Maximum Thyristor gate voltage for resistance firing circuit Solution

STEP 0: Pre-Calculation Summary
Formula Used
Maximum gate voltage = Maximum AC input voltage*(Stabilizing Resistance/(Stabilizing Resistance+Variable Resistance+Resistance))
Vg(max) = Vmax*(R2/(R2+R+R))
This formula uses 5 Variables
Variables Used
Maximum gate voltage - (Measured in Volt) - Maximum gate voltage is the maximum amplitude of the gate voltage to trigger a Thyristor.
Maximum AC input voltage - (Measured in Volt) - Maximum AC input voltage is the peak of the alternating voltage provided at the input of any electrical circuit.
Stabilizing Resistance - (Measured in Ohm) - Stabilizing resistance is to prevent the relay from operating due to saturation of the current during transistors and thyristor start-up.
Variable Resistance - (Measured in Ohm) - Variable Resistance is defined as the resistors who resistance can be varied at any instant.
Resistance - (Measured in Ohm) - Resistance is a measure of the opposition to current flow in an electrical circuit. Its S.I unit is ohm.
STEP 1: Convert Input(s) to Base Unit
Maximum AC input voltage: 220 Volt --> 220 Volt No Conversion Required
Stabilizing Resistance: 5 Ohm --> 5 Ohm No Conversion Required
Variable Resistance: 10 Ohm --> 10 Ohm No Conversion Required
Resistance: 10.1 Ohm --> 10.1 Ohm No Conversion Required
STEP 2: Evaluate Formula
Substituting Input Values in Formula
Vg(max) = Vmax*(R2/(R2+R+R)) --> 220*(5/(5+10+10.1))
Evaluating ... ...
Vg(max) = 43.8247011952191
STEP 3: Convert Result to Output's Unit
43.8247011952191 Volt -->43824.7011952191 Millivolt (Check conversion here)
FINAL ANSWER
43824.7011952191 Millivolt <-- Maximum gate voltage
(Calculation completed in 00.016 seconds)

Credits

Created by Parminder Singh
Chandigarh University (CU), Punjab
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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
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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
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Power dissipated by heat in SCR = (SCR junction temperature-SCR ambient temperature)/Thermal resistance of SCR Go
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Maximum Thyristor gate voltage for resistance firing circuit Formula

Maximum gate voltage = Maximum AC input voltage*(Stabilizing Resistance/(Stabilizing Resistance+Variable Resistance+Resistance))
Vg(max) = Vmax*(R2/(R2+R+R))

What is a resistance firing circuit?

the resistance triggering of SCR where it is employed to drive the load from the input AC supply. Resistance and diode combination circuit acts as a gate control circuitry to switch the SCR in the desired condition.
As the positive voltage applied, the SCR is forward biased and doesn’t conduct until its gate current is more than minimum gate current of the SCR. In this, the triggering angle is limited to 90 degrees only. Because the applied voltage is maximum at 90 degrees so the gate current has to reach minimum gate current value somewhere between zero to 90 degrees. It is the simplest and economical type of triggering but limited for few applications due to its disadvantages.

How to Calculate Maximum Thyristor gate voltage for resistance firing circuit?

Maximum Thyristor gate voltage for resistance firing circuit calculator uses Maximum gate voltage = Maximum AC input voltage*(Stabilizing Resistance/(Stabilizing Resistance+Variable Resistance+Resistance)) to calculate the Maximum gate voltage, The Maximum Thyristor gate voltage for resistance firing circuit formula is defined as the maximum amplitude of the gate voltage to trigger a Thyristor. Maximum gate voltage is denoted by Vg(max) symbol.

How to calculate Maximum Thyristor gate voltage for resistance firing circuit using this online calculator? To use this online calculator for Maximum Thyristor gate voltage for resistance firing circuit, enter Maximum AC input voltage (Vmax), Stabilizing Resistance (R2), Variable Resistance (R) & Resistance (R) and hit the calculate button. Here is how the Maximum Thyristor gate voltage for resistance firing circuit calculation can be explained with given input values -> 43824.7 = 220*(5/(5+10+10.1)).

FAQ

What is Maximum Thyristor gate voltage for resistance firing circuit?
The Maximum Thyristor gate voltage for resistance firing circuit formula is defined as the maximum amplitude of the gate voltage to trigger a Thyristor and is represented as Vg(max) = Vmax*(R2/(R2+R+R)) or Maximum gate voltage = Maximum AC input voltage*(Stabilizing Resistance/(Stabilizing Resistance+Variable Resistance+Resistance)). Maximum AC input voltage is the peak of the alternating voltage provided at the input of any electrical circuit, Stabilizing resistance is to prevent the relay from operating due to saturation of the current during transistors and thyristor start-up, Variable Resistance is defined as the resistors who resistance can be varied at any instant & Resistance is a measure of the opposition to current flow in an electrical circuit. Its S.I unit is ohm.
How to calculate Maximum Thyristor gate voltage for resistance firing circuit?
The Maximum Thyristor gate voltage for resistance firing circuit formula is defined as the maximum amplitude of the gate voltage to trigger a Thyristor is calculated using Maximum gate voltage = Maximum AC input voltage*(Stabilizing Resistance/(Stabilizing Resistance+Variable Resistance+Resistance)). To calculate Maximum Thyristor gate voltage for resistance firing circuit, you need Maximum AC input voltage (Vmax), Stabilizing Resistance (R2), Variable Resistance (R) & Resistance (R). With our tool, you need to enter the respective value for Maximum AC input voltage, Stabilizing Resistance, Variable Resistance & Resistance and hit the calculate button. You can also select the units (if any) for Input(s) and the Output as well.
How many ways are there to calculate Maximum gate voltage?
In this formula, Maximum gate voltage uses Maximum AC input voltage, Stabilizing Resistance, Variable Resistance & Resistance. We can use 1 other way(s) to calculate the same, which is/are as follows -
  • Maximum gate voltage = Gate threshold voltage/(sin(Angular Frequency in Radians/sec*Time Period of Progressive Wave))
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