wireless communication karan

8/6/2019 Wireless Communication Karan

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A

TECHNICAL PAPER

ON

WIRELESS

COMMUNICATION

(Wireless Energy Transfer, its application andchallenges in its commercialization)

PRESENTED BY:

Mr. Karan J. Thakkar Mr.

Shantanu V. Kulkarni

CONTACT NO: 08149751105

CONTACT NO: 07875086059

T.E (ENTC ENGG.)

T.E (ENTC ENGG.)

[email protected]

[email protected]

[DEPARTMENT OF ELECTRONICS AND TELECOMMUNICATION ENGINEERING]

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mailto:[email protected]:[email protected]:[email protected]:[email protected]


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KITS COLLEGE OF ENGINEERING, KOLHAPUR

ABSTRACT

In 1895, Guglielmo Marconi opened the way for modern wireless communications by

transmitting the three-dot Morse code for the letter S over a distance of three kilometers using

electromagnetic waves. From this beginning, wireless communications has developed into

rapidly growing segment of the communications industry, with the potential to provide high-

speed high-quality information exchange between portable devices located anywhere in the

world. Potential applications enabled by this technology include multimedia Internet-enabled cell

phones, smart homes and appliances, automated highway systems, video teleconferencing and

distance learning, and autonomous sensor networks, to name just a few. From satellite

transmission, radio and television broadcasting to the now ubiquitous mobile telephone, wireless

communications has revolutionized the way societies function.

An important, futuristic and evolving application of the wireless technology is Wireless Energy

Transfer, often called as Wireless Power Transmission (WPT) has been discussed. The

concept of WPT has been in existence since 1820 when Andr-Marie Ampre developed

Ampres law showing that electric current produces a magnetic field (Ampres Circuital Law).

In 1891, Nikola Tesla demonstrated the wireless illumination of phosphorescent lamps at the

World's Columbian Exposition in Chicago. From then onwards various laws, mathematical andpractical models were formulated for efficient energy transfer over long distances.

In this paper, the concept of wireless power transmission for space application has beenexplored and the challenges are identified from a system perspective. By transmitting atmicrowave frequency, the electromagnetic wave beam can be focused to improve overallefficiency. However, lightweight high power microwave devices and circuits operating with highefficiency are required. Among various semiconductor technologies, GaN has the best powerdensity and power handling capability. High efficiency rectifier circuits using GaN diodes areused as examples and detailed analysis is presented.

Along with the analysis of this application of WPT, the challenges faced in thecommercialization of WPT have also been discussed.

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KEYWORDS: Wireless Communication, Wireless energy transfer, Regenerative fuelcells(application), Detailed analysis, Commercialization, Breakthroughs

TABLE OF CONTENTS

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1. What is Wireless Energy Transfer?

2. History

3. Methods For Wireless Power

Transmission

Near Field Far Field

4. Specialized Application:

Remote Wireless Power Transmission

for Regenerative Fuel Cells

5. Detailed Analysis

6. Challenges in commercialization of

Wireless Power Transmission

7. Recent Breakthroughs

8. Conclusion

9. References


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WHAT IS WIRELESS ENERGY TRANSFER?

Wireless energy transfer orWireless Power Transmission (WPT) is the process that takes

place in any system where electrical energy is transmitted from a power source to an electrical

load without interconnecting wires. Wireless transmission is useful in cases where instantaneous

or continuous energy transfer is needed but interconnecting wires are inconvenient, hazardous, or

impossible.

What makes this process unique is that there is no usage of any type of wiring to connect the

system to a source of power. Wireless energy transfer has to do supplying operational power to a

system that needs to function when connection via electrical wiring or cable is unavailable orinefficient.

In last few years, our society experienced a silent, but quite dramatic, revolution in terms of the

number of autonomous electronic devices (e.g. laptops, palm pilots, digital cameras, household

robots, etc.) that we use in our everyday lives. Currently, most of these devices are powered by

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batteries, which need to be recharged very often. This fact motivated us to think whether there

exist physical principles that could enable wireless powering of these and similar devices.

An example of how wireless power transfer could work to recharge laptops:

HISTORY

Ever since Andre-Marie Ampre codified the laws of naturedictating that an oscillating

magnetic field produces an electric field and that an oscillating electric field produces a magnetic

field (Ampres circuital law)history has been littered with theories and attempts to enable the

wireless transfer of energy for the purposes of powering lights, objects, and devices.

