WIRELESS CHARGING

WIRELESS

CHARGINGMade By:-Sagar

Malhotra

What is Wireless charging ?The current coming from the wall power outlet moves through the wire in the wireless charger, creating a magnetic field. The magnetic field creates a current in the coil inside the device. This coil is connected to the battery and the current charges the battery. The two induction coils in proximity combine to form an electrical transformer.

How it WorksIt works on the

principle of Electromagnetic Induction.

Implementation

Continued…Induction chargers

typically use an induction coil to create an alternating electromagnetic field from within a charging base station, and a second induction coil in the portable device takes power from the electromagnetic field and converts it back into electrical current to charge the battery.

WIRELESS CHARGING STANDARDS• Qi is a set of guidelines

for inductive charging units. Right now it is a default standard.

• It's rounded up 84 manufacturers, semiconductors, and telecom providers under its wing so far, a number which no other organizations have come close to matching.

Other Standards

Underwriters Laboratories

CONSUMER ELECTRONIC ASSOCIATION

This standard under development by Qualcomm

AdvantagesProtected connections - no corrosion when the

electronics are all enclosed.Safer for medical implants - for embedded

medical devices, allows recharging/powering through the skin rather than having wires penetrate the skin, which would increase the risk of infection.

Convenience - rather than having to connect a power cable, the device can be placed on or close to a charge plate or stand.

No health implications: We won't need to worry about trying to duck the attack of invisible rays. The WPC established guidelines to ensure its products won't expose us to levels of radiation or ionization that could cause any harm to human tissue.

DisadvantagesLower efficiency, waste heat - The main disadvantages

of inductive charging are its lower efficiency and increased resistive heating in comparison to direct contact

More costly - Inductive charging also requires drive electronics and coils in both device and charger, increasing the complexity and cost of manufacturing.

Slower charging - due to the lower efficiency, devices can take longer to charge when supplied power is equal.

Inconvenience - In current implementations of inductive charging (such as the Qi standard), the mobile device must be left on a pad, and thus can't be moved around or easily operated while charging.

Incompatibility - Unlike (for example) a standardized MicroUSB charging connector, there are no de facto standards, potentially leaving a consumer, organization or manufacturer with redundant equipment when a standard emerges

ApplicationsIn the home:Use your Qi-compatible kitchen counter to power

your a blender, or boil a pot of water. The sensors in the counter work to keep the pot

boiling, even though the surface itself is cool to the touch.

If the pot needs to boil for ten minutes and then simmer for two, you'll be able to program it to do so without need for manual adjustments.

In the car: As demonstrated by Fulton Innovation at CES 2011, we may also begin seeing electric-powered vehicles get powered up via a manhole-sized charging pad.

In the office:Imagine a conference room in which the table is hooked up with Qi. Every person's laptop can be getting fully charged during the presentation, eliminating the need to have several power outlets scattered up and down the room with dozens of accompanying cords. 

In the store:At the grocery store, you tell a smartphone

app which items you need to pick up. Each product would sit on top of a Qi pad

that triggers an electrolumiscient label on the item, lighting it up as you approach it.

Milk could flash different colored labels when it gets closer to (and eventually reaches) its expiration date, making it much easier for employees to identify and get rid of it.

In public:If you're heading to the coffee shop, chances

are you're bringing your laptop or tablet. Having charging pads embedded into the tables will keep you from lugging extra cords around, leaves extra room for you (and others) to enjoy, and keeps others from tripping on your wires. Your lawyer will thank you.

The same goes for airports, where Qi is already starting to get integrated into seats and tables. Soon the time will come when you don’t need to bring your charger with you in flight.

BESIDES INDUCTIVE CHARGING, WHAT ELSE IS THERE?

WiTricityPowerbeamRCA Airpower

PowercastIt coverts radio waves to DC current.The idea is to install a transmitter somewhere

in the house that broadcasts RF energy in the 850-950MHz range, which an embedded sensor can pick up and convert into a trickle charge from up to 40 feet away.

PowerbeamIt uses optical "beams" to transmit energy

wirelessly up to 40 feet away.the amount of energy that can be transmitted

currently is around 5W.It technically can charge devices up to 10W,

but it is not useful for anything larger than a phone or tablet.