PLECS 1.3 Online Help

TRIAC

Purpose

Ideal TRIAC with or without forward voltage and on-resistance.

Library

Switches

Description

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The TRIAC can conduct current in both directions. It is built using two anti-parallel thyristors and controlled by an external gate signal. The TRIAC is modeled by two ideal switches that close if the voltage is positive and a non-zero gate signal is applied. The conducting switch remains closed until the current becomes zero. A TRIAC cannot be switched off via the gate.

Parameters and Dialog Box

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Width
The width of the component. The default is 1.

Each of the following parameters may either be a scalar or a vector with the width of the component:

Forward voltage
Additional dc voltage V f in volts (V) when one of the thyristors is conducting. The default is 0.
On-resistance
The resistance Ron of the conducting device, in ohms (_O_). The default is 0.
Initial conductivity
Initial conduction state of the TRIAC. The TRIAC is initially blocking if the parameter evaluates to zero, otherwise it is conducting.

Probe Signals

TRIAC voltage
The voltage measured between the terminals.
TRIAC current
The current flowing through the device to the terminal with the gate.
TRIAC conductivity
Conduction state of the internal switch. The signal outputs 0 when the TRIAC is blocking, and 1 when it is conducting.