understanding intelligent lighting design, part 1
From MR16 bulbs suitable for home lighting to powerful PAR floodlights and LED growth lights, LED achieves almost unlimited diversity and specialization.
In the consumer and industrial lighting market, LED lights replace traditional products of the same kind, LED product developers are facing a series of challenges.
The ability to create smart lighting devices, including sensors and dimmers, requires conversion in a language that describes LED lighting.
In addition to understanding lux and color requirements, lighting designers need more.
Expanding developers in Led lighting technology sometimes struggle to integrate smart features into their designs and describe these advances to suppliers and potential business partners.
A basic understanding of the basics of intelligent LED lighting design will help developers and suppliers to communicate more clearly about future projects.
While dimming may seem simple enough, the issue of whether dimming is a necessary design function can be very complicated.
If the answer is yes, then there are a few factors that will work and each brings a unique challenge.
Many fixtures, such as MR16 bulbs, for indoor lighting, are designed for low voltage, with 12 CAV (
Or 24 VAC input.
This makes the design one with most TRIAC (
Three Poles of AC)
The dimmer is already in use.
Some companies have or are developing drivers with this capability.
More options for dimming higher voltage fixtures.
At the top of the range are a few 277V dimmers for high-bay lighting.
The next challenge to consider is dimming control.
The TRIAC design does not consider LED lighting, and a given AC/dc led driver may not even be able to use about half of the usual TRIAC dimmer.
In addition, drivers sometimes fail to explain the high and low end of TRIAC, severely limiting the effective dimming range, especially at the low endvoltage end.
Since a typical AC/DC driver is not designed for a micro-controller with a 5v input rail, AC power management becomes necessary when the micro-controller is used for dimming control.
In addition, the input signal is required to adjust the output dimming waveform adjustment.
All of this may require the integration of the communication network into the luminaire to deliver dimming information.
The dimming performance of the dimming circuit is not exactly the same, introducing the problem of dimming quality.
Usually, PWM (pulse-
Signal for dimming.
PWM is a digital waveform that modifies the power transfer according to the duty cycle of PWM. EMI noise (
LED lights sometimes flash.
Therefore, it is necessary for lighting developers to find low
Sound insulation solutions, such as drivers, regulate the half of the PWM signalrandom basis.
The digital output also affects how smooth the dimmer works.
For example, when dimming a series of simultaneous LED bulbs using 8-1, only 256 steps are possiblebit PWM.
Users can see these dimming steps, especially at the low end of the dimmer. A 16-
Bit PWM allows 65,000 dimming steps to achieve smoother dimming performance.