Society of Automotive Engineers has begun work on the development of an international standard dedicated to the wireless charging for vehicles.
The wireless charging systems for electric cars do not yet have an international standard, but the Society of Automotive Engineers (SAE International) has started work to achieve the goal. The organization that is responsible for developing and defining the engineering standards for the automotive, aerospace and shipbuilding industries has made official the first framework (SAE TIR J2954) for plug-in hybrid vehicles and fully electric.
But how exactly does a system like this work? Wireless charging is based on the principles of electromagnetism. The electricity is passed through a coil – coils of a conducting material such as copper – that at that point creates a magnetic field. This allows current to be transferred to another coil without any physical contact.The wireless unit needed to be very close, now 10 cm is more than enough.
“This first set of documents will allow consumers to simply park their cars in spaces equipped with TIR J2954 equipment and go away without doing anything to recharge their power,” said Jesse Schneider, President of SAE International. There is also a discussion of charging, while the vehicle is in motion; dynamic applications will be evaluated in the future.
At the moment it was established four frequency bands for wireless charging and four power levels that will condition the charging rate (3.7 kW, 7.7 kW, 11 kW and 22 kW). “The current version uses the one-way charging from the power supply to the vehicle, but the two-way version could be examined in the future,” the statement said official press.