Circuit Turn off Time Class C Commutation Calculator

✖Stablizing Resistance is defined as the opposition faced by the flow of current through a thyristor based circuit which is used to stablize.ⓘ Stablizing Resistance [R_stb]			+10% -10%
✖Thyristor Commutation Capacitance refers to the capacitance present in a thyristor device that affects the commutation process.ⓘ Thyristor Commutation Capacitance [C_com]			+10% -10%

✖Circuit turn off time Class C commutation is the time required by the thyristor circuit to turn off for class C commutation.ⓘ Circuit Turn off Time Class C Commutation [t_C(off)]

⎘ Copy

👎

Formula

✖

Circuit Turn off Time Class C Commutation

Formula

`"t"_{"C(off)"} = "R"_{"stb"}*"C"_{"com"}*ln(2)`

Example

`"0.665421s"="32Ω"*"0.03F"*ln(2)`

Calculator

LaTeX

Reset

👍

Download Silicon Controlled Rectifier Formula PDF PDF Image

Circuit Turn off Time Class C Commutation Solution

STEP 0: Pre-Calculation Summary

Formula Used

Circuit Turn Off Time Class C Commutation = Stablizing Resistance*Thyristor Commutation Capacitance*ln(2)
t_C(off) = R_stb*C_com*ln(2)
This formula uses 1 Functions, 3 Variables

Functions Used

ln - The natural logarithm, also known as the logarithm to the base e, is the inverse function of the natural exponential function., ln(Number)

Variables Used

Circuit Turn Off Time Class C Commutation - (Measured in Second) - Circuit turn off time Class C commutation is the time required by the thyristor circuit to turn off for class C commutation.
Stablizing Resistance - (Measured in Ohm) - Stablizing Resistance is defined as the opposition faced by the flow of current through a thyristor based circuit which is used to stablize.
Thyristor Commutation Capacitance - (Measured in Farad) - Thyristor Commutation Capacitance refers to the capacitance present in a thyristor device that affects the commutation process.

STEP 1: Convert Input(s) to Base Unit

Stablizing Resistance: 32 Ohm --> 32 Ohm No Conversion Required
Thyristor Commutation Capacitance: 0.03 Farad --> 0.03 Farad No Conversion Required

STEP 2: Evaluate Formula

Substituting Input Values in Formula

t_C(off) = R_stb*C_com*ln(2) --> 32*0.03*ln(2)

Evaluating ... ...

t_C(off) = 0.665421293337547

STEP 3: Convert Result to Output's Unit

0.665421293337547 Second --> No Conversion Required

FINAL ANSWER

0.665421293337547 ≈ 0.665421 Second <-- Circuit Turn Off Time Class C Commutation

(Calculation completed in 00.004 seconds)

You are here -

Home » Engineering » Electrical » Power Electronics » Silicon Controlled Rectifier » SCR/Thyristor Commutation » Circuit Turn off Time Class C Commutation

Credits

Created by Parminder Singh

Chandigarh University (CU), Punjab

Parminder Singh has created this Calculator and 100+ more calculators!

Verified by Rachita C

BMS College Of Engineering (BMSCE), Banglore

Rachita C has verified this Calculator and 50+ more calculators!

< 5 SCR/Thyristor Commutation Calculators

Thyristor Commutation Voltage for Class B Commutation

Go Thyristor Commutation Voltage = Input Voltage*cos(Angular Frequency*(Thyristor Reverse Bias Time-Auxiliary Thyristor Reverse Bias Time))

Circuit Turn off Time Class B Commutation

Go Circuit Turn Off Time Class B Commutation = Thyristor Commutation Capacitance*Thyristor Commutation Voltage/Load Current

Thyristor Conduction Time for Class A Commutation

Go Thyristor Conduction Time = pi*sqrt(Inductance*Thyristor Commutation Capacitance)

Peak Current Class B Thyristor Commutation

Go Peak Current = Input Voltage*sqrt(Thyristor Commutation Capacitance/Inductance)

Circuit Turn off Time Class C Commutation

Go Circuit Turn Off Time Class C Commutation = Stablizing Resistance*Thyristor Commutation Capacitance*ln(2)

< 16 SCR Characteristics Calculators

Worst Case Steady State Voltage across First Thyristor in Series Connected Thyristors

Go Worst Case Steady State Voltage = (Resultant Series Voltage of Thyristor String+Stablizing Resistance*(Number of Thyristors in Series-1)*Off State Current Spread)/Number of Thyristors in Series

Thyristor Commutation Voltage for Class B Commutation

Go Thyristor Commutation Voltage = Input Voltage*cos(Angular Frequency*(Thyristor Reverse Bias Time-Auxiliary Thyristor Reverse Bias Time))

Derating Factor of Series Connected Thyristor String

Go Derating Factor of Thyristor String = 1-Resultant Series Voltage of Thyristor String/(Worst Case Steady State Voltage*Number of Thyristors in Series)

Time Period for UJT as Oscillator Thyristor Firing Circuit

Go Time Period of UJT as Oscillator = Stablizing Resistance*Capacitance*ln(1/(1-Intrinsic Stand-off Ratio))

