08-02-2012, 02:39 PM
Contactless Energy Transfer System
[attachment=17291]
INTRODUCTION
Contactless energy transfer is the process in which electrical energy is transferred between primary and secondary coils through inductive coupling, without electrical contact between the coils. The transfer of energy between devices without the use of physical plugs is a fascinating concept to say the least. The potential applications for such a technology are practically endless and can range from the transfer of energy between low power home and office devices to high powered industrial applications. Medical, marine, and other applications where physical electrical contact might be dangerous, impossible or at the very least problematic, are all prospective candidates for the use of contactless energy transfer.
WORKING
In contactless energy transfer, the main method of transferring energy between primary and secondary coils is through induction and magnetic fields. When primary and secondary coils are coupled through air and do not have a core to guide the magnetic field, the magnetic field spreads out through the air without any predominant path. Because of this, not all of the magnetic field produced by the primary coil is coupled with the secondary coil. The stray magnetic field does not contribute to the transfer of energy between the coils and is a waste of energy. It is possible that part of the stray magnetic field could undesirably couple with other electronic circuits in their vicinity. This is very dangerous, since large magnetic fields could induce extra currents into nearby circuits, causing malfunction or even damaging them. Another concern is the safety of humans and other living matter when exposed to these stray magnetic fields. Magnetic field shaping attempts to mold the magnetic field to maximize the coupling between primary and secondary coils and at the same time minimize the stray magnetic field.
CONCLUSION
The effect of a changing coupling between a primary coil and a secondary coil on the contactless energy transfer is studied.
[attachment=17291]
INTRODUCTION
Contactless energy transfer is the process in which electrical energy is transferred between primary and secondary coils through inductive coupling, without electrical contact between the coils. The transfer of energy between devices without the use of physical plugs is a fascinating concept to say the least. The potential applications for such a technology are practically endless and can range from the transfer of energy between low power home and office devices to high powered industrial applications. Medical, marine, and other applications where physical electrical contact might be dangerous, impossible or at the very least problematic, are all prospective candidates for the use of contactless energy transfer.
WORKING
In contactless energy transfer, the main method of transferring energy between primary and secondary coils is through induction and magnetic fields. When primary and secondary coils are coupled through air and do not have a core to guide the magnetic field, the magnetic field spreads out through the air without any predominant path. Because of this, not all of the magnetic field produced by the primary coil is coupled with the secondary coil. The stray magnetic field does not contribute to the transfer of energy between the coils and is a waste of energy. It is possible that part of the stray magnetic field could undesirably couple with other electronic circuits in their vicinity. This is very dangerous, since large magnetic fields could induce extra currents into nearby circuits, causing malfunction or even damaging them. Another concern is the safety of humans and other living matter when exposed to these stray magnetic fields. Magnetic field shaping attempts to mold the magnetic field to maximize the coupling between primary and secondary coils and at the same time minimize the stray magnetic field.
CONCLUSION
The effect of a changing coupling between a primary coil and a secondary coil on the contactless energy transfer is studied.
