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- Intelligent led driver controller how to#
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Intelligent led driver controller full version#
To read the full version of this article, please visit our magazine page, where you can download FREE electronic PDF versions of all issues of LEDs Magazine. This article was published in the April 2010 issue of LEDs Magazine. The electronics required have been called lighting ballasts or power supplies but are commonly and collectively referred to as LED drivers.
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Intelligent led driver controller how to#
Others outsourced their designs to competent power and analog engineers who spent a lifetime learning how to drive the power circuits and constant current required by LEDs. Many who took the initial steps in electronics produced sub-par products and had to redesign their products to get more efficient and optimal results. They discovered that they needed serious engineering disciplines to implement new electronics, optics and thermal technologies. Many early adopters of LED technologies for lighting started out thinking the move would be a simple evolutionary step but quickly found out that the move was revolutionary.
Intelligent led driver controller drivers#
Companies can purchase off-the-shelf LED driver modules, although recent advances in driver ICs will allow many companies to design their own intelligent drivers with optimized feature sets such as dimming, color control, and sensors. SSL brings many new challenges for those looking to redesign lighting fixtures or design retrofit lamps for existing Edison sockets. It utilises the fact that instantaneous values of diode's current and voltage correspond uniquely to a set of diode's colorimetric properties, like tristimulus values.Countless number of lighting companies and engineering houses are jumping into the general illumination business with the advances and opportunities created by LED-based solid-state lighting (SSL) technologies. A current-voltage model of light-emitting diode is presented. Simulations show that the gamut of the device can be increased, especially in the cyan colour range for \rgb luminaires. Introduction of hybrid dimming mechanism creates three additional degrees of freedom therefore luminaire parameters such as luminous flux, efficacy and colour quality can be maximised. Also, minimisation of peak wavelength shift was observed for InGaN diodes.Ĭontrol of trichromatic luminaires, dimmed with either pulse-width modulation or amplitude modulation, cannot be optimised.
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It has been shown that it is possible to compensate for temperature drift of white diode's colour point using hybrid dimming strategy. This increases the controllability of the diode giving new optimisation possibilities. It has been shown previously, that these two methods yield different effects on diode's efficacy and colour point.Ī hybrid dimming strategy has been proposed where two variable quantities control the intensity of the diode. Typically, the drivers operate as a current source and the intensity of the diode is controlled either by varying the magnitude of the current or by driving the LED with a pulsed current and regulate the width of the pulse. The function of LED driver is to supply the diode with power needed to achieve the desired intensity. After receiving control data and power from the PoE gateway, the LED driver can respond to information and drive tasks based upon a coordinated design, control, and management system emanating from the connected network.
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Contrary to traditional light sources like incandescent and high-intensity discharge lamps, where colour is generated using filters, LEDs use additive light mixing, where the intensity of each primary colour diode has to be adjusted to the needed intensity to generate specified colour. Intelligent LED drivers supply the appropriate power and conditioning signals for the LED engine. High power light-emitting diodes allow the creation of luminaires capable of generating saturated colour light at very high efficacies.