Electric Vehicle Chargers

New research increases efficiency of wireless power transfer

By on Aug 13, 2015 in Wireless Power |

New research from North Carolina State University and Carnegie Mellon University shows that wireless power transfer efficiency can be more than doubled using a MRFE – Magnetic Resonance Field Enhancer.

Wireless power transfer has been around for years, but until recently was limited in range to a few inches.  Recent advances in magnetic resonance have improved ranges to several feet.  Magnetic waves, much like audio waves, resonate at particular frequencies.  Tapping a tuning fork set for C flat will cause an nearby tuning fork tuned to C flat to vibrate and issue the same note.  When two metal coils are tuned to the same frequency, running AC current at the tuned frequency in the first coil can induce a current in the second coil.

The MRFE is a device that can be as simple as a copper loop that is tuned to the frequency of the power transfer system and, based on the research, improves the efficiency of the whole system.  This has potential to make wireless power transfer a practical solution for electric vehicle chargers.