Thyristor
Purpose
Ideal thyristor (SCR) with optional forward voltage and on-resistance
Library
Electrical / Power Semiconductors
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 when the voltage between anode and cathode is positive and a non-zero gate signal is applied. The switch remains closed until the current becomes negative. A thyristor cannot be switched off via the gate.
Parameters
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 gate signal
- The gate input signal of the thyristor.
- 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 watts (W). Only defined if the component is placed on a heat sink.
- Thyristor switching loss
- Instantaneous thermal switching losses in joules (J). Only defined if the component is placed on a heat sink.