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Reduction of Harmonics Contained in the Input Power Supply Dynamic Tool for Current Source Full-Bridge Inverter Based Induction Heater

Roy D., Sadhu P. K., Pal N.

Przegląd Elektrotechniczny

2015

R. 91, nr 4

123--126

This paper highlights an approach to drastically minimize the injection of unwanted harmonics to the input power supply incorporating an LC low-pass filter (LPF) which is fitted in between the high frequency current source full bridge inverter used in induction heater and input power supply. This LPF protects the other consumers those are connected on the same power line from the spurious signals. Fast Fourier Transform (FFT) has been used to perceive between the fundamental and the unwanted harmonics. It is a better analytic tool for diagonising all spurious signals in the frequency domain. From the result of PSIM simulation, it has been established that the Total Harmonic Distortion (THD) get reduced drastically from 49.63% to below 4.768% by incorporating the LPF.

W artykule opisano metodę minimalizacji zawartości harmonicznych w wysokoczęstotliwościowym pełno-mostkowym przekształtniku stosowanym do nagrzewania indukcyjnego. Zastosowany filt dolnoprzepustowy chroni innych użytkowników sieci przed niepożądanymi zakłóceniami.

Usefulness of computer graphics applications in design work on complex lighting systems

Wachta H.

Poznan University of Technology Academic Journals. Electrical Engineering

2010

No. 61

197-205

In the paper, two examples of use of computer tools in design work on lighting systems covering complex catoptric systems of lighting fittings and extensive illumination systems are presented. In both cases, application of numerical calculation methods allows to analyze large numbers of test rays reflected from optically active surface of the catoptric element or from the object's elevation. As a result of such approach, it becomes possible to develop catoptric elements realizing precisely predetermined lighting tasks and create illumination arrangements meeting specific aesthetic criteria.