Among the issues of LED power supply is among the latest challenges still yet to be fully solved. Dimming Light emitting diodes is theoretically easy, because analogue dimming, which is the adjustment of current, has always been a choice. However, this method only works safely when used with one LED bulb. Systems of Light emitting diodes require a modern-day method of dimming. The 2 basic types 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 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 of the LED current regulated using a potentiometer. The existing is adjusted to the LED increasing and decreasing its intensity.
The downside of analogue dimming is it only works safe so long as we dim a single bulb. Systems of Leds need a more refined technique. The difficulty of dimming a method of LED lights is that we now have various kinds of LEDs, requiring different methods for dimming. If there is a system of lights we want to dim, the different LEDs may react diversely for the same amount of current, and because the current is reduced some LEDs can change off later or sooner than others. Also, analogue dimming largely changes the color in the light, similarly to after it is used in combination with incandescent lights.
By far the most commonly used manner of dimming LEDs is Pulse-Width Modulation, which 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 can not be told from the human eye, therefore LED bulbs always run on the forward current recommended. The frequency of switching determines the brightness of light, and so the longer the lighting is “on” the brighter the light is going to be. This is actually the same technique utilized in incandescent light dimmers also, with the exception that incandescent lights react to current more slowly, and therefore need a different frequency.
Two types of Pulse-With Modulation signals are employed often with dimming light: the top-edge and also the trailing edge techniques. Those two are not the same means of cutting the phase, and result in separate dimming technologies. The most frequently used dimmers of LEDs use solely the top-edge technology. Dimmers marked as R or RL are suitable for most 12v dc power supply led, since they work together with the key edge technology and you should not include electronic transformers. TRIAC drivers, or devices governed through the DMX and digital addressable lighting interface (DALI) protocols and, in the future, may include wireless (RF) as being a control option, that is dimmers that turn or slide having a knob, all work with dimmable LEDs.
Alas leading edge technologies controlled having a touch or push button, are frequently powered by an electric transformer, excluding many dimmable LEDs.
The other form of phase-cutting strategy is trailing edge technique, usually utilized in MOSFET or is not suitable for the majority of dimmable LEDs. One of the latest inventions appearing on the industry is the RAIS lamp technology. RAIS lamps offer a higher amount 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. Should they turn out to be trustworthy their application both domestically and commercially, can come to be much safer and easier than previous dimmable LED lights’.
Within the ever-evolving technologies of Leds, led power 12v are still to get created to further compatibility and performance. While there is no general rule for the purpose dimmer your LED might be ideal for, make sure the technical details with the distributor. Implementation of Leds with non-compatible dimmers might ruin the LEDs, and they are generally, at the moment, not the most affordable solution of lighting.