Cylindrical Wireless Charging Coil for Smartwatch Efficiency

The single-loop transmission coil is segmented into multiple independent coil loops (first coil loop, second coil loop, third coil loop, fourth coil loop) arranged in a specific configuration. Each loop generates magnetic fields in specific directions, and by combining multiple loops, the patent eliminates reverse direction magnetic fields while maintaining structural simplicity. The segmented coil structure allows selective orientation of magnetic fields to prevent circuit malfunction.

The patent transitions from a planar coil arrangement to a three-dimensional coil configuration with multiple loops extended in different spatial dimensions. The first and second coil loops are arranged in one dimension while the third and fourth coil loops are arranged in another dimension, creating a multi-dimensional magnetic field distribution. This dimensional expansion increases the effective charging area and improves charging efficiency without compromising waterproof performance.

The patent adopts a curved cylindrical arrangement for the coil loops instead of a flat planar configuration. The first, second, third, and fourth coil loops are arranged in a curved three-dimensional pattern that follows a cylindrical geometry. This curved configuration provides extended charging coverage and freedom while maintaining a compact form factor that preserves the mechanical appearance and aesthetic design of smart watches.