a compact, high efficiency, and portable wireless ev resonant charger

Efficient and versatile charging solutions are essential for modern applications requiring portable energy systems. this paper presents a novel portable charger powered by an isolated split-core current clamp, enabling direct charging from power lines. the system utilizes inductive coupling to draw ac current from these lines, which is then regulated to a precise voltage for battery replenishment. the proposed design features an interleaved resonant topology with a semi-active rectifier, achieving high efficiency and adaptability to a wide range of input voltages. this architecture supports a variable dc bus voltage, enabling the resonant converter to operate optimally near its resonant frequency for maximum performance. to ensure a lightweight and efficient design, the converter eliminates traditional transformers, incorporating a capacitive element within the resonant network for galvanic isolation. a cascaded dual-control strategy in the interleaved structure ensures precise voltage regulation. designed to be compatible with 1-6 cell li-ion batteries, the charger offers extensive versatility. experimental results from a 2.5-200 w prototype, with an output voltage range of 4.2-25.2 v, demonstrate a peak efficiency of 94%, validating the effectiveness of the proposed charger for grid-connected applications.