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## Time period for UJT as an oscillator Thyristor firing circuit Solution

STEP 0: Pre-Calculation Summary
Formula Used
Time period of UJT as an Oscillator = (Resistance*Capacitance)*ln(1/(1-Intrinsic stand-off ratio UJT as Oscillator))
TUJT(osc) = (R*C)*ln(1/(1-η))
This formula uses 1 Functions, 3 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)
Intrinsic stand-off ratio UJT as Oscillator- 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
Resistance: 10 Ohm --> 10 Ohm No Conversion Required
Intrinsic stand-off ratio UJT as Oscillator: 0.5 --> No Conversion Required
STEP 2: Evaluate Formula
Substituting Input Values in Formula
TUJT(osc) = (R*C)*ln(1/(1-η)) --> (10*3)*ln(1/(1-0.5))
Evaluating ... ...
TUJT(osc) = 20.7944154167984
STEP 3: Convert Result to Output's Unit
20.7944154167984 Second --> No Conversion Required
20.7944154167984 Second <-- Time period of UJT as an Oscillator
(Calculation completed in 00.015 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

### Time period for UJT as an oscillator Thyristor firing circuit Formula

Time period of UJT as an Oscillator = (Resistance*Capacitance)*ln(1/(1-Intrinsic stand-off ratio UJT as Oscillator))
TUJT(osc) = (R*C)*ln(1/(1-η))

## What is an UJT relaxation oscillator?

UJT relaxation oscillator is a type of RC ( resistor-capacitor) oscillator where the active element is a UJT (uni-junction transistor). UJT is an excellent switch with switching times in the order of nano seconds. It has a negative resistance region in the characteristics and can be easily employed in relaxation oscillators. The UJT relaxation oscillator is called so because the timing interval is set up by the charging of a capacitor and the timing interval is ceased by the the rapid discharge of the same capacitor. Before going into the details of UJT relaxation oscillator let’s have a look at the uni junction transistor (UJT).

## How to Calculate Time period for UJT as an oscillator Thyristor firing circuit?

Time period for UJT as an oscillator Thyristor firing circuit calculator uses Time period of UJT as an Oscillator = (Resistance*Capacitance)*ln(1/(1-Intrinsic stand-off ratio UJT as Oscillator)) to calculate the Time period of UJT as an Oscillator, The Time period for UJT as an oscillator Thyristor firing circuit formula is defined as the time taken by the UJT oscillator to make one complete oscillation. Time period of UJT as an Oscillator is denoted by TUJT(osc) symbol.

How to calculate Time period for UJT as an oscillator Thyristor firing circuit using this online calculator? To use this online calculator for Time period for UJT as an oscillator Thyristor firing circuit, enter Resistance (R), Capacitance (C) & Intrinsic stand-off ratio UJT as Oscillator (η) and hit the calculate button. Here is how the Time period for UJT as an oscillator Thyristor firing circuit calculation can be explained with given input values -> 20.79442 = (10*3)*ln(1/(1-0.5)).

### FAQ

What is Time period for UJT as an oscillator Thyristor firing circuit?
The Time period for UJT as an oscillator Thyristor firing circuit formula is defined as the time taken by the UJT oscillator to make one complete oscillation and is represented as TUJT(osc) = (R*C)*ln(1/(1-η)) or Time period of UJT as an Oscillator = (Resistance*Capacitance)*ln(1/(1-Intrinsic stand-off ratio UJT as Oscillator)). 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 & 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 Time period for UJT as an oscillator Thyristor firing circuit?
The Time period for UJT as an oscillator Thyristor firing circuit formula is defined as the time taken by the UJT oscillator to make one complete oscillation is calculated using Time period of UJT as an Oscillator = (Resistance*Capacitance)*ln(1/(1-Intrinsic stand-off ratio UJT as Oscillator)). To calculate Time period for UJT as an oscillator Thyristor firing circuit, you need Resistance (R), Capacitance (C) & Intrinsic stand-off ratio UJT as Oscillator (η). With our tool, you need to enter the respective value for Resistance, Capacitance & Intrinsic stand-off ratio UJT as Oscillator 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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