Resistor trigger circuit of SCR (Basics, Circuit, Working, Waveforms & Parameters) Explained

[@EngineeringFunda]

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[@dvrblacktech]

Ultimate sir....today is my electronics exam.. now I m capable of explain this by seeing this video..... well understood...thank you sir....

[@hemchandmovva4460]

TQ. SO....MUCH .. ....SIR IT.......IS....THE....ONE.......OF.......THE.....BEST.....EXPLANATION.. SIR we all r support u sir

[@EngineeringFunda]

Your positive comments motivates me, Thanks and welcome 🙏

[@hiteshdholakiya841]

If R is more than alfa is more, If R is less than alfa is less.

[@EngineeringFunda]

Yeah If R is more then current is less so alfa will increase and visaversa

[@avinashmisal954]

Hitesh bro insted of than use then bcz its changes meaning of sentences..🙏🙏

[@chittychittis3357]

@@avinashmisal954 yes, first I confused

[@avinashmisal954]

@@chittychittis3357 😊👍

[@yashashs3191]

Yes there is a mistake in the video

[@shrutimukherjee8378]

He save us at ultimate cost at the exam time !!!😢❤

[@EngineeringFunda]

Your Appreciations, care and share matters a lot to me. #EnginneringLove. All the subjects playlist of Engineering Funda is available in comment section. Share it with your friends to support us. Your positive comments motivates me and person like me get boosted by my students feedback. Thanks and welcome 🙏

[@roadlesstaken6790]

There should be a correction - Firing Angle is proportional to sin_inverse(R), therefore if R (the variable resistance) increases, firing angle will increase.

[@023_debarghyadebnath3]

correct

[@dewalpraveen23]

Thank u sir it's really helpful for diploma and engineering students

[@EngineeringFunda]

Most welcome

[@sandeeppandit6695]

Thank you sir for your efforts

[@EngineeringFunda]

All the subjects playlist of Engineering Funda is available in comment section. Share it with your friends to support us. Your positive comments motivates me and person like me get boosted by my students feedback. Thanks and welcome 🙏

[@DarkRedZane]

Thank you sir! All was crystal clear except to the Resistor-Alpha part. Other than that it was well explained!

[@mdsarfarazhussain2872]

Thank you Sir , I am getting to learn a lot about the subject . Your process of teaching is very helpful , and thanks for giving time for snapshots 😊 ...!!

[@EngineeringFunda]

Your positive comments motivates me.

[@maddkraut03]

nice presentation

[@MANISHH]

VERY NICELY EXPLAINED SIR

[@nickjung1199]

if you increase the value of the potentiometer (R) you reduce the current and so it should take longer until the SCR fires, so alpha should increase with increasing R?

[@edwinr4378]

yaa

[@chandankumar-vi3dw]

Yas

[@sudeshna.m7289]

As R increases the current reduces and it takes more time to reach the required value of gate voltage that is required to turn in the SCR. The angle at which SCR is turned on is called firing angle (alpha)

[@sudeshna.m7289]

This if R increases the value of alpha would also increased.

[@MrYounisah]

increasing of r in the gate circuit will increase firing angle alpha , decreasing of r in the gate circuit will decrease firing angle alpha

[@rakshithms2638]

Thank you sir.. session was helpful

[@vipuldhokte6537]

As value of resistor increses trigerring angle will also increases. Sir you say wrong resistor increases firing angle decreses

[@DAECAkashKR]

Yes bro u are right....by increasing R current decreases so the SCR turn on lately and alpha increases

[@shubhankarghosh]

You are wrong!! If r increases then alpha also increase and vice versa. When r is low then the gate current is sufficiently large to trigger the device instantly, and when R is high then gate current is small and the device will trigger slightly later

[@unorthodoxinsaan2336]

Yes yes you are right bro because I were also thinking that...

[@hemchandmovva4460]

@@unorthodoxinsaan2336 same situation bro I'm also face this situation

[@abhilashps7732]

that is what he also said bro when r is low ,alpha is low too he just said it another wat that's it😬

[@shubhankarghosh]

@@abhilashps7732 he didn't said that, watch 10:18

[@mydukurusravan1991]

Explain about trial firing circuit using diac

[@EngineeringFunda]

It is there in my playlist of power electronics

[@s.i.7355]

Sir , Is thyristor firing circuit is same as trigger scr uring resister . Sir please make Vedio about Thyristor firing circuit..

