UJT (UniJunction Transistor) Working & Characteristics in Power Electronics by Engineering Funda
ฝัง
- เผยแพร่เมื่อ 10 ม.ค. 2018
- In this video, i have explained UJT (UniJunction Transistor) with following outlines:
1. UJT Structure
2. UJT Symbol
3. Equivalent Circuit of UJT
4. Intrinsic Standoff Ratio of UJT
5. UJT operation (UJT working)
6. UJT characteristics
Engineering Funda channel is all about Engineering and Technology. Here this video is a part of Power Electronics.
#UJTWorking, #UJTCharacteristics, #UJT, #PowerElectronics - วิทยาศาสตร์และเทคโนโลยี
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Reason behind why Ve decreases in the negative resistance region:
As the Ve is increased the emitter current Ie is also increased and the junction behaves like a typical P-N junction. But the Ve can be only increased up to a particular point called Vp (peak voltage). At this point a considerable amount of emitter current (Ie) flows and a significant number of holes are injected into the junction. These holes are repelled by B2 and attracted by B1. As a result, the region between emitter(E) and B1 terminal starts saturating by holes and the conductivity of this region starts to increase. This phenomenon of increasing conductivity by the insertion of holes is called conductivity modulation. This increased conductivity reduces RB1 and η. This results in a condition where emitter current Ie increases and the emitter voltage Ve decreases. This situation is similar to a negative resistance scenario.
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Simple and clear explaination... Thankyou so much☺
Awesome explanation sir, helped me to understand semiconductors with ease. Definitely recommend your channel to others
Your welcome 🙏
Thank you sir..
For explaining UJT working clearly.
Tum jaise log bagwaan ho yaar. exam ke raat ko sab Kuch samjaadete ho
xDDD kal mera bhi exam hai. ye videos dekh kar pass toh ho hi jaunga
Suprb
Love your videos ... Just continue the work sir..with all due respect.. I like the way you explain on paper with summing all about the topic and reducing the time of effort for us.. take care sir.
I really like your name . God bless you
@@EngineeringFunda thanks a lot sir..
I call my son krishna
Thanks the world's best teacher
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Was able to understand the concept clearly.
I read my book after watching the video and it made my work easier.
Thank you Sir
Excellent, clear teaching!
thankyou sir.. made.my day😍
It's really very easy to understand. Thank you for providing us such a good video.
Your classes helped me a lot bro thanks for making this video lectures 👌 very simple and easy explanation
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Thankyou sir...really helpful 💛
Great man
U saved lot of time
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So thankfull for your video sir
Good explanation...thank youuuuu 🌹
Thank you very much you save me from my reporting😍🥰
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sir thank you so much sir I was facing a lot of difficulty in this topic you explained well than my college professor
Your welcome 🙏
Great video sir!!!
Sir you are really great sir.......your teaching very super ellarume purinjukkaramari irukku idhemari innum neraya videos podunga sir please
Sorry dear but didn't get anything as I am Gujarati
@@EngineeringFunda He is from TN and he's saying that the way you teach makes it very easy to understand and he's also requesting you to upload more videos like this! Cheers and Jai Hind Bhai.
It's very easy to understand while ur telling the topic sir . thanks for telling the topic very easy..all the best for ur more videos
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Thank you for this video. I hope you also make applied theory to real objects. Appreciate it
sir you are really awesome sir
Amazing explanation
Anyone from DU here ?....
Thank you very much sir for such nice explanation. 😊
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Thank you sir🙏..
U explained very easily
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Very sharp description..... Sir
It's really good
LOL🤣
very good, very precisely explained. Congratulation
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Please make a video on UJT based triggering circuit for SCR
It is already there in my playlist of Power electronics
The lecture is great indeed.
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10:35 resistance increase as temperature increas ............... not like what he says in the video
but steal he is right about what happen to Rb1 when the current increase
this is a semiconductor...and semiconductor has NTC...negative temperature coefficient...so when the temp increases the resistor will decrease
Concept clearing video 👍👍
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Quality teaching...👏
Your welcome 🙏
Awesome explanation
Your welcome dear 🙏
Well explained.
