Amongst the issues of LED diver is one of the latest challenges still yet to be fully solved. Dimming LEDs is theoretically easy, because analogue dimming, which is the adjustment of current, has always been an option. However, this method only works safely when used in combination with one LED bulb. Systems of LEDs demand a more sophisticated method of dimming. Both basic kinds of dimming are the PWM or Pulse-Width-Modulation as well as the analogue dimming, both 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 an extremely simple method of dimming, this is the adjustment of cycle-by-cycle from the LED current regulated using a potentiometer. The present is adjusted for the LED increasing and decreasing its intensity.
The downside of analogue dimming is it only works safe so long as we dim one particular bulb. Systems of LED lights demand a more refined technique. The problem of dimming a process of LED lights is that we now have various kinds of LEDs, requiring various methods for dimming. When there is a system of lights we wish to dim, the various LEDs may react diversely to the equivalent amount of current, and because the current is reduced some LEDs can change off later or earlier than others. Also, analogue dimming largely changes the color of the light, similarly to when it is used with incandescent lights.
By far the most commonly used technique of LED dimming power supply is Pulse-Width Modulation, which can be fundamentally the cutting in the phase in a certain frequency. PWM switches the devices between fully on and fully off in a frequency that should not be told by the eye, therefore LED bulbs always run on the forward current recommended. The frequency of switching determines the brightness of light, therefore the longer the lighting is “on” the brighter the lighting is going to be. This is the same technique utilized in incandescent light dimmers too, with the exception that incandescent lights react to current slower, and for that reason require a different frequency.
Two kinds of Pulse-With Modulation signals are used often with dimming light: the leading-edge and the trailing edge techniques. These two are not the same methods for cutting the phase, and bring about separate dimming technologies. The most frequently used dimmers of LEDs use solely the top-edge technology.
Dimmers marked as R or RL are compatible with most dimmable LEDs, since they work with the leading edge technology and you should not include electronic transformers. TRIAC drivers, or devices governed by the DMX and digital addressable lighting interface (DALI) protocols and, in the future, may include wireless (RF) as being a control option, that is certainly 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 electric transformer, excluding many dimmable LEDs.
Another type of phase-cutting strategy is trailing edge technique, usually used in MOSFET or possibly is not suitable for almost all dimmable LEDs. Among the latest inventions appearing on the industry is the RAIS lamp technology. RAIS lamps give you a higher amount of functionality and seem to work with all types 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. When they prove to be trustworthy their application both domestically and commercially, can grow to be much safer and simpler than previous dimmable LED lights’.
Within the ever-evolving technologies of Leds, led power 12v remain to get created to further compatibility and performance. As there is no general rule for what dimmer your LED might be suitable for, check the technical details using the distributor. Use of Leds with non-compatible dimmers might ruin the LEDs, plus they are, at the moment, not the least expensive solution of lighting.