TRIAC [Triode for Alternating Current]
TRIAC What is a Triac? A Triac is defined as a three-terminal AC switch which is different from the other silicon-controlled rectifiers in the sense that it can conduct in both directions that is whether the applied gate signal is positive or negative, it will conduct. Thus, this device can be used for AC systems as a switch. This is a three-terminal, four-layer, bi-directional semiconductor device that controls AC power. The triac of maximum rating of 16 kw is available in the market. The figure shows the symbol of triac, which has two main terminals MT 1 and MT 2 connected in inverse parallel and a gate terminal. Construction of Triac Two SCRs are connected in inverse parallel with the gate terminal as common. Gate terminals is connected to both the N and P regions due to which gate signal may be applied which is irrespective of the polarity of the signal. Here, we do not have anode and cathode since it works for both polarities which means that device is bilateral. It consi...