Wireless power transfer pulse charging of lithium-ion battery

Abstract

In Wireless Power Transfer (WPT), the constant current-constant voltage (CC-CV) technique has been considered a standard strategy for charging lithium-ion (Li-ion) batteries. The pulse charging profile is used in this work in the Inductive Power Transfer (IPT) because of the inherent advantages of the pulse charging approach over the Constant Current-Constant Voltage method, such as improving the IPT-based charger efficiency. The LCC-Series compensation topology was chosen because it can meet the requirement of minimizing output characteristics' reliance on variations in Li-ion battery parameters. The pulse charging of the Li-ion battery on the second side is accomplished through phase-shifted control of the primary side high-frequency inverter. The control loops for pulse charging must be developed using the IPT transfer functions, according to the implementation technique. As a result, comprehensive modeling of the LCC-Series topology is presented, and the generated small-signal model is validated. Based on the confirmed model, the current and voltage loop control is constructed. The challenges associated with the pulse charging technique in the IPT system are explored, and a software-based solution to the problems highlighted is provided. The simulation and experimental results verified the validity of the conducted theatrical discussions.