Abstract
Solid state lighting is nowadays widely diffused both in residential and office or industrial environment. Ambient light sensing to modulate lamp power is typical too, but sensors inside a lamp are a challenge, due to the high flux of these sources, which easily saturates nearby light detectors. Usually, separate sensing devices must be introduced in the system, thus increasing complexity and cost. In this work, a methodology will be presented, to allow integration of a light sensing device inside a lamp, using low cost circuitry to mitigate interactions between high power light-emitting diode (LED) sources and sensing photodiodes. Moreover, the same circuit allows visual light communication among sources.
Highlights
Usage of white light-emitting diode (LED) as light sources is rapidly pervading the market, with large scale marketing starting around 2010
This current is not perfectly constant, and it is slightly modulated at two times the AC line frequency, in order to satisfy High Power Factor (HPF)
A practical implementation has been realized, in order to be inserted in standard
Summary
Usage of white LEDs as light sources is rapidly pervading the market, with large scale marketing starting around 2010. Specific characteristics of LEDs, seen as electronic devices, opened new usage perspectives, as they are dramatically different from their predecessors. Quasi linear dependence of light flux from the current passing through the LED. This relationship allows for modulating the total emitted power just controlling the supplied current, leading to accurate light dimming in the environment. This can be used to save energy, or to improve user experience. Typical characteristics of such LED sources are described in [3]
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