28-09-2016, 12:12 PM
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ABSTRACT:
In this current information age, mobile phones are the basic needs of every person. It has become an indispensible basic part of our life. Recharging of the battery in mobile phone seems to be complicated task since it is wired. In this paper we would like to propose the concept of charging the mobile phone using wireless communication. Wireless charging is set to be the major theme at this generation. It is the way of charging a device using microwave signals, which can eliminate the use of cables, power adapter etc. When a call attain a mobile phone which has Rectenna in it automatically start charging and keep on charging until the call gets terminated. Microwave power transfer(MPT) system works by converting power to microwave through a microwave generator and then transmitting the power through free space where it is received and converted back to power at a special device called a Rectenna.
DESCRIPTION:
RECTENNA:
A rectenna is a rectifying antenna that is used to convert electromagnetic energy into direct current electricity. They are used in wireless power transmission systems that transmit power by radio waves. In this, 2.45GHZ rectenna (slotted wave guided antenna) is used. This type of antenna has different wavelength is used for transmission and receiving . The effiency of the antenna is high
ANTENNA:
A antenna which is used as transceiver ie, transmits and receives the signals. Along with that it has an schottky diode is converts the RF wave into DC power. This diode works at 0.35V. And it has lowest voltage drop and highest speed and therefore have the lowest power losses due to conduction and switching.
IMPEDANCE MATCHING AND FILTERING:
Impedance matching circuit is used to transfer maximum power and it has low power losses . the filter used in this circuit is low pass filter which aborbs the high frequencies and allows low frequencies to pass.
Zload=z*source
RECTIFICATION:
A rectifier is a electrical device composed of one or more diodes that converts AC to DC and vice-versa. A diode is a one way valve that allows an electric current to flow in only one direction. This process is called rectification.
BATTERY:
A Battery is a storage device which is used to accumulate and stores the energy. Receiving the signals from rectenna some amount of voltage such as 3V,5V and 7V is stores in battery.
ADC:
An analog to digital conveter is a device that converts a physical quantity to digital number that represents the quantity amplitude. It receives the signals from rectenna and battery and it can take only the particular voltage from battery. EXAMPLE: It can take upto 5V of current and passes to the ATMEL microcontroller.
ATMEL:
An ATMEL or ARC 89C51 is a 8 bit microcontroller which has 4KB ROM (PEROM) and 128 bytes of RAM . It has inbuilt UART for serial communication . in this, RISC(REDUCED INSTRUCTION SET COMPUTER) operation is used. It receives the signals from ADC