Learning About Wireless Charging


Picture a world with no tangled charging cables, the ability to charge mobile devices almost anywhere, and wireless kitchen appliances. That probably sounds like something out of a Jetsons cartoon, but it’s a world we’re moving toward at increasing speed. The idea of wireless power is not a new one. Nikola Tesla experimented with wireless power as early as the 1880s1, and Oral-B’s rechargeable toothbrushes have used wireless inductive charging since the early 1990s.2

There’s a lot of science behind wireless charging, also called inductive charging, but I’ll try to explain the basics as simply as I can. If you don’t care how it works, go ahead and skip to the next paragraph. In essence, an electromagnetic field is used to transfer energy between two objects. A charging pad has a transmission coil that converts a regular alternating current into an electromagnetic field. The receiving device has a receiving coil that converts the electromagnetic energy back into electrical current that the device uses to charge its battery. [Read more…]