Simulation of Led Lighting System with Transmission of Control Commands Via the Power Supply Line
The aim of the work is the construction and study of a simplified model of a LED lighting line with controlled lights to assess the applicability of lighting control for long lines. To transmit control commands, low-frequency PLC technology is used, in which information is encoded by the number of half-waves of the mains voltage located between the markers, which are half-waves modulated in amplitude. The parameters of modern power supplies used in LED technology are considered. It is shown that the applied power sources have a high power factor, a wide range of input voltages, and have a sinusoidal shape of the current consumption. A high-quality power source with a power factor corrector is actually a load in which the current is minimally ahead of the voltage, which allows us to consider the power source as an active resistance. The dimmable power supply of IPS50-350TU LED lamps was experimentally studied. Oscillograms of the input voltage and current are compared, the sinusoidal shape of the input current is confirmed, the voltage current is outstripped by an angle of 4.3 degrees. In the Matlab environment, a simplified model of an LED lighting system for long lines was developed and modeled. As input variable parameters, the length of the line, the cross section of the supply wire, the parameters of the power source of the lamp, the number of lighting devices in the line are used. Time diagrams of voltage at the far end of the line were received and analyzed during transmission of control commands. It is shown that the developed model makes it possible to obtain a voltage form in the line and form requirements for the receiver-demodulator control commands installed in the fixtures. The obtained simulation results were used in the development of a dimmable LED lighting system. A central lighting control cabinet has been developed with implemented control functions on the power line, as well as command receivers-demodulators located in the luminaries and setting the dimming level of LED lamps.