The key difference lies in the fundamental technology and the distance of power transfer. The wireless charging used for a smartphone or an electric toothbrush is a near-field technology called resonant inductive coupling. It relies on creating a magnetic field between two coils that are very close to each other, with power transfer distance typically measured in centimeters. This method is highly efficient but its power rapidly diminishes over distance.

Long-range wireless electricity transmission for applications like the power grid is a far-field technology. It uses focused beams of microwaves or lasers to transmit energy over much greater distances, often hundreds of meters or even kilometers. While this technology eliminates the need for physical wires, it is currently plagued by the efficiency and safety issues mentioned in the previous question.

At Ningbo Changshi, we recognize the importance of both technologies but maintain a strong focus on the proven wired infrastructure. Our overhead line equipment and underground cable laying equipment are meticulously engineered to maximize the efficiency and longevity of these essential power delivery systems.