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Contents of the SCR Characteristics PDF

List of 16 SCR Characteristics Formulas

Circuit Turn off Time Class B Commutation

Circuit Turn off Time Class C Commutation

Derating Factor of Series Connected Thyristor String

Discharging Current of dv-dt Protection Thyristor Circuits

Emitter Current for UJT based Thyristor Firing Circuit

Emitter Voltage to Turn On UJT based Thyristor Firing Circuit

Frequency of UJT as Oscillator Thyristor Firing Circuit

Intrinsic Stand-off Ratio for UJT based Thyristor Firing Circuit

Leakage Current of Collector-Base Junction

Peak Current Class B Thyristor Commutation

Power Dissipated by Heat in SCR

Thermal Resistance of SCR

Thyristor Commutation Voltage for Class B Commutation

Thyristor Conduction Time for Class A Commutation

Time Period for UJT as Oscillator Thyristor Firing Circuit

Worst Case Steady State Voltage across First Thyristor in Series Connected Thyristors

Variables used in SCR Characteristics PDF

C Capacitance (Farad)
C_com Thyristor Commutation Capacitance (Farad)
DRF Derating Factor of Thyristor String
f Frequency (Hertz)
I_C Collector Current (Ampere)
I_CBO Collector Base Leakage Current (Ampere)
I_discharge Discharging Current (Ampere)
I_E Emitter Current (Ampere)
I_L Load Current (Ampere)
I_o Peak Current (Ampere)
L Inductance (Henry)
n Number of Thyristors in Series
P_dis Power Dissipated by Heat (Watt)
R₁ Resistance 1 (Ohm)
R₂ Resistance 2 (Ohm)
R_B1 Emitter Resistance Base 1 (Ohm)
R_B2 Emitter Resistance Base 2 (Ohm)
R_E Emitter Resistance (Ohm)
R_stb Stablizing Resistance (Ohm)
t₃ Thyristor Reverse Bias Time (Second)
t₄ Auxiliary Thyristor Reverse Bias Time (Second)
T_amb Ambient Temperature (Kelvin)
t_B(off) Circuit Turn Off Time Class B Commutation (Second)
t_C(off) Circuit Turn Off Time Class C Commutation (Second)
T_junc Junction Temperature (Kelvin)
t_o Thyristor Conduction Time (Second)
T_UJT(osc) Time Period of UJT as Oscillator (Second)
V_com Thyristor Commutation Voltage (Volt)
V_d Diode Voltage (Volt)
V_E Emitter Voltage (Volt)
V_in Input Voltage (Volt)
V_RB1 Emitter Resistance Base 1 Voltage (Volt)
V_ss Worst Case Steady State Voltage (Volt)
V_string Resultant Series Voltage of Thyristor String (Volt)
α Common-Base Current Gain
ΔI_D Off State Current Spread (Ampere)
η Intrinsic Stand-off Ratio
θ Thermal Resistance (Kelvin per Watt)
ω Angular Frequency (Radian per Second)

Constants, Functions and Measurements used in SCR Characteristics PDF

Constant: pi, 3.14159265358979323846264338327950288
Archimedes' constant
Function: cos, cos(Angle)
Cosine of an angle is the ratio of the side adjacent to the angle to the hypotenuse of the triangle.
Function: ln, ln(Number)
The natural logarithm, also known as the logarithm to the base e, is the inverse function of the natural exponential function.
Function: sqrt, sqrt(Number)
A square root function is a function that takes a non-negative number as an input and returns the square root of the given input number.
Measurement: Time in Second (s)
Time Unit Conversion
Measurement: Electric Current in Ampere (A)
Electric Current Unit Conversion
Measurement: Temperature in Kelvin (K)
Temperature Unit Conversion
Measurement: Power in Watt (W)
Power Unit Conversion
Measurement: Frequency in Hertz (Hz)
Frequency Unit Conversion
Measurement: Capacitance in Farad (F)
Capacitance Unit Conversion
Measurement: Electric Resistance in Ohm (Ω)
Electric Resistance Unit Conversion
Measurement: Inductance in Henry (H)
Inductance Unit Conversion
Measurement: Thermal Resistance in Kelvin per Watt (K/W)
Thermal Resistance Unit Conversion
Measurement: Electric Potential in Volt (V)
Electric Potential Unit Conversion
Measurement: Angular Frequency in Radian per Second (rad/s)
Angular Frequency Unit Conversion

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