Thyristor

Simple Thyristor Model

Library

Electrical/Analog/Semiconductors

Description

This is a simple thyristor model with three pins: Anode (left), Cathode (right) and Gate (top). There are three operating modes:

conducting, blocking and reverse breakthrough.

As long as the thyristor is in blocking mode it behaves like a linear resistance Roff=VDRM^2/(VTM*IH). But if the voltage between anode and cathode exceeds VDRM or a positive gate current flows for a sufficient time the mode changes to conducting mode. The model stays in conducting mode until the anode current falls below the holding current IH. There is no way to switch off the thyristor via the gate. If the voltage between anode and cathode is negative, the model represents a diode (parameters Vt, Nbv) with reverse breakthrough voltage VRRM.

The dV/dt switch on is not taken into account in this model. The gate circuit is not influenced by the main circuit.

Parameters

    Thyristor_0

  • VDRM [V] : Forward breakthrough voltage (>= 0) (VDRM): Scalar.
  • VRRM [V] : Reverse breakthrough voltage (>= 0) (VRRM): Scalar.
  • IDRM [A] : Saturation current (IDRM): Scalar.
  • VTM [V] : Conducting voltage (VTM): Scalar.
  • IH [A] : Holding current (IH): Scalar.
  • ITM [A] : Conducting current (ITM): Scalar.
  • VGT [V] : Gate trigger voltage (VGT): Scalar.
  • IGT [A] : Gate trigger current (IGT): Scalar.
  • TON [s] : Switch on time (TON): Scalar.
  • TOFF [s] : Switch off time (TOFF): Scalar.
  • Vt [V] : Voltage equivalent of temperature (kT/qn) (Vt): Scalar.
  • Nbv [-] : Reverse Breakthrough emission coefficient (Nbv): Scalar.

Ports

  • Port 1 at left position: implicit input fixedport numbered 1.
  • Port 1 at top position: implicit input fixedport numbered 2.
  • Port 1 at right position: implicit output fixedport numbered 1.

See Also