![]() ![]() This is commonly used for controlling the speed of a universal motor, dimming lamps, and controlling electric heaters. In addition, applying a trigger at a controlled phase angle of the AC in the main circuit allows control of the average current flowing into a load ( phase control). ![]() The bidirectionality of TRIACs makes them convenient switches for alternating-current (AC). Gate turn-off thyristors (GTOs) are similar to TRIACs but provide more control by turning off when the gate signal ceases. ![]() Once triggered, SCRs and TRIACs continue to conduct, even if the gate current ceases, until the main current drops below a certain level called the holding current. Most TRIACs can be triggered by applying either a positive or negative voltage to the gate (an SCR requires a positive voltage). TRIACs differ from SCRs in that they allow current flow in both directions, whereas an SCR can only conduct current in a single direction. TRIACs are a subset of thyristors (analogous to a relay in that a small voltage and current can control a much larger voltage and current) and are related to silicon controlled rectifiers (SCRs). The term TRIAC is a genericised trademark. A small plastic-cased TRIAC device mounted on a printed circuit boardĪ TRIAC ( triode for alternating current also bidirectional triode thyristor or bilateral triode thyristor ) is a three terminal electronic component that conducts current in either direction when triggered. ![]()
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