STUDY OF NON-ISOLATED HALF-BRIDGE DC-DC CONVERTER FOR LIGHT WEIGHTED EV CHARGING APPLICATIONS

Abstract

The paper discusses the modeling, designing, and controlling processes of the non-isolated half-bridge DC-DC converter utilized in light-weight electric vehicle (EV) charging. The suggested converter facilitates effective conversion of electrical energy from a DC source to an EV battery and vice versa. Dynamic models are developed in order to represent and study the dynamics of the converter depending on the load and operational parameters. In order to provide secure and stable bat tery charging process, constant current/constant voltage (CC-CV) battery charging algorithm is designed. In CC state, the current of the battery is controlled by the charger controller whereas in the second case, when the battery voltage approaches its rated value, the controller shifts to CV state to charge the battery up to its maximum level. As a result, less pressure is put on the battery and higher efficiency of the charger is attained. It is found that due to the features and advantages of the half-bridge topology, the converter is quite efficient, has low current ripples, and rapid dynamics. Consequently, the suggested converter with CC-CV algorithm proves to be a cost-effective and highly efficient technology of future EVs charging.