Guide: Why do wireless charging coils need to add magnetic spacers, roughly summarize the following three aspects:
1. Magnetic permeability
As we all know, the principle of the QI wireless charging standard for magnetic barriers is electromagnetic induction. When the primary coil (wireless charging transmitter) is working, it will generate an interactive magnetic field (the direction of strength is constantly changing). In order to make the magnetic field energy emitted by the primary coil act on the secondary coil (wireless charging receiver) as much as possible, it is necessary to The magnetism of the coil is guided.
2. Magnetic block
The magnetic sheet should not only be able to effectively conduct magnetism, but also play a role in blocking magnetism. Why block the magnetism? We know that when a changing magnetic field encounters a conductor such as a metal, if the metal is a closed wire, it will generate current, if the metal is a closed wire, especially a whole piece of metal, an eddy current effect will occur.
3. Heat dissipation
The magnetic field acts on the inductor coil to generate high-frequency current. During this process, the coil itself will also generate heat. If this heat is not effectively dissipated, it will accumulate. Sometimes we feel very hot during wireless charging. Generally, it is caused by the heating of the inductance coil or the heating of the circuit board.
Post time: Apr-15-2021
