How do you wire a TRIAC LED control system?
It can be challenging to wire TRIAC dimmers to LED drivers, so here is a breakdown of how to go about the task. The most common dimmer is the standard forward phase dimmer: it comprises a TRIAC and a resistance circuit. Resistance is controlled by a potentiometer, and the RC time then controls the amount of delay created before a TRIAC turns on which is also the firing angle.
The period of time when the TRIAC is on (active) is referred to as a ‘conduction angle’. This results in a voltage waveform which is a phase-cut sine wave (a ‘sinusoid’). A standard switching converter is used in regulating the output with no limits on the input voltage. In this case, the phase-chopped waveform provided by the phase dimmer is decoded first; the decoded info is used in controlling the reference for output regulation.
‘Leading edge’ dimmers make use of a TRIAC switch in controlling power while ‘trailing edge’ dimmers use MOSFETs or IBGTs to control power. So it is important to ensure that your phase-cut dimmable LED driver is compatible with the dimmer switch you will be using before you can make any purchase.