What are the forms of wireless charging

At present, there are three main forms of wireless charging as follows.

1. Electromagnetic induction wireless charging

2. Magnetic resonance wireless charging

3. Radio wave wireless charging

Wireless charging principle - electromagnetic induction wireless charging

Electromagnetic induction wireless charging is the most applied wireless charging solution, which is mentioned in the high school physics textbook by the primary coil of a certain frequency of alternating current, and then use electromagnetic induction to generate a certain current in the secondary coil, so as to transfer energy from the transmission side to the receiving side. Currently the most common charging mat solution uses electromagnetic induction, in fact, there is not much mystery in the technical implementation of the electromagnetic induction solution.

Wireless charging principle - magnetic field resonance wireless charging

Magnetic field resonant wireless charging consists of an energy sending device, and an energy receiving device, when the two devices are adjusted to the same frequency, or rather resonate at a specific frequency, they can exchange energy with each other, is a technology currently under research. A research team led by Marin Soljacic, a physics professor at the Massachusetts Institute of Technology (MIT), used the technology to light up a 60-watt light bulb two meters away and named it WiTricity. the coil used in the experiment reached a diameter of 50cm, which is not yet commercially available, and if the coil size is to be reduced, the receiving power will naturally drop.

The principle of wireless charging is through near-field induction, the wireless charging device will conduct energy to the charging terminal device, and the terminal device will then convert the received energy into electrical energy stored in the device's battery. The principle of energy conduction is inductive coupling, which can ensure that there is no exposed conductive interface, which not only can eliminate the messy transmission lines between devices, but also is safer for electronic devices such as electric toothbrushes that are often in contact with conductive media such as liquids.

What are the forms of wireless charging

At present, wireless charging mainly has the following three forms.

1. Electromagnetic induction wireless charging

2. Magnetic resonance wireless charging

3. Radio wave wireless charging

Wireless charging principle - electromagnetic induction wireless charging

Electromagnetic induction wireless charging is the most applied wireless charging solution, which is mentioned in the high school physics textbook by the primary coil of a certain frequency of alternating current, and then use electromagnetic induction to generate a certain current in the secondary coil, so as to transfer energy from the transmission side to the receiving side. At present, the most common charging mat solution uses electromagnetic induction. In fact, there is not much mystery in the technical implementation of electromagnetic induction solutions, and the local Chinese company BYD, which applied for the patent of non-contact induction charger as early as December 2005, uses electromagnetic induction technology.

Wireless charging principle - magnetic field resonance type wireless charging

Magnetic field resonance wireless charging consists of an energy sending device, and an energy receiving device. When the two devices are adjusted to the same frequency, or resonate at a specific frequency, they can exchange energy with each other, and is a technology currently under research. A research team led by Marin Soljacic, a physics professor at the Massachusetts Institute of Technology (MIT), used the technology to light up a 60-watt light bulb two meters away and named it WiTricity. the coil used in the experiment reached a diameter of 50cm, which is not yet commercially available, and if the coil size is to be reduced, the received power will naturally drop.

Wireless charging principle - radio wave type wireless charging

This is the development of more mature technology, similar to the early use of ore radio, mainly microwave transmitter and microwave receiver device, can capture the radio wave energy bounced back from the wall, in line with the load to make adjustments while maintaining a stable DC 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.