Among the issues of led light transformer is probably the latest challenges still yet to be fully solved. Dimming LEDs is theoretically easy, because analogue dimming, which is the adjustment of current, is definitely a choice. However, this method only works safely when used with one LED bulb. Systems of Light emitting diodes require a modern-day way of dimming. The 2 basic kinds of dimming are the PWM or Pulse-Width-Modulation and the analogue dimming, each of which are switched-mode regulators. Those two types are similar within the sense that they both control the time-averaged current from the diode.
Analogue dimming is an extremely simple way of dimming, it will be the adjustment of cycle-by-cycle of the LED current regulated using a potentiometer. The existing is adjusted for the LED increasing and decreasing its intensity.
The disadvantage of analogue dimming is that it only works safe so long as we dim a single bulb. Systems of LED lights require a more refined technique. The problem of dimming a method of Leds is that there are many types of LEDs, requiring different methods for dimming. If there is a method of lights we wish to dim, the many LEDs may react diversely to the equivalent amount of current, and because the current is reduced some LEDs can turn off later or sooner than others. Also, analogue dimming largely changes the color in the light, similarly to when it is combined with incandescent lights.
Probably the most frequently used technique of dimming LEDs is Pulse-Width Modulation, that is basically the cutting from the phase with a certain frequency. PWM switches the devices between fully on and fully off in a frequency that should not be told from the human eye, therefore LED bulbs always run on the forward current recommended. The regularity of switching determines the brightness of light, and so the longer the lighting is “on” the brighter the lighting will be. Here is the same technique utilized in incandescent light dimmers too, with the exception that incandescent lights react to current more slowly, and thus demand a different frequency.
2 kinds of Pulse-With Modulation signals are used often with dimming light: the leading-edge as well as the trailing edge techniques. Those two are not the same means of cutting the phase, and lead to separate dimming technologies. Probably the most frequently used dimmers of LEDs use solely the key-edge technology. Dimmers marked as R or RL are compatible with most LED dimming diver, because they assist the top edge technology and never include electronic transformers. TRIAC drivers, or devices governed by the DMX and digital addressable lighting interface (DALI) protocols and, later on, may include wireless (RF) as a control option, that is dimmers that turn or slide using a knob, all work together with dimmable LEDs.
Alas leading edge technologies controlled with a touch or push button, are often powered by an electric powered transformer, excluding many dimmable LEDs.
Another kind of phase-cutting method is trailing edge technique, usually utilized in MOSFET or perhaps is not suitable for almost all dimmable LEDs. Among the latest inventions appearing on the industry is the RAIS lamp technology. RAIS lamps offer a higher level of functionality and seem to work with all types of dimmers available on the market. However RAIS technology is qtjzkb new, and its long term impact on LEDs have not been fully tested. If they turn out to be trustworthy their application both domestically and commercially, can come to be much safer and simpler than previous dimmable LED lights’.
In the ever-evolving technologies of Leds, LED dimmable diver are still to get developed to further compatibility and much better performance. While there is no general rule for the purpose dimmer your LED might be suitable for, always check the technical details with all the distributor. Implementation of Leds with non-compatible dimmers might ruin the LEDs, plus they are, at the moment, not the least expensive solution of lighting.