Abstract
Transfer of electrical power from source to load through wires is a conventional and well-known technology. However, in recent years wireless power transfer has gained interest especially in charging applications of portable devices such as smart phones, PDAs and digital cameras etc. Such devices are equipped with small batteries which often require frequent charging. Existing wireless chargers work on the principle of mutual induction, which requires charging device to be properly placed on a charging pad for charging purpose. However, these wireless chargers can transmit power efficiently to a distance of only up to a few millimeters. Transmission of power to relatively longer distances (i.e. up to about 1 meter) requires larger diameter of coils making it impractical for use in portable devices due to their inherent small size. Magnetic resonance coupling technique is a potential candidate for such mid-range applications. In this paper, authors have investigated interdependence of various parameters affecting the power transfer efficiency of magnetic resonance coupling. The main aim of the work is to achieve a practically realizable wireless charging system while optimizing various factors such as distance, resonator size, conductor size and resonance frequency. Resonating two coils at same frequency having significant difference in sizes is a challenge. This is achieved with external LC impedance matching circuit and is simulated in this paper. Based on the results, a wireless charger design is proposed to achieve maximum efficiency using smaller coil size on the receiver side, making it suitable for portable devices
Keyword(s)
A PHP Error was encountered
Severity: Notice
Message: Undefined variable: pub_keywords
Filename: front/publication.php
Line Number: 77
Backtrace:
File: /home/prdbpk/public_html/application/views/front/publication.php
Line: 77
Function: _error_handler
File: /home/prdbpk/public_html/application/controllers/Front.php
Line: 221
Function: view
File: /home/prdbpk/public_html/index.php
Line: 315
Function: require_once
A PHP Error was encountered
Severity: Warning
Message: Invalid argument supplied for foreach()
Filename: front/publication.php
Line Number: 77
Backtrace:
File: /home/prdbpk/public_html/application/views/front/publication.php
Line: 77
Function: _error_handler
File: /home/prdbpk/public_html/application/controllers/Front.php
Line: 221
Function: view
File: /home/prdbpk/public_html/index.php
Line: 315
Function: require_once
A PHP Error was encountered
Severity: Notice
Message: Undefined variable: pub_info
Filename: front/publication.php
Line Number: 84
Backtrace:
File: /home/prdbpk/public_html/application/views/front/publication.php
Line: 84
Function: _error_handler
File: /home/prdbpk/public_html/application/controllers/Front.php
Line: 221
Function: view
File: /home/prdbpk/public_html/index.php
Line: 315
Function: require_once