Amongst the issues of LED power supply 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 method only works safely when combined with one LED bulb. Systems of LEDs demand a more sophisticated approach to dimming. The two basic types of dimming are the PWM or Pulse-Width-Modulation and 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 way of dimming, it is the adjustment of cycle-by-cycle from the LED current regulated using a potentiometer. The existing is adjusted for the LED increasing and decreasing its intensity.
The disadvantage of analogue dimming is it only works safe provided that we dim just one bulb. Systems of Leds demand a more refined technique. The issue of dimming a system of Leds is that we now have various kinds of LEDs, requiring various methods for dimming. When there is a process of lights we want to dim, the many LEDs may react diversely to the same 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 color in the light, similarly to when it is used in combination with incandescent lights.
The most commonly used technique of 12v dc power supply led is Pulse-Width Modulation, which can be simply the cutting from the phase in a certain frequency. PWM switches the devices between fully on and fully off in a frequency that can not 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 lighting will likely be. Here is the same technique utilized in incandescent light dimmers also, other than incandescent lights react to current slower, and thus require a different frequency.
2 kinds of Pulse-With Modulation signals are used often with dimming light: the key-edge as well as the trailing edge techniques. These two are different ways of cutting the phase, and result in 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 assist the top 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, down the road, might include wireless (RF) as being a control option, that 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 nzyjty powered by an electrical transformer, excluding many dimmable LEDs.
The other type of phase-cutting method is trailing edge technique, usually found in MOSFET or is not suitable for almost all dimmable LEDs. One of many latest inventions appearing on the marketplace is the RAIS lamp technology. RAIS lamps give you a higher degree of functionality and seem to do business 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. If they turn out to be trustworthy their application both domestically and commercially, can grow to be much safer and simpler than previous dimmable LED lights’.
In the ever-evolving technologies of Leds, LED Constant Voltage Waterproof Power Supply remain to be created to further compatibility and much better performance. As there is no general rule for which dimmer your LED might be ideal for, always check the technical details using the distributor. Implementation of LED lights with non-compatible dimmers might ruin the LEDs, and they are, currently, not the most affordable solution of lighting.