Analysis, Design, and Experimental Validation of a Primary Side Current-Sensing Flyback Converter for Use in a Battery Management System

Abstract

Abstract:The purpose of the presented flyback converter is to equalise the voltage between the cells in a series string within a battery pack providing an active cell-balancing system. This would be an important part of a battery management system (BMS) for charging li-ion batteries in electric vehicles. The converter is based on primary side current sensing, where the conventional feedback circuit is omitted. The purpose of this converter is to improve efficiency by decreasing losses and to increase battery power density by decreasing the number of elements which constitute the power electronics; these are important factors for the future development of electric vehicle battery packs. Analysis of the circuit and the design procedure of the DC-DC flyback converter with primary current sensing is presented in this paper. Finally, several experimental converters have been built and tested to validate the authors' approach.

DC-to-DC Converter Topologies for Wireless Power Transfer in Electric Vehicles

“…These resonant compensation circuits are shown and detailed in [23,24]. Non-isolated and isolated versions of Ćuk and SEPIC converter have been used in the literature [25][26][27][28][29][30]. Magnetically coupled single-switch buck-boost converters (namely isolated Ćuk, Zeta, SEPIC, and P5) have been presented in [1].…”

Three-Output Flyback Converter with Synchronous Rectification for Improving Cross-Regulation and Efficiency

“…A flyback converter [1][2][3][4] is a common choice for low to medium power supply design. The advantage of a flyback converter includes galvanic isolation, wide output voltage range, its simple structure, less peripheral devices and its cost effectiveness, etc.…”

Design and Experimental Verification of Voltage Measurement Circuits Based on Linear Optocouplers with Galvanic Isolation for Battery Management Systems

“…From analysed circuits, it can be concluded that the suggested galvanic isolation would benefit from the application of the conventional battery equalization methods, thus an alternative solution is to be found. Although the battery cell equalization technologies are not an object of this research, the converter presented in [22] has been used in the current study. The described flyback converter with primary current sensing can be applied for a battery pack with galvanically isolated cells from its BMS.…”