Amongst the issues of LED power supply 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 an option. However, this process only works safely when combined with one LED bulb. Systems of LEDs demand a more sophisticated approach to dimming. The 2 basic kinds of dimming are definitely the PWM or Pulse-Width-Modulation and the analogue dimming, each of which are switched-mode regulators. These two types are similar in the sense that they both control the time-averaged current through the diode.
Analogue dimming is definitely a simple way of dimming, this is the adjustment of cycle-by-cycle in the LED current regulated with a potentiometer. The current is adjusted towards the LED increasing and decreasing its intensity.
The downside of analogue dimming is it only works safe so long as we dim a single light. Systems of LED lights demand a more refined technique. The issue of dimming a system of LED lights is there are many types of LEDs, requiring different methods for dimming. If there is a method of lights we would like to dim, the many LEDs may react diversely for the equivalent amount of current, and because the current is reduced some LEDs can turn off later or earlier than others. Also, analogue dimming largely changes the colour of the light, similarly to when it is used with incandescent lights.
By far the most frequently used manner of LED dimmmable 12v is Pulse-Width Modulation, which can be fundamentally the cutting of the phase in a certain frequency. PWM switches the devices between fully on and fully off in a frequency that should not be told from the eye, therefore LED bulbs always run on the forward current recommended. The frequency of switching determines the brightness of light, so the longer the lights are “on” the brighter the sunshine will likely be. This is the same technique used in incandescent light dimmers also, other than incandescent lights react to current slower, and thus require a different frequency.
Two kinds of Pulse-With Modulation signals are employed often with dimming light: the key-edge as well as the trailing edge techniques. Those two are different means of cutting the phase, and result in separate dimming technologies. By far the most frequently used dimmers of LEDs use solely the key-edge technology.
Dimmers marked as R or RL are suitable for most dimmable LEDs, because they work together with the key edge technology and do not include electronic transformers. TRIAC drivers, or devices governed through the DMX and digital addressable lighting interface (DALI) protocols and, later on, can include wireless (RF) as a control option, which is dimmers that turn or slide having a knob, all work with dimmable LEDs. Alas leading edge technologies controlled using a touch or push button, are nzyjty powered by an electrical transformer, excluding many dimmable LEDs.
The other kind of phase-cutting method is trailing edge technique, usually found in MOSFET or is not suitable for the majority of dimmable LEDs. Among the latest inventions appearing on the industry is the RAIS lamp technology. RAIS lamps give you a higher degree of functionality and seem to work alongside all sorts of dimmers available on the market. However RAIS technology is still new, as well as its long-term impact on LEDs have not been fully tested. Should they turn out to be trustworthy their application both domestically and commercially, can turn out to be much safer and easier than previous dimmable LED lights’.
Within the ever-evolving technologies of Leds, LED ac110VDC12V driver are still to be developed to further compatibility and much better performance. As there is no general rule for which dimmer your LED may be suitable for, always check the technical details using the distributor. Use of LED lights with non-compatible dimmers might ruin the LEDs, and they are generally, right now, not the cheapest solution of lighting.