Showing papers presented at "European Conference on Power Electronics and Applications in 1993"

Residential solar-powered air conditioner

Abstract: The power demand in Japan yearly increases especially in summer, and becomes peak in the daytime. The main cause is the drastically increased load of air conditioners widely used in general homes. The load pattern of air conditioners is very similar to the output pattern of a photovoltaic (PV) array.Therefore, Sanyo has been developing two types of residential solar-powered air conditioner. One is a uni-directional system by using a DC/DC converter, which controls the voltage of a PV array at its optimal operation point and boosts the voltage up to the DC voltage of an inverter-type air conditioner. The other is a bi-directional system by using a bi-directional current-control converter, which regenerates surplus power into commercial system from a PV array, and suppresses the input current distortion of an air conditioner.In this paper, the configurations and experimental results are described and discussed.

A multiphase series-resonant converter with a reduced number of thyristors and common grounds for inputs and outputs

Abstract: Multiphase series-resonant (SR) power converters provide a flexible way to transform power between a utility grid and a multiphase load or source. The current implementations all suffer from a high component count, which makes the use of these converters unattractive from an economical point of view. A new topology for multiphase SR converters has been proposed in (l) in a simulation context. This topology uses half the number of power semiconductors compared to the existing multiphase SR converters. The present paper addresses the implementation of the new topology in a prototype converter. Simulation data and measured waveforms are shown, and a comparison is made between the new and the existing topologies. It is shown that the economical gain due to the reduction in component count is offset by a lower power rating.