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, that is the adjustment of current, has always been an option. However, this method only works safely when used with one LED bulb. Systems of LEDs require a more sophisticated approach to dimming. The 2 basic types of dimming are definitely the PWM or Pulse-Width-Modulation as well as the analogue dimming, both of which are switched-mode regulators. These two types are similar in the sense that they both control the time-averaged current through the diode.
Analogue dimming is definitely a simple means of dimming, this is the adjustment of cycle-by-cycle of the LED current regulated using a potentiometer. The existing is adjusted to the LED increasing and decreasing its intensity.
The disadvantage of analogue dimming is that it only works safe as long as we dim just one light. Systems of LED lights demand a more refined technique. The issue of dimming a process of Leds is that there are various types of LEDs, requiring various ways for dimming. If you have a system of lights we want to dim, the various LEDs may react diversely towards the equivalent amount of current, and as the current is reduced some LEDs can turn off later or sooner than others. Also, analogue dimming largely changes the colour from the light, similarly to when it is used with incandescent lights.
Probably the most frequently used manner of 12v dc power supply led is Pulse-Width Modulation, that is simply the cutting of the phase with a certain frequency. PWM switches the devices between fully on and fully off in a frequency that should not be told through the eye, therefore LED bulbs always run on the forward current recommended. The frequency of switching determines the brightness of light, therefore the longer the lighting is “on” the brighter the lighting is going to be. This is actually the same technique found in incandescent light dimmers as well, with the exception that incandescent lights react to current more slowly, and thus require a different frequency.
Two kinds of Pulse-With Modulation signals are used often with dimming light: the top-edge and also the trailing edge techniques. Both of these are not the same means of cutting the phase, and lead to separate dimming technologies. Probably the most commonly used dimmers of LEDs use solely the key-edge technology.
Dimmers marked as R or RL are suitable for most dimmable LEDs, because they assist the key edge technology and do 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 a control option, which 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 used in MOSFET or is not suitable for the majority of dimmable LEDs. One of many latest inventions appearing on the marketplace is the RAIS lamp technology. RAIS lamps give you a higher level of functionality and seem to do business with all kinds of dimmers available on the market. However RAIS technology is still new, and 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 easier than previous dimmable LED lights’.
Inside the ever-evolving technologies of Leds, LED ac110VDC12V driver remain to become created to further compatibility and performance. While there is no general rule for the purpose dimmer your LED could be ideal for, make sure the technical details with all the distributor. Implementation of Leds with non-compatible dimmers might ruin the LEDs, plus they are, at the moment, not the cheapest solution of lighting.