Modification of the Dimming Control Method for LED Lighting Using PLC Technology

A modification of the amplitude modulation method used in the PLC technology for transmitting dimming commands to LED lighting devices via power lines is considered. The existing method of amplitude modulation is based on the skipping of individual half-waves of the supply voltage to form a marker. Passing half-waves leads to a significant deterioration in the quality of the supply voltage, leading to flickering of the fixtures. To form a marker it is suggested not to pass the half-wave, but to reduce its amplitude by 10...15%, which will have little effect on the quality of the supply voltage. Examples of structural diagrams of external and internal lighting systems are considered, which make it possible to implement the proposed solution, describes the format of the command for controlling the dimming level of luminaires. Practical embodiments of the modulator on the side of the control device are proposed. The oscillogram of the generated supply voltage with a dimming command is given. The features of the functional units of the demodulator on the side of the lighting devices are considered. It is shown that the area of application of the modified technology is potentially wider than lighting control.