Among the issues of led light transformer is among 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 technique only works safely when combined with one LED bulb. Systems of LEDs need a more sophisticated method of dimming. The two basic types of dimming are the PWM or Pulse-Width-Modulation and also 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 through the diode.
Analogue dimming is an extremely simple method of dimming, it is the adjustment of cycle-by-cycle in the LED current regulated having a potentiometer. The present is adjusted for the LED increasing and decreasing its intensity.
The drawback to analogue dimming is that it only works safe so long as we dim one particular light. Systems of LED lights demand a more refined technique. The difficulty of dimming a process of LED lights is there are many types of LEDs, requiring various ways for dimming. If there is a method of lights we wish to dim, the different LEDs may react diversely for the same amount of current, and because the current is reduced some LEDs can make off later or earlier than others. Also, analogue dimming largely changes the color of the light, similarly to after it is used in combination with incandescent lights.
The most frequently used manner of LED dimming power supply is Pulse-Width Modulation, that is basically the cutting of the phase in a certain frequency. PWM switches the devices between fully on and fully off in a frequency that can not be told from 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 will be. Here is the same technique found in incandescent light dimmers as well, except that incandescent lights respond to current slower, and therefore require a different frequency.
Two kinds of Pulse-With Modulation signals are employed often with dimming light: the leading-edge and the trailing edge techniques. Those two are not the same ways of cutting the phase, and result in separate dimming technologies. Probably the most commonly used dimmers of LEDs use solely the key-edge technology.
Dimmers marked as R or RL are compatible with most dimmable LEDs, because they work together with the top edge technology and you should not include electronic transformers. TRIAC drivers, or devices governed by the DMX and digital addressable lighting interface (DALI) protocols and, in the future, might include wireless (RF) as being a control option, that is dimmers that turn or slide with a knob, all assist dimmable LEDs. Alas leading edge technologies controlled using a touch or push button, are nzyjty powered by an electric powered transformer, excluding many dimmable LEDs.
One other type of phase-cutting technique is trailing edge technique, usually found in MOSFET or is not suitable for the majority of dimmable LEDs. One of the latest inventions appearing on the industry is the RAIS lamp technology. RAIS lamps provide a higher level of functionality and seem to do business with all types of dimmers available on the market. However RAIS technology remains new, as well as its long term impact on LEDs have not been fully tested. Should they turn out to be trustworthy their application both domestically and commercially, can come to be much safer and easier than previous dimmable LED lights’.
Within the ever-evolving technologies of Leds, LED ac110VDC12V driver are still to get developed to further compatibility and performance. While there is no general rule for which dimmer your LED may be ideal for, always check the technical details using the distributor. Use of LED lights with non-compatible dimmers might ruin the LEDs, and they are, currently, not the most affordable solution of lighting.
