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Wireless Charging Hardware Stack Shielding

Shielding protects electronic components against undesirable magnetic and electric fields. If wireless charging technology is employed, there is a desired magnetic field, however, other fields must be kept away from sensitive components. Today you can even purchase wireless charger hidden for more convenience.

The most well-known shields used in phones are the copper-graphite and the Nanocrystalline Ferrite protection. The purpose that the graphite screen performs is to spread out the heat generated by the charging device over an entire surface. Likewise, the ferrite shield aims to enhance the magnetic field connected to the charging coil and to keep the magnetic field at a minimum penetration to the phone's body.

It is the Qi standards document suggests soft ferrite shielding, and suggests the precise location and the thickness. Ferrite materials have shielding abilities similar to other metals with great permeability, but they are less susceptible to magnetic noise caused by thermal Johnson drafts due to their resistance electrical.

It is vital to note that even though the Qi documentation includes more than 40 different compositions for power transmitters. There are solely five options for receivers that represent the wattage range of 5W to 15W.

The Qi standard prohibits permanent magnets from being used in active devices. In reality, it has taken out some traditional transmitter coils that utilized permanent magnets. The purpose of these magnets was to ensure that the device was always in alignment with the charger by the magnet's force of attraction.