WIRELESS CHARGING

WIRELESS CHARGING

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WIRELESS CHARGING - Overview

------------ PAGE 1 ------------ ------------ PAGE 2 ------------ WIRELESS CHARGING ------------ PAGE 3 ------------ Contents ƒß What is Wireless Charging? ƒß Types of Charging ƒß Design Overview ƒß Applications ƒß Advantages of Wireless Charging ƒß Limitations ƒß Conclusion ƒß References ------------ PAGE 4 ------------ What is Wireless Charging? ƒß Wireless charging is one of the several methods of charging batteries without the use of cable or device specific AC adaptors. ƒß Wireless charging can be used for a wide variety of devices including cell phones laptop computers and MP3 players as well as larger objects such as robots and electric cars. ------------ PAGE 5 ------------ Methods of Charging There are three types of wireless charging :- ƒß Resonance Charging ƒß Inductive Charging ƒß Radio Charging ------------ PAGE 6 ------------ Resonance Charging ƒß It uses phenomenon of “ RESONANCE”, that causes an object to vibrate when energy of certain frequency is applied. ƒß Two copper coils are used one attached to transmitter and another to receiver. ƒß Both coils are tuned to same electromagnetic frequency. ƒß These coils when placed close to one another power is transferred. ------------ PAGE 7 ------------ Examples:- ƒß Electric cars ƒß Robots ƒß Vacuum Cleaners ƒß Laptop computers and Other items that require large amounts of power. ------------ PAGE 8 ------------ Inductive Charging ƒß Inductive charging is one kind of short distance wireless charging. ƒß This method works on the principle of “ ELECTROMAGNETIC INDUCTION” where the charger device will create an E. M field with alternating polarity using a coil of insulated copper wire and a similar coil will be placed inside the mobile device which will convert E. M field back to electric current there by charging the battery. ------------ PAGE 9 ------------ Examples:- ƒß MP3 players. ƒß Personal Digital Assistants ( PDA’s). ƒß Electric toothbrushes. ƒß Waterproof Vibrating Razors. and Other mid- sized items ------------ PAGE 10 ------------ Radio Charging ƒß signals This method is on the basis that Radio Waves are widely in use to transmit and receive cellular telephone, television, radio and Wi- Fi. ƒß A Radio wave once transmitted, propagates in all directions until it reaches an antenna tuned to proper frequency to receive it. ƒß A transmitter plugged in to a socket, generates radio waves, when the receiver attached to the device is set to the same frequency as the transmitter, it will charge the device’s battery. ------------ PAGE 11 ------------ Examples:- ƒß Watches. ƒß Hearing aids. ƒß Medical implants. ƒß Cell phones. ƒß Wireless keyboards and Other charging devices with small batteries and low power requirements. ------------ PAGE 12 ------------ Design Overview The basic design mainly consists of three sole parts: ƒß Transmitter ƒß Antenna ƒß Receiver ------------ PAGE 13 ------------ Transmitter ƒß A power transmitter acts as a power source. ƒß It will transmit power to the receiver side. ƒß The transmission signals are mainly in between the RF/ Microwave range. ( Typically 900Mhz) ------------ PAGE 14 ------------ Antennas ƒß It plays an important role of mediator between transmitter and receiver. ƒß Important specifications: 1. Impedance of antenna. 2. Gain of antenna. ƒß Impedance of antenna should match o/ p impedance of power transmitter and i/ p impedance of rectifier ckt. ƒß Higher gain yields better result of design. ------------ PAGE 15 ------------ Receiver ƒß The receivers main purpose is to charge an AAA battery. ƒß For charging AC signal ( microwave signal with a typical value of 900 MHz) is taken and fed to a rectifier ckt to get a D. C signal. ƒß A full- wave rectifier ckt is used because of its simplicity and efficiency in converting A. C signal. ƒß At the o/ p of the rectifier, the signal is not a D. C signal yet. Thus by adding a capacitor and a resistor a smooth o/ p can be achieved. ------------ PAGE 16 ------------ Applications ƒß Wireless Charging Pad for mobile devices ------------ PAGE 17 ------------ Other Applications: ƒß Inductive Coupling- RFID. ƒß In- Vehicle Charging. ƒß Radio Charging. ƒß Ultra Wideband. ------------ PAGE 18 ------------ Benefits ƒß Provides consumers with freedom and convenience. ƒß The way the technology works is simple. ƒß Simultaneous charging of multiple devices. ƒß The plastic, packaging and electronic waste associated with charges is greatly reduced. ƒß Since it is wireless it is economic. ------------ PAGE 19 ------------ Limitations ƒß applicable for only small distance ƒß For the larger devices like electric car , charging stations may be limited ƒß Efficiency and power loss are the major problems ƒß ------------ PAGE 20 ------------ Conclusions: ƒß Research in to using wireless technology to supply to terminals is finally beginning to be realized. The technology provides a wide range of other obvious benefits, including better portability, lower cost and best of all the end of having to guess which charger go what gadgets. Charging will one day become a simple matter of dropping devices into the nearest charging pad. ------------ PAGE 21 ------------ References ƒß Espejel. J. D,” RF to DC power generation", University of Maryland, December 2003. ƒß http:// drum. umd. edu: 8003/ dspace/ handle/ 1903/ 173 ƒß Electronics today magazine, June 2008 th issue, page no 63- 66. ƒß www. Howdostuffwork. com ƒß www. WhatIs. com ------------ PAGE 22 ------------ THANK YOU…
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