wireless power transmission - - copy

8/8/2019 Wireless Power Transmission - - Copy

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Wireless Power Transmission

S.Karthik PrasannaM.Krishna Raj

II yr, Dept of ECE

Maamallan institute of tech,

Sriperumbadur.


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Outline

A brief history

Space Solar power

Microwave Power Transmission

Advantages

Drawbacks Conclusion


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A BriefHistory

WorldWar II developed ability to convert energy to microwavesusing a magnetron, no method for converting microwaves back to

electricity

1964William C. Brown demonstrated a rectenna which couldconvert microwave power to electricity

1968s idea for Solar Power Satellites proposed by Peter Glaser

Would use microwaves to transmit power to Earth from SolarPowered Satellites

Idea gained momentum during the Oil Crises of 1970s, but afterprices stabilized idea was dropped


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SpaceSolar Power

Our main objective- Exploit solar energy in

space


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Possible Designs


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Specifications

Collector area must be between 50 (19 sq

miles) and 150 square kilometers (57 sq miles) 50 Tons of material

Current rates on the Space Shuttle runbetween $3500 and $5000 per pound

50 tons (112,000lbs)=$392,000,000


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Microwave Power Transmission

How the power getsto Earth


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FromtheSatellite

Solar power from the satellite is sent to

Earth using a microwave transmitter Received at a rectenna located on

Earth

Recent developments suggest that powercould be sent to Earth using a laser


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Microwaves

Frequency 2.45 GHz microwave beam

Retro directive beam control capability

Power level is well below internationalsafety standard


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Rectenna

An antenna comprising a mesh of dipoles and diodes for

absorbing microwave energy from a transmitter andconverting it into electric power.

Microwaves are received with about 85%efficiency

Around 5km across (3.1 miles)

95% of the beam will fall on the rectenna


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Rectenna Design

Currently there are two different design types

being looked at Wire mesh reflector

Built on a rigid frame above the ground

Visually transparent so that it would not

interfere with plant life Magic carpet

Material pegged to the ground


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5,000 MW Receiving Station(Rectenna). This station is about amile and a half long.


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Advantages

Over Earth based solar power

SPS in lower orbit Reliable power

Power upto 10MW

Pollution free


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Drawbacks

Hindrance to satellites

Health hazards Rectana issues

Construction Cost and maintanance


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Conclusions

More reliable than ground based solar power

A best possible design for future In order for SPS to become a reality it several

things have to happen:

Government support

Cheaper launch prices

Involvement of the private sector

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