Realizing Constant Current and Constant Voltage Outputs and Input Zero Phase Angle of Wireless Power Transfer Systems With Minimum Component Counts

In both normal and fast wireless electric vehicle charging systems, constant current/constant voltage (CC/CV) profile, regardless of the variation battery state charge, is one most essential characteristics to ensure performance reliability. The input zero phase angle (ZPA) able minimize system volt-ampere rating, enhance power transfer capability, make it easy achieve soft-switching operation over full range profile. Therefore, load-independent CC CV output with ZPA conditions are necessary for systems. However, existing methods that can these functions either add switches or need a large number compensation components, which inefficient, uneconomical, bulky. this paper, unified resonant tuning configuration minimum passive component counts proposed outputs at two operating frequencies. According configuration, all possible inductive (IPT) capacitive (CPT) topologies analogized. With topologies, achieved using components no additional switches. Among simplest IPT primary Series-secondary Series Parallel (S-SP) topology illustrated demonstrate analysis.