02-05-2011, 02:47 PM
[attachment=13250]
1.Abstract
“NECESSITY IS THE MOTHER OF INVENTIONS”…
A problem that’s hindering the freedom and productivity of true mobility in our lives is our need to carry and use bulky chargers, power adapters and cords for all the mobile electronic devices we use, such as cell phones, laptop computers, portable music players and many others. What if there were a single charging solution that would make all these chargers and adapters redundant, that could charge all our devices simultaneously, and would be as simple as placing a mobile device down on a desk!!
This necessity has led to the innovative invention of a ”WIRELESS RECHARGING SYSTEM”
Instead of each device needing its own charger, it is possible to recharge phones and cameras by placing them on a plastic pad the size of a mouse mat. A dense array of coils buried in the pad will transmit energy to the gadget to charge its batteries. And it will be possible to charge as many gadgets as can fit on the pad at once.
This next-generation solution wirelessly charges any device - ranging from PDAs and mobile phones to personal music players, imaging devices etc and is dedicated to revolutionizing electric power delivery to mobile devices through safe, sleek, wire-free means.
2.Introduction
The tangle of cables and plugs needed to recharge today's electronic gadgets could soon be a thing of the past. No messy wires, no tangled cord, no multiple plugs!
Imagine a world where all your portable devices can be charged and powered simply by placing them on a flat pad. New wireless technology lets people recharge notebooks, cell phones and other devices by setting them on a pad instead of plugging them in or dealing with a docking station.
This next generation solution is based around technology that uses inductive coupling as a means of power transfer - which means you don't need any wires, connectors or contacts between the pad and the device. The pads use electromagnetic induction to charge devices.
3.Components
The wireless recharging solution has two parts:
3.1.Receiver Module
A sub-millimeter thin module that can be customized to about any size, shape or curve of a device is fixed inside the device and makes no visible impact to product appearance. Designed for use in PDAs, mobile phones, personal music players and portable gaming devices, as well as a host of other consumer electronic products, it enables immediate, safe and contact less recharging for the first implementation of a truly wireless mobile lifestyle.
3.2.Recharging Pad
This Pad is a thin (less than 6mm) universal wireless charging platform that plugs into any electrical outlet and can be built into any surface with no possibility of shock or discharge.
The base can deliver over 240W, is safe from spills and does not emit radiation or cause radio interference.
The base station is plugged into an AC adapter and can deliver up to 30V DC to an individual device. It's also completely safe, and if any charge were delivered to a person, it would be at the level of a low-voltage battery, virtually imperceptible to humans and certainly not harmful. The final base units will be waterproof and protected from electrostatic charges.
Any device fitted with the module instantly begins to recharge when placed anywhere on the Pad in a safe and totally contact less fashion and multiple devices can be charged simultaneously on a single pad.
This pad conforms to worldwide safety standards and regulations.
4.Working
The components work with the help of a chipset. The chipset basically has 2 kinds of chips and enables "Wire-Free" electric power transfer.
One chip, the tiny Adapter Controller, goes inside the mobile device and the other, the Contact Controller, gets built into the power base station.
These power bases, which come in a wide variety of shapes, sizes and colors, are each covered in an array of gold-plated contacts. The retrofitted mobile devices also have a pair of contacts.
The adapter chip inside the handheld device will, when placed on a base station, receive a very small electrical signal and message from the base controller chip that will power up the adapter chip. The base controller chip will sense for polarity. If there is none (say you place your hand on the base) then it does nothing. If it does find polarity and a signal from the adapter chip, it will then read information about the voltage level necessary to run the mobile device and begin charging and powering it.
Because of the array of contacts—from dozens to hundreds, depending on base size—there's no need to place the device in a special spot or position on the base. In fact, the bases accept multiple devices, charging and powering them all at once. Thus, there is no need for alignment of receiving module and charging base.
5.Basic Principle
Researchers have known that wires don’t always need to be in contact for electric power to get transferred.
This wireless recharging technology can work on two principles:
i. resonance ii. electro magnetic induction
5.1.Resonance
It is a phenomenon that causes an object to vibrate when energy of a certain frequency is applied. When you have two resonant objects of the same frequency, they tend to couple very strongly. Resonance can be seen in musical instruments. For example, when you play a tune on one, then another instrument with the same acoustic resonance will pick up that tune, it will visibly vibrate.
Instead of using acoustic vibrations, this system exploits the resonance of electromagnetic waves. Electromagnetic radiation includes radio waves, infrared and X-rays.
