Projeto de uma fonte de corrente para máquinas de corte a plasma baseado no conversor CC-CC meia ponte

Abstract

Plasma cutting is among the most used methods, in the cutting of metal sheet, by the metallurgical industry. The plasma generation process is part of an electric arc, which supplies energy to a high-rotational gas. This energy, supplied to the plasma, comes from an electronic source with a current control capacity, during the short circuit, and a temperature management of the consumables and the source itself. Therefore, the main objective of this work is to present a plasma cutting source design, capable of operating with a 60 amps output current, which will serve as an object of study in the Laboratory of Energy Converters (LCE) at the Federal University of Ceará. The CC-CC Half-Bridge converter, operating as a current source and controlled by analog voltage and current meshes, was followed by an "OR" logic. The results presented ensure a satisfactory converter study and an adequate dimensioning of the components. Good voltage regulation at nominal power and current adjustment, during the short circuit required for application, are observed.