A Novel High-Power, Wide-Range PT-Symmetric Wireless Power Transfer Systems With Reconfiguration-Free Arbitrary Current Ratio Adjustment

Parity-Time (PT) symmetric mechanism has attracted extensive interest for their excellent positional robustness, but are strictly limited by the fixed current amplitude ratio determined by the inductance ratio, which greatly restricts power transfer performance. To overcome this issue, a novel PT symmetric mechanism based on a specially designed S-0 topology is proposed. Theoretical derivations of the mechanism and parameter criteria are verified experimentally. The results show that: 1) α is no longer limited by the inductance ratio L1/L2 and can be arbitrarily adjusted without hardware changes; 2) kc is independent of RL and positively correlated with α. Reducing α increases both output power and transfer distance. Moreover, kc can be used as a design parameter to determine α, ensuring high positional robustness under all conditions; 3) When conventional PT-symmetric operation fails—large primary inductance and small secondary inductance—the proposed mechanism ensures stable operation while better balancing power, efficiency, and distance.