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Thyristors - TRIACs

Thyristors are an important class of semiconductor electronic components, providing control of large amounts of electrical power and current. One type of thyristor is the TRIAC, or bidirectional triode thyristor. The BT138-800E/DG is a TRIAC designed for a wide range of applications, which will be explored below.

Application Field

The BT138-800E/DG TRIAC is suitable for a variety of applications. It can be used in dimmers for lighting control, AC motor speed control and sheet cutting for heating applications. Additionally, it can be employed in the switching of ac loads and is suitable for when thyristor switching control is needed in the range from 150V AC to 800V AC.

Working Principle

The BT138-800E/DG employs a two-step capacitive triggering technique and a fast-switching technology, allowing for high switching rates of up to 10kHz. It is triggered with a triggered silicon-controlled rectifier (SCR), ensuring the simultaneous incorporation of both steps of the trigger. Once the firing SCR is triggered and the voltage on the gate rises to its minimum firing voltage, the TRIAC is activated. The BT138-800E/DG is composed of a set of three electrodes: the anode, the cathode and the gate terminal. When a voltage impressed between these terminals is increased to a certain value, it is capable of controlling the current flow in a bi-directional manner. It can open, close and regulate the current between the anode and cathode terminals by varying the gate voltage, thus allowing the BT138-800E/DG to be used for switching, phase control and selection of the desired voltage or current.

Efficiency

The BT138-800E/DG is highly efficient with a low on-state conduction angle soft start, which increases its power conservation features. High-frequency auxiliary additional-supply inductance can be used to prevent interference and promote harmonic reduction. The BT138-800E/DG is also capable of generating less noise due to its small resistive or capacitive loads and high switching speed.

Safety Precautions

The BT138-800E/DG operates at a maximum 800V AC, making safety precautions necessary. Before starting any TRIAC applications, the user should understand the basics of the device and its potential dangers. To ensure safety, a heat sink should be attached to any TRIACs used to dissipate any excess heat produced by the application. Proper wiring configuration should also be observed to avoid short-circuit and accidental triggering.

Summary

The BT138-800E/DG TRIAC is a bi-directional thyristor suitable for a variety of control applications. It features an efficient two-step triggering system, allowing for a fast-switching up to 10kHz, along with low on-state conduction angles for power conservation. However, safety should always be considered before commencing any TRIAC applications.

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