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In 1893, almost 120 years ago, Tesla demonstrated wireless energy transfer at the World

Fair in Chicago by providing power to a series of phosphorous light bulbs, wirelessly.

In 1904, at the World Fair in St. Louis, a prize was offered for anyone who could

successfully transmit enough energy over a distance of 100 feet to power a dirigible.

In 1964, William Brown demonstrated a model helicopter that could fly by receiving

power via a microwave beam over a distance of one mile.

In 1968, Peter Glaser proposed wirelessly transferring solar energy captured in space

using "Powerbeaming" technology. This was the first description of a solar power

satellite.

In 1971, Prof. Don Otto developed a small trolley powered by induction at The

University of Auckland, in New Zealand.

In 1988, A power electronics group led by Prof. John Boys at The University of

Auckland in New Zealand, developed an inverter using novel engineering materials and

power electronics and concluded that power transmission by means of electrodynamic

induction should be achievable. A first prototype for a contact-less power supply wasbuilt by Auckland Uniservices..

METHODS FOR WIRELESS POWER TRANSMISSION

Fundamentally, there are two different means of wirelessly transferring power.

1. Near Field

Near-field transmissions typically involve the use of inductive techniques andmagnetic fields to move energy across much shorter distances. Near field energy itselfis non radiative, but some radiative losses will occur. In addition there are usually

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resistive losses. Near field transfer is usually magnetic (inductive), but electric(capacitive) energy transfer can also occur.

The following are the types of near field energy transfer methods:

Induction (Inductive Coupling) Resonant Energy Transfer

Electrostatic Induction (Capacitive Coupling)

2. Far Field

Far-field methods permit long-range power transfers and typically involve

beamed power (lasers) or radio and microwave transmissions. Far field methods

achieve longer ranges, often multiple kilometer ranges, where the distance is much

greater than the diameter of the device(s). With radio wave and optical devices the

main reason for longer ranges is the fact that electromagnetic radiation in the far-field

can be made to match the shape of the receiving area thereby delivering almost all

emitted power at long ranges.

The following are the types of far field energy transfer methods:

Microwave Power Transmission

Laser Power Transmission

Pros and cons: lasers vs microwaves

Size reduction: The most important benefit of laser beaming over microwaves is thereductiionn in size of the transmitting and receiving antennas. The size reduction of thespace-based transmitting antenna also has significant cost-reduction impact.

Interference: Amajor issue in space solar power systems employing microwave power

transmission is their potential interference with satellite communication systems. Lasers,however, avoid these interference issues, both because of the great disparity infundamental frequencies between lasers and satellite communications bands (adifferences of roughly five orders of magnitude) and the fact that the narrow laser beamsare less likely to have significant sidelobes that could introduce interference.

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Atmospheric and weather effects: Both microwave and laser beams are attenuated bythe Earths atmosphere and its weather dependent particulate content.

Safety: the consequences of any intrusion into the beam by people, animals, or artifactscan be much more serious for the laser than for the microwave beam.

Technical immaturity: Laser power transmission technologies are relatively immature

as compared to microwave power beaming because of slowly eveloving technologies oflaser power transmission.

(With a laser beam centered on its panel of photovoltaic cells, a lightweight model plane makesthe first flight of an aircraft powered by a laser beam inside a building at NASA Marshall SpaceFlight Center)

APPLICATION

(Remote Wireless Power Transmission for Regenerative

Fuel Cells)

For wireless power transmission using microwave, by transmitting at microwave frequency, theelectromagnetic wave beam can be focused to improve overall efficiency. However, lightweighthigh power microwave devices and circuits operating with high efficiency are required. Amongvarious semiconductor technologies, GaN has the best power density and power handlingcapability. High efficiency rectifier circuits can be built using GaN diodes.

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Fuel cells have been used in NASAs space missions. Fuel cells use hydrogen and oxygen togenerate electricity. Once the fuels (hydrogen and oxygen) are consumed, the fuel cells can nolonger generate the power. To ensure a successful mission, the spacecrafts must carry enoughfuels. This means increased size and weight, which in turn increases the energy consumption

during the mission. The regenerative fuel cell (RFC) can be recharged to restore the energycapacity. RFC will be used in NASAs future space projects including planetary solar electricaircraft, lunar base, and Mars base.

However, the recharging needs the electricity and the regenerative fuel cells have to be sent to arecharging station. In space missions, immediate availability of power is critical, especiallyduring an emergency situation. The possibility of losing power during a mission presents alifethreatening risk. When this happens, emergency delivery of backup energy sources in timebecomes extremely critical. The physical delivery of fuel cells takes time in space missions.Therefore, scientists have been searching a method to charge the regenerative fuel cells on site.

