-Saving. Which also made some Nice Low Drone Sounds while Departing, Which also Followed for the 7000 And 8000 Series Trains, in 1979. JNR Introduced the 201 Series. Which was Going to Replace the Older 101 Series Trains On The Chūō Rapid Line. Which also Had Chopper Controlled Motors. Which made a Low Hum Sound while Departing from Idle, Which was Energy-Saving for Them Too.
Presentation is magnificent!
Good basic summary for thyristors !
You rock, Katie. Thanks for this!
Slow, smooth, awsome.
Thank you Max
Love this video.
Do you have any video about how it working ?
Excellent,thank you...
Great short video
Thank you!
Why are there two small gate lead wires? The symbol just shows one gate lead, and you mentioned that most have just one. What's the second one for?
Thank you ma'am for clarification on controlling Level of current flow in one direction. Jussojuan
i was looking at her all the time :D
Mam you said thyristors amplify the current in the beginning, is that correct ?
Nice explanationnb
Mam can u explain the triac charchterstics
How do you check the SCR if it still good or not by using a mulitmeter, or there is another way to check the SCR?
Forward bias it with the ohmmeter leads. It should read O.L. until you also bring the positive ohmmeter lead to the gate. At that point the SCR should turn on/ close/ conduct and the ohmmeter should read low (close to zero) ohms.
Saw that Galco logo, started craving chocolate. (if you know, you know)
Thanks
nice video. can u explain with small example using a circuit.
These devices primarily just rectify AC to DC. The gate is pulsed positive with respect to the cathode only when the device is forward biased will it conduct. It is very similar to a diode in that it will only conduct in 1 direction. The gate pulse only turns the device on, when the current gets below the minimum holding level it naturally turns back off again. If an SCR is pulsed when it is reverse biased (Cathode is positive and Anode is negative) it just won't do anything but it doesn't hurt it either. In fact many firing circuits in single phase applications pulse it at a 120Hz rate which means with a 60Hz power source the gate is pulsed on both the positive and negative half cycles anyway, but the SCR only conducts when the Anode is positive with respect to the Cathode.
@@GalcoIndustrial thanks
How can I check if my SCR is ok
I still don't get it. I got these thyristors with four leads. when I apply 1,5V across the thin leads, the thyristor conducts current and remains that way regardless of me reversing the 1,5V, removing it, or shorting the two small leads. it only turns off when I remove the load … could anyone explain why this happen? (I use it on DC)
Sure. All SCR's (big and small) have to go below their "minimum holding current" level to shut off. We refer to them as dumb diodes because they don't know when to turn on like a diode does. An SCR has to be pulsed on it's gate with respect to the cathode when forward biased to conduct. Diodes and SCRs both know when to shut off, when the current (not voltage) gets low enough they snap off. Notice I said current not voltage. The voltage does affect the current but so does the load the SCR is feeding. So if the voltage maintained and the resistance in the load was to increase causing the current to decrease, the SCR would shut off anyway once the current gets to its minimum holding level, ok?
alright, i'll buy some IGBT :) thank you
Ok that will respond to a voltage control signal on the Gate with respect to the Emitter. Not that you don't know this already, but most IGBT Gate driver circuits that we have seen here tend to hold the Gate a little negative to keep it shut off and up to 15volts positive to turn it on. You will have to check the data sheet for the particular device you choose to see what are the maximum voltages across the Source to Drain and Source to Gate (or Emitter to Gate I guess I should say) as well as maximum currents Emitter to Collector, ok? Good luck ian.
Thank you, I knew that. I was asking about thyristors because I have a bunch of big industrial thyristors lying around, I have solar panels with 220V 32A total output and no mechanical switch or thermostat can withstand the arc. Everything melts down in a few seconds. Now I understand why they don't turn off on DC. Thank you very much for your time, I appreciate it!
@@iankleinschmidt712 Very welcome
So basically thyristor is a diode that can be turned off.
Thyristo doesn't amplify or rectify electrical current, they are used in circuits that do these! Otherwise, awesome video! :)
If one does not succeed, try, try, "tryristor" again.
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underrated comment lmaoo
nice catch lol
Every thing was good but you look beautiful and a lovely voice
Creeeeeeepppyyyyyyy
@@jameshansing5396 eh this guy's just appreciating the host imo. It's still better than the other creepy comments here lol
@@nish3003 oh yeah a lot less creepy but not really necessary or relevant? The Chanel is based on info and knowledge not look at my tits n ass so so maybe compliment that?
Plus I find people saying stuff online like that odd, is that how you treat or act towards people in reality?
Either way…
@@jameshansing5396 lol yes I do agree with you. But if anyone complimented me abt my good looks or my voice (even though if I made education vids), it'd be appreciated by me, as long as it's innocent and not as creepy as the example you just gave. Such creepy ppl do exist unfortunately which makes the innocent ones also sound "sus" (cudnt think of any other word sry 💀)
@@nish3003 sus is a great word. Well I think you look pretty… all orange and lovely 😂
“Sem-eye” conductor
Good content but can be more elaborate..
Oki
What's her name..?
Katie
You take her for your wife, yes?
15 SEONDS OF INTRO
U are so beautiful Katie 😍
Get rid of the background racket, I will not watch.
you know nothing, but you read well
And you have no class.