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Gate Turn-Off Thyristor (GTO)


The GTO is a semiconductor device that can be turned ON/OFF via a gate signal.  The model considers various factors like forward bias threshold, forward and reverse break over voltage, blocking current, snubber elements, holding current, on/off resistance. Depending on the user's requirement, there is also an option to select the precision functionality, which allows the user to compensate for errors due to digital implementation of the model during the state switching as a function of time step. The GTO thyristor turns on when the applied anode-cathode voltage is greater than forward voltage and a positive pulse signal is present at the gate input (g > 0). When the gate signal is set to 0, the GTO thyristor starts to block but its current does not stop instantaneously.

The model also includes an option to enable Fail reset mode which produces a signal if the diode has reached its normal or reverse breakdown voltage or if an untimely firing had happened.

Table of Contents

Mask and Parameters


NameDescriptionUnitVariable = {Possible Values}
VminForward voltage dropV


RopenOpen state resistanceOhm{(0,1e12]}
RcloseClosed state resistanceOhm{(0,1e12]}
RsnubberSnubber resistanceOhm{[0,1e12]}
CsnubberSnubber capacitanceF{[0,1e12]}
Control type

External Input pins: Schematic control signal; the received integer is converted to a binary string where each digit corresponds to a phase

External Input sensors: Target digital inputs


NameDescriptionUnitVariable = {Possible Values}
Fail resetFail reset

{Enable, Disable}

Precision valve

Enable: Enables recalculation of the state switch command using exact time between steps (as percentage of time step)

Disable: does not use precision valve

{Enable, Disable}
IminHolding currentA{[0,1e12]}
FbovForward break over voltageV{[0,1e12]}
RbovReverse break over voltageV{[0,1e12]}

Ports, Inputs, Outputs and Signals Available for Monitoring


Net_1Network connection
Net_2Network connection


DDelay used for precision valves
PBinary coded firing pulses




DDelay used for precision valve, measured from changing point to current time steps
FailSigFail reset signal
IDiode currentA
DelayDelay due to forward voltage drops
Delay12Delay in forward GTO Thyristor modes
State12Diode state
PBinary coded firing pulses
DelayExt12Delay for external triggers
Cmd12Signal state command
CmdExt12Signal state external command

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