[@s.i.7355]

Sir please tell me

[@EngineeringFunda]

It is one type of thyristor firing

[@arjun4515]

Explaining is very clear to understand...but my question is ?)why silicon is use in SCR ...?

[@EngineeringFunda]

It is Semiconductor

[@arjun4515]

@@EngineeringFunda i know sir but we can also use to germinium instead of silicon ..but in all operations why silicon is used...

[@EngineeringFunda]

Germanium has less power handling capacity compared to silicon. So in most power electronics devices silicon is used

[@arjun4515]

@@EngineeringFunda satisfied...👍

[@kalyanidevaraju1369]

@@arjun4515 lekage current for germanium is more when compared to silicon so we prefer silicon instead of germanium(silicon controlled rectifier instead of germanium controlled rectifier)

[@jaisiddhisuperpowerpltd1872]

Sir in our circuit we are facing problem in which current show in multimeter is 0.7ampere but it is showing in tester every much current and it is shoking Explain what is the problem

[@veeresh.b.vveeresh4861]

We need some calculation related to R triggering.

[@pankajchauhan5180]

BRO PLEASE ALSO TELL WHERE YOU ARE TAKING OUTPUT VOLTAGE ACROSS WHICH TERMINALS

[@azheennazhad2205]

why is it between 0-90?

[@yashashs3191]

that's intuitive, if alpha cannot be more than 90 cuz, if it was then it means it used to get triggered at a particular voltage that comes after 90, but u ll get the same valuee before 90 also

[@SteVen-be7ic]

I don't understand the purpose of Rb. It takes away some of the triggering current, and when the thyristor is activated, it is also supplied from the main circuit?

[@adarshadarshsaxena]

In case of negative half cycle, the SCR will behave as a open circuit.But there is still a path for the current through resistance Rmin branch. So how can the load current be zero?

[@EngineeringFunda]

You see diode which is OFF during -ve half cycle.

[@adarshadarshsaxena]

yeah, you are right, missed that thing. Thanks!

[@surajgheware3709]

From scr characteristics if Ig is more Vfb is less and scr will trigger earlier but in this case Resistance is reducing the value of Ig then Vfb should be increased and scr will trigger delay by angle alpha..is it correct??

[@Zaim12363]

Dear sir if it is possible post practical videos ,related to power electronics .

[@dalenassar9152]

What about the diode (D)? What would happen if it was NOT there? Thanks for the great videos!

[@Silent_Shishya]

It is to prevent Gate-Cathode reverse bias to exceed peak reverse Vg during -ve half cycle

[@siddharthshah4929]

I cant understand that why they put secod SCR. Or use of othe SCR..

[@birusintianilbabu1921]

Why alpha is taking only 0-90 and what happened if the alpha is more than 90 degrees

[@prasunbiswas8025]

why the firing angle is within 90 degree?

[@sudarsanmanohar4395]

After 90 the volt decreases

[@yashthakur6927]

Why to limit gate current if we want to trigger scr

[@techasthra4421]

SIR CAN U GIVE THE NOTES OF EVERY VIDEO PLEASE I WANT IT

[@EngineeringFunda]

All possible notes are there on my android application engineering funda.

[@AdityaRaj-dp1no]

sir can you explain the use of diode in this ckt?

[@MohammedUmar-ow2pl]

❤

[@EngineeringFunda]

Your Appreciations, care and share matters a lot to me. #EnginneringLove. All the subjects playlist of Engineering Funda is available in comment section. Share it with your friends to support us. Your positive comments motivates me and person like me get boosted by my students feedback. Thanks and welcome 🙏

[@technicalelectricalenginee2410]

Sir 12 thyristor parlal conation kese kare

[@Jharkhandtakoriginal]

Is scr off duration in 14:00min time is currect or upto before firing angle

[@user-ei7yt7tg1i]

Different types of rating of scr ea bala vidio di gia

[@arundhatipatil4264]

Why alpha is from 0-90 degrees sir ??

[@dewalpraveen23]

It work as a phase control circuit ??

[@yogesh9545]

Applications of r triggering method

[@omkarhonrao1582]

Sir please also share theory of this topic .

[@akmphy]

What do you mean by "firing angle"?

