Performance evaluation of multi-input converter-based battery charging system for electric vehicle applications

Abstract

This chapter address a dual-input half-bridge DC–DC converter with semi-active full-bridge rectifier at secondary. The proposed configuration is satisfactory to provide power supply to load and instantaneously charge the battery. The proposed configuration has three stages. It includes input variable sources; the isolation stage consists of two HFTs (High Frequency Transformer), and the rectifier stage consists of a semi-active full-bridge rectifier at secondary with a bidirectional buck boost converter for charging and discharging the battery. Complete steady-state analysis and design of the converter have been investigated. An FPGA-based controller was used to implement digital closed loop control in order to minimize the control strategy's complexity. A constant current/constant voltage (CC/CV) mode of control algorithm has been implemented for charging the battery in order to achieve higher efficiency and protection of the battery. The battery charging current is controlled by the output current control loop and has low output voltage ripple, which leads to high efficiency of the system. To confirm the feasibility of the proposed system, an experimental prototype has been developed. Extensive tests have been carried out under varying loads and different input voltage variations. Compared with standard systems, the proposed system has an improved capacity to utilize different sources of power. © 2023 selection and editorial matter, Dharavath Kishan, Ramani Kannan, B Dastagiri Reddy and Prajof Prabhakaran; individual chapters, the contributors.