Wireless EV Charging Coil Assembly With Stray Field Shielding

The patent applies parameter changes by optimizing the resonant frequency of both the vehicle-mounted and ground-mounted coil assemblies to match, enabling resonant inductive coupling. This resonance condition significantly enhances power transfer efficiency and charging speed compared to conventional inductive charging, while maintaining wireless convenience. The system dynamically adjusts operating parameters to maintain optimal resonance during charging.

The patent optimizes power transfer efficiency by tuning the resonant frequencies of transmitter and receiver coil assemblies to match, creating a resonant coupling condition. This resonance dramatically reduces energy loss and improves coupling efficiency. Additionally, the system employs impedance matching networks and dynamically adjusts operating parameters to maximize power transfer efficiency across varying charging conditions.

The patent converts the potentially harmful stray electromagnetic fields into beneficial effects by using shielding coils that generate opposing magnetic fields. These shielding coils, positioned around the charge coil assembly, create counteracting magnetic flux that cancels out stray fields. The system transforms the electromagnetic interference problem into a controlled field cancellation solution, enabling high-power charging with reduced environmental impact.

The patent merges the shielding function with the structural support and positioning components of the coil assembly. The shielding coils are integrated into the same housing and mounting structure as the charge coils, sharing common support elements and control circuitry. This integration approach reduces overall device complexity while maintaining effective stray field cancellation, as the shielding and charge functions work in unison rather than as separate subsystems.