Showing papers by "Nitte Meenakshi Institute of Technology published in 2008"
TL;DR: In this article, the authors presented the operating principle of the new family of soft transition converters; the methodology of design of these converters is presented through an example and the standard dynamic performance functions of the converters are readily obtainable from this model.
Abstract: The soft switching converters evolved through the resonant load, resonant switch, resonant transition and active clamp converters to eliminate switching losses in power converters. This paper briefly presents the operating principle of the new family of soft transition converters; the methodology of design of these converters is presented through an example. In the proposed family of converters, the switching transitions of both the main switch and auxiliary switch are lossless. When these converters are analysed in terms of the pole current and throw voltage, the defining equations of all converters belonging to this family become identical. Such a description allows one to define simple circuit oriented model for these converters. These circuit models help in evaluating the steady state and dynamic model of these converters. The standard dynamic performance functions of the converters are readily obtainable from this model. This paper presents these dynamic models and verifies the same through measurements on a prototype converter.
2 citations
01 Oct 2008
TL;DR: In this article, the electric field variation between point plane gaps along point electrode axis does not vary considerably (less than 0.5%) over several mean free paths in atmospheric air, which suggests that the positive polarity corona inception voltages can be calculated for these types of gaps as voltage of point electrode that causes electron multiplication to be 106.
Abstract: Numerical analysis of electric field variation between point plane electrode configuration have been carried out by few investigators using charge simulation method. In order to analyse corona performance in air at atmospheric pressure, electric field computations between point plane gaps have been carried out using ANSYS software version 9.0 (multiphysics). The software uses finite element method for analysis. For values of hemispherical tip diameter of 1.0 mm and above the electric field variation between point plane gaps along point electrode axis does not vary considerably (less than 0.5%) over several mean free paths in atmospheric air. From these considerations, corona inception potentials have been computed in air at atmospheric pressure between point plane gaps using Townsend's theory applicable to non uniform fields. The computations have been carried out for values of tip diameter 1.0 mm, 2.0 mm, 3.0 mm and for gap distances varying from 20 mm to 50 mm (approximately) for positive polarity of the tip in the present work. The computed corona inception potentials showed good agreement (within plusmn 10%) with experimental results reported in literature. This suggests that the positive polarity corona inception voltages can be calculated for these types of gaps as voltage of point electrode that causes electron multiplication to be 106.
2 citations