This problem of energy can be solved by the use of microwave wireless power transmission.

Properties of Microwave Wireless Power Transmission

Beamed microwave power transmission has the following unique features asa means of transferring energy from one point to another :

No need for massive cables for energy transportation from source todestination

Transfer of energy at the speed of light and flexibility to changedirection of energy transfer

No energy is lost in transmission in space through vacuum and verylittle loss in Earths atmosphere at lower frequencies

Energy transfer between points is independent of gravitational forcebetween the source and destination

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CHALLENGES IN COMMERCIALIZATION OF WIRELESS

POWER TRANSMISSION

WPT applications hold the promise of providing alternative ways of providing electric power,space transportation and wide area communications. However, there are many challenges thatmust be faced before such applications become reality.

THE FREQUENCIES CHALLENGE

Emissions resulting from WPT commercial activities are likely to extend beyond the borders of asingle nation . Therefore, international cooperation is required in the needed allocation ofspectrum to offer WPT service, particularly worldwide.

THE SELLING CHALLENGE

The concept of WPT is so far out of the scope of the normal range of knowledge that it is adifficult sell. Furthermore, people fear the unknown. The challenge is to develop a technical andeconomic legitimacy which could be aided by demonstrations and publicity in more than onenation.

THE GEOMETRY CHALLENGE

Some proposed WPT applications require use of several equatorial land mass locations spread

around the globe. No single nation can meet that challenge. International cooperation will bemandatory for such service.

THE WORLD MARKET CHALLENGE

The likely market size for a viable economic enterprise must include many nations of the World.To produce adequate return on investment for many WPT activities will require a market that islarger than just a single country.

RECENT BREAKTHROUGHS

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In 2007, a group led by MIT Professor Marin Soljai (a Croatian physicist) announced

that they had discovered a novel way of transmitting electricity without the use of

wires.They did this by wirelessly powering a 60W light bulb from a distance of 2 meters

using electrodynamics induction. The system works by creating a strong electromagnetic

resonance between the sending and receiving coils. even with people sitting in between.

The transmission of power took place with almost 45% efficiency.(See figure for setup)

In 2008, Intel reproduces Nikola Tesla's original 1894 implementation of Electrodynamic

Induction and Prof. John Boys group's 1988 follow-up experiments by wirelessly

powering a nearby light bulb with 75% efficiency.

In 2009, Lasermotive used diode laser to win $900k NASA prize in power beaming,

breaking several world records in power and distance, by transmitting almost a kilowatt

of power over more than several hundred meters.

In 2009, Sony showed a wireless electrodynamic-induction powered TV set receiving

60W over 50 cm.

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In 2010, Haier Group debuts the world's first completely wireless LCD television using

electrodynamic induction wireless energy transmission method and the Wireless Home

Digital Interface (WHDI).

CONCLUSION

Communication between the wireless devices and the power source is required for wirelesspower to be transferred safely among devices in a timely fashion. The requirements for thiscommunication include high reliability and security, low latency and the ability to communicateunder conditions of high interference from the extremely high power that is flowing in parallelwith the communication data.Keeping these necessities in mind, Wireless Power Transmission isslowly evolving into a very powerful tool.

The use of wireless energy for space ventures based on the wireless charging of Regenerative

Fuel Cells (RFC) will dramatically decrease the cost for carrying heavy batteries to support thespaceship at critical times and also reduce the overall energy consumption. This would finallyenable the taxpayers money i.e our money to be put to better use elsewhere.

There are many challenges to WPT commercialization which may be met with internationalcooperation. International consortia will be required to raise the tremendous capital investmentsthat WPT will require.

According to consumer research done by IEEE, wireless power charging ranks presently withinthe top 20 percent of consumer lifestyle concerns due to the inconvenience of power cords. Justas the cellular phone has dramatically changed how we communicate, wireless power transfer

technology will revolutionize how power is delivered seamlessly to devices wherever they areand whenever needed. Whether it is for an electric vehicle or a lawn mower, wireless powertransfer will open an avalanche of technology and product innovation, and new businessopportunities to the world.

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REFERENCES

1. www.google.com

2. www.mit.edu

3. www.stanford.edu

4. www.nasa.gov

5. www.ieee.org

6. www.wikipedia.org

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