[@EngineeringFunda]

Angle at which we trigger scr

[@krithikaa405]

how resistance value determine the firing angle.?we need to cross only the threshold voltage of gate.if R increase I decreases how alpha decrease?,please explain

[@EngineeringFunda]

If R increase then I decreases then forward break over voltage will increase so alpha will decrease

[@krithikaa405]

if alpha decreases means we obtain nearly full waveform. it means by increasing R I decrease ,once the scr is triggered how alpha value depends on magnitude of current?.how forward break over voltage increase will result in the decrease of alpha?I am still not clear,I surfed through net I couldnt get the answer.Please explain Sir

[@EngineeringFunda]

See the characteristics of SCR , as Ig increase Vfbo decrease.

[@ankitanand9574]

@@EngineeringFunda Sir ....... Many students in the commnets have asked this question about the relation between Value of Potentiometer Resistance(R) and The Firing Angle(Alpha). IT WOULD BE HELPFUL YOU PROVIDE US A DETAILED EXPLAINATION OF THIS IN ANY VIDEO OR IN THE COMMENT BOX. HOPE FOR YOUR REPLY SOON

[@UmarFarooq-yp5ym]

Without stablizing resistance, can we operate scr safely

[@EngineeringFunda]

Nope

[@UmarFarooq-yp5ym]

@@EngineeringFunda can we give voltage by 1.5 volt cell (AA size) to scr gate/cathode with potentiometer and Without using Rmin and stablizing resistance safely??

[@njkalita6324]

Sir is speed control of dc motor by scr is same with this?

[@EngineeringFunda]

Yes, you can change your load with DC motor

[@ankitanand9574]

If the value (R) INCREASES ...... The GATE CURRENT (Ig) DECREASES............ This results in the INCREASE OF FORWARD BREAKOVER VOLTAGE OF SCR(VfBO INCREASES) SO THIS SHOULD INCREASE THE FIRING ANGLE (ALPHA). Then why it is Decreasing ??

[@mohammadrameez3508]

I have to many questions sir . R (potentiometer) ko Kya variable resistant bol skte hai .agar ha to Rmin lagane ka faeda Kya hua R(potentiometer) ki value badane se bhi to current control ho skta hai . and Rb kaese stable krta hai smjh ni aya

[@mohammadrameez3508]

Aur sir hm agar Rmin se limited gate current bhej rahe hnto Rb ko gate resistance stabilize krne ki Kya zaroort h

[@055_tusharlad7]

Plz draw current waveform

[@Veerkushwaha-s5s]

Sir , how voltage across the src is 0. When there is load voltage. Plz sir.

[@EngineeringFunda]

If it is ON, it will short circuit, so voltage will be zero

[@HITESHTHAKOR-js2dh]

But alpha ko calculat kaise kare jaise manlo hame alpha 30 degree chahiye to R kitna rakhna padega ?? Kisiko idea hai

[@nickjung1199]

what is the derivation for the equation of Rb?

[@HITESHTHAKOR-js2dh]

What about calculation??

[@mukundchippalkatti6061]

Why is the angle Alpha limited to 90?

[@Silent_Shishya]

Because the source voltage is maximum at 90° and Ig(min) has to be achieved between 0-90°

[@Jharkhandtakoriginal]

What is the ratio of R/Rmin

[@veedapusiddhartha4895]

Sir how alpha decreases as resistance increases

[@shreyasingh5750]

It is wrong. Engineering Funda has reply to other comments

[@pranavjs]

there is a mistake,if R is more,alpha should also be high...directly proportional

[@EngineeringFunda]

See the pinned comment.

[@jwngdaoboro8219]

Upload the notes you have written

[@pramvarma1851]

Isme load phle kyu lagaya???

[@chandrashekhar1301]

why so many ads

[@EngineeringFunda]

It gives me some earning

[@adarshmondhe6526]

There are only three wave forms

[@shivuvhemanthkumar6005]

Sir can send your notes

[@EngineeringFunda]

You can take it from Android Application Engineering Funda

[@arvindkumarrawat2366]

Machine notes

[@shivaprasad3512]

Not satisfied

[@SubhamDas-kc3cx]

Vogasss

[@silenterror5929]

Gate ke current(Igm) ko Control kiyu kar rahe hain .... jo Gate ki Firing hai kiya wo Current par Depend hai ...????

[@UmarFarooq-yp5ym]

Because scr is current controled device