The wireless charging function in linear adapters represents a significant advancement in power delivery, eliminating the need for physical cables between the adapter and the device being charged. This functionality is based on the principle of electromagnetic induction, although more advanced techniques such as resonant inductive coupling are also commonly used.

In the case of electromagnetic induction, the linear adapter with wireless charging capabilities contains a primary coil. When an alternating current is passed through this primary coil, it generates a changing magnetic field. The device to be charged, which is equipped with a secondary coil, is placed on the charging pad of the adapter. The changing magnetic field from the primary coil induces an electric current in the secondary coil of the device. This induced current is then rectified and regulated to charge the battery of the device.

Resonant inductive coupling takes this concept further. It involves tuning both the primary and secondary coils to resonate at the same frequency. This resonance significantly increases the efficiency of power transfer over a greater distance compared to simple electromagnetic induction. As a result, the device does not need to be in perfect physical contact with the charging surface; it can be within a small range, providing more flexibility in positioning.

Linear adapters with wireless charging also incorporate control circuits to manage the power transfer process. These circuits monitor the charging status of the device, adjusting the power output of the adapter accordingly. For instance, when the device's battery is almost full, the adapter reduces the power transfer rate to prevent over - charging.

Another important aspect is the compatibility of the wireless charging function. To ensure that a wide variety of devices can be charged, linear adapters often adhere to industry - standard wireless charging protocols such as Qi. The Qi standard defines the technical specifications for wireless charging, including coil design, power levels, and communication protocols between the charger and the device. This standardization allows smartphones, smartwatches, wireless earbuds, and other Qi - compliant devices to be charged on the same linear adapter wireless charging pad. Additionally, many modern linear adapters with wireless charging also feature 异物 detection systems. These systems can detect if any metallic or non - charging objects are placed on the charging pad and will either stop the charging process or alert the user to remove the object, enhancing the safety and reliability of the wireless charging function.

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