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Thyristors - TRIACs

A TRIAC (Triode for Alternating Current) is a generic term for an electronic device that acts as a bidirectional, low-power switch with a three-terminal configuration in which current flow is controlled by an externally applied signal. It is a type of thyristor (or switching split) and exhibits typical semiconductor behavior in that it is able to open and close, or turn on and off, when receiving an appropriate electrical signal, allowing it to switch between the forward and reverse directions.The BT134-800E 127 is a specialized type of TRIAC featuring higher levels of power control than traditional designs. In its basic form, the BT134-800E 127 features a firing voltage of 2-80V, an average on-state current of 800A, and a holding current of 500mA. It is well suited for those applications where high levels of voltage and current control are required.The most common application for the BT134-800E 127 is to control the speed of AC induction motors. When used in this application, the TRIAC is placed between the power source and the motor winding in order to provide variable control of the motor speed. The TRIAC can be used to precisely control the speed of the motor by adjusting the firing angle of the TRIAC, which determines the point at which the device switches from forward to reverse conduction. By varying the firing angle, the motor speed can be precisely controlled. Additionally, the TRIAC can be used to provide full or partial motor start or stop functions, or ramp speeds up or down to certain levels.The working principle of a TRIAC is based on the principles of bipolar junction transistor (BJT) conductivity modulation. When a negative pulse is applied to the gate of the device, a negative potential is created between it and the main body of the device, resulting in a depletion layer that causes a portion of the main body to conduct current in the reverse direction. This reversal of the BJT junction results in the formation of a three-phase power system, which is known as the “triode” configuration. The voltage applied to the gate controls the amount of reverse conduction and thus the level of current that is allowed to flow through the device.In summary, the BT134-800E 127 is a specialized type of TRIAC that is used for applications requiring high levels of voltage and current control. The TRIAC can be used to precisely adjust the speed of AC induction motors by varying the firing angle of the device, as well as providing full or partial motor start or stop functions. The working principle of the TRIAC is based on the principles of BJT conductivity modulation.

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