Question
Download Solution PDFA triac is a semi-conductor device which acts as a
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFTriac:
- A Triac is a bidirectional thyristor with three terminals i.e. it can conduct in both directions.
- Its three terminals are usually designated as MT1 (Anode 1), MT2 (Anode 2), and the gate by G as in a thyristor.
- When in operation, a Triac is equivalent to two SCRs connected in antiparallel.
- As the Triac can conduct in both directions, the terms anode and cathode are not applicable to Triac.
- It is used extensively for the control of power in ac circuits.
The symbol and the i-v characteristics of triac are shown below.
A triac may sometimes operate in the rectifier mode rather than in the bidirectional mode. This may happen due to the following reasons.
- For a given value of positive gate current, a triac may turn on with MT2 positive in the first quadrant but may fail to turn on with MT2 negative.
- With constant negative gate current, the triac may turn on with MT2 negative in the third quadrant but may not turn on with MT2 positive.
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