Abstract
We present the bidirectional power line communication system developed in parallel to an electronic board for driving and control of HID (high-intensity discharge) and LED (light-emitting diode) lamps. The communication system, developed to be applied in the sector of public illumination, is been designed to combine high efficiency and reliability with low production costs; it consists indeed of discrete cheap components. The communication system described in this paper implements the technique of transporting digital information over existing power lines, avoiding the issue of installing new cables. Digitized signals can use power line cables through the amplitude voltage and current modulation. The solution proposed is more advantageous compared to communication techniques currently on the market which are essentially two types, power line carrier (modem for high-voltage lines) or radio (zig-Bee transceiver).
Highlights
Public lighting represents a primary service in the management of a city
This feature allows to use the ballast in lighting systems that nowadays use the traditional discharge lamps and, primarily, will allow to keep the same ballast when discharge lamps will be replaced by the LED modules, in the near future in which the LED street lighting systems will be more affordable
Slaveto-master communication is implemented modulating the voltage amplitude, while the slave-to-master communication is done modulating the current amplitude. This communication system has been tested in the laboratory, in both directions, connecting through cable lines long about two meters, slave circuits with the master electronic board
Summary
Public lighting represents a primary service in the management of a city. It is public safety guarantor, helps to improve the environment in which people live, and promotes city image through the enhancement of cultural heritage. It is extremely problematic and expensive to make early detection of malfunctioning components, to locate and remove the cause of failures, to carefully manage the lighting implant, and to control the luminous flux of each unit All this involves high costs in terms of time and money. The designed transmission system, applied to a public lighting system, allows transmission of information between the control panel and the lighting points, through the power line; it is not required the installation of additional cables This peculiarity, together with the use of relatively economical discrete components for the realization of the transmitter and receiver units, ensures low production costs, simple construction and maintenance of the system and a good overall reliability; this is certainly the main advantage of the designed communication module
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