Analysis, Design and Implementation of a Charge-Equalization Circuit for use in Automotive Battery Management Systems

Open Access
Brannen, Nicholas James
Graduate Program:
Electrical Engineering
Master of Science
Document Type:
Master Thesis
Date of Defense:
July 17, 2008
Committee Members:
  • Jeffrey Scott Mayer, Thesis Advisor
  • State of Charge
  • EV
  • Charge-Equalization Circuit
  • CEC
  • Battery Management System
  • BMS
  • Electric Vehicle
  • SOC
A charge-equalization circuit for an automotive battery management system has been designed and implemented. The selection of the circuit topology is based on an analysis of several different topologies and criteria for utilizing the battery management system in two Penn State research vehicles. The design process included the selection of appropriate power electronic components, the adaptation of a current-mode controller to facilitate proportional control, and the design of the necessary analog electronics and communication network. Implementation included the fabrication of a printed circuit board, the population of the board, and the testing of the sub-circuits. The system was tested for its ability to transfer prescribed currents. Recommendations for improvements are discussed.