The technology is based on a method that uses an electromagnetic field to couple the power source to the gadget to be charged. Energy is transferred to the gadget because its antenna resonates at the same frequency as the transmitter, while other objects in the room do not absorb energy because they do not resonate at this frequency. The researchers call this process non-radiative energy transfer. In addition, the transmitter would reabsorb much of the energy that is not absorbed by the gadget.
Thus, a simple copper antenna designed to have long-lived resonance could transfer energy to a laptop or a mobile phone with its own antenna resonating at the same frequency.
Gadget and power source each employ the same resonant structure, which is an antenna for exchanging energy. The researchers investigated two types of resonant structures – a disk of dielectric material and a loop of wire bisected by capacitive plates. The simulations suggested that the loop would be a better choice under real-world conditions because less energy would be absorbed by nearby objects including humans. Calculations suggested that energy transfer efficiencies of 15% or greater could be achieved, which the researchers claim is large enough for practical applications.
working with resonance
1) Power from mains to antenna, which is made of copper
2) Antenna resonates at a frequency of 6.4MHz, emitting electromagnetic waves
3) 'Tails' of energy from antenna 'tunnel' up to 5m (16.4ft)
4) Electricity picked up by laptop's antenna, which must also be resonating at 6.4MHz. Energy used to re-charge device.
5) Energy not transferred to laptop re-absorbed by source antenna. People/other objects not affected as not resonating at 6.4MHz.
5.2.Electromagnetic induction
Electric motors and power transformers contain coils that transmit energy to each other by the phenomenon of electromagnetic induction. English scientist Michael Faraday, who found out that a changing magnetic field induces a current in a nearby circuit, discovered this phenomenon.
One way to operate the system is to use electromagnetic induction to send recharging electricity to the battery. Contact less electricity delivery is made through a pad that has a coil for transmission, and a reception coil inside the rechargeable device. So, a current running in an emitting coil induces another current in the receiving coil; the two coils are in close proximity, but they do not touch. Thus, current flows through the receiving coil and charges up the rechargeable battery.
In addition to the coil there’s also a regulator, which adjusts the amount of power being supplied to the device so the battery charges correctly. By fitting the regulator into each device, a number of gadgets with different power requirements can be charged simultaneously.
Electromagnetic induction is a technology that is currently employed in a wide range of applications. Applications, which currently use induction for power transfer, include powering electric vehicles, recharging electric toothbrushes and powering smart-tags.
1.Abstract
“NECESSITY IS THE MOTHER OF INVENTIONS”…
A problem that’s hindering the freedom and productivity of true mobility in our lives is our need to carry and use bulky chargers, power adapters and cords for all the mobile electronic devices we use, such as cell phones, laptop computers, portable music players and many others. What if there were a single charging solution that would make all these chargers and adapters redundant, that could charge all our devices simultaneously, and would be as simple as placing a mobile device down on a desk!!
This necessity has led to the innovative invention of a ”WIRELESS RECHARGING SYSTEM”
Instead of each device needing its own charger, it is possible to recharge phones and cameras by placing them on a plastic pad the size of a mouse mat. A dense array of coils buried in the pad will transmit energy to the gadget to charge its batteries. And it will be possible to charge as many gadgets as can fit on the pad at once.
This next-generation solution wirelessly charges any device - ranging from PDAs and mobile phones to personal music players, imaging devices etc and is dedicated to revolutionizing electric power delivery to mobile devices through safe, sleek, wire-free means.
2.Introduction
The tangle of cables and plugs needed to recharge today's electronic gadgets could soon be a thing of the past. No messy wires, no tangled cord, no multiple plugs!
Imagine a world where all your portable devices can be charged and powered simply by placing them on a flat pad. New wireless technology lets people recharge notebooks, cell phones and other devices by setting them on a pad instead of plugging them in or dealing with a docking station.
This next generation solution is based around technology that uses inductive coupling as a means of power transfer - which means you don't need any wires, connectors or contacts between the pad and the device. The pads use electromagnetic induction to charge devices.
3.Components
The wireless recharging solution has two parts:
3.1.Receiver Module
A sub-millimeter thin module that can be customized to about any size, shape or curve of a device is fixed inside the device and makes no visible impact to product appearance. Designed for use in PDAs, mobile phones, personal music players and portable gaming devices, as well as a host of other consumer electronic products, it enables immediate, safe and contact less recharging for the first implementation of a truly wireless mobile lifestyle.
3.2.Recharging Pad
This Pad is a thin (less than 6mm) universal wireless charging platform that plugs into any electrical outlet and can be built into any surface with no possibility of shock or discharge.
The base can deliver over 240W, is safe from spills and does not emit radiation or cause radio interference.
