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Wireless electricity, or wireless power transfer (WPT), enables electrical energy transmission without wires, allowing devices to be charged remotely. Key types include inductive coupling for short-range applications, resonant inductive coupling for mid-range, and microwave/RF transmission for long-range uses. While it offers advantages like safety and convenience, challenges include efficiency loss with distance and alignment sensitivity.

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12 views4 pages

Document (2) ....

Wireless electricity, or wireless power transfer (WPT), enables electrical energy transmission without wires, allowing devices to be charged remotely. Key types include inductive coupling for short-range applications, resonant inductive coupling for mid-range, and microwave/RF transmission for long-range uses. While it offers advantages like safety and convenience, challenges include efficiency loss with distance and alignment sensitivity.

Uploaded by

sreesanth3690
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© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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ABSTRACT

WIRELESS ELECTRICITY

Wireless electricity, also known as wireless power transfer (WPT), is the transmission of
electrical energy without wires or physical connectors. The goal is to deliver power to
devices remotely — like charging your phone without plugging it in.

Key Types of Wireless Electricity

Type Principle Range Common Use

Inductive Coupling Magnetic fields between coils Short (mm–cm) Wireless


charging pads (phones, toothbrushes)

Resonant Inductive Coupling Tuned coils enhance transfer efficiency Mid-range


(cm–meters) Charging electric vehicles, drones

Capacitive Coupling Electric field between plates Short Prototypes and niche
uses

Microwave/RF Transmission Power beamed as microwaves or radio waves


Long (meters–km) Powering remote sensors, satellites

Laser-based TransferConverts electricity to laser, then back Long Space-based


solar power (experimental)

How Inductive Wireless Charging Works (Example)

1. A coil in the charging pad creates a magnetic field when powered.


2. A coil in the device (phone, etc.) picks up this field and induces a current.

3. That current charges the battery.

Advantages

No physical connection — safer in wet or rugged environments.

Convenience — just place your device on a charging pad.

Reduced wear — no mechanical parts to degrade.

Potential for continuous charging — for drones, robots, implants.

Challenges

Efficiency drops with distance.

Alignment sensitivity — especially in inductive systems.


Slower charging than wired alternatives.

Safety concerns — particularly with high-power or long-range systems.

Real-World Applications

Consumer electronics: Qi wireless charging for phones and wearables.

Electric vehicles (EVs): Wireless charging pads in parking spaces.

Medical implants: Charging inside the body without surgery.

Drones: Automatic charging without manual intervention.

Space projects: NASA and JAXA researching beaming solar power to Earth.

NAME: SREESANTH T J

SEMINAR PROJECT

ROLL NO :61
EEE

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