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

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

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@@eeapplications please, explain reverse switch. Thank you

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Yes of course.

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.

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

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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

Thanks 🙏

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

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

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

@@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

thats not an LED, its a lamp

Where is the LED?

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

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.

Tree-star. 😂😂😂

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🤙.

Yes it works that way 👍

@@eeapplications ohh! Perfect 🙂🙃

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.

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.

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.

@@eeapplications thanks for the explanation 🙏

@@eeapplications nice

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

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

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.

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.

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

@@eeapplications Yess

@@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. 🙂

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

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