A Full Bridge Series-Series Resonant IPT System Optimized for Charging Electric Vehicle Batteries Across an Extensive Range

Designing an effective inductive charging system for electric vehicles, with distinct battery pack voltages ranging from 200 V to 800 V, poses considerable challenges. Conventionally, addressing this broad battery range involves using a secondary-side DC-DC converter with diode bridge rectifiers or controlled rectifiers, but this approach increases onboard vehicle weight and introduces complex control issues, leading to reduced system efficiency. This article proposes an innovative solution in the form of a wide-gain converter with two sets of coupled coils designed to efficiently charge batteries across different voltage ranges. The proposed system operates in four modes: voltage doubler (V-D), current doubler (I-D), full-bridge (F-B), and half-bridge (H-B) the system. The proposed system is simulated in MATLAB simulations, and the simulated performances are validated using a laboratory prototype at different output voltage and power levels. Additionally, the laboratory prototype with SiC devices has been constructed. The efficiency analysis at various loading conditions has been evaluated.