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- Q221499 subject Q7296602.
- Q221499 subject Q8929328.
- Q221499 abstract "TRIAC, from triode for alternating current, is a generic trademark for a three terminal electronic component that conducts current in either direction when triggered. Its formal name is bidirectional triode thyristor or bilateral triode thyristor. A thyristor is analogous to a relay in that a small voltage and current can control a much larger voltage and current. The illustration on the right shows the circuit symbol for a TRIAC where A1 is Anode 1, A2 is Anode 2, and G is Gate. Anode 1 and Anode 2 are normally termed Main Terminal 1 (MT1) and Main Terminal 2 (MT2) respectively.TRIACs are a subset of thyristors and are related to silicon controlled rectifiers (SCRs). However, unlike SCRs, which are unidirectional devices and only conduct current in one direction, TRIACs are bidirectional and conduct current in both directions. Another difference is that SCRs can only be triggered by a positive current at their gate, but, in general, TRIACs can be triggered by either a positive or negative current at their gate, although some special types cannot be triggered by one of the combinations. To create a triggering current for an SCR a positive voltage has to be applied to the gate but for a TRIAC either a positive or negative voltage can be applied to the gate. In all three cases the voltage and current are with respect to MT1. Once triggered, SCRs and thyristors continue to conduct, even if the gate current ceases, until the main current drops below a certain level called the holding current.Gate turn-off thyristors (GTOs) are similar to TRIACs but provide more control by turning off when the gate signal ceases.TRIACs bidirectionality makes them convenient switches for alternating-current (AC). 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). This is commonly used for controlling the speed of induction motors, dimming lamps, and controlling electric heaters.".
- Q221499 thumbnail Triac.svg?width=300.
- Q221499 wikiPageExternalLink HBD855-D.PDF.
- Q221499 wikiPageExternalLink elect5.htm.
- Q221499 wikiPageExternalLink BT138_SERIES_2.pdf.
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- Q221499 wikiPageWikiLink Q7296602.
- Q221499 wikiPageWikiLink Q765270.
- Q221499 wikiPageWikiLink Q8929328.
- Q221499 type Thing.
- Q221499 comment "TRIAC, from triode for alternating current, is a generic trademark for a three terminal electronic component that conducts current in either direction when triggered. Its formal name is bidirectional triode thyristor or bilateral triode thyristor. A thyristor is analogous to a relay in that a small voltage and current can control a much larger voltage and current. The illustration on the right shows the circuit symbol for a TRIAC where A1 is Anode 1, A2 is Anode 2, and G is Gate.".
- Q221499 label "TRIAC".
- Q221499 depiction Triac.svg.