One of the issues of led power supply 12v is probably the latest challenges still yet to be fully solved. Dimming LEDs is theoretically easy, because analogue dimming, which is the adjustment of current, is definitely an option. However, this technique only works safely when used with one LED bulb. Systems of Light emitting diodes require a more sophisticated way of dimming. The 2 basic kinds 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 definitely a simple way of dimming, it will be the adjustment of cycle-by-cycle from 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 so long as we dim a single bulb. Systems of LED lights demand a more refined technique. The difficulty of dimming a system of LED lights is that there are various kinds of LEDs, requiring different methods for dimming. If there is a process of lights we want to dim, the different LEDs may react diversely towards the same 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 in 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 from the phase in a certain frequency. PWM switches the devices between fully on and fully off at a frequency that should not be told through the human eye, therefore LED bulbs always run on the forward current recommended. The frequency of switching determines the brightness of light, and so the longer the lighting is “on” the brighter the lighting will be. This is the same technique utilized in incandescent light dimmers as well, other than incandescent lights react to current more slowly, and therefore need a different frequency.
2 kinds of Pulse-With Modulation signals are employed 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 result in separate dimming technologies. The most commonly used dimmers of LEDs use solely the leading-edge technology. Dimmers marked as R or RL are compatible with most 12 volt dimmable led lights, since they assist the key 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, in the future, might include wireless (RF) being a control option, that is certainly dimmers that turn or slide having a knob, all work together with dimmable LEDs.
Alas leading edge technologies controlled with a touch or push button, are often powered by an electric powered transformer, excluding many dimmable LEDs.
The other type of phase-cutting technique is trailing edge technique, usually used in MOSFET or perhaps is not suitable for the majority of dimmable LEDs. One of the latest inventions appearing on the market is the RAIS lamp technology. RAIS lamps provide a higher amount of functionality and seem to do business with all sorts 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 turn out to be trustworthy their application both domestically and commercially, can come to be much safer and simpler than previous dimmable LED lights’.
Inside the ever-evolving technologies of LED lights, led power supply 24v continue to be to be developed to further compatibility and better performance. Since there is no general rule for which dimmer your LED could be suitable for, check the technical details using the distributor. Application of Leds with non-compatible dimmers might ruin the LEDs, plus they are, right now, not the least expensive solution of lighting.