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## Peak current Class B thyristor commutation Solution

STEP 0: Pre-Calculation Summary
Formula Used
Peak Current = Source voltage*(sqrt(Capacitance/Inductance))
Io = Vs*(sqrt(C/L))
This formula uses 1 Functions, 3 Variables
Functions Used
sqrt - Squre root function, sqrt(Number)
Variables Used
Source voltage - Source voltage A voltage source is a two-terminal device that can maintain a fixed voltage. (Measured in Volt)
Capacitance - Capacitance is the ratio of the amount of electric charge stored on a conductor to a difference in electric potential. (Measured in Farad)
Inductance - Inductance is the tendency of an electric conductor to oppose a change in the electric current flowing through it. (Measured in Henry)
STEP 1: Convert Input(s) to Base Unit
Source voltage: 9 Volt --> 9 Volt No Conversion Required
Inductance: 5 Henry --> 5 Henry No Conversion Required
STEP 2: Evaluate Formula
Substituting Input Values in Formula
Io = Vs*(sqrt(C/L)) --> 9*(sqrt(3/5))
Evaluating ... ...
Io = 6.97137002317335
STEP 3: Convert Result to Output's Unit
6.97137002317335 Ampere --> No Conversion Required
6.97137002317335 Ampere <-- Peak Current
(Calculation completed in 00.000 seconds)

## < 10+ Thyristors Calculators

Excess work due to thyristor 1 in chopper circuit
Excess energy in chopper circuit = 0.5*Reverse di/dt limiting inductance*((Load current of chopper circuit+(Reverse recovery time*Commutation capacitor voltage)/Reverse di/dt limiting inductance)-(Load current of chopper circuit^2)) Go
Worst case steady state voltage across first thyristor in series connected thyristors
Worst case steady state voltage of thyristor 1 = ((Resultant series voltage of thyristor string+(Number of thyristors in series thyristor string-1)*Resistance*Off state current spread of thyristor string))/Number of thyristors in series thyristor string Go
Voltage across first thyristor in series-connected thyristors
Voltage across thyristor 1 in thyristor string = (Resultant series voltage of thyristor string+(Number of thyristors in series thyristor string-1)*Resistance*Off state current spread of thyristor string)/Number of thyristors in series thyristor string Go
Resultant series voltage of series connected thyristor string
Resultant series voltage of thyristor string = Number of thyristors in series thyristor string*Voltage across thyristor 1 in thyristor string-(Number of thyristors in series thyristor string-1)*Resistance*Off state current spread of thyristor string Go
Maximum Thyristor gate voltage for resistance firing circuit
Maximum gate voltage = Maximum AC input voltage*(Stabilizing Resistance/(Stabilizing Resistance+Variable Resistance+Resistance)) Go
Derating factor of series connected thyristor string
Derating factor of thyristor string = 1-(Resultant series voltage of thyristor string/(Number of thyristors in series thyristor string*Worst case steady state voltage of thyristor 1)) Go
Power dissipated by heat in SCR
Power dissipated by heat in SCR = (SCR junction temperature-SCR ambient temperature)/Thermal resistance of SCR Go
Thermal resistance of SCR
Thermal resistance of SCR = (SCR junction temperature-SCR ambient temperature)/Power dissipated by heat in SCR Go
Leakage current of the collector-base junction
Collector to base leakage current = Collector current-Common base current gain of transistor*Emitter current Go
Discharging current of dv/dt protection thyristor circuits
Discharging current of thyristor circuit = Input voltage/((Resistance+Resistance)) Go

### Peak current Class B thyristor commutation Formula

Peak Current = Source voltage*(sqrt(Capacitance/Inductance))
Io = Vs*(sqrt(C/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 = Source voltage*(sqrt(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 Io 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 Source voltage (Vs), Capacitance (C) & 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 -> 6.97137 = 9*(sqrt(3/5)).

### 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 Io = Vs*(sqrt(C/L)) or Peak Current = Source voltage*(sqrt(Capacitance/Inductance)). Source voltage A voltage source is a two-terminal device that can maintain a fixed voltage, Capacitance is the ratio of the amount of electric charge stored on a conductor to a difference in electric potential & Inductance is the tendency of an electric conductor to oppose a change in the electric current flowing through it.
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 = Source voltage*(sqrt(Capacitance/Inductance)). To calculate Peak current Class B thyristor commutation, you need Source voltage (Vs), Capacitance (C) & Inductance (L). With our tool, you need to enter the respective value for Source voltage, Capacitance & Inductance and hit the calculate button. You can also select the units (if any) for Input(s) and the Output as well. Let Others Know