Wireless charging technology allows devices to be charged without the need for physical cables, providing convenience and a clutter - free charging experience. The most common wireless charging principle is based on electromagnetic induction.

In an electromagnetic induction - based wireless charging system, there are two main components: the charging pad (transmitter) and the device (receiver). The charging pad contains a coil that is connected to an alternating - current (AC) power source. When an AC current flows through the coil, it generates an alternating magnetic field. The receiver in the device also has a coil. When this receiver coil is placed within the magnetic field of the transmitter coil, electromagnetic induction occurs, inducing an electromotive force (EMF) in the receiver coil. This induced EMF generates an electric current, which is then used to charge the battery in the device.

To improve the efficiency of wireless charging, resonance - based wireless charging technology has been developed. Resonant wireless charging uses the principle of electromagnetic resonance. Both the transmitter and receiver coils are designed to resonate at the same frequency. When the frequencies match, energy transfer between the coils becomes more efficient, allowing for a greater distance between the charging pad and the device while maintaining a relatively high charging efficiency.

Another emerging wireless charging technology is radio - frequency (RF) wireless charging. RF - based systems transmit energy in the form of radio waves. The transmitter emits radio waves, which are then captured by the receiver in the device. The receiver converts the captured radio - frequency energy into electrical energy to charge the battery. RF wireless charging has the potential to enable charging over longer distances and multiple devices simultaneously, although its efficiency is currently lower compared to electromagnetic induction and resonance - based methods.

Read recommendations:

36W desk Switching power supply

72-200W Switching Power Supply

12V European standard battery charger

8.4V Li - ion battery charger

Analysis of Output Voltage and Current of Power Adapter