what is thyristor commutation?

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what is thyristor commutation?

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asked Sep 10, 2017 by anonymous

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What is mean by forced commutation of thyristor?

Last Answer : By using some circuit the forward DC current of thyristor is forced to zero is called forced commutation.

119 views 1 answer

asked Sep 21, 2017 by anonymous

What is mean by natural commutation of thyristor?

Last Answer : Natural commutation is also called as line Communication. The turning off of thyristor due to AC supply is called natural commutation or line commutation. If the thyristor is connected to AC supply ... connected to positive and anode terminal get connected to negative, this turns off the thyristor.

110 views 1 answer

asked Sep 21, 2017 by anonymous

In a thyristor D.C. chopper, which type of commutation results in best performance ?

In a thyristor D.C. chopper, which type of commutation results in best performance ?
Last Answer : voltage commutation

4.9k views 2 answers

asked Dec 31, 2017 by anonymous

For a class D commutation, answer the following: i) Explain the operation with circuit diagram. ii) Interpret with waveforms.

For a class D commutation, answer the following: i) Explain the operation with circuit diagram. ii) Interpret with waveforms.
Last Answer : Class D commutation: This is also called as auxiliary commutation because it uses an auxiliary SCR to switch the charged capacitor across conducting SCR to turn it off. In this scheme, the main ... make SCR1 forward biased and keep ready for next triggering. The above cyclic process is repeated.

195 views 1 answer

asked May 21, 2020 by anonymous

Draw circuit diagram of Class B commutation.

Draw circuit diagram of Class B commutation.
Last Answer : Class B: Resonant Pulse Commutation:

121 views 1 answer

asked May 21, 2020 by anonymous

Class A Load Commutation

Class A Load Commutation
Last Answer : Class A: Load Commutation: The class A or load commutation (also called self-commutation or resonant commutation) is employed in thyristor circuits supplied from DC source. The commutating components include ... biased. Thus the zero-current and reverse-bias cause the thyristor to turn-off.

178 views 1 answer

asked Oct 13, 2019 by anonymous

Differentiate between Natural and Forced commutation

Differentiate between Natural and Forced commutation
Last Answer : Natural commutation Forced commutation Source is AC Source is DC External commutating componants are not required External commutating componants are required SCR turns off ... in controlled rectifiers, AC voltage controllers etc. Used in choppers & inverters etc

1.9k views 1 answer

asked Oct 13, 2019 by anonymous

Class D commutation

Class D commutation
Last Answer : Class D commutation: This is also called as auxiliary commutation because it uses an auxiliary SCR to switch the charged capacitor across conducting SCR to turn it off. In this scheme, the main ... make SCR1 forward biased and keep ready for next triggering. The above cyclic process is repeated.

162 views 1 answer

asked Oct 13, 2019 by anonymous

Draw a neat circuit diagram of class F commutation

Draw a neat circuit diagram of class F commutation
Last Answer : class F commutation

111 views 1 answer

asked Oct 13, 2019 by anonymous

Explain auxiliary commutation with a neat diagram. Also draw its waveform.

Explain auxiliary commutation with a neat diagram. Also draw its waveform.
Last Answer : Auxiliary Commutation At start, the Ta is triggered and turned on to carry the load current. Due to the resonant circuit R-L-C, the current initially rises, attains peak and then falls to ... , the firing of auxiliary SCR commutates the main SCR, hence name is auxiliary commutation.

278 views 1 answer

asked Jul 25, 2019 by anonymous

Define commutation. Give the types of commutation.

Define commutation. Give the types of commutation.
Last Answer : Commutation: The process of turning-off a conducting thyristor is called commutation . Types of Commutation: i) Line commutation (Natural commutation) ii) Load commutation iii) Forced commutation iv) ... Auxiliary commutation v) Class E: External pulse commutation vi) Class F: AC line commutation

214 views 1 answer

asked Jul 25, 2019 by anonymous

In a 3-phase converter circuit during commutation when one SCR in one phase is turned on to turn-off an SCR

In a 3-phase converter circuit during commutation when one SCR in one phase is turned on to turn-off an SCR in another phase, results in (A) voltage notching (B) harmonic distortion (C) voltage sag (D) voltage swell
Last Answer : In a 3-phase converter circuit during commutation when one SCR in one phase is turned on to turn-off an SCR in another phase, results in voltage notching

174 views 1 answer

asked Apr 28, 2018 by anonymous

Satisfactory commutation of D.C. machines requires?

Last Answer : Satisfactory commutation of D.C. machines requires brushes should be of proper grade and size, brushes should smoothly run in the holders, smooth, concentric commutator properly undercut.

108 views 1 answer

asked Mar 20, 2018 by anonymous

thyristor have how many terminals?

Last Answer : Thyristor have three terminals anode, cathode and Gate.

58 views 1 answer

asked Sep 21, 2017 by anonymous

thyristor can be turned off by?

thyristor can be turned off by?
Last Answer : Thyristor can be turned off by making anode potential equal to cathode potential or by making anode potential less than cathode potential.

135 views 1 answer

asked Sep 10, 2017 by anonymous

why thyristor is called semi controlled device?

Last Answer : Thyristor can only be turned on by small gate pulse but it cannot be turn off by using gate hence thyristor is called semi controlled device.

1.1k views 1 answer

asked Sep 10, 2017 by anonymous

why thyristor is called latching device?

Last Answer : Thyristor can be turn on by positive gate pulse and the current will continue to flow through the device even when the gate voltage is low hence thyristor is called latching device.

918 views 1 answer

asked Sep 10, 2017 by anonymous

Describe the working principle of Thyristor operated dimmer with the help of circuit diagram.

Describe the working principle of Thyristor operated dimmer with the help of circuit diagram.
Last Answer : Thyristor operated dimmer: A popular thyristor operated dimmer circuit employ TRIAC-DIAC phase control for low AC power control. During each half-cycle, the capacitor charges through (R1+VR1). When the ... time constant {C (R1+VR1)}. Thus by reducing VR1 the lamp brightness can be increased.

368 views 1 answer

asked May 3, 2020 by anonymous

Thyristor can be protected from over voltages by using

Thyristor can be protected from over voltages by using
Last Answer : Thyristor can be protected from over voltages by using Voltage clamping device

108 views 1 answer

asked May 8, 2018 by anonymous

Leakage current flows through the thyristor in

Leakage current flows through the thyristor in
Last Answer : Leakage current flows through the thyristor in Forward blocking mode and Reverse blocking mode.

211 views 1 answer

asked May 8, 2018 by anonymous

What is a phase control thyristor?

153 views 0 answers