The base station is plugged into an AC adapter and can deliver up to 30V DC to an individual device. It's also completely safe, and if any charge were delivered to a person, it would be at the level of a low-voltage battery, virtually imperceptible to humans and certainly not harmful. The final base units will be waterproof and protected from electrostatic charges.
Any device fitted with the module instantly begins to recharge when placed anywhere on the Pad in a safe and totally contact less fashion and multiple devices can be charged simultaneously on a single pad.
This pad conforms to worldwide safety standards and regulations.
4.Working
The components work with the help of a chipset. The chipset basically has 2 kinds of chips and enables "Wire-Free" electric power transfer.
One chip, the tiny Adapter Controller, goes inside the mobile device and the other, the Contact Controller, gets built into the power base station.
These power bases, which come in a wide variety of shapes, sizes and colors, are each covered in an array of gold-plated contacts. The retrofitted mobile devices also have a pair of contacts.
The adapter chip inside the handheld device will, when placed on a base station, receive a very small electrical signal and message from the base controller chip that will power up the adapter chip. The base controller chip will sense for polarity. If there is none (say you place your hand on the base) then it does nothing. If it does find polarity and a signal from the adapter chip, it will then read information about the voltage level necessary to run the mobile device and begin charging and powering it.
Because of the array of contacts—from dozens to hundreds, depending on base size—there's no need to place the device in a special spot or position on the base. In fact, the bases accept multiple devices, charging and powering them all at once. Thus, there is no need for alignment of receiving module and charging base.
5.Basic Principle
Researchers have known that wires don’t always need to be in contact for electric power to get transferred.
This wireless recharging technology can work on two principles:
i. resonance ii. electro magnetic induction
5.1.Resonance
It is a phenomenon that causes an object to vibrate when energy of a certain frequency is applied. When you have two resonant objects of the same frequency, they tend to couple very strongly. Resonance can be seen in musical instruments. For example, when you play a tune on one, then another instrument with the same acoustic resonance will pick up that tune, it will visibly vibrate.
Instead of using acoustic vibrations, this system exploits the resonance of electromagnetic waves. Electromagnetic radiation includes radio waves, infrared and X-rays.
The technology is based on a method that uses an electromagnetic field to couple the power source to the gadget to be charged. Energy is transferred to the gadget because its antenna resonates at the same frequency as the transmitter, while other objects in the room do not absorb energy because they do not resonate at this frequency. The researchers call this process non-radiative energy transfer. In addition, the transmitter would reabsorb much of the energy that is not absorbed by the gadget.
Thus, a simple copper antenna designed to have long-lived resonance could transfer energy to a laptop or a mobile phone with its own antenna resonating at the same frequency.
Gadget and power source each employ the same resonant structure, which is an antenna for exchanging energy. The researchers investigated two types of resonant structures – a disk of dielectric material and a loop of wire bisected by capacitive plates. The simulations suggested that the loop would be a better choice under real-world conditions because less energy would be absorbed by nearby objects including humans. Calculations suggested that energy transfer efficiencies of 15% or greater could be achieved, which the researchers claim is large enough for practical applications.
working with resonance
1) Power from mains to antenna, which is made of copper
2) Antenna resonates at a frequency of 6.4MHz, emitting electromagnetic waves
3) 'Tails' of energy from antenna 'tunnel' up to 5m (16.4ft)
4) Electricity picked up by laptop's antenna, which must also be resonating at 6.4MHz. Energy used to re-charge device.
5) Energy not transferred to laptop re-absorbed by source antenna. People/other objects not affected as not resonating at 6.4MHz.
5.2.Electromagnetic induction
Electric motors and power transformers contain coils that transmit energy to each other by the phenomenon of electromagnetic induction. English scientist Michael Faraday, who found out that a changing magnetic field induces a current in a nearby circuit, discovered this phenomenon.
One way to operate the system is to use electromagnetic induction to send recharging electricity to the battery. Contact less electricity delivery is made through a pad that has a coil for transmission, and a reception coil inside the rechargeable device. So, a current running in an emitting coil induces another current in the receiving coil; the two coils are in close proximity, but they do not touch. Thus, current flows through the receiving coil and charges up the rechargeable battery.
In addition to the coil there’s also a regulator, which adjusts the amount of power being supplied to the device so the battery charges correctly. By fitting the regulator into each device, a number of gadgets with different power requirements can be charged simultaneously.
Electromagnetic induction is a technology that is currently employed in a wide range of applications. Applications, which currently use induction for power transfer, include powering electric vehicles, recharging electric toothbrushes and powering smart-tags.
