Thyristor
Purpose
Ideal thyristor (SCR) with or without forward voltage and on-resistance.
Library
Switches
Description
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 and Dialog Box
The following parameters may either be scalars or vectors corresponding to the
implicit width of the component:
-
Forward voltage
- Additional dc voltage
in volts (V) between anode and
cathode when the thyristor is conducting. The default is 0.
-
On-resistance
- The resistance
of the conducting device, in ohms (
). 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
.
-
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 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.