Visual charging, smart charging, and wireless charging will be the three main types of battery charging in the future.Qi specifies three different methods for coil calibration, namely: guided positioning (magnetic attraction), free positioning (moving coil), and free positioning (Coil array). Let's briefly explain the three methods below.
Guide positioning (magnetic attraction)
It is a one-to-one fixed position charging is used to guide the placed charging equipment and achieve accurate calibration. The advantage of this calibration method is simple, but It requires a series of materials attracted by magnets in charging equipment. Therefore, the power loss associated with the eddy current (and thus the temperature rise) will be attracted by the magnetic attractor.
Free positioning (movable primary coil)
It is also a one-to-one charging device that can be positioned and charged. This method requires a mechanically movable primary coil that is tuned to couple with the position of the charging device. However, movable mechanical parts often reduce the reliability of the system. In addition, for multiple charging devices, the motor control of the primary coil is complex and expensive.
Free positioning (coil array)
It lets you charge several gadgets without having to worry about their position. Compared with the above two methods, this calibration method is based on a more expensive and more complex winding structure and control electronic elements. But it provides us with more user-friendliness.
