![]() A Triac circuit operates by delaying the beginning of each half-cycle of alternating current (ac) power, which is referred to as "phase control." By making use of the Triac phase-controlled operating principle, the supply voltage of the lamp circuit is regulated by controlling the conduction angle of the Triac element to chop out a part of the sine wave voltage input from the AC power network, to reduce the average value of the output voltage, as a way to realize the dimming function for LEDs. ![]() A Triac (Triode for Alternating Current) is a bidirectional thyristor device for alternating current which may be regarded as a switch that is able to conduct current in either direction. The first is forward-phase dimmer (Triac dimmer) and the second is reverse-phase dimmer (Transistor dimmer). In offline LED dimming application, there are two forms of most popular dimmers available in the market. There are various varieties of dimming technologies for lighting applications.
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