What is a Thyristor? How Thyristors Work? (Silicon Controlled Rectifier - SCR)

In this video, I will try to explain you the structure and working principle of thyristors used in fast switching duty in power electronics circuits. Thyristors are made up of four semiconductors of type P and type N. Thyristors are abbreviated as SCR, which is the initials of the words Silicon Controlled Rectifier.
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#thyristor #scr #electronics

[@NumberOfMan]

Thanks for this simple and clear explanation on how an SCR works.

[@eeapplications]

Thank you 😊👍

[@christiaanluies2375]

So much better than learning from my book. Thank you!

[@eeapplications]

Glad you like it 😊

[@skydog22]

I will use right now, thank you, friend.

[@agstechnicalsupport]

Good video on functioning of thyristors. Thank you for sharing !

[@eeapplications]

Thank you so much ☺

[@tnamen1307]

Nicely simple explain.
In fact, the thyristor act as IC waiting for Input and turn on the bulb. Now I will used the thyristor as IC for my D C PROJECT.

[@eeapplications]

Thank you so much. I wish you success in your project ☺️

[@dievereybagatsolon6433]

you saved my life right now

[@electrum5449]

Easily understood ,thank you!

[@eeapplications]

Thank you 😊

[@Savage-lx5yj]

Excellent! Thank you for sharing sir.

[@eeapplications]

Thank you so much ☺️

[@howardmutorera2546]

Excellent explanation. Thank you!

[@eeapplications]

Thank you 😊

[@chabirajpersaud3001]

Great Job Sir!

[@eeapplications]

Thank you so much.

[@enriqueguzmanramirez5584]

Excellent explanation!

[@eeapplications]

Thank you so much 😊

[@nipunwijewardhana3623]

Thank you 🔥❤️

[@tarunparashar3478]

Very nice basic lesson about SCR

[@eeapplications]

Thank you so much 😊

[@anbuponam428]

Thank you for S C R function explanation.

[@eeapplications]

Thank you 😊

[@sumitnarkhede.3105]

THANK YOU SIR.

[@user-sq3ud2ol2x]

thanks for your lucture

[@ankitnsfw]

thanks for explaining it in a short video

[@eeapplications]

Thank you so much 😊

[@rwandanziza7927]

Continue working.You ciruit is well seen

[@anamulhq1566]

wow...its absolutely wonderful teaching.
Thanks a lot.

[@eeapplications]

Thank you so much 😊

[@anamulhq1566]

@@eeapplications please, explain reverse switch.
Thank you

[@eggxecution]

excellent expanation!

[@eeapplications]

Thank you so much ☺️

[@RSBot2jar]

Thanks 👍

[@guliyevshahriyar]

thanks teacher

[@rustamgizzatullin3495]

Brilliant!

[@eeapplications]

Thank you 😊

[@rehanmendis6345]

Thank you!

[@eeapplications]

🙏

[@jimsvideos7201]

Very well taught. You have a very good grasp of English as well; it is a difficult language to learn.

[@seshachary5580]

very nice. Thank you

[@eeapplications]

Thank you so much ☺️

[@dz-abouttechnique1849]

Nice video!

[@eeapplications]

Thank you so much 🙏🏼

[@segaran133]

Very good explanation

[@eeapplications]

Thank you so much ☺️

[@lvstjonnellfaith]

Great video but how is the lamp lighing when only 2 junctions are in FB?

[@GatvolFourie]

So the analog version of a Thyristor would be a self latching relay ? And Transistor a normal relay ?

[@rajulg1036]

very educational

[@eeapplications]

Thank you 😊

[@kingjilheartbeats]

Nice explanation,I want to use in 100amps thyristor and use relay for shorting cathode and anode as through the spot welding circuit I checked the output voltage is not full as we have in mains line so I am getting somewhat low amps in the connected transformer as load,can I short when needed?any problem occurs in bta100 ? please answer thanku

[@eeapplications]

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[@qaisarabbasi2219]

Goood explanation

[@eeapplications]

Thank you 😊

[@rwandanziza7927]

Very good

[@eeapplications]

Thank you so much 😊

[@whtninja024]

That's cool

[@eeapplications]

Thank you 😊

[@MrNgocTon]

I don't know if the current passing through the SCR depends on the trigger current. For instance, if I trigger the gate with a higher current, the current passing through the SCR will increase.

[@netlogic1ify]

Great video. When you short the thyristor with the button the lamp still lights but after release the button it's turn off?

[@cipmars]

Yes of course.

[@alexmarshall4331]

Excellent lesson on SCR...what current would the gate need to trigger SCR? Is there a very low current flow through SCR even when it has NOT been triggered?

[@eeapplications]

For the required gate current, we need to look at the datasheet of that thyristor. As with any transistor, it has a very small leakage current.

[@alexmarshall4331]

@Electrical Electronics Applications Hey thanks for getting back...good luck with your channel...from a damp cold south east London lalala 👉🇬🇧👈🤜🤜🤛‼️

[@nagrerelax5602]

Thank you for this sir

[@Daniel-xaogjeyh]

short circuit with high current through a pushable button? is that a good idea?

