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Thyristor

Purpose

Ideal thyristor (SCR) with optional forward voltage and on-resistance

Library

Electrical / Power Semiconductors

Description

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The Thyristor can conduct current only in one direction--like the diode. In addition to the diode it can be controlled by an external gate signal. The thyristor is modeled by an ideal switch that closes if the voltage between anode and cathode is positive and a non-zero gate signal is applied. The switch remains closed until the current passes through zero. A thyristor cannot be switched off via the gate.

Parameters

The following parameters may either be scalars or vectors corresponding to the implicit width of the component:

Forward voltage
Additional dc voltage Vf    in volts (V) between anode and cathode when the thyristor is conducting. The default is 0.
On-resistance
The resistance Ron   of the conducting device, in ohms (_O_  ). The default is 0.
Initial conductivity
Initial conduction state of the thyristor. The thyristor is initially blocking if the parameter evaluates to zero, otherwise it is conducting.
Thermal description
Switching losses, conduction losses and thermal equivalent circuit of the component. For more information see chapter Thermal Modeling. If no thermal description is given the losses are calculated based on the voltage drop von = Vf + Ron ⋅i  .
Initial temperature
Temperature of all thermal capacitors in the equivalent Cauer network at simulation start.

Probe Signals

Thyristor voltage
The voltage measured between anode and cathode.
Thyristor current
The current through the thyristor flowing from anode to cathode.
Thyristor gate signal
The gate input signal of the thyristor.
Thyristor conductivity
Conduction state of the internal switch. The signal outputs 0 when the thyristor is blocking, and 1 when it is conducting.
Thyristor junction temperature
Temperature of the first thermal capacitor in the equivalent Cauer network.
Thyristor conduction loss
Continuous thermal conduction losses in watt (W). Only defined if the component is placed on a heat sink.
Thyristor switching loss
Instantaneous thermal switching losses in joule (J). Only defined if the component is placed on a heat sink.