Survey Of Wireless Power Transfer Techniques In Charging Mobile Devices

ABSTRACT

KEYWORDS: Wireless Power Transfer, Magnetic Resonant Coupling, Quality Factor, witricity, electromagnetic field, magnetic field(flux),

Electromagnetic field:  electric and magnetic field together are referred to as electromagnetic field. Magnetic field (flux): The area around a magnet within which magnetic force is exerted. This result from the flow of current through wires or electrical charges and increases in strength as the current increases. Magnetic field is only produced when current is flowing. Witricity: wireless electricity system

 

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ABSTRACT

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Role of electricity in modern machine era is considered like circulation of blood in human body. Electrical energy has made human life easy and luxurious. Electricity is being distributed using the conventional grid which is in service for last hundred years. Conventional grid is characterized by out dated infrastructure, delayed communication and heavy transmission losses. One of the solutions of the heavy line losses is the transmission of electricity wirelessly which is called Witricity.

     Goal of wireless power transmission is to transfer electricity from source to destination in order to reduce high transmission losses. Wireless power transmission increases the portability and convenience. It also fulfils the demand of recent devices and technologies which already use wireless technique for different operations and communications like Wi-Fi being used in laptops and cellular phones for the access to the internet. Transfer of electric power without using wires is possible.

   Nicola Tesla is the pioneer of the wireless power transmission concept and he implemented his concept in 1902 with the technologies available at that time. Since then, many of the scientists involved in further extension of this idea and achieved positive results for the transmission at a close range [1]. In 2007, a team at the Massachusetts Institute of Technology (MIT), was successful in transferring the power wirelessly at a mid-range using magnetic coupling resonance by lighting a bulb 0f 60w at a range of 2m . Smart grid is the concept of modernizing the conventional grid by integration of advanced digital

communications. Wireless communications will play an important role for realization of smart grid. Witricity also helps in achieving the goals of 21st century power quality requirements and special applications. Electrical vehicles are supposed to replace the conventional internal combustion engines in smart grid. Wireless charging for mobile devices  is an important application of Witricity.