Power Play with Automotive Transmitters
Industry Standard: Qi
Challenge: Wireless power in automobilies requires coils that can withstand vibration, temperature extremes and moisture for up to 13 years, the average scrap rate of a vehicle. Litz - wire coils are not suitable for this challenge
NuCurrent Power Play: According to Texas Instrument’s testing, NuCurrent’s PCB coils had a 20% higher quality factor than the nearest competitor due to the lower ESR, and Texas Instruments fast-tracked NuCurrent’s designs for inclusion in the Wireless Power Consortium’s Qi specification as the A21 coil.
Outcome: Auto manufacturers have a durable and efficient solution to provide their customers with all of the advantages of high efficiency wireless charging without fearing coil deterioration and breakage over time.
Durable and Scalable Antennas for Auto Industry
Auto manufacturers are excited about wireless charging. Auto owners can simply set their phone down on the center counsel of their vehicle and it will be re-charging while they are driving. There is no need to fumble with distracting wires anymore while your eyes and hands should be on the road.
However, the first generation of wireless power coils considered by auto manufacturers turned out to be unsuitable for the automotive environment. Those coils (known as the A6 coil under the Wireless Power Consortium’s Qi standard) are made out of litz wire, which is prone to inconsistencies and breakage in demanding environments such as vehicles. Coils need to withstand vibration, temperature extremes and moisture for around 13 years to be reliable for vehicles. Litz wires are made of multiple twisted/braided wires that are glued together in a coil fashion and then glued onto a substrate to hold the assembly together. Not only are the coils very inconsistent in performance due to the construction, but they are also not durable.
NuCurrent worked with Texas Instruments to develop a more durable and consistent solution for automotive and other harsh environments. NuCurrent provided a PCB solution that outperformed all other PCB solutions provided by other companies by a 20% higher quality factor due to the lower ESR in NuCurrent’s coils. Based on this advantage in efficiency, durability and consistency, Texas Instruments promoted this design to the Wireless Power Consortium and it is now known as the A21 standard coil under the Qi standard.SEE THE NEXT POWERPLAY
Based on this advantage in efficiency, durability and consistency, Texas Instruments promoted this design to the Wireless Power Consortium and it is now known as the A21 standard coil under the Qi standard..