An ENS-Based Three-Channel Receiver for Null-Free Power Pickup in Multipolar UAV-IPT Systems

This study addresses the critical challenge of coupling nulls in multipolar inductive wireless power transfer (IPT) systems for unmanned aerial vehicles (UAVs). A novel receiver architecture is proposed, integrating an orthogonal three-channel coil structure with a two-stage Euclidean Norm Synthesizer (ENS). In contrast to conventional methods, the proposed system captures the three-dimensional magnetic field vector and synthesizes its Euclidean norm to achieve spatially continuous power pickup. Experimental results demonstrate that the proposed design effectively eliminates the coupling nulls inherent in conventional dual-channel receivers. Furthermore, compared to the three-channel linear summation topology, the proposed ENS-based design significantly suppresses output voltage ripple by approximately 28.09% (reducing it from 48.55% to 20.46%). Moreover, the proposed system maintains a high mean transfer efficiency of 90.92%, yielding a robust, null-free, and low-ripple power supply suitable for reliable autonomous UAV charging.