Amongst the issues of led power supply 12v 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 long been a choice. However, this technique only works safely when used with one LED bulb. Systems of Light emitting diodes demand a modern-day method of dimming. The two basic types of dimming are the PWM or Pulse-Width-Modulation and also the analogue dimming, both 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 way of dimming, it will be the adjustment of cycle-by-cycle of the LED current regulated using a potentiometer. The current is adjusted for the LED increasing and decreasing its intensity.
The disadvantage of analogue dimming is it only works safe so long as we dim just one light. Systems of LED lights require a more refined technique. The issue of dimming a process of LED lights is that we now have various types of LEDs, requiring different methods for dimming. If you have a method of lights we would like to dim, the many LEDs may react diversely towards the equivalent amount of current, and because the current is reduced some LEDs can make off later or sooner than others. Also, analogue dimming largely changes the colour in the light, similarly to after it is combined with incandescent lights.
By far the most frequently used technique of dimming LEDs is Pulse-Width Modulation, which can be basically the cutting from the phase at a certain frequency. PWM switches the devices between fully on and fully off with a frequency that can 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, and so the longer the lighting is “on” the brighter the lighting will likely be. This is actually the same technique found in incandescent light dimmers too, except that incandescent lights react to current more slowly, and for that reason require a different frequency.
2 kinds of Pulse-With Modulation signals are utilized often with dimming light: the top-edge and the trailing edge techniques. These two are not the same means of cutting the phase, and lead to separate dimming technologies. Probably the most frequently used dimmers of LEDs use solely the leading-edge technology. Dimmers marked as R or RL are compatible with most LED dimmmable 12v, given that they work together with the key edge technology and never 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 being a control option, which is dimmers that turn or slide with a knob, all work together 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.
The other type of phase-cutting technique 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 degree of functionality and seem to work with all types of dimmers available on the market. However RAIS technology is qtjzkb new, as well as its long-term effect on LEDs have not been fully tested. Should they prove to be trustworthy their application both domestically and commercially, can grow to be much safer and much easier than previous dimmable LED lights’.
Inside the ever-evolving technologies of LED lights, led power 12v are still to become designed to further compatibility and performance. While there is no general rule for what dimmer your LED may be appropriate for, make sure the technical details using the distributor. Implementation of LED lights with non-compatible dimmers might ruin the LEDs, plus they are, right now, not the cheapest solution of lighting.