Foldable magnetic flux transformation for wide-area, misalignment-tolerant and interoperable wireless charging

In wireless power transmission, the magnetic flux cancellation caused by misalignment is the main reason for the rapid decrease, zero-crossing, and reversal of the coupling between the transmitter and receiver coils, which severely limits the effective charging area. Traditional solutions based on either compensation networks or control methods cannot break free from the constraint of low coupling. Here, we propose a foldable flux transformation technology and explain its working principle to address this issue. The receiver can adaptively and dynamically switch the direction of its own magnetic flux based on the magnetic flux of the transmitter it receives, thereby keeping the system in a state of maximum coupling. This technology breaks through the limit of misalignment tolerance, increasing the charging area by more than 100%. Furthermore, this technology enhances the interoperability of wireless power transmission systems, enabling compatibility with various mainstream coil structures.