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Classification and Comparison of BPFC Techniques: A Review

Chen Y., Dai W.

Przegląd Elektrotechniczny

2013

R. 89, nr 2a

179--186

Power factor correction (PFC) techniques play an important role in green power and energy-saving technology. Based on conventional boost PFC, many novel topologies and control strategies of bridgeless PFC(BPFC) have been proposed, and BPFC reduces the number of devices, the losses and improves the power density as well. In this paper, it discusses and investigates a variety of low conduction losses and high power factor performance of the BPFC topological structures and identifies their merits and limitations by comparing and analysing bridgeless boost PFC,bridgeless buck PFC ,bridgeless sepic PFC and Bridgeless cuk PFC. And the trends of bridgeless PFC techniques are analyzed in the meantime. For the selection, application, and the later structural optimization of Bridgeless PFC techniques which are used in the smart grid, distributed energy and green power and other equipments.

W artykule przedstawiono omówienie badań nad bezmostkowym korektorem współczynnika mocy, mających na celu porównanie strat przewodzenia i skuteczności działania, dla różnych topologii układu. W pracy określono zalety i ograniczenia poszczególnych architektur oraz ich ewolucję. Porównano ich zastosowanie do sieci inteligentnych, energetyki rozproszonej i odnawialnej.

A numerical algorithm for obtaining an optimal temperature distribution in a 3D triple layered cylindrical skin structure

Zhang L., Dai W., Nassar R.

Computer Assisted Mechanics and Engineering Sciences

2007

Vol. 14, No. 1

107-125

In recent years, there has been interest in research related to hyperthermia combined with radiation and cytotoxic drugs to enhance the killing of tumors. The objective is to control laser heating of the tumor so that the temperature of the normal tissue surrounding the tumor remains low enough so as not to cause damage to the tissue. To achieve this objective, it is important to obtain an optimal temperature field of the entire treatment region. In this paper, we develop a numerical algorithm for obtaining an optimal temperature distribution in a 3D triple layered cylindrical skin structure by pre-specifying the temperatures to be obtained at the center and perimeter of the treated region on the skin surface. The method is comprised of designing a laser irradiation pattern, solving a 3D Pennes' bioheat equation by a numerical scheme, and optimizing the laser power.