Wireless Charging Of Mobile Phones

In this paper, we have described a mechanism to transfer a low power DC voltage from one mobile to another for the purpose of charging the phone. We have dealt with coupling coils and their resonance. Colpitts Oscillator, Full-Bridge Rectifier and Voltage Regulator circuits have been implemented. This project gives us a new and convenient option of recharging our phones at times when charging from a phone remains the only option because of the lack of having proper charging outlets. This simple idea is a feasible and inexpensive one for mobile

As such, The particular consideration in the advertising plus the imagination in the general public include grabbed by it. During the last few years,Cell phone devices have received dramatical increase as well as there are at present close to a pair of billion dollars usersworld-wide. Indeed, in many formulated countries, cellular phones are getting to be an essential company deviceas well as a part of everyday life, as well as in many creating countries, cellular phones tend to be easily supplantingantiquated wireline

3. Power consumption: When a power outlet or portable generator is not available, mobile computers must rely entirely on battery power. Combined with the compact size of many mobile devices, this often means unusually expensive batteries must be used to obtain the necessary battery life.

The phone draws energy from a lithium ion battery. Currently, the lithium ion battery has the most energy per volume than any other battery. The lithium ion battery is also a good material to use because of it’s light weight. Another key feature of the lithium ion is its ability to recharge. However, it needs to be recharged properly. The battery needs to be fully charge; if it is overcharged or undercharged significant charging

Nearly everyone is using cell phones in their day routine lives. Cell phones have now become less of a novelty and more of a communication tool providing many utilities all in one package, from camera, video games, internet and apps; they combine business and personal convenience.

The first cell phone was created by Martin Cooper on April 3rd, 1973. Cell phones are radio receivers and transmitters that use electromagnetic energy to send and receive information. Energy travels in waves. The distance from one wave to the next is the wavelength. Frequency is the amount of times the wave oscillates up and down per second. The higher the frequency, the more energy. Frequency is measured in Hertz. One Hz is one wavelength per second. Different electronical things are operated at different rates of hertz. At this point, the fastest connection runs at a 2.1 GHz (gigahertz) range-- that’s 2.1 billion wavelengths per second. Cell phones use low radiation called radio frequency (RF). A cell phone sends and receives

Phones used to be wired and had to stay on a hook in the hook at all times for it to work but now they are mobile and can access to the internet from

Thirty-three years ago, On March 6th, 1983, the first commercial phone was introduced in the states. It offered around thirty minutes of battery life, and took over ten hours to charge completely, it weighed almost 2 pounds, was 10 inches tall, and cost nearly $10,000, adjusting for inflation. Nowadays, there are phones

* describe waves as a transfer of energy disturbance that may occur in one, two or three dimensions, depending on the nature of the wave and the medium

A fully charged cell phone is important as is a recharger or backup battery. Even so, the reception may be poor or broken in some areas.

The cell phone has transformed over the years, changing from a bulky phone to a compact device containing the capabilities of a computer. According to Russell Ware, a cell phone is “any portable telephone which uses cellular network technology to make and receive calls.” A cell phone works through a maze of cellular towers that cross the world. This connects mobile devices that allow texting and calling between two cellular devices. Motorola produced the first commercially available cell phone which officially went on sale in 1984 (Ware). This cell phone was called the DynaTAC 8000x which cost an extreme amount of money and only contained a battery of 30 minutes (Ware). Since this first masterpiece, the cell phone has advanced and developed into an entirely new object. Cell phones today contain the ability to text, call, use the internet, play games, and store files (Cell Phone).

Generally, they work by soaking up energy received from the sun’s rays and then converting it into useable electricity. This is a practice in the context of mobile phones is relatively new found and has not seen widespread commercialization. As with any young technology, there of course comes disadvantages with its use and function.

Motorola, famous amongst mobile phones, and one of the top cellular phone companies in the world till late 1990, later it was captured by the company Nokia. While writing this case we have thrown light on the challenges and problems faced by Motorola around 2006-2007. One of the ideas incorporated in order to recapture the market in the year 2006 was to slash the prices of almost all the cell phones which impacted the returns of the company. Motorola did announce in the year 2007 that they will revive shortly and would have the market share back.

A mobile phone works on a unique networked system which needs no wiring, no fixation and no botheration. Originally it was used in cars, airlines, and passenger trains but increasingly it is becoming ubiquitous. It is basically low- power radio telephone. In this magical system calls go through radio transmitters that are located within small geographical unit which are known as cells. Since each cell's signals are too weak to interfere with those of other cells operating on the same frequencies and more channels can be used than would be possible with high power radio frequency transmission. Narrow-band frequency modulation (FM) is the most common mode of transmission, each message is assigned a carrier, unique to the cell from which it is transmitted.

A rectenna is a rectifying antenna, a sort of antenna that is used to convert microwave energy or radio frequency energy into direct current signal that can power low sensor devices. They are modelled as a part of wireless power transmission systems that transmit power through radio waves or electromagnetic waves. A basic rectenna, comprises of a microstrip patch antenna with a RF diode. It is nonlinear rectifying element (for example Schottky diode, Zener diode, IMPATT diode.... etc.). The diode rectifies the alternating current or bidirectional current induced in the patch antenna by the RF waves, to generate DC or unidirectional