Chapter 5 TRIAC - Notes, Power Electronics, Electrical Engineering Electrical Engineering (EE) Notes | EduRev

Electrical Engineering SSC JE (Technical)

Electrical Engineering (EE) : Chapter 5 TRIAC - Notes, Power Electronics, Electrical Engineering Electrical Engineering (EE) Notes | EduRev

The document Chapter 5 TRIAC - Notes, Power Electronics, Electrical Engineering Electrical Engineering (EE) Notes | EduRev is a part of the Electrical Engineering (EE) Course Electrical Engineering SSC JE (Technical).
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TRIAC

Triode + AC → TRIAC

These are multiplayer (5 layers), three terminals semiconductor devices which operate in both direction (quadrant I and III). In other words, there are two SCRs connected in anti-parallel. These operate in the same manner as an SCR in either direction. Triac activates on either a positive or negative gate voltage i.e. it can be triggered into conduction when gate is either positive or negative w.r.t. T1.

Chapter 5 TRIAC - Notes, Power Electronics, Electrical Engineering Electrical Engineering (EE) Notes | EduRev
Chapter 5 TRIAC - Notes, Power Electronics, Electrical Engineering Electrical Engineering (EE) Notes | EduRev

The current-voltage characteristic of the triac is symmetrical about the origin as shown in figure.

Mode  Potential of T2Potential of gate with respect to T1
I+PositivePositive
I-PositiveNegative
III+NegativePositive
III-NegativeNegative

The operating modes of the triac are given in the table. Triacs are usually most sensitive to gate current in the I+ and III modes, and least sensitive in the mode III . The gate current IGT, required to trigger as triac is typically 40 mA in the T and III” modes, and 60-100 mA in the I” and I1I+ modes. The main disadvantage with triacs is that the positive breakdown voltage is different than its negative breakdown voltage.

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