BY-Anupam Panja (EE- R-01)Aniruddha sen (EE-R-23)Shiladitya Mukhejee (EE-R-54[09])

ContentsWhat is wireless electricityHOW WIRELESS POWER WORKS Wireless electricity in lay person’s termsHow it will be usedFuture use in businessCurrent usesBenefitsCost

What is it?Based on electromagnetic induction (using conductive materials in coils to create a magnetic field)

Resonant Magnetic Coupling: when two objects exchange energy through their varying or oscillating magnetic fields. -Natural frequencies of the two objects are approximately the same.

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HOW WIRELESS POWER WORKS :-

1. Magnetic coil (Antenna A) is housed in a box and can be set in wall or ceiling.

2. Antenna A, powered by mains, resonates at a specific frequency.

3. Electromagnetic waves transmitted through the air. 4. Second magnetic coil (Antenna B) fitted in laptop/TV etc resonates at same frequency as first coil and absorbs energy.

5. Energy charges the device.

In Layperson’s TermsWireless electricity is the transfer of power to adevice over the air.

— It will allow devices to be powered or charged (with the proper wireless attachments) without being plugged into a wall outlet or docked in a charging station.

How It Will Be UsedWireless electricity can be used to power or recharge:

Cell PhonesTVsComputersElectric CarsCordless ToolsIndustrial MachineryMedical Devices (pacemakers, etc.)Military Devices (unmanned robots, planes)Consumer AppliancesANYTHING ELECTRIC!

Future Uses In BusinessMore Efficient Office Buildings/Factories

Entire office buildings will run on wireless electricity

Employees computers, cell phones, printers will all stay charged throughout the business day

Electric appliances will not have to be placed around power outlets; running cords is no longer a hassle

Current UsesWireless charging padsElectric Toothbrushes:Both of these techniques use small electric fields to charge the devices.

Haier America Digital Products group has already developed a HDTV that transmits electricity and the HD signal, making the TV completely wireless

BenefitsMore Reliable/Less Costly- Never run out of battery power in wireless zones- Power transfers more efficiently than through wires

More Convenient- No more changing batteries- No messy cords

Environmentally Friendly- Reduces the use of disposable batteries- Reduces energy loss

LIMITATIONThe resonance condition should be satisfied and if any error exists, there is no possibility of power transfer.

Any possibility of very strong ferromagnetic material presence causes low power transfer due to radiation.

Cost?Cost is still undetermined.What they say is there are no exotic materials being used that would make it overly expensive.

Prices should be comparable to products already out.

CONCLUSIONThe optimal regime of efficient power transfer is Strongly coupled regime.

High κ/Γ ratio gives high power output. For no changes in κ/Γ ratio, there is no change in power transfer.

After designed the parameters with FEFD method and simulating for the κ/Γ ratio changes with and without the external objects, we can conclude that there is no large variation in κ/Γ ratio.