Thank you sir.... You explanation really helped
Love and happiness of students is my ultimate goal, God bless you 🙏, keep learning and keep progressing.
😚😚
Superb teaching sir
Sir super
Thanks sir
very good explaination
thank u so much sir
Nice video sir
Very good explanation sir.
❤️
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Great Explanation 😊
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u r the best
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Well done sir
Really amazing explanation ❣️
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@@EngineeringFunda why emitter terminal is so close to. The base1 terminal?
Super explanation sir ❤️❤️
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Nice explanation
Sir u haven't explained saturation region.
Nyc
P type aluminium rod? Metal semiconductor junction?
Sir after 3rd region there will be peak point again and valley point also right? Because in your ujt as relaxation oscillator you said charging will be from valley point to peak point and discharging will be from peak point to valley point
Yeah
Do video on UJT MORE AND BJT DEEP TOPIC usaid in before video is very easy language it is nice about UJT video
Tum bahut aacha kam karta hai
Everything u said is gd.but when it comes to working of ujt ,it seems that u've manipulated how voltage z decreasing....make it clear
Please explain more about INTRINSIC STAND OFF RATIO
Thank you some much sir
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Well Explained👌👌
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Nice work sir
Your welcome
Thank u sir
i have one doubt sir when temperature increases the resistance should increase but u r saying decreasing , I couldn't understand could you please explain me sir !
For semiconductor material, temperature decreases with increase in resistance and visaversa.
Dude to negative temperature coefficient
Sir very nice
sir could you explain why there is a negative current when there is no voltage applied at emitter terminal ?
thank you sir !
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Great
thank you
Thank you sir.
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Sir plz can you upload the , how to do the ujt experiment in labs with clear video
nice explanation
Your positive comments motivates me.
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Thank you sir...
Your positive comments motivates me.
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Very nice
Your welcome 🙏
Thoppppp good expalnation🤩🤩🤩🤩🤩🤩
Your positive comments motivates me, my goal is to create largest community of engineers in entire globe, so please help me for that by sharing this lecture series(playlist) with your friends in social media (watsapp, telegram etc). Thanks and welcome 🙏
Excellent sir ,
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Sir in active region why the Voltage decreases??
Sirr in last u apload these concepts notes after completion of video
Thank you. Well explained
Your welcome
Sir please tell in which the ujt on and off
Sir,I want to know about working of solar cell diode and it's characteristics.Please explain about it.
tq
Thank you sir 🙏🙏🙏🙏🙏
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@@EngineeringFunda ok da
Dear sir , why capacitor is require in ujt triggering circuit
10:46 you said that the temperature increases so temperature decreases, but according to books if temperature increses then resistance also increases.
this is a semiconductor...and semiconductor has NTC...negative temperature coefficient...so when the temp increases the resistor will decrease
Please put videos for gate and technical exams in power electronics.....
Tq sir
Sir how we give input supply?because there is only one terminal in output
Why current further increase after vally point?. Please reply
In negative resistance zone, conductivity modulation is happening. Other then negative resistance zone it is linear device.
Sir good but better to start with symbol.
Good
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why negative resistance stops at valley point. why does it not contineously increase emitter current with decreasing emitter voltage??
Sir your lectures are very cool...Can you suggest book(s) to read about power electronics as I am a beginner(competitive Exam level).
For power electronics Salman rasdi
Dr. R. S. Sedha (Electronics)
According to the problematic question how we can take the vd or to find the vd value
TQ sir
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How come current is increasing (or resistance is decreasing) in negative R region without Voltage increasing and making it more forward biased? Voltage must increase for that to happen and if voltage is increased then resistance is positive.
Sir ujt triggring of scr and ujt are the same topic plz rply
Yes
thanks sir
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