Emitter Current for UJT based Thyristor Firing Circuit

Go Emitter Current = (Emitter Voltage-Diode Voltage)/(Emitter Resistance Base 1+Emitter Resistance)

Circuit Turn off Time Class B Commutation

Go Circuit Turn Off Time Class B Commutation = Thyristor Commutation Capacitance*Thyristor Commutation Voltage/Load Current

Frequency of UJT as Oscillator Thyristor Firing Circuit

Go Frequency = 1/(Stablizing Resistance*Capacitance*ln(1/(1-Intrinsic Stand-off Ratio)))

Thyristor Conduction Time for Class A Commutation

Go Thyristor Conduction Time = pi*sqrt(Inductance*Thyristor Commutation Capacitance)

Peak Current Class B Thyristor Commutation

Go Peak Current = Input Voltage*sqrt(Thyristor Commutation Capacitance/Inductance)

Intrinsic Stand-off Ratio for UJT based Thyristor Firing Circuit

Go Intrinsic Stand-off Ratio = Emitter Resistance Base 1/(Emitter Resistance Base 1+Emitter Resistance Base 2)

Circuit Turn off Time Class C Commutation

Go Circuit Turn Off Time Class C Commutation = Stablizing Resistance*Thyristor Commutation Capacitance*ln(2)

Leakage Current of Collector-Base Junction

Go Collector Base Leakage Current = Collector Current-Common-Base Current Gain*Collector Current

Power Dissipated by Heat in SCR

Go Power Dissipated by Heat = (Junction Temperature-Ambient Temperature)/Thermal Resistance

Thermal Resistance of SCR

Go Thermal Resistance = (Junction Temperature-Ambient Temperature)/Power Dissipated by Heat

Discharging Current of dv-dt Protection Thyristor Circuits

Go Discharging Current = Input Voltage/((Resistance 1+Resistance 2))

Emitter Voltage to Turn On UJT based Thyristor Firing Circuit

Go Emitter Voltage = Emitter Resistance Base 1 Voltage+Diode Voltage

Circuit Turn off Time Class C Commutation Formula

Circuit Turn Off Time Class C Commutation = Stablizing Resistance*Thyristor Commutation Capacitance*ln(2)
t_C(off) = R_stb*C_com*ln(2)

Explain Class C commutation on thyristors?

A sub-classification of forced commutation in which the device is commutated by transferring the load current of the main thyristor to another thyristor in the circuit is Class C Commutation of the Thyristor. Another name for this type of commutation is complementary commutation.
This commutation technique makes use of two thyristors, one is main and another is auxiliary (complimentary). The main thyristor is denoted as T1 while the complementary thyristor is T2. The main thyristor is serially connected with the load while the auxiliary one is parallelly connected with the main thyristor.

It is given the name complementary commutation due to the reason that the two thyristors in the circuit get on alternatively. This means that to turn the thyristor off, the auxiliary thyristor is triggered whereas to turn off the auxiliary thyristor, T1 is triggered.

How to Calculate Circuit Turn off Time Class C Commutation?

Circuit Turn off Time Class C Commutation calculator uses Circuit Turn Off Time Class C Commutation = Stablizing Resistance*Thyristor Commutation Capacitance*ln(2) to calculate the Circuit Turn Off Time Class C Commutation, The Circuit turn off time Class C commutation formula is defined as the time required by the thyristor circuit to turn off for class C commutation. Circuit Turn Off Time Class C Commutation is denoted by t_C(off) symbol.

How to calculate Circuit Turn off Time Class C Commutation using this online calculator? To use this online calculator for Circuit Turn off Time Class C Commutation, enter Stablizing Resistance (R_stb) & Thyristor Commutation Capacitance (C_com) and hit the calculate button. Here is how the Circuit Turn off Time Class C Commutation calculation can be explained with given input values -> 0.665421 = 32*0.03*ln(2).

FAQ

What is Circuit Turn off Time Class C Commutation?

The Circuit turn off time Class C commutation formula is defined as the time required by the thyristor circuit to turn off for class C commutation and is represented as t_C(off) = R_stb*C_com*ln(2) or Circuit Turn Off Time Class C Commutation = Stablizing Resistance*Thyristor Commutation Capacitance*ln(2). Stablizing Resistance is defined as the opposition faced by the flow of current through a thyristor based circuit which is used to stablize & Thyristor Commutation Capacitance refers to the capacitance present in a thyristor device that affects the commutation process.

How to calculate Circuit Turn off Time Class C Commutation?

The Circuit turn off time Class C commutation formula is defined as the time required by the thyristor circuit to turn off for class C commutation is calculated using Circuit Turn Off Time Class C Commutation = Stablizing Resistance*Thyristor Commutation Capacitance*ln(2). To calculate Circuit Turn off Time Class C Commutation, you need Stablizing Resistance (R_stb) & Thyristor Commutation Capacitance (C_com). With our tool, you need to enter the respective value for Stablizing Resistance & Thyristor Commutation Capacitance and hit the calculate button. You can also select the units (if any) for Input(s) and the Output as well.

Home

FREE PDFs

🔍 Search