The basic principle of wireless charging

- Jan 15, 2018 -

The basic principle of wireless charging


Electromagnetic induction

The primary coil has a certain frequency of alternating current, which generates a certain current through the electromagnetic induction in the secondary coil, thus transferring the energy from the transmission to the receiving end. At present, the most common charging solution on the use of electromagnetic induction, in fact, the electromagnetic induction solution on the technology is not too much mystery, Chinese local Byd Co, as early as December 2005 for the Contactless charger patent on the use of electromagnetic induction technology.


Magnetic resonance

The energy transmission device, composition and energy receiving device, when the two devices are adjusted to the same frequency, or resonance at a particular frequency, they can exchange energy, is a kind of technology that is currently being investigated by the Massachusetts Institute of Technology (MIT) research team led by Soljacic Marin, Professor of physics by the technology lit two meters outside a 60 watt light bulb, and named WiTricity. The diameter of the coil in this experiment is up to 50cm, and it can not be commercialized. If the coil size is reduced, the receiving power will naturally decline.


Radio wave type

This is a mature technology, similar to the early use of the ore are mainly radio, microwave transmitting device and microwave receiving device, can capture the radio wave energy back from the walls, to maintain a stable DC voltage at the same time with the load to make adjustments. This method requires only one transmitter mounted on a wall plug, and a "mosquito type" receiver that can be installed at any low voltage product.


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