Permanent magnets in Apple’s magnetic wireless charger

Since the iPhone 8 in 2017, Apple has added a wireless charging function to all iPhone models, which is similar to other mobile phone wireless charging methods. It starts charging when placed on a wireless charger. This wireless charging relies on the transmitter coil and Accepting the alignment of the coil cannot achieve the best effect when it is placed at hand. If it is placed crookedly, it will cause problems such as reduced wireless charging efficiency, power failure, slow charging, and severe heat generation, which hinders the development of wireless charging and also brings problems. experience.

Starting from the root, Apple launched a new MagSafe magnetic charging technology to solve the bad experience of traditional wireless charging. The iPhone 12 mobile phone, peripheral accessories, and chargers all have MagSafe magnetic components to achieve automatic positioning and alignment.

The permanent magnet in the Apple Magnetic Wireless Charger is a magnetic material used to generate a magnetic field. It is made of metal alloys such as iron, cobalt, and nickel, and has high coercive force, saturation magnetic moment, and magnetic permeability, which can effectively attract and maintain the magnetic patch between the charger and the mobile phone. Make it connected together stably.

Permanent magnet is a term used to make permanent magnet materials, including oxides (such as: ferrite), neodymium iron boron and other metal alloys. These materials are commonly used in the manufacture of electric motors, generators, computer hard drives and other electronic devices.

In the Apple Magnetic Wireless Charger, permanent magnets are used to create a magnetic field that attracts and holds the magnetic patch between the charger and the phone. This design simplifies the charging process, makes it easier to align the charger with the phone, and the charger can be more tightly attached to the phone, making it more stable.

Permanent magnets in Apple's magnetic wireless charger

Permanent magnets in Apple’s magnetic wireless charger

How MagSafe magnetic charging works

As can be seen from the perspective view of the iPhone 12, the MagSafe magnetic charging system component structure, the unique winding coil to withstand greater receiving power, the magnetic flux is captured through the nanocrystalline panel, and the improved shielding layer is used to more safely accept wireless charging. fast charging. A dense array of magnets is integrated around the wireless receiving coil to achieve automatic alignment and adsorption with other magnetic accessories, thereby improving wireless receiving efficiency. Equipped with a high-sensitivity magnetometer, it senses changes in magnetic field strength and responds immediately, enabling iPhone 12 to quickly identify magnetic accessories and prepare for wireless charging.

Compared with the traditional charger, the MagSafe magnetic charger has a big difference in use. The metal shell is flat and round, and it comes with a power supply cable, which is small and light. When the iPhone 12 is placed, the MagSafe magnetic charger bounces up directly due to the strong magnetic force, making a “click”, automatically aligning with the magnetic ring on the phone and firmly adsorbing it, the transmitting coil and receiving coil reach millimeters that cannot be reached by manual placement Level alignment accuracy, so as to achieve high-efficiency high-power charging.

Compared with wired charging, the wireless charging system has the ease of use, but the process of transmitting energy through the air is very dependent on the precise alignment of the transmitting coil and the receiving coil. Apple applies magnetic technology to wireless charging to solve the problem of wireless charging. Difficult to align puzzle. There is no possibility of skewing, so that the wireless charging efficiency can be optimized, and it is also feasible to increase the wireless charging power. The wireless charging power of this generation of iPhone 12 is doubled from 7.5W to 15W, which greatly improves the wireless charging speed and reduces the charging speed. User wait time.

The convenient adsorption of MagSafe magnetic charging can develop more playability. For accessories, magnetic charging also supports Qi wireless charging standard, which means that third-party manufacturers can develop their own 7.5W Qi standard magnetic wireless charger and other Accessories.

Permanent magnets in Qi wireless chargers
Qi transmits electricity based on the principle of electromagnetic induction. The basic principle of the inductively coupled power transfer system is shown on the right. The system consists of a transmitter coil and a receiver coil, which together form an electromagnetically coupled inductor.

The alternating current carried by the transmitter coil generates a magnetic field and induces a voltage in the receiver coil. This voltage can be used to power mobile devices or charge batteries. This type of fixed-position wireless charger uses NdFeB permanent magnets for positioning, so that the terminal device is placed in a fixed position to maximize charging efficiency.

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