Available in sizes from 10 to 35watts, AC Electronics NEW TRIAC dimming LED drivers offers many benefits to the lighting fixture OEMS. These include:
- Architectural dimming down to 1%
- small form factors
- Excellent pricing
With these new TRIAC LED drivers, AC Electronics has successfully dealt with, and eliminated possible TRIAC dimming issues, such as annoying “hum” and flicker which can be caused by incompatible dimmer/driver combinations.
AC Electronics has extensively tested and approved a list of TRIAC compatible dimmers made by several major lighting control manufacturers. Using these approved dimmers with AC TRIAC Drivers will give OEMs virtually flawless, long term operation. These TRIAC drivers are compatible with both leading and trailing edge dimmers.
About TRIAC Dimmers
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.
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.