Modeling of a Buck-Boost Converter With High Transformation Range for EV

Many applications require the transformation of energy by applying DC/DC converters with wide gain ranges and capacities to provide high current or voltage levels. Low voltage applications have been standardized to 48/24/12/5 V for various Electric Vehicle applications such as lighting, GPS, audio and air conditioning. However, for fast charging of electric vehicles, high voltage levels standardized to 380 V are required. This paper presents the design and modeling of a Buck-Boost converter based on the concept of reduced redundant power processing with high voltage transformation ratio. The operation of the converter in continuous conduction mode is presented. The average and linear models are developed, and the dynamics of poles and zeros in the variables to be controlled are presented. In addition, a comparison with converters reported in the literature is presented.