MAC8NG

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Thyristors - TRIACs

Thyristors - TRIACs are a class of thyristors that are used as switches for higher power applications such as AC motor control, light dimming and industrial automation. TRIACs are bidirectional switches that can conduct current in either direction and provide a relatively low impedance path until the TRIAC is turned off. TRIACs are made of two thyristors connected back to back, each one carrying half of the total current.

A TRIAC consists of two SCR’s or Thyristor’s requiring two gates,main and auxiliary gate. A typical MAC8NG TRIAC is composed of two parallel thyristors connected such that conduction can occur in either direction, by applying suitable gates pulses at the gates in the required sequence. The turn-on as well as the turn-off of the TRIAC is accomplished by a suitable gating signal applied across the main gate and the auxiliary gate leads respectively. The conduction state can be maintained with zero gate current.

A common application of a TRIAC is AC switching, light dimming and circuit control. They are used to control the speed of AC motors, regulate the intensity of light bulbs and as controls for heaters. TRIACs also find applications in various other industrial control systems. The main advantage of using a TRIAC is that it can be controlled by a smaller current, meaning that it is less bulky and consumes less power. Furthermore, it can be used to control the alternating current (AC) in both directions, which is not possible with a transistor.

The working principle of a MAC8NG TRIAC is relatively straightforward. It consists of a pair of two thyristors connected in anti-parallel. This allows it to conduct current in both directions, since the thyristors are non-linear devices (they switch ON and OFF at varying voltages). When a gate current is applied to the TRIAC, it starts conducting in one direction, but soon after reaches the breakover voltage and conducts in the opposite direction.

The triac has two gates that act as a control device, allowing the user to control the operating voltage and power levels, as well as turn it on and off. When a positive gate is applied to the gate, the triac will start to conduct, and the gate voltage needs to stay above the current to keep it conducting. When the gate voltage is below the current, the triac will switch off automatically.

The MAC8NG TRIAC is a very useful tool in many industrial applications as it enables AC to be switched on and off quickly and without generating sparks. This eliminates spark hazards and allows for more responsive and precise control over AC motors, lights and other applications. Another advantage of the TRIAC is that it operates with minimal current, which makes it an energy efficient solution.

The MAC8NG TRIAC is an example of how advanced technology can be put to practical use to form intelligent and reliable control systems. It is a reliable and cost effective solution for controlling AC loads, light dimming, switching and other industrial control applications. With its low power and high current capacity it is ideal for both domestic and industrial use and is a valuable asset for many automation systems.

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