![]() There are charging pads that use tightly-coupled electromagnetic inductive or non-radiative charging charging bowls or through-surface type chargers that use loosely-coupled or radiative electromagnetic resonant charging that can transmit a charge a few centimeters and uncoupled radio frequency (RF) wireless charging that allows a trickle charging capability at distances of many feet.īoth tightly coupled inductive and loosely-coupled resonant charging operate on the same principle of physics: a time-varying magnetic field induces a current in a closed loop of wire. How wireless charging worksīroadly speaking, there are three types of wireless charging, according to David Green, a research manager with IHS Markit. That's the type of charging Apple has incorporated into the iPhone 8 and the iPhone X. The most popular wireless technologies now in use rely on an electromagnetic field between a two copper coils, which greatly limits the distance between a device and a charging pad. The wireless charging circuit board used for Ossia's Cota RF technology, which can send power over distances greater than 15 feet. Wireless charging is making inroads in the healthcare, automotive and manufacturing industries because it offers the promise of increased mobility and advances that could allow tiny internet of things (IoT) devices to get power many feet away from a charger. ![]() Today, there are nearly a half dozen wireless charging technologies in use, all aimed at cutting cables to everything from smartphones and laptops to kitchen appliances and cars. Wireless charging has been around since the late 19th century, when electricity pioneer Nikola Tesla demonstrated magnetic resonant coupling – the ability to transmit electricity through the air by creating a magnetic field between two circuits, a transmitter and a receiver.īut for about 100 years it was a technology without many practical applications, except, perhaps, for a few electric toothbrush models. ![]()
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