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## Circuit turn off time Class C commutation Solution

STEP 0: Pre-Calculation Summary
Formula Used
Circuit turn off time Class C commutation = (Resistance*Capacitance)*ln(2)
toff = (R*C)*ln(2)
This formula uses 1 Functions, 2 Variables
Functions Used
ln - Natural logarithm function (base e), ln(Number)
Variables Used
Resistance - Resistance is a measure of the opposition to current flow in an electrical circuit. Its S.I unit is ohm. (Measured in Ohm)
Capacitance - Capacitance is the ratio of the amount of electric charge stored on a conductor to a difference in electric potential. (Measured in Farad)
STEP 1: Convert Input(s) to Base Unit
Resistance: 10 Ohm --> 10 Ohm No Conversion Required
STEP 2: Evaluate Formula
Substituting Input Values in Formula
toff = (R*C)*ln(2) --> (10*3)*ln(2)
Evaluating ... ...
toff = 20.7944154167984
STEP 3: Convert Result to Output's Unit
20.7944154167984 Second --> No Conversion Required
20.7944154167984 Second <-- Circuit turn off time Class C commutation
(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

### Circuit turn off time Class C commutation Formula

Circuit turn off time Class C commutation = (Resistance*Capacitance)*ln(2)
toff = (R*C)*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 = (Resistance*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 toff 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 Resistance (R) & Capacitance (C) and hit the calculate button. Here is how the Circuit turn off time Class C commutation calculation can be explained with given input values -> 20.79442 = (10*3)*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 toff = (R*C)*ln(2) or Circuit turn off time Class C commutation = (Resistance*Capacitance)*ln(2). Resistance is a measure of the opposition to current flow in an electrical circuit. Its S.I unit is ohm & Capacitance is the ratio of the amount of electric charge stored on a conductor to a difference in electric potential.
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 = (Resistance*Capacitance)*ln(2). To calculate Circuit turn off time Class C commutation, you need Resistance (R) & Capacitance (C). With our tool, you need to enter the respective value for Resistance & Capacitance 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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