Adaptive CLC-S tuned DWPT system with overlapping coil magnetic coupler for output power fluctuation mitigation

In dynamic wireless power transfer (DWPT) systems employing transmitting (Tx) coil arrays, output power fluctuations aggravate battery charging current ripples and compromise system stability. To address this issue, this work proposes a CLC-S compensation topology based on a dual-input single-output (DISO) architecture along with a cooperative coil design methodology. Theoretical analysis of the DISO CLC-S compensation network reveals that equivalent mutual inductance fluctuation is the main cause of output power instability, and that cross-coupling between Tx coils can disrupt the zero-voltage-switching (ZVS) condition. Parameter sensitivity analysis identifies the Tx coil series compensation capacitance as the key tunable parameter decoupled from the system output power. Based on the ZVS boundary condition, a tuning strategy is proposed to suppress the cross-coupling effect. To minimize equivalent mutual inductance fluctuations, an analytical model for the mutual inductance between the receiving (Rx) coil and adjacent dual transmit (Tx) coils under lateral movement is proposed. The model enables the determination of the optimal center-to-center distance between Tx coils, and supports the design of an overlapping Tx coil layout. A 1.3 kW prototype is developed for validation. Test results demonstrate that, compared to a single-input single-output (SISO) system, the proposed solution reduces output power fluctuation by 85.87%, while full ZVS operation during dynamic charging is achieved. In this case, the average output power has been increased by 6.58%.