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The aim of the article is to design a system for yearly automatic control of street lighting. The idea is to increase the energy efficiency by switching ON the lights only in the dark part of the day. Using GPS coordinates and the trajectory of the sun, the time for switching the lights ON and OFF varies depending on the day of the year. The electronic system for monitoring and control of street lighting system is designed and developed on the basis of the IoT concept. The fundamental principle of the operation is based on the transmission and reception of information via GPRS, GPS and GSM network to a built physical server, connected in one way or another to the Internet network and receiving position data and accurate time from the GPS navigation system.

The increase of the LED’s temperature above a certain threshold decreases significantly their live expectancy. Therefore, it is important to investigate LEDs’ thermal regime during the design process in different conditions for exploitation. The influence of the construction and the environment parameters on the thermal regime of LED lamp was investigated in this paper. The study was done with a specially developed software, based on a model, describing the thermal regime of LED lamps. Next, a methodology for the research has been developed and a simulation study was carried out. The results of this investigation are represented graphically.

The paper discusses the electronic control of induction heater power converter for ferromagnetic materials melting. The system is built on the base of a bridge schematic of power amplifiers, which includes three separate power amplifiers, as each of them is power supplied by three-phase supply line. The operating frequency of the equipment ranges from 25 kHz to 400 kHz, depending on the resonant frequency of the output resonant circuit. The maximum power of the equipment is 10kW.

The article elaborates the design and construction of automatic light control system. The developed electronic system eliminates the disadvantages of the existing systems by taking date and time from the GPS, as it also gives information about the position of the system. Based on the results the microcontroller calculates and automatically detects geographical area and retrieve relevant data for sunrise and sunset in the area, respectively ensures very precise ON/OFF mode of the lighting system. It doesn't need operator maintenance and initial installation setup. The developed electronic device increases bulb life in result of the dimming effect. On the other hand this decrease of the illumination leads to reduce in the energy consumption.