Class A Commutation (Basics, Circuit, Working, Waveform & Modes) Explained in Power Electronics

Class A Commutation or Self Commutation or Load Commutation is explained with the following points:

1. Basics of Class A Commutation
2. Circuit of Class A Commutation
3. Working of Class A Commutation
4. Waveform of Class A Commutation
5. Modes of Class A Commutation
6. SCR turn OFF by Load Commutation

Chapter-wise detailed Syllabus of the Power Electronics Course is as follows:

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.

Class A Commutation, Class B Commutation, Class C Commutation, Class D Commutation, Class E Commutation, Class F Commutation.

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.

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.

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.

Cycloconverter, Basics of Cycloconverter, Step Up Bridge Cycloconverter, Step Down Bridge Cycloconverter, Step Down Cycloconverter, Step Up Cycloconverter, Three Phase to Single Phase Cycloconverter.

Buck Converter, Boost Converter, Buck Boost Converter, Flyback Converter with discontinuous mode, Flyback Converter with continuous mode, Isolated Forward Converter.

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.

#Thyristor #Commutation #PowerElectronics @EngineeringFunda

[EngineeringFunda]

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[skshareena]

Your explanation made me interest to study subject 👍

[AyushKumar-yhem]

Loved it. Tomorrow i am having power electronics internal

[ritikbhagat]

Nice explanation but i have one doubt that you said that after output current became zero then capacitor got discharged but how is this even possible as SCR doesnot support conduction in reverse direction.
Please explain!

[architkulkarni]

I have a doubt sir, i.e. Class E commutation is categorised under which type?

[-A-VikasBalaga]

Sir, in the waveforms how can scr current become negative?

[perfecta]

Sir shahed me adrak dalkar pijiye kafi farq hoga awaz me...sardi kam hojaingi...baqi teaching achi hai

[ManishKumar-iucf]

Thank you sir for the excellent explanation

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[VIKASKUMAR-qzlg]

Very good explanation in simple steps.
Thanks

[stormx]

One question. At the end the capacitor is discharging. But the scr is turned off. So how will it discharge as there is no closed path as turned off scr means open circuit

[subhashismaitra]

Please can you explain how the current is decreasing when capacitor gets charged upto VS, though the direction of current is the same as in the previous case.

[shashanksahu]

Thank u so much sir for this helpful video.

[amitkionlineclasses]

Sir very good explanation, keep it up

[NaniNani]

I have a dought Is the capacitor will allows the dc?

[subhashismaitra]

I am not understanding when capacitor gets charged upto VS, then the direction of current flow is in the same direction as the previous, then how current will decrease.

[immanuelreuben]

How did you even derive those equations from the previous da? Can’t you explain that?

[p_r_a_t_i_k__]

can not understand ta laplace transform plz help me

[NaniNani]

Sir main dought is if we want to turn off the SCR then we want to Connect L and C are in underdamped mode? Or At the start of the circuit it will be in under damped mode? Pls explain this

[alokpradhan]

U did not explain how the capacitor got discharged, how the voltage decreases to zero in