Amongst the issues of LED power supply is among the latest challenges still yet to be fully solved. Dimming LEDs is theoretically easy, because analogue dimming, which 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 modern-day way of dimming. The two basic types of dimming are the PWM or Pulse-Width-Modulation and the analogue dimming, both of which are switched-mode regulators. Those two types are similar in the sense that they both control the time-averaged current from the diode.
Analogue dimming is definitely a simple way of dimming, it will be the adjustment of cycle-by-cycle of the LED current regulated having a potentiometer. The current is adjusted for the LED increasing and decreasing its intensity.
The downside of analogue dimming is that it only works safe as long as we dim one particular bulb. Systems of LED lights demand a more refined technique. The issue of dimming a process of Leds is that there are various kinds of LEDs, requiring various methods for dimming. If you have a method of lights we want to dim, the many LEDs may react diversely for the equivalent amount of current, and as the current is reduced some LEDs can turn off later or earlier than others. Also, analogue dimming largely changes the colour of the light, similarly to when it is combined with incandescent lights.
The most commonly used manner of dimming LEDs is Pulse-Width Modulation, which is simply the cutting from the phase with a certain frequency. PWM switches the devices between fully on and fully off in a frequency that should 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, so the longer the lighting is “on” the brighter the sunshine will be. This is the same technique found in incandescent light dimmers too, with the exception that incandescent lights react to current more slowly, and for that reason demand a different frequency.
Two types of Pulse-With Modulation signals are utilized often with dimming light: the top-edge as well as the trailing edge techniques. Those two will vary means of cutting the phase, and bring about separate dimming technologies. Probably the most commonly used dimmers of LEDs use solely the leading-edge technology. Dimmers marked as R or RL are suitable for most 12V volt power supply, given that they assist 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, later on, may include wireless (RF) as a control option, that is dimmers that turn or slide with a knob, all work with dimmable LEDs.
Alas leading edge technologies controlled with a touch or push button, are frequently powered by an electrical transformer, excluding many dimmable LEDs.
Another type of phase-cutting method is trailing edge technique, usually used in MOSFET or is not suitable for the majority of dimmable LEDs. Among the latest inventions appearing on the marketplace is the RAIS lamp technology. RAIS lamps provide a higher degree of functionality and seem to work alongside all kinds of dimmers available on the market. However RAIS technology is qtjzkb new, and its long-term impact on LEDs have not been fully tested. If they end up being trustworthy their application both domestically and commercially, can grow to be much safer and easier than previous dimmable LED lights’.
In the ever-evolving technologies of Leds, led power supply 24v are still to get developed to further compatibility and better performance. While there is no general rule for what dimmer your LED might be suitable for, always check the technical details with all the distributor. Implementation of LED lights with non-compatible dimmers might ruin the LEDs, and they are generally, currently, not the cheapest solution of lighting.