Wireless charging is set to be a major theme at this year's Mobile World Congress (MWC) in Barcelona, with many of the big smartphone manufacturers including Samsung, LG, Motorola, Nokia and Apple investing in the technology. But what is it and how does it work?
Wireless charging (also known as inductive charging) uses an electromagnetic field to transfer energy between two objects. Inventor Nikola Tesla was the first to demonstrate wireless power transmission in 1891, when he succeeded in lighting electric lamps without wires.
It took over a century for the technology to find its way into the mainstream, but over the past few years wireless charging has finally emerged onto the consumer electronics market.
Some smartphones and smartphone accessories now have wireless charging capabilities built-in, and the technology is being integrated into all sorts of devices, appliances, public spaces and even vehicles, as companies look to make power cords obsolete.
For example, wireless charging pads can already be seen at around 50 McDonald’s locations in the UK, thanks to a deal between the fast food chain and Air-charge, and Starbucks also offers free wireless charging stations in 10 cafes in the UK.
Wireless Charging Guide: What is it and which phones are supported?
What is Qi?
Wireless charging is a new technology that allows charging over (very) short distances without cables.The advantage of wireless charging is that charging is quicker and easier, as you don’t have to plug and unplug each time – you just place your device on top of your wireless charging pad It also looks neater.
There are various competing standards for wireless charging. The most popular is Qi (pronounced ‘chee’), which has been supported by companies like Samsung, Google and Nokia however more and more manufacturers are taking advantage in some form or another
Phones and tablets with built-in Qi wireless charging
If your phone appears here, you just need to buy a wireless charger such as a wireless charging dock.
Once you’ve determined your phone has wireless charging built in or you’ve added it with an accessory, you just need a wireless charger.
There are plenty of Qi wireless chargers available, in different sizes, shapes and colours. You can get Qi chargers for your desk, for your car, or even portable Qi
Wireless Battery Charger Circuit Principle:
Wireless Power Transfer Circuit Diagram:
Wireless Mobile Charger Circuit Design: