How wireless charging works

Electromagnetic induction

The primary coil has a certain frequency of alternating current and generates a certain current in the secondary coil through electromagnetic induction, thereby transferring energy from the transmission end to the receiving end. At present, the most common charging solution adopts electromagnetic induction. In fact, electromagnetic induction solutions do not have much mystery in the realization of technology. The Chinese local BYD Company applied for non-contact inductive charging as early as December 2005. The device patent uses electromagnetic induction technology.

Magnetic resonance

By the energy sending device, and the energy receiving device, when the two devices are tuned to the same frequency, or resonate at a specific frequency, they can exchange energy between each other. It is a technology that is currently being researched and developed by Massachusetts. A team led by the Institute of Physics (MIT) physics professor Marin Soljacic used the technology to light up a 60-watt light bulb two meters away and named it WiTricity. The diameter of the coil used in this experiment reached 50 cm, and it could not be commercialized yet. If the coil size is to be reduced, the received power naturally decreases.

Radio wave type

This is a more mature technology, similar to the early use of ore radios. It consists mainly of a microwave emitting device and a microwave receiving device. It can capture the radio wave energy rebounding from the wall, and adjusts along with the load while maintaining a stable direct current. Voltage. This method requires only a transmitter mounted on a wall plug and a "mosquito" receiver that can be mounted on any low voltage product.