One of the issues of led light transformer is probably the latest challenges still yet to be fully solved. Dimming Light emitting diodes is theoretically easy, because analogue dimming, that is the adjustment of current, has always been a choice. However, this technique only works safely when used with one LED bulb. Systems of LEDs require a modern-day way of dimming. The 2 basic types of dimming are the PWM or Pulse-Width-Modulation and 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 a very simple means of dimming, it will be the adjustment of cycle-by-cycle in the LED current regulated with a potentiometer. The current is adjusted to the LED increasing and decreasing its intensity.
The drawback to analogue dimming is that it only works safe as long as we dim a single light. Systems of LED lights need a more refined technique. The problem of dimming a system of Leds is that there are various types of LEDs, requiring various ways for dimming. If you have a system of lights we would like to dim, the various LEDs may react diversely to the equivalent amount of current, and as the current is reduced some LEDs can change off later or earlier than others. Also, analogue dimming largely changes the colour from the light, similarly to when it is combined with incandescent lights.
By far the most commonly used manner of dimming LEDs is Pulse-Width Modulation, which can be basically the cutting of the phase with a certain frequency. PWM switches the devices between fully on and fully off at a frequency that cannot be told through the human eye, therefore LED bulbs always run on the forward current recommended. The regularity of switching determines the brightness of light, so the longer the lighting is “on” the brighter the lighting will be. This is actually the same technique found in incandescent light dimmers also, with the exception that incandescent lights react to current slower, and for that reason demand a different frequency.
Two types of Pulse-With Modulation signals are used often with dimming light: the top-edge and also the trailing edge techniques. Those two will vary ways of cutting the phase, and result in separate dimming technologies. Probably the most commonly used dimmers of LEDs use solely the leading-edge technology. Dimmers marked as R or RL are compatible with most LED dimming diver, since they assist 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, 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 with a touch or push button, tend to be powered by an electric transformer, excluding many dimmable LEDs.
One other kind of phase-cutting method is trailing edge technique, usually utilized 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 offer a higher degree of functionality and seem to do business with all types of dimmers available on the market. However RAIS technology is qtjzkb new, along with its long-term influence on LEDs have not been fully tested. When they prove to be trustworthy their application both domestically and commercially, can turn out to be much safer and much easier than previous dimmable LED lights’.
In the ever-evolving technologies of LED lights, led driver 12v are still to get created to further compatibility and better performance. As there is no general rule for the purpose dimmer your LED might be appropriate for, always check the technical details using the distributor. Implementation of Leds with non-compatible dimmers might ruin the LEDs, and they are, at the moment, not the cheapest solution of lighting.