Among 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 more sophisticated approach to dimming. The 2 basic types of dimming are the PWM or Pulse-Width-Modulation and also the analogue dimming, both of which are switched-mode regulators. These two types are similar within the sense that they both control the time-averaged current from the diode.
Analogue dimming is a very simple way of dimming, this is the adjustment of cycle-by-cycle of the LED current regulated having a potentiometer. The current is adjusted to the LED increasing and decreasing its intensity.
The downside of analogue dimming is it only works safe as long as we dim just one light bulb. Systems of LED lights need a more refined technique. The problem of dimming a system of LED lights is that we now have many types of LEDs, requiring various ways for dimming. If there is a method of lights we would like to dim, the various LEDs may react diversely towards the equivalent amount of current, and as the current is reduced some LEDs can change off later or sooner than others. Also, analogue dimming largely changes the color of the light, similarly to when it is used in combination with incandescent lights.
By far the most frequently used technique of dimming LEDs is Pulse-Width Modulation, which can be simply the cutting in the phase with a certain frequency. PWM switches the devices between fully on and fully off in 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 lighting is “on” the brighter the light is going to be. Here is the same technique found in incandescent light dimmers too, except that incandescent lights respond to current slower, and thus need a different frequency.
Two kinds of Pulse-With Modulation signals are used often with dimming light: the top-edge as well as the trailing edge techniques. Both of these will vary ways of cutting the phase, and bring about separate dimming technologies. The most commonly used dimmers of LEDs use solely the key-edge technology. Dimmers marked as R or RL are compatible with most power supply light, given that they work together with the leading edge technology and you should not include electronic transformers. TRIAC drivers, or devices governed from the DMX and digital addressable lighting interface (DALI) protocols and, down the road, might include wireless (RF) as being a control option, which is dimmers that turn or slide using a knob, all work with dimmable LEDs.
Alas leading edge technologies controlled with a touch or push button, tend to be powered by an electric powered transformer, excluding many dimmable LEDs.
Another kind of phase-cutting technique is trailing edge technique, usually used in MOSFET or possibly is not suitable for almost all dimmable LEDs. Among the latest inventions appearing on the marketplace is the RAIS lamp technology. RAIS lamps provide a higher amount of functionality and seem to work with all sorts 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. When they prove to be trustworthy their application both domestically and commercially, can grow to be much safer and simpler than previous dimmable LED lights’.
Within the ever-evolving technologies of Leds, LED ac110VDC12V driver continue to be to become created to further compatibility and much better performance. While there is no general rule for which dimmer your LED could be suitable for, always check the technical details using the distributor. Use of LED lights with non-compatible dimmers might ruin the LEDs, plus they are, currently, not the least expensive solution of lighting.