Multi-Coil Wireless Charger Alignment Control for Efficient Power Transfer

The patent divides the single transmission coil into multiple segmented coils arranged in an array. Each coil can be independently controlled and driven. This segmentation allows the system to select or combine specific coils based on the receiving coil's position and alignment, thereby maintaining high charging efficiency across various placement scenarios while keeping each individual coil relatively simple in structure.

The patent implements dynamic coil selection and control where the management device determines the receiving coil's position and alignment in real-time, then dynamically selects which transmission coil(s) to drive based on proportional alignment values. This dynamic adaptation allows the system to optimize charging efficiency for each specific scenario rather than relying on fixed static coil configuration.

The patent designs the transmission coil array and management device to perform multiple functions: position detection, alignment calculation, coil selection, and power control. The management device serves as a universal controller that handles all these tasks, allowing the physical coil structure to remain relatively simple while achieving high adaptability through intelligent control software.

The system performs self-positioning and self-optimization by automatically detecting the receiving coil's position, calculating alignment values, and selecting the appropriate transmission coil without user intervention. The management device autonomously manages the entire process, reducing the need for complex manual configuration or adjustment mechanisms.

The patent implements partial detection where the management device determines which transmission coil(s) are most likely to be aligned with the receiving coil based on initial position information, then transmits detection pulses only to those specific coil(s) rather than all coils. This partial action approach maintains reliable detection by focusing on the most probable candidates while significantly reducing overall power consumption.

The system uses the receiving coil's own response to detection pulses to automatically confirm its presence and position. When a detection pulse is transmitted, the receiving coil's response serves as self-identification and position confirmation, eliminating the need for additional active sensing mechanisms or continuous power consumption for monitoring all coils.

The patent divides the foreign object detection process into segmented steps corresponding to each transmission coil. The management device performs FOD detection at each coil position sequentially or selectively based on which coils are actively engaged in charging. This segmentation allows comprehensive safety checking at relevant locations without requiring simultaneous detection at all possible positions, thereby reducing total detection time while maintaining safety.

The system performs preliminary foreign object detection before initiating full charging operation. By detecting foreign objects at each coil position in advance and establishing FOD timeouts, the system ensures safety is verified before committing to extended charging sessions, preventing harmful effects while minimizing the time spent on detection through upfront verification.