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The paper presents synthesis and comparison of several drivers of original topologies for LED dimming. The work is based on the hypothesis that the direct current control, in contrast to indirect voltage control, is very useful in LED applications where luminous flux is almost proportional to LED's current. In order to confirm or disprove this hypothesis,(More)
Smart lighting grids, consisted of smart luminaries with capability to communicate with each other, have great potential to reduce power consumption in the sphere of artificial illumination. This paper provides comparative study of concentrated, localized or distributed control approaches of smart lighting grids and summarizes mentioned approaches by(More)
There are two basic ways to improve the energy efficiency of lighting equipment — utilization of more effective technologies of light generation and implementation of intelligent control of lighting (providing the light where and when it is needed). LED lighting technology provides both these opportunities: LED luminaries have high efficacy and it is(More)
Accurate grid synchronization unit is essential for reliable operation of grid converters. Single-phase unit may utilize measured function and its digital derivative as the base for PLL. This paper compares some solutions of accuracy problems typical for such derivative approach: oversampling of measurements, interleaved calculation of derivative and(More)
Amplitude mode LEDs light regulation is most functional when LEDs are supplied from current fed buck drivers, which practical implementation is conjunction of non-inverting buck-boost circuit, extra coil and specific control methods. This report experimentally evaluates the efficiency of driver's versions making focus on their losses and possible electric(More)
The high power LED driver based on non-inverting buck-boost converter is considered in this paper. The special regulation approach of this converter is described in order to simplify the control strategy. Thus, the implementation of this control strategy in microcontroller based closed loop regulation system allows to increase number of regulation steps (to(More)
This paper discuss the problems regarding to traditional teaching methods and possible improvement of student practical knowledge base in RTU study program “Computerized Control of Electrical Technologies” by offering interlinked task between many courses and utilization of Light Emitting Diode (LED) related equipment in the course of power(More)