TRIAC Specifications and Recommendations (Turn‐On Behavior)

Posted by Author on Jul 25, 2016 11:43:22 AM

Wiki defines a TRIAC as an electronic component approximately equivalent to two siliconcontrolled rectifiers (SCRs/thyristors) joined in inverse parallel (paralleled but with the polarity reversed) and with their gates connected together. This results in a bidirectional electronic switch which can conduct current in either direction when it is triggered (turned on) and thus doesn't have any polarity. It can be triggered by either a positive or a negative voltage being applied to its gate electrode. Once triggered, the device continues to conduct until the current through it drops below a certain threshold value, the holding current, such as at the end of a halfcycle of alternating current (AC) main power. This makes the TRIAC a very convenient switch for AC circuits, allowing the control of very large power flows with milliamperescale control currents. In addition, applying a trigger pulse at a controllable point in an AC cycle allows one to control the percentage of current that flows through the TRIAC to the load (phase control).

Topics: TRIAC Specifications, SPICE model

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