Among the issues of led power supply 12v is probably the latest challenges still yet to be fully solved. Dimming LEDs is theoretically easy, because analogue dimming, that is the adjustment of current, has long been a choice. However, this method only works safely when used with one LED bulb. Systems of LEDs demand a more sophisticated method of dimming. The 2 basic forms 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 from the diode.
Analogue dimming is an extremely simple way of dimming, this is the adjustment of cycle-by-cycle of the LED current regulated with a potentiometer. The current is adjusted towards the LED increasing and decreasing its intensity.
The drawback to analogue dimming is it only works safe as long as we dim a single light. Systems of Leds need a more refined technique. The issue of dimming a process of LED lights is that we now have various kinds of LEDs, requiring various ways for dimming. If you have a system of lights we wish to dim, the many LEDs may react diversely to the equivalent amount of current, and because the current is reduced some LEDs can turn off later or sooner than others. Also, analogue dimming largely changes the colour in the light, similarly to after it is used with incandescent lights.
By far the most frequently used manner of dimming LEDs is Pulse-Width Modulation, that is simply the cutting in the phase at a certain frequency. PWM switches the devices between fully on and fully off with a frequency that cannot be told by 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 light will likely be. Here is the same technique found in incandescent light dimmers too, except that incandescent lights respond to current more slowly, and therefore demand a different frequency.
2 kinds of Pulse-With Modulation signals are utilized often with dimming light: the key-edge and the trailing edge techniques. These two are not the same ways of cutting the phase, and bring about separate dimming technologies. By far the most commonly used dimmers of LEDs use solely the leading-edge technology. Dimmers marked as R or RL are suitable for most LED dimming diver, because they work together with the leading edge technology and do not include electronic transformers. TRIAC drivers, or devices governed from the DMX and digital addressable lighting interface (DALI) protocols and, later on, might include wireless (RF) being a control option, which is dimmers that turn or slide using 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 powered transformer, excluding many dimmable LEDs.
Another kind of phase-cutting technique is trailing edge technique, usually utilized in MOSFET or is not suitable for almost all dimmable LEDs. One of many latest inventions appearing on the industry is the RAIS lamp technology. RAIS lamps give you a higher degree of functionality and seem to work alongside 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. If 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’.
Within the ever-evolving technologies of LED lights, LED dimmable diver remain to get developed to further compatibility and much better performance. As there is no general rule for the purpose dimmer your LED could be appropriate for, make sure the technical details with all the distributor. Application of LED lights with non-compatible dimmers might ruin the LEDs, plus they are, currently, not the cheapest solution of lighting.