| Ideal Semiconductor Parameters. |
| Function |
Specify piece-wise linear model parameters for a diode, IGBT, Mosfet, Zener, Schottky, thyristor, DIAC, TRIAC or a GTO.
Model parameters are defined in a .MODEL command line. See the menu items Insert/Edit Commands, Insert/Include Files |
| Format |
.Model Modelname Type <Ron=r><Roff=r> <VthOn=r><VthOff=r> <VthGate=r>| Modelname | Name which is used for identifying the model. | | Type | Type of the model, choose between:
Dswitch, SCR, DIAC, TRIAC, GTO | | <Ron> | On resistance of the device. Default value = 1e-3 ohm | | <Roff> | Off resistance of the device. Default value = 1e+6 ohm | | <VthOn> | Threshold voltage Vak of the diode. If Vak > VthOn the diode turns on. Default value=0.6. | | <VthOff> | Threshold voltage Vak of the diode. If Vak < VthOff the diode turns off. Default value=0. | | <VBR> | | | <VthGate> | Threshold voltage of the gate ( only for thyristors and GTOs). If (Ngate or Sgate) > VthGate, the thyristor or the GTO is turned on. If (Ngate or Sgate) < -VthGate, the GTO is turned off. Default value=0.6. |
|
| Special |
| Dswitch | Diode | | SCR | Thyristor (Silicon Controlled Rectifier) | | GTO | Gate Turn-Off Thyristor | | DIAC | The threshold voltage of the DIAC in the on state is defined by VthOff | | TRIAC | The TRIAC is turned on if the value of Sgate is bigger than zero. The gate of the TRIAC has only a logic function.
Initial condition: (Specified at the component)
IC=OnP
Conduction from node1 to node2
IC=OnN
Conduction from node2 to node1 | | ZENER | Same functionality as the Diode | | SCHOTTKY | Same functionality as the Diode | | MOSFET | | | IGBT | |
Forward voltage of the Diode, SCR, GTO, DIAC and TRIAC.
The forward voltage of a Diode, SCR, GTO, DIAC or TRIAC is defined by VthOff.
The Diode, SCR, GTO, DIAC or TRIAC turns on if Vak>VthOn, having a forward voltage of VthOff. As soon as the voltage across the diode, SCR, GTO, DIAC or TRIAC drops below VthOff, causing a negative current, the device turns off. Default the forward voltage is set to 0 volt. |
| Example |
.Model Dfree
.Model matrix
.Model GTOmodel
.Model Ddiac | Dswitch
SCR
GTO
DIAC | ron=1
Vthgate=0
Vthgate=1
VthOn=0.8 | roff=10000
Vthon=0.01
VthOff=0.6 |
|
| Select from |
Components/Circuit/Semiconductors |
