Emitter Current for UJT based Thyristor Firing Circuit Solution

STEP 0: Pre-Calculation Summary
Formula Used
Emitter Current = (Emitter Voltage-Diode Voltage)/(Emitter Resistance Base 1+Emitter Resistance)
IE = (VE-Vd)/(RB1+RE)
This formula uses 5 Variables
Variables Used
Emitter Current - (Measured in Ampere) - Emitter current is the amplified output current of a thyrsitor based circuit.
Emitter Voltage - (Measured in Volt) - Emitter Voltage is defined as the voltage across the emitter terminal of any transistor device.
Diode Voltage - (Measured in Volt) - Diode voltage is defined as the voltage developed across diode when it is in on state in a thyristor based circuit.
Emitter Resistance Base 1 - (Measured in Ohm) - Emitter resistance base 1 is the resistance offered to the current flowing through the base 1 junction on UJT.
Emitter Resistance - (Measured in Ohm) - Emitter Resistance is a dynamic resistance of the emitter-base junction diode of any thyristor based firing circuit.
STEP 1: Convert Input(s) to Base Unit
Emitter Voltage: 60 Volt --> 60 Volt No Conversion Required
Diode Voltage: 20 Volt --> 20 Volt No Conversion Required
Emitter Resistance Base 1: 18 Ohm --> 18 Ohm No Conversion Required
Emitter Resistance: 12 Ohm --> 12 Ohm No Conversion Required
STEP 2: Evaluate Formula
Substituting Input Values in Formula
IE = (VE-Vd)/(RB1+RE) --> (60-20)/(18+12)
Evaluating ... ...
IE = 1.33333333333333
STEP 3: Convert Result to Output's Unit
1.33333333333333 Ampere --> No Conversion Required
FINAL ANSWER
1.33333333333333 1.333333 Ampere <-- Emitter Current
(Calculation completed in 00.004 seconds)

Credits

Created by Parminder Singh
Chandigarh University (CU), Punjab
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Go Maximum Gate Voltage = (Peak Input Voltage*Stablizing Resistance)/(Variable Resistance+Thyristor Resistance+Stablizing Resistance)
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Go Firing Angle = Angular Frequency*Stablizing Resistance*Capacitance*ln(1/(1-Intrinsic Stand-off Ratio))
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Go Time Period of UJT as Oscillator = Stablizing Resistance*Capacitance*ln(1/(1-Intrinsic Stand-off Ratio))
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Go Maximum Gate Voltage = Gate Threshold Voltage/(sin(Angular Frequency*Time Period of Progressive Wave))
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Go Emitter Current = (Emitter Voltage-Diode Voltage)/(Emitter Resistance Base 1+Emitter Resistance)
Frequency of UJT as Oscillator Thyristor Firing Circuit
Go Frequency = 1/(Stablizing Resistance*Capacitance*ln(1/(1-Intrinsic Stand-off Ratio)))
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)
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

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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))
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Go Derating Factor of Thyristor String = 1-Resultant Series Voltage of Thyristor String/(Worst Case Steady State Voltage*Number of Thyristors in Series)
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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)))
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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)
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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
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Go Power Dissipated by Heat = (Junction Temperature-Ambient Temperature)/Thermal Resistance
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Go Thermal Resistance = (Junction Temperature-Ambient Temperature)/Power Dissipated by Heat
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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

Emitter Current for UJT based Thyristor Firing Circuit Formula

Emitter Current = (Emitter Voltage-Diode Voltage)/(Emitter Resistance Base 1+Emitter Resistance)
IE = (VE-Vd)/(RB1+RE)

Discuss the applications of UJT?

The most common application of a unijunction transistor is as a triggering device for SCR’s and Triacs but other UJT applications include sawtoothed generators, simple oscillators, phase control, and timing circuits. The simplest of all UJT circuits is the Relaxation Oscillator producing non-sinusoidal waveforms.

In a basic and typical UJT relaxation oscillator circuit, the Emitter terminal of the UJT is connected to the junction of a series connected resistor and capacitor.

How to Calculate Emitter Current for UJT based Thyristor Firing Circuit?

Emitter Current for UJT based Thyristor Firing Circuit calculator uses Emitter Current = (Emitter Voltage-Diode Voltage)/(Emitter Resistance Base 1+Emitter Resistance) to calculate the Emitter Current, The Emitter current for UJT based Thyristor firing circuit formula is defined as the magnitude of the current that flows through the emitter when it is in conducting mode. Emitter Current is denoted by IE symbol.

How to calculate Emitter Current for UJT based Thyristor Firing Circuit using this online calculator? To use this online calculator for Emitter Current for UJT based Thyristor Firing Circuit, enter Emitter Voltage (VE), Diode Voltage (Vd), Emitter Resistance Base 1 (RB1) & Emitter Resistance (RE) and hit the calculate button. Here is how the Emitter Current for UJT based Thyristor Firing Circuit calculation can be explained with given input values -> 1.333333 = (60-20)/(18+12).

FAQ

What is Emitter Current for UJT based Thyristor Firing Circuit?
The Emitter current for UJT based Thyristor firing circuit formula is defined as the magnitude of the current that flows through the emitter when it is in conducting mode and is represented as IE = (VE-Vd)/(RB1+RE) or Emitter Current = (Emitter Voltage-Diode Voltage)/(Emitter Resistance Base 1+Emitter Resistance). Emitter Voltage is defined as the voltage across the emitter terminal of any transistor device, Diode voltage is defined as the voltage developed across diode when it is in on state in a thyristor based circuit, Emitter resistance base 1 is the resistance offered to the current flowing through the base 1 junction on UJT & Emitter Resistance is a dynamic resistance of the emitter-base junction diode of any thyristor based firing circuit.
How to calculate Emitter Current for UJT based Thyristor Firing Circuit?
The Emitter current for UJT based Thyristor firing circuit formula is defined as the magnitude of the current that flows through the emitter when it is in conducting mode is calculated using Emitter Current = (Emitter Voltage-Diode Voltage)/(Emitter Resistance Base 1+Emitter Resistance). To calculate Emitter Current for UJT based Thyristor Firing Circuit, you need Emitter Voltage (VE), Diode Voltage (Vd), Emitter Resistance Base 1 (RB1) & Emitter Resistance (RE). With our tool, you need to enter the respective value for Emitter Voltage, Diode Voltage, Emitter Resistance Base 1 & Emitter Resistance 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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