In the context of Intelligent Lighting System various lighting devices and technologies are compared. For the most technically beneficiary and rapidly developing LED luminaries control and power supply methods are analyzed and experimentally tested. The optimal one is chosen. Outlines of the further research are defined.

The interleaved multilevel DC-DC converters have advantages of low voltage stress of the switches and diodes and reduction of filter size. Particularly series input parallel output (ISOP) configuration is well suited for high output voltage and large output current application but input series output series (ISOS) configuration enable the utilization of low voltage rating switches in high voltage input and high voltage output applications that require galvanic isolation. The series connection of the isolated DC-DC converters at the input side also can be used for higher voltage application. While multilevel topology offers many new features, it also necessitates a balance control of the input capacitors. The paper describes the operating principles of the balancing circuit, analyzes the fundamental relationships, introduces principles of the operation of the circuit. The paper shows experimental results based on a few practical application examples. The paper discusses design of the transformer with balancing winding for ISOP, ISOS and parallel connection of the DC-DC converters to provide independent voltage balancing of input capacitors.

This paper analyzes the most significant details of development of a modern luminary. One of the effective ways to improve the energy efficiency of lighting systems and luminaries is to use the so called smart luminaries. This means that the luminaries turn on exactly at the place and time when the light is required, as well as with the required intensity of light. Such approach is especially effective if LED elements are utilized. Development of the smart LED luminaries includes several tasks: elaboration of energy efficient power supply equipped with distance controllable dimming function; choice and implementation of sensors; choice and development of communications for data exchange between luminaries, sensors and overall control system. The paper briefly describes the main problems of development of the smart lighting systems with LEDs as well as their solutions.

Instantaneous current measurement increases the cost and size of the control system in switched-mode power supplies. This paper presents the first attempt to apply current sensorless control in conjunction with a half-bridge converter. The proposed single-loop current sensorless control algorithm allows shaping sine-form current in the rectifier mode by using only one voltage control loop (no current loop is needed) to stabilize the DC bus voltage. Mathematical equations were defined for capacitor voltages, inductor current peaks, and transistor conduction time during discontinuous conduction mode and continuous conduction mode. The verification of our theoretical assumptions and analytical equations were confirmed by the simulation and experimental analysis. Applications of the proposed control approach are described in the conclusions.

This paper identifies the problem of the non-intrusive load monitoring method of load disaggregation into separate appliances, when some local generators based on renewable energy sources are connected to the same grid, as they may be mismatched with loads variable in time. Three approaches of electrical energy consumption disaggregation from the energy generated from local renewable energy sources are described.