UJT as relaxation oscillator (Basics, Circuit, Working, Waveform & Parameters) Explained
ฝัง
- เผยแพร่เมื่อ 22 ม.ค. 2018
- UJT as relaxation oscillator is explained with the following Outlines:
1. Basics of UJT as Relaxation of Oscillator
2. Circuit of UJT as Relaxation oscillator
3. Working of UJT as Relaxation oscillator
4. Waveform of UJT as Relaxation oscillator
5. Designing parameters of UJT as Relaxation oscillator
Chapter-wise detailed Syllabus of the Power Electronics Course is as follows:
Chapter-1 Power Semiconductor devices: • Power Semiconductor De...
Power Diode, Power BJT, SCR - Silicon Controlled Rectifier, Dynamic Characteristics of SCR, Gate Characteristics of SCR, SCR Triggering methods, Turn of OFF process of SCR, SCR Protection, Thermal Protection of SCR, Two Transistor Analogy of SCR, SCR Mounting, Resistor Triggering of SCR, RC Triggering of SCR, Methods to improve di/dt ratings of SCR, UJT - Uni Junction Transistor, UJT as Relaxation Oscillator, PUT - Programmable Unijunction Transistor, PUT as Relaxation Oscillator, TRIAC in Power electronics, Modes of TRIAC, DIAC in Power electronics, Comparison of SCR, DIAC and TRIAC, SCS - Silicon Controlled Switch, MCT - MOS Controlled Thyristor, Power MOSFET, Comparison of Power BJT and Power MOSFET, IGBT - Insulated Gate Bipolar Transistor, LASCR - Light Activated SCR, GTO - Gate Turn OFF Thyristor, Series Connection of SCR, Parallel Connection of SCR.
Chapter-2 Commutation of SCR: • Commutation in Power E...
Class A Commutation, Class B Commutation, Class C Commutation, Class D Commutation, Class E Commutation, Class F Commutation.
Chapter-3 Rectifier in Power Electronics: • Rectifier in Power Ele...
Basics of Converter, Rectifier and filter, Halfwave controlled rectifier, Single phase full wave controlled rectifier, Fullwave bridge controlled rectifier, Symmetrical Semiconverter, Asymmetrical Semiconverter, Three Phase Half wave rectifier, Three phase half wave controlled rectifier.
Chapter-4 Inverter in Power Electronics: • Inverter in Power Elec...
Series Inverter, Parallel Inverter, Single Phase Half Bridge Inverter, Signal Phase Full Bridge Inverter, Three Phase Inverter 120 Degree Mode, Three Phase Inverter 180 Degree Mode, PWM Inverter.
Chapter-5 Chopper in Power Electronics: • Chopper in Power Elect...
Control Strategies of Chopper, Step Up Chopper, Step Down Chopper, Class A Chopper, Class B Chopper, Class C Chopper, Class D Chopper, Class E Chopper, Jones Chopper, Morgan Chopper.
Chapter-6 Cycloconverter in Power Electronics: • Cycloconverter in Powe...
Cycloconverter, Basics of Cycloconverter, Step Up Bridge Cycloconverter, Step Down Bridge Cycloconverter, Step Down Cycloconverter, Step Up Cycloconverter, Three Phase to Single Phase Cycloconverter.
Chapter-7 Converter in Power Electronics: • Convertor in Power Ele...
Buck Converter, Boost Converter, Buck Boost Converter, Flyback Converter with discontinuous mode, Flyback Converter with continuous mode, Isolated Forward Converter.
Chapter-8 Application of Power Electronics: • Power Electronics Appl...
On Line UPS, Off Line UPS, SMPS, Comparison of SMPS with Linear Power Supply, Dielectric Heating, Induction Heating, Battery Charger.
Engineering Funda channel is all about Engineering and Technology. Here this video is a part of Power Electronics.
#RelaxationOscillator #UJT #UnijunctionTransistor #PowerElectronics #EngineeingFunda - วิทยาศาสตร์และเทคโนโลยี
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Sir aap bahut acha se basics k saath padhate hai
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Your positive comments motivates me.
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Sir, how the firing angle of the scr varied by using ujt relaxation oscillator
I haven't understood it in whole semester and now I understood in 14 min, thank you
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Relaxation amplifier is also called relaxation oscillator??? Is it?
Always best
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Thank u sir
Excellent explanation
How do you claculate leakage current a UJT
In design parameters what about the resistance R1 ?
Super lectures sir....
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Sir pls do a video on relaxation time problems
Sir I think their is a problem in time period T and time off
PLEASE show how they differ by...
Rest of video is 👌👌👌
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Ujt as a relaxation oscillator and simple ujt ckt me intrinsic stand off ratio alg alg ho jayga aise to??
Base terminal upper niche hone s??
