Amongst 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 an option. However, this process only works safely when used in combination with one LED bulb. Systems of LEDs need a more sophisticated way of dimming. The 2 basic forms of dimming are the PWM or Pulse-Width-Modulation as well as the analogue dimming, each of which are switched-mode regulators. These two types are similar within the sense that they both control the time-averaged current through the diode.
Analogue dimming is an extremely simple means of dimming, this is the adjustment of cycle-by-cycle from the LED current regulated having a potentiometer. The current is adjusted for the LED increasing and decreasing its intensity.
The drawback to analogue dimming is it only works safe so long as we dim just one bulb. Systems of Leds need a more refined technique. The problem of dimming a method of LED lights is there are various kinds of LEDs, requiring various ways for dimming. If there is a method of lights we would like 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 technique of LED dimmmable 12v is Pulse-Width Modulation, that is fundamentally the cutting from the phase at a certain frequency. PWM switches the devices between fully on and fully off at a frequency that cannot be told through the eye, therefore LED bulbs always run on the forward current recommended. The regularity of switching determines the brightness of light, therefore the longer the lights are “on” the brighter the light will be. This is actually the same technique utilized in incandescent light dimmers as well, except that incandescent lights respond to current slower, and thus demand a different frequency.
2 kinds of Pulse-With Modulation signals are used often with dimming light: the key-edge and also the trailing edge techniques. These two are not the same methods for cutting the phase, and lead to 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 dimmable LEDs, since they work together with the leading edge technology and never include electronic transformers. TRIAC drivers, or devices governed from the DMX and digital addressable lighting interface (DALI) protocols and, down the road, may include wireless (RF) as being a control option, that is certainly dimmers that turn or slide with a knob, all assist dimmable LEDs. Alas leading edge technologies controlled having a touch or push button, are nzyjty powered by an electric powered transformer, excluding many dimmable LEDs.
The other kind of phase-cutting strategy is trailing edge technique, usually used in MOSFET or perhaps is not suitable for the majority of dimmable LEDs. One of many latest inventions appearing on the industry is the RAIS lamp technology. RAIS lamps provide a higher level of functionality and seem to work with all sorts of dimmers available on the market. However RAIS technology is still new, as well as its long-term influence 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’.
In the ever-evolving technologies of LED lights, led power 12v remain to be created to further compatibility and much better performance. While there is no general rule for the purpose dimmer your LED may be ideal for, check the technical details with all the distributor. Application of LED lights with non-compatible dimmers might ruin the LEDs, plus they are, right now, not the least expensive solution of lighting.