Circuit Turn off Time Class B Commutation Calculator

✖Thyristor Commutation Capacitance refers to the capacitance present in a thyristor device that affects the commutation process.ⓘ Thyristor Commutation Capacitance [C_com]			+10% -10%
✖Thyristor commutation voltage is defined as the magnitude of voltage at which a thyristor gets commutated.ⓘ Thyristor Commutation Voltage [V_com]			+10% -10%
✖Load current is defined as the magnitude of the current drawn from an electric circuit by the load connected across a thyristor based circuit.ⓘ Load Current [I_L]			+10% -10%

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

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Formula

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Circuit Turn off Time Class B Commutation

Formula

`"t"_{"B(off)"} = "C"_{"com"}*"V"_{"com"}/"I"_{"L"}`

Example

`"1.646154s"="0.03F"*"42.8V"/"0.78A"`

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Circuit Turn off Time Class B Commutation Solution

STEP 0: Pre-Calculation Summary

Formula Used

Circuit Turn Off Time Class B Commutation = Thyristor Commutation Capacitance*Thyristor Commutation Voltage/Load Current
t_B(off) = C_com*V_com/I_L
This formula uses 4 Variables

Variables Used

Circuit Turn Off Time Class B Commutation - (Measured in Second) - Circuit turn off time Class B commutation is the time required by the thyristor circuit to turn off for class B commutation.
Thyristor Commutation Capacitance - (Measured in Farad) - Thyristor Commutation Capacitance refers to the capacitance present in a thyristor device that affects the commutation process.
Thyristor Commutation Voltage - (Measured in Volt) - Thyristor commutation voltage is defined as the magnitude of voltage at which a thyristor gets commutated.
Load Current - (Measured in Ampere) - Load current is defined as the magnitude of the current drawn from an electric circuit by the load connected across a thyristor based circuit.

STEP 1: Convert Input(s) to Base Unit

Thyristor Commutation Capacitance: 0.03 Farad --> 0.03 Farad No Conversion Required
Thyristor Commutation Voltage: 42.8 Volt --> 42.8 Volt No Conversion Required
Load Current: 0.78 Ampere --> 0.78 Ampere No Conversion Required

STEP 2: Evaluate Formula

Substituting Input Values in Formula

t_B(off) = C_com*V_com/I_L --> 0.03*42.8/0.78

Evaluating ... ...

t_B(off) = 1.64615384615385

STEP 3: Convert Result to Output's Unit

1.64615384615385 Second --> No Conversion Required

FINAL ANSWER

1.64615384615385 ≈ 1.646154 Second <-- Circuit Turn Off Time Class B Commutation

(Calculation completed in 00.004 seconds)

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Created by Parminder Singh

Chandigarh University (CU), Punjab

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< 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 B Commutation Formula

Circuit Turn Off Time Class B Commutation = Thyristor Commutation Capacitance*Thyristor Commutation Voltage/Load Current
t_B(off) = C_com*V_com/I_L

Explain Class B commutation in thyristors?

Class-B or Resonant Pulse Commutation is a forced commutation technique to turn off an SCR. In this technique, thyristor or SCR is turned off by gradual build-up of resonant current in the reverse direction i.e. from cathode to anode of SCR. This technique is also known as current commutation and occurs in DC circuit not in AC circuit.
The commutation circuit comprises of Capacitor C, Inductor L and an auxiliary thyristor TA. Initially thyristor T1 and TA are in off state and capacitor C is charged to voltage Vs with left hand plate positive.

How to Calculate Circuit Turn off Time Class B Commutation?

Circuit Turn off Time Class B Commutation calculator uses Circuit Turn Off Time Class B Commutation = Thyristor Commutation Capacitance*Thyristor Commutation Voltage/Load Current to calculate the Circuit Turn Off Time Class B Commutation, The Circuit turn off time Class B commutation formula is defined as the time required by the thyristor circuit to turn off for class B commutation. Circuit Turn Off Time Class B Commutation is denoted by t_B(off) symbol.

How to calculate Circuit Turn off Time Class B Commutation using this online calculator? To use this online calculator for Circuit Turn off Time Class B Commutation, enter Thyristor Commutation Capacitance (C_com), Thyristor Commutation Voltage (V_com) & Load Current (I_L) and hit the calculate button. Here is how the Circuit Turn off Time Class B Commutation calculation can be explained with given input values -> 1.646154 = 0.03*42.8/0.78.

FAQ

What is Circuit Turn off Time Class B Commutation?

The Circuit turn off time Class B commutation formula is defined as the time required by the thyristor circuit to turn off for class B commutation and is represented as t_B(off) = C_com*V_com/I_L or Circuit Turn Off Time Class B Commutation = Thyristor Commutation Capacitance*Thyristor Commutation Voltage/Load Current. Thyristor Commutation Capacitance refers to the capacitance present in a thyristor device that affects the commutation process, Thyristor commutation voltage is defined as the magnitude of voltage at which a thyristor gets commutated & Load current is defined as the magnitude of the current drawn from an electric circuit by the load connected across a thyristor based circuit.

How to calculate Circuit Turn off Time Class B Commutation?

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

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