[@contytub]

there's no short circuit through the button ... what are you talking about ? the button is still in series with the bulb and won't have to pass more power than needed to turn on/run the light ... it's only doing what it should do and literally nothing more

[@wissamstephan6874]

but how when we released the hand from the switch the lamp still light up we consider the thyristor as a PNPN so with no current in the gate one the PN precisely the middle PN will block the current how's that

[@augustussinclair1626]

i believe that it's due to a concept called _gate triggering_ which works by injecting electrons into the 2nd p zone (so, pnPn - the uppercase p here) and thereby gradually turning it into a third n zone (aka turning the structure into pNNN) which is basically by diminishing its depletion region. that's how you basically get a forward-biased diode out of a thyristor.
keep in mind that i could very much be wrong, i'm watching these videos to learn about thryistors myself lol

[@WildEngineering]

thigh-wrist-or

[@d.athegreat3947]

Tree-star.
😂😂😂

[@Gahoole39owl]

When the guy explaining is having more practical experience (even with little English he has) I would call it thiristor coz than Thyristor will have no authority🤙.

[@WRDO]

Hello , "If the input is 240v-20amp and set the out put to 50% is the output will be 120v-40a or 120v-20a ?"

[@eeapplications]

Hello. The current value does not change because it depends on the load.

[@WRDO]

@@eeapplications thank you very much for your help, i need to use the SCR to power SiC heating elements ! do i need to use transformer also or only SCR will work? what do you think ? thanks

[@thefinalmovements80]

Good

[@eeapplications]

Thanks 🙏

[@Nino11420]

Great video,do you have also example for ac circuit?

[@eeapplications]

Thank you so much ☺️🙏🏼

[@mikeadler434]

👍👍

[@prasadkarlekar7856]

Instead of short circuit can't we cut off button between lamp and source

[@gholamrezaebrahimifard7325]

Hello dear friend I wanted you to answer my question Are you sure that by connecting the other two pins of the thyristor to each other, the circuit will be opened again as a switch and the lamp will be turned off?

[@eeapplications]

Hi dear friend. When we short-circuit the other two pins, the thyristor becomes open-circuited. After the thyristor is open circuit, we already take our hands off the button. So we don't make short circuits all the time. I hope that has been revealing.

[@manpreetkumar5115]

Thank you Sir ji thyristor ac supply per work krta hai ya nhi .

[@eeapplications]

Thank you. Maybe we can make a video in the future.

[@alphajuliet5697]

So, if u put a small current at the gate, the anode and cathode will have a high current flowing? 🤔

[@eeapplications]

Yes it works that way 👍

[@alphajuliet5697]

@@eeapplications ohh! Perfect 🙂🙃

[@-_-_-_-_-_-_-_-.]

The button between anode and cathode must withstand the load current.

[@eeapplications]

Yes, it should be. Thanks 👍

[@-_-_-_-_-_-_-_-.]

@@eeapplications This is the main disadvantage of the circuit, that is why (in direct current) you can just replace it with a simple mechanical switch.

[@jumbo999614]

No resistor for LED? I'm a beginner. What I have learned so far is you need resistor for LED.
So this one is really new to me.

[@xrayer4412]

thats not an LED, its a lamp

[@msidibeh]

Where is the LED?

[@thumperman8490]

LED is an acronym for Light Emitting Diode, this is a semiconductor device that glows when a current passes through it. @@msidibeh

[@jyotipatgar9344]

In what range we have to take battery, resistor and thyristor?

[@eeapplications]

Hi. We should look at the datasheet information of the thyristor we will use and use a resistor according to the current and voltage values ​​there.

[@runpvt6524]

@ 4:25 how is this lamp get OFF,
Current will pass trough swith and is getting a closed path, so bulb should light up na

[@eeapplications]

We don't keep the key pressed all the time. After pressing and pulling, both the thyristor will be open and the switch will be open. So the lamp goes out.

[@runpvt6524]

@@eeapplications thanks for the explanation 🙏

[@somay9830]

@@eeapplications nice

[@plinker439]

Why are they using that for motorcycle ignition? Why not use just a transistor?

[@manjeetsahu4490]

Too good.
But try to teach why it is used in every video

[@eeapplications]

Thank you so much 😊 I will take your advice into consideration 👍

[@ajandali]

But doesn't the MOSFET works in the same way?

[@eeapplications]

Yes, the working logic of the thyristor is slightly different from the transistors 👍

[@mikek1187]

MOSFETS can't hold the drain and source open once the gate current is gone. Thyristors are essentially a solid-state self-latching relay, hence the need to break the connection by shorting it. Thyristors are used in "crowbar" circuits because they can handle such high amperages. Placed near the exit point of a power supply voltage circuit, in conjunction with a zener diode and resistor, a thyristor can shunt current back to a fuse, preventing any sensitive components from being destroyed, in the event of an electrical issue. It's a shame we don't see more crowbar circuits in electronics today, as fuses tend to survive the sensitive electronics more times than not.

[@jazzle9121]

Yeah that is tristors

[@er_ashish]

Your last circuit is wrong bulb will glow in last point also change the circuit'

[@eeapplications]

There is no error in the circuit. When the button connected to the thyristor is pressed, the current flows through the button. Thyristor becomes open circuit. The lamp goes out.

[@er_ashish]

@@eeapplications but i think when we shunt the thyristor the current will flow through shunt switch and bulb will glow continuesly.

[@er_ashish]

@@eeapplications Yess

[@homestudio3539]

@@er_ashish I think those switch used are not hold in switches. They are just push in buttons which cuts the moment you release the switch so the bulb will stop glowing.
🙂

[@nazmulislam1804]

Can't you explain with normal English..why are you trying to pronounce like British accent...??

[@eeapplications]

Hi. The accent that I learned and used is the British accent. That's why I'm telling it this way.

[@alexmarshall4331]

BOOOOOOOO!!! I bet you can't speak another language...thank you for posting this excellent video