PUT as Relaxation Oscillator (Basics, Circuit, Working, Waveform & Parameters) Explained

PUT (Programmable Unijunction Transistor) as relaxation oscillator or SCR triggering using PUT is explained with the following Outlines:
1. Meaning of Relaxation of Oscillator.
2. Circuit of PUT as Relaxation oscillator.
3. Working of PUT as Relaxation oscillator.
4. Waveform of PUT as Relaxation oscillator.
5. Designing parameters of PUT 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 #PUT #PowerElectronics @EngineeringFunda

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[@PrajktaSalunkhe-k8u]

Rk has missed in time calculation. Rk is the resistance for discharge the capacitor. So I think we have to take it in formula.
By the way I feel grateful for watching this video. This video is very useful for me for product development.

[@EngineeringFunda]

Your welcome 🙏

[@mnada72]

Is the output in this circuit should be connected to the gate of scr to trigger it to conduct ?

[@EngineeringFunda]

Yeah

[@dgaurav100]

Nicely done

[@EngineeringFunda]

Your welcome

[@ShahidShaikh-sk2vb]

Sir, log would be base 10 or base e??

[@EngineeringFunda]

10

[@roshanghorad5396]

You must make tutorial on 'Opto coupler' based SCR Triggering

[@RamLall106]

Sir from where this minimum voltage comes on voltage input graph v subscript v??

[@rohanjoshi1448]

Thank you very much sir

[@aitchjayem2294]

can you help me please
at 12:15 you wrote n=Vp/Vbb
why
dosnt Vp=Vbb.n + Vd
n=Vp-Vd/Vbb
please help me

[@ec2year852]

Vd is negligible 🙌

[@SurajsinhKarande]

Y u Scr in not connected in ckt???
UJT and PUT oslr

[@EngineeringFunda]

Output of oscillator is connected at gate of SCR. I thought it's pretty clear to all so I have not shown here.

[@27-sagarsakpal9]

Thakue Sir😍

[@EngineeringFunda]

Your welcome

[@SurajsinhKarande]

Many time consume when u use written vi chr and working...

[@rouletteplace]

You missed explaining the most important point of Vp as defined by the voltage divider.