One of the issues of LED power supply is one of 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 an option. However, this technique only works safely when used with one LED bulb. Systems of Light emitting diodes require a more sophisticated method of dimming. The 2 basic kinds of dimming are the PWM or Pulse-Width-Modulation and also 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 means of dimming, this is the adjustment of cycle-by-cycle from the LED current regulated using a potentiometer. The existing is adjusted to the LED increasing and decreasing its intensity.
The disadvantage of analogue dimming is that it only works safe provided that we dim one particular light bulb. Systems of LED lights need a more refined technique. The difficulty of dimming a process of LED lights is that we now have various types of LEDs, requiring various methods for dimming. If there is a process of lights we would like to dim, the different LEDs may react diversely towards 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 colour of the light, similarly to after it is used with incandescent lights.
Probably the most commonly used manner of dimming LEDs is Pulse-Width Modulation, that is 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, and so the longer the lights are “on” the brighter the sunshine will likely be. Here is the same technique utilized in incandescent light dimmers as well, with the exception that incandescent lights respond to current slower, and therefore demand a different frequency.
Two types of Pulse-With Modulation signals are utilized often with dimming light: the key-edge and also the trailing edge techniques. Both of these are not the same means of cutting the phase, and result in separate dimming technologies. By far the most commonly 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 work together with the key edge technology and do not include electronic transformers. TRIAC drivers, or devices governed from the DMX and digital addressable lighting interface (DALI) protocols and, in the future, can include wireless (RF) being a control option, that is dimmers that turn or slide having a knob, all work with dimmable LEDs.
Alas leading edge technologies controlled with a touch or push button, are frequently powered by an electric transformer, excluding many dimmable LEDs.
Another form of phase-cutting method is trailing edge technique, usually found in MOSFET or perhaps is not suitable for the majority of dimmable LEDs. One of the latest inventions appearing on the marketplace is the RAIS lamp technology. RAIS lamps give you a higher amount of functionality and seem to work with all sorts 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 end up being 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 dimmable power supply remain to become designed to further compatibility and better performance. While there is no general rule for what dimmer your LED may be appropriate for, always check the technical details using the distributor. Use of Leds with non-compatible dimmers might ruin the LEDs, and they are generally, at the moment, not the least expensive solution of lighting.