Conversor DAB ressonante como opção para carregadores on-board de veículos elétricos

Abstract

The environmental need in the use of renewable energy sources, just as the reduction in greenhouse gas emissions put electric vehicles as the great solution in the transportation market for the coming years. Parallel to the advent of these vehicles arises the need for a better use of energy in the converters used. Therefore, this work proposes the development of an isolated converter for the application in more efficient, smaller and lighter chargers. The proposed topology presents high efficiency when switching at the resonance point and excludes the need for a control system when operating at constant voltage gain. The converter design methodology for a 3300 W application is presented. A technique is proposed to track the resonance and ensure operation with maximum efficiency of the topology. Computer simulations and prototype tests are performed in order to prove the effectiveness of design and proposed technique. The results obtained were satisfactory, reaching efficiency above 98 % for operation at nominal load. In addition, the consumption of computational resources required to perform the real-time tracking is analyzed.