Peak Current Class B Thyristor Commutation Calculator

✖Input Voltage is defined as the voltage applied at the input terminal in a thyristor based circuit.ⓘ Input Voltage [V_in]			+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%
✖Inductance is the tendency of an electric conductor to oppose a change in the electric current flowing in a thyrsitor commutation circuit.ⓘ Inductance [L]			+10% -10%

✖Peak Current is the maximum amount of current by which output is capable of sourcing for brief periods of time.ⓘ Peak Current Class B Thyristor Commutation [I_o]

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Formula

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Peak Current Class B Thyristor Commutation

Formula

`"I"_{"o"} = "V"_{"in"}*sqrt("C"_{"com"}/"L")`

Example

`"11.49196A"="45V"*sqrt("0.03F"/"0.46H")`

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Peak Current Class B Thyristor Commutation Solution

STEP 0: Pre-Calculation Summary

Formula Used

Peak Current = Input Voltage*sqrt(Thyristor Commutation Capacitance/Inductance)
I_o = V_in*sqrt(C_com/L)
This formula uses 1 Functions, 4 Variables

Functions Used

sqrt - A square root function is a function that takes a non-negative number as an input and returns the square root of the given input number., sqrt(Number)

Variables Used

Peak Current - (Measured in Ampere) - Peak Current is the maximum amount of current by which output is capable of sourcing for brief periods of time.
Input Voltage - (Measured in Volt) - Input Voltage is defined as the voltage applied at the input terminal in a thyristor based circuit.
Thyristor Commutation Capacitance - (Measured in Farad) - Thyristor Commutation Capacitance refers to the capacitance present in a thyristor device that affects the commutation process.
Inductance - (Measured in Henry) - Inductance is the tendency of an electric conductor to oppose a change in the electric current flowing in a thyrsitor commutation circuit.

STEP 1: Convert Input(s) to Base Unit

Input Voltage: 45 Volt --> 45 Volt No Conversion Required
Thyristor Commutation Capacitance: 0.03 Farad --> 0.03 Farad No Conversion Required
Inductance: 0.46 Henry --> 0.46 Henry No Conversion Required

STEP 2: Evaluate Formula

Substituting Input Values in Formula

I_o = V_in*sqrt(C_com/L) --> 45*sqrt(0.03/0.46)

Evaluating ... ...

I_o = 11.4919631652431

STEP 3: Convert Result to Output's Unit

11.4919631652431 Ampere --> No Conversion Required

FINAL ANSWER

11.4919631652431 ≈ 11.49196 Ampere <-- Peak Current

(Calculation completed in 00.004 seconds)

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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

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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

Peak Current Class B Thyristor Commutation Formula

Peak Current = Input Voltage*sqrt(Thyristor Commutation Capacitance/Inductance)
I_o = V_in*sqrt(C_com/L)

Explain the working of Class B commutation?

At t=0, the main thyristor / SCR is gated and turned on. Load current equal to I0 starts flowing through the main thyristor T1 and Load. Now, we want to turn this thyristor off. To do this, we fire the auxiliary thyristor TA at t=t1. Till time t=t1, the capacitor is charged with source voltage Vs i.e. vc = Vs, capacitor current ic = 0 and current through main thyristor T1 i.e. i0 = I0.
The current through TA is zero at t=t2 and if it gets reversed biased after t=t2 then TA will get turned off. The voltage across TA equals the voltage across capacitor.
When the magnitude of ic reaches I0, the current through the SCR T1 will become zero. This can be seen at t=t3. Main thyristor T1 will turn off at t=t3 as the current through it is zero and it is reversed biased after this instant of time.

How to Calculate Peak Current Class B Thyristor Commutation?

Peak Current Class B Thyristor Commutation calculator uses Peak Current = Input Voltage*sqrt(Thyristor Commutation Capacitance/Inductance) to calculate the Peak Current, The Peak current Class B thyristor commutation formula is defined as the maximum magnitude of the current across a thyristor when it is undergoing the process of commutation. Peak Current is denoted by I_o symbol.

How to calculate Peak Current Class B Thyristor Commutation using this online calculator? To use this online calculator for Peak Current Class B Thyristor Commutation, enter Input Voltage (V_in), Thyristor Commutation Capacitance (C_com) & Inductance (L) and hit the calculate button. Here is how the Peak Current Class B Thyristor Commutation calculation can be explained with given input values -> 11.49196 = 45*sqrt(0.03/0.46).

FAQ

What is Peak Current Class B Thyristor Commutation?

The Peak current Class B thyristor commutation formula is defined as the maximum magnitude of the current across a thyristor when it is undergoing the process of commutation and is represented as I_o = V_in*sqrt(C_com/L) or Peak Current = Input Voltage*sqrt(Thyristor Commutation Capacitance/Inductance). Input Voltage is defined as the voltage applied at the input terminal in a thyristor based circuit, Thyristor Commutation Capacitance refers to the capacitance present in a thyristor device that affects the commutation process & Inductance is the tendency of an electric conductor to oppose a change in the electric current flowing in a thyrsitor commutation circuit.

How to calculate Peak Current Class B Thyristor Commutation?

The Peak current Class B thyristor commutation formula is defined as the maximum magnitude of the current across a thyristor when it is undergoing the process of commutation is calculated using Peak Current = Input Voltage*sqrt(Thyristor Commutation Capacitance/Inductance). To calculate Peak Current Class B Thyristor Commutation, you need Input Voltage (V_in), Thyristor Commutation Capacitance (C_com) & Inductance (L). With our tool, you need to enter the respective value for Input Voltage, Thyristor Commutation Capacitance & Inductance 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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