Why is there a magnetic sheet under the wireless charging coil?

Release time:

2023-12-25 11:02

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The field of wireless charger industry is booming. Wireless charging technology has been applied to more and more industry fields. The wireless charger products in the market are dazzling and the quality is uneven. The wireless charging coil plays a vital role in the quality of the wireless charger.
Everyone knows that in wireless charger products, an indispensable accessory is the magnetic sheet. The processing and assembly of the magnetic sheet is extremely important. It directly affects the performance and user experience of the overall wireless charger product. Naturally, as consumers, they may pay relatively little attention. This is an indispensable factor when purchasing wireless charger products. Today, let us learn about the role of the partition.

1. Magnetic permeability
As we all know, the working principle of the QI wireless charger standard is electromagnetic induction. When the primary coil (wireless charger transmitter) works, it will generate a magnetic field with changing strength. In order to convert the energy of the magnetic field into electrical energy as much as possible at the receiving end, it is necessary to correctly guide the magnetism of the primary coil.
After the magnetic sheet is added to the receiving end, the magnetic field is obviously closed to the middle, while the magnetic field is more scattered without the magnetic sheet guide. The magnetic sheet plays a magnetic permeability role at the receiving end, providing a magnetic field line loop for the magnetic field at the transmitting end, and gathering the magnetic field to improve the conversion rate of the receiving end.
2. Magnetic blocking
In addition to magnetic permeability, the magnetic sheet is also required to play a role in the file. As we all know, closed conductor in the change of magnetic field will produce current, according to I = BS, the change of magnetic field leads to the change of magnetic flux, if it is a whole piece of metal, will produce eddy current effect.
Eddy current will generate a lot of heat, and the principle of induction cooker, the use of eddy current effect to convert electrical energy into heat energy. But in electronic products, we should try to avoid heat. Because heating not only loses too much electric energy, high temperature will cause damage to electronic products. In order to prevent heating, it is necessary to restrict the magnetic field, so that the magnetic field only acts on the receiving end coil as far as possible, but has no effect on other components.
3. Heat dissipation
The magnetic field acts on the coil, and the high-frequency current is generated in the coil. In this process, the coil itself will also bring heat. This heat must be dissipated as soon as possible, otherwise it will damage the electronic products. Sometimes when we use the wireless charger, the heat is very severe. Usually caused by coils or circuit boards.
In order to more effectively conduct the heating of the coil and the heating of the circuit board, the coil, the magnetic sheet, and the circuit board are integrally packaged through low temperature and low voltage, which can achieve a better heat dissipation effect.

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Thanks to the joint efforts of the company, we have upgraded and registered from penghao electronics factory to dongguan penghao electronics co., ltd. thank all friends for their strong support to penghao. dongguan shijie penghao electronics factory has gone through several years and has been upgraded from dongguan shijie penghao electronics factory to dongguan penghao electronics co., ltd. since March 2015. I am glad that we still serve everyone with penghao!

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Thanks to the guidance of SANYO leaders, we continue to work hard, improve and better serve our customers. On March 07, 2012, Peng Hao joined SANYO's supplier system and officially held hands with SANYO successfully. Through six months of planning, examination and sample preparation, the voice coil produced by Penghao has been affirmed by SANYO, and Penghao's products have followed the SANYO brand to people's lives.