A Phase Shift Full Bridge Converter with Information Integrated for Battery Charger

Bidirectional communication between the battery charger and the Lithium-ion batteries is very important to ensure the safe operation of batteries. There is a trend towards the elimination of communication lines by means of wireless technology. Noticing that the information from the charger to the battery (C2B) is simple logic signals 0 or 1, this paper proposes an idea to integrate the information directly into the power transfer path of the battery charger with phase shift full bridge structure, to save hardware cost. The information is converted to senary data and integrated into the charger through the frequency-shift modulation and the phase-shift modulation. The logical information is then demodulated by the controllers on the battery side. The proposed method achieves the C2B information transmission with no extra hardware cost and little negative effect on the charging process. The effectiveness is verified by experiments.