Frequency of UJT as Oscillator Thyristor Firing Circuit Solution

STEP 0: Pre-Calculation Summary
Formula Used
Frequency = 1/(Stablizing Resistance*Capacitance*ln(1/(1-Intrinsic Stand-off Ratio)))
f = 1/(Rstb*C*ln(1/(1-η)))
This formula uses 1 Functions, 4 Variables
Functions Used
ln - The natural logarithm, also known as the logarithm to the base e, is the inverse function of the natural exponential function., ln(Number)
Variables Used
Frequency - (Measured in Hertz) - Frequency of UJT as Oscillator is the frequency of the UJT based relaxation oscillator.
Stablizing Resistance - (Measured in Ohm) - Stablizing Resistance is defined as the opposition faced by the flow of current through a thyristor based circuit which is used to stablize.
Capacitance - (Measured in Farad) - Capacitance is the ratio of the amount of electric charge stored on a conductor to a difference in electric potential for any thyristor circuit.
Intrinsic Stand-off Ratio - Intrinsic stand-off ratio UJT as Oscillator is defined as the ratio of emitter base 1 resistance to the total emitter base junctions resistances.
STEP 1: Convert Input(s) to Base Unit
Stablizing Resistance: 32 Ohm --> 32 Ohm No Conversion Required
Capacitance: 0.3 Farad --> 0.3 Farad No Conversion Required
Intrinsic Stand-off Ratio: 0.529 --> No Conversion Required
STEP 2: Evaluate Formula
Substituting Input Values in Formula
f = 1/(Rstb*C*ln(1/(1-η))) --> 1/(32*0.3*ln(1/(1-0.529)))
Evaluating ... ...
f = 0.138354437693122
STEP 3: Convert Result to Output's Unit
0.138354437693122 Hertz --> No Conversion Required
FINAL ANSWER
0.138354437693122 0.138354 Hertz <-- Frequency
(Calculation completed in 00.019 seconds)

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Chandigarh University (CU), Punjab
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10+ SCR Firing Circuit Calculators

Thyristor Firing Angle for RC Firing Circuit
Go Firing Angle = asin(Gate Threshold Voltage*((Stablizing Resistance+Variable Resistance+Thyristor Resistance)/(Peak Input Voltage*Stablizing Resistance)))
Peak Thyristor Gate Voltage for Resistance Firing Circuit
Go Maximum Gate Voltage = (Peak Input Voltage*Stablizing Resistance)/(Variable Resistance+Thyristor Resistance+Stablizing Resistance)
Firing Angle of UJT as Oscillator Thyristor Firing Circuit
Go Firing Angle = Angular Frequency*Stablizing Resistance*Capacitance*ln(1/(1-Intrinsic Stand-off Ratio))
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))
Peak Thyristor Gate Voltage for RC Firing Circuit
Go Maximum Gate Voltage = Gate Threshold Voltage/(sin(Angular Frequency*Time Period of Progressive Wave))
Emitter Current for UJT based Thyristor Firing Circuit
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

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

Frequency of UJT as Oscillator Thyristor Firing Circuit Formula

Frequency = 1/(Stablizing Resistance*Capacitance*ln(1/(1-Intrinsic Stand-off Ratio)))
f = 1/(Rstb*C*ln(1/(1-η)))

What is an UJT?

The UJT or uni junction transistor is a semiconductor device that has only one junction. The UJT has three terminals designated B1, B2 and E. The base material for a UJT is a lightly doped N-Type Silicon bar with ohmic contacts given at the lengthwise ends. These end terminals are called B1 and B2. Since the silicon bar is lightly doped, the resistance between B1 and B2 is very high (typically 5 to 10 KΩ). A heavily doped P-type region is constructed on one side of the bar close to the B2 region. This heavily doped P region is called emitter and it is designated as E. Resistance between E & B1 is higher than the resistance between E & B2 because E is constructed close to B2.

How to Calculate Frequency of UJT as Oscillator Thyristor Firing Circuit?

Frequency of UJT as Oscillator Thyristor Firing Circuit calculator uses Frequency = 1/(Stablizing Resistance*Capacitance*ln(1/(1-Intrinsic Stand-off Ratio))) to calculate the Frequency, The Frequency of UJT as Oscillator Thyristor Firing Circuit formula is defined as the frequency of the UJT based relaxation oscillator at which it oscillates. Frequency is denoted by f symbol.

How to calculate Frequency of UJT as Oscillator Thyristor Firing Circuit using this online calculator? To use this online calculator for Frequency of UJT as Oscillator Thyristor Firing Circuit, enter Stablizing Resistance (Rstb), Capacitance (C) & Intrinsic Stand-off Ratio (η) and hit the calculate button. Here is how the Frequency of UJT as Oscillator Thyristor Firing Circuit calculation can be explained with given input values -> 0.138354 = 1/(32*0.3*ln(1/(1-0.529))).

FAQ

What is Frequency of UJT as Oscillator Thyristor Firing Circuit?
The Frequency of UJT as Oscillator Thyristor Firing Circuit formula is defined as the frequency of the UJT based relaxation oscillator at which it oscillates and is represented as f = 1/(Rstb*C*ln(1/(1-η))) or Frequency = 1/(Stablizing Resistance*Capacitance*ln(1/(1-Intrinsic Stand-off Ratio))). Stablizing Resistance is defined as the opposition faced by the flow of current through a thyristor based circuit which is used to stablize, Capacitance is the ratio of the amount of electric charge stored on a conductor to a difference in electric potential for any thyristor circuit & Intrinsic stand-off ratio UJT as Oscillator is defined as the ratio of emitter base 1 resistance to the total emitter base junctions resistances.
How to calculate Frequency of UJT as Oscillator Thyristor Firing Circuit?
The Frequency of UJT as Oscillator Thyristor Firing Circuit formula is defined as the frequency of the UJT based relaxation oscillator at which it oscillates is calculated using Frequency = 1/(Stablizing Resistance*Capacitance*ln(1/(1-Intrinsic Stand-off Ratio))). To calculate Frequency of UJT as Oscillator Thyristor Firing Circuit, you need Stablizing Resistance (Rstb), Capacitance (C) & Intrinsic Stand-off Ratio (η). With our tool, you need to enter the respective value for Stablizing Resistance, Capacitance & Intrinsic Stand-off Ratio 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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