GTO thyristor

Gate turn-off thyristor: conducts while fire is true and forward biased.

  • Boolean
  • electrical
  • Modelica Standard Library
  • 3 ports
  • 2 parameters
BlockGTO thyristorKindidealGTOLibrarySemiconductors

Description

An ideal gate turn-off thyristor: it conducts only while fire is true and the device is forward biased, and turns off as soon as fire goes false.

Use it as a generic unidirectional power switch (IGBT or GTO); add an antiparallel diode for reverse current.

Example

Thyristor and GTO A thyristor that stays on until its current falls to zero, and a GTO that turns off with its gate.

10 V 50 Hz TThyristorLoad Tv TGround T10 V 50 Hz GGTOLoad Gv GGround GFire at 2.5 msFire at 2.5 ms (GTO)
In Gradara, select a GTO thyristor block and press F1, then choose Open example. It opens as a new model in My models, ready to run.

Also in this example:Voltage sensorGroundResistorAC voltageThyristorBoolean pulse

Ports

Inputs 1

  • gfireBoolean

    Gate command (Boolean). True allows forward conduction; false blocks.

Conserving terminals 2

  • Apelectrical

    Anode. Current into p is counted as positive.

  • Knelectrical

    Cathode.

Parameters

  • On resistanceRon0.00001 Ω

    ≥ 0

    On resistance, in ohms: the slope of the conducting branch. 0 or more; the default 10 µΩ is near-ideal.

  • Off conductanceGoff0.00001 S

    ≥ 0

    Off conductance, in siemens: the slope of the blocking branch, so the leakage is Goff · v. 0 or more; the default 10 µS leaks 10 µA per volt.

Equations

Modelica
v = p.v − n.v, i = p.i
Off: i = Goff · v; on: v = Ron · i
off = (s < 0) or not fire, where s < 0 means v < 0 while off, or i < 0 while on

Implementation

Modelica Standard Library 4.1.0Modelica.Electrical.Analog.Ideal.IdealGTOThyristor
MSL documentation

Assumptions and limitations

  • Knee voltage fixed at 0 V. Blocks reverse current even when fire is true. No switching times, tail current, or switching losses.
  • Turning it off with inductive current and no freewheeling path forces the current into Goff, which produces a very large voltage.

See also

Select a block in Gradara and press F1 to open its page offline.