A Novel IPT System With Full-Range Soft-Switching Operation and Magnetic Integration Based on Dual-Decoupling Concept for Efficiency and Power Density Optimization

To meet the urgent demand for high efficiency and high power density inductive power transfer (IPT) system in key applications such as electric vehicles, deep-sea intelligent equipment and consumer electronics, this article proposes a novel IPT system with full range soft-switching operation and magnetic integrated structure based on the dual-decoupling concept. With the help of the novel active auxiliary network, the switching tubes in the high-frequency inverter can achieve zero-voltage switching (ZVS)-ON and ZVS-OFF within the full power range. Meanwhile, the proposed magnetic integrated structure based on the dual-decoupling concept integrates the resonant inductor in the auxiliary circuit and compensation network into the transmitter coil, sharing a set of magnetic core. It can achieve the decoupling between the auxiliary resonant inductor and the compensation resonant inductor, as well as the decoupling between the two resonant inductors and the power transfer coils, with the effect of suppressing leakage flux and reducing the proximity effect of high-frequency currents. The proposed dual-decoupling concept can be extended to other high-order compensation IPT topologies with multiple resonant inductors. The above schemes can effectively reduce the system's switching losses and the overall core losses of the system, improve the transfer efficiency of the system across the entire power range, and possess many advantages such as high power density, efficiency, and magnetic flux balance. Eventually, the advantages of the proposed scheme are validated through the construction of a 1kW experimental prototype.