Super
Thanks
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please explain synchronised UJT triggering
after its full discharged it changes their polarity and starts charging with another polarity. this is described in operation of current commutated chopper
See in capacitor polarity of charging and discharging doesn't change. In inductor it happens.
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Sir everything is correct but R2 should be up and R1 should be down .......very good lecture
Thanku
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But , sir given u r circuit in B1 instead B2 and B2 instead B1 ( According to text book)
It could be different ,it just a name . remember the logic only .
Which transistor can use in ujt relaxation oscillator?
Plz make video on PUT relaxation oscillato
It will there by today in my playlist
in previous lecture you showed b2 at upper side and b1 at lower side. In this its opposite , can we take it either sides?
I also having same doubt
Both r correct as long as vbb is provided from d upper terminal
To uper kr lo na koya paresani h resistor hi to h bs rating ka khyal rkho practical me
Plz check the time period formula.. nice lectures👍👍
It's fine
what about Vbb when capacitor is discharging???
If u would have mentioned what is relaxtion oscillator then it would have also been helpful
Omkar Chavan : I have explained that .... You see vedio properly
Oh Srry sir.. It was a nice video.
Sir please explain industrial firing circuit
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can you please share a study material for all session?
Do u have done phototransistor
Nope
Sir, please can you explain Cosine firing scheme
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What is the waveform across vb2
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How many parameters are given in the datasheet? Also do you have any videos on Programmable and Complementary UJT's?
Not yet
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sir can u tell me why we are taking only R2 in the time formula. ? why R1+R2 is not taking.?
i think it is actually supposed to be R not R2
Because only R2 is conducting not R1
Sir is half wave rectifier also a relaxation oscillator?
Nope
Sir, in books ln is given in place of log. Are they same??
Ln and log are different and I have given correct data
Sir, very good class . Can I get diac and scr
It is there in my power electronics Playlist
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Is it time base generator
in ckt parameters 3rd point why we took 10^4
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Why would the voltage of capacitor will not fall bellow the valley point voltage?😢
capacitor changes thier polarity after discharging, but u had not discribed in video so vtg across of C and output vtg should be negative at one time. i am getting disturbance to understand it.
Capacitor don't change its polarity while it's discharging
Sir can u explain mosefet
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Why the voltage of the capacitor goes to valley voltage and not 0?
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Why current not flow in upper part of ujt
Why you are not explain VB1 waveform?
is this ujt triggering of scr
What is the formula for R1?
How do I calculate R1 ?...if you don't know you can just say it, rather than ignoring it so that I can move on
PE paper in 2 days ... ur my savior 😂
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 🙏
Will R2 vary
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Why it is charging for valley voltage why not from zero
SCR GATE को TRIGGER हम UJT से क्यु करते है? जब की ये तो हम "Regulated DC " दे कर भी कर सकते है???
GATE को TRIGGER हम UJT से क्यु करते है? जब की ये तो हम "Regulated DC " दे कर भी कर सकते है???
sir plse check the time formula.
It is correct
It is incorrect in correct sir as in time formula instead of R2 R will take place
Sir why should we saw the thoot wave form in ujt
It seems like saw thoot due fast discharge of capacitor
Can we changed resistance rb1 to Rb2
No
can u solve my doubt?
Hello, first of all thank you so much for this series of lectures, but i have many doubts with this particular analisys of relaxation oscillator in many points:
-why didn't you assume the capacitor is initially discharged?
-why V0 = 0 every time UJT is off? shouldn't V0 be given by voltage divisor of VBB across R1 and R2?
-(most important) why C discharges only on R2 with time constant R2 * C? how can we prove this?
-how can we know that UJT gets off when V is at valley point?
thank you again.
how come output be 0? when there is Vbb applied
Because the pn juction i.e emitter base junction is in reverse bais till Vbb
What is width of triggering pulse??
It depends on R and C values
@@EngineeringFunda Is there any formula for finding it??
How to find eta value
eta is INTRENSIC STANDOFF RATIO .
eta= (Rb1/Rb1+Rb2) or (Rb1/Rbb). go through the equivalent circuit you will get this .
R and R2 are misplaced and complete eqns are wrong.
No equation for capacitance
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Thank u sir
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SCR GATE को TRIGGER हम UJT से क्यु करते है? जब की ये तो हम "Regulated DC " दे कर भी कर सकते है???
GATE को TRIGGER हम UJT से क्यु करते है? जब की ये तो हम "Regulated DC " दे कर भी कर सकते है???
GATE को TRIGGER हम UJT से क्यु करते है? जब की ये तो हम "Regulated DC " दे कर भी कर सकते है???
GATE को TRIGGER हम UJT से क्यु करते है? जब की ये तो हम "Regulated DC " दे कर भी कर सकते है???
By regulated DC you can give it once but for variable DC you need UJT
@@EngineeringFunda sir not under standing, it's mean,