Wireless charging has been around since the late 19th century when electricity 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.
wireless charging works on electromagnetic induction.
a magnetic loop(copper coil) is used to create an oscillating magnetic field, which can create a current in one or more receivers’ antennas.
if the appropriate capacitance is added so that the loops resonate at the same frequency, the amount of induced current
in receivers increases.
Companies Working on Wireless charging Technology:-
For several years, there were three competing wireless charging standards groups focused on
inductive and resonance charging specifications: The Alliance for Wireless Power (A4WP), the Power Matters Alliance (PMA), and the Wireless Power Consortium (WPC).
The latter’s 296-member roster includes Apple, Google,
Verizon and a veritable who’s who of electronics manufacturers.
Till What Distance wireless charging works:-
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.
types of wireless chargings:
1.charging pads that use tightly-coupled electromagnetic inductive or no-radiative charging very less gap in between two devices that makes use strong coupling and very less amount of energy loss.
2.charging bowls or through surface type charger that uses loosely-coupled- or radio radiative electromagnetic
resonant charging that can transmit a charge a few centimeters and uncoupled radiofrequency.
Wireless charging in smartphones:-
Firstly wireless charging used by Huawei in mate 20pro back in 2018 and followed by the Samsung S10 series in 2019.
And following this many smartphone brands used this technology in their smartphones like Oppo, Oneplus, Apple, Realme, etc.
These brands not only used this technology but also evolved it like
1.Oppo has made its Sper Vooc charger of 60W.
2.Lenovo legion gaming phone at 90W in which we can charge our phone in half an hour.
All these wireless devices work on Qi standards and they use this device.
firstly Nokia launched two smartphones Lumia 820 and Lumia 920 in sep2012.
Google and LG launched the Nexus 4 in October 2012 which supports inductive charging
Motorola Mobility launched its Droid 3 and Droid 4, both optional supports the Qi standard.
Furniture with wireless technology:-
IKEA has a series of wireless charging furniture that supports the Qi standard.
In September 2015 AUDI wireless charging (AWC) presented a 3.6kW inductive charger and following it many automobile companies used this tech in their cars.
Protected connections – No corrosion when the electronics are enclosed, away from water or oxygen in the atmosphere. Less risk of electrical faults such as short circuits due to insulation failure, especially where connections are made or broken frequently.
Intermittent recharging with frequent reconnections without physically wearing down a charging connector.
Low infection risk – For embedded medical devices, the transmission of power via a magnetic field passing through the skin avoids the infection risks associated with wires penetrating the skin.
Durability – Without the need to constantly plug and unplug the device, there is significantly less wear and tear on the socket of the device and the attaching cable.
Increased convenience and aesthetic quality – No need for cables.
Slower charging – Due to the lower efficiency, devices take 15 percent longer to charge when supplied power is the same amount.
More expensive – Inductive charging also requires drive electronics and coils in both device and charger, increasing the complexity and cost of manufacturing.
Inconvenience – When a mobile device is connected to a cable, it can be moved around (albeit in a limited range) and operated while charging.