Great contribution to the development of the electronic society, ferrites that have passed 80 spring and autumn since the invention is still shining with new brilliance. TDK, which is a ferrite core as a raw material, is based on “the value of accessories for electronic components comes from material development†and constantly considers various new products and technologies.
In order to create a low-carbon society, how to further reduce power consumption has become a very important technical issue, and the role of material technologies such as ferrites and magnets has also increased. As wireless charging technology emerges, charging electronic devices without cables provides a convenient experience for portable device users, and designers are looking for more innovative problem solutions. Many rechargeable battery devices can benefit from either a portable device such as a smartphone or a system such as an electric car.
Figure: 3D electric car wireless charging reference display in TDK research and development
TDK's uniqueness is to start product development from magnetic materials, electrode materials, and functional organic materials. The company has developed its high-performance ferrite materials for power supply/receiving coils and developed an efficient wireless charging device for electric vehicles. Its concept based on 3D fast charging technology is to embed the charging coil in the underground of the parking space in the car after-installation system. The magnetic signal is emitted from a pre-embedded coil under the ground. After receiving the magnetic field signal, the receiving coil circuit provided on the electric vehicle can convert the magnetic field energy into electric energy to charge the electric vehicle.
The wireless charging system is characterized in that it can be easily charged by simply stopping the charging cable, and can be safely charged in both indoor and outdoor parking lots, in the rain or at night. At the same time, due to the use of TDK's unique automatic tuning technology, even if the car and the parking position are deviated, the connection state between the coils changes, and automatic optimization can be performed. TDK envisions this system for wireless charging systems for a variety of large and small electric vehicles, as well as parking lots for a variety of ground infrastructure such as single-family homes, companies, restaurants, and stores.
At present, this system is still under development. The goal of TDK is to achieve 3KW (normal charging), 20KW (fast charging), and transmission efficiency of 80-90% (comprehensive efficiency). In terms of weight, the ground part is 10-20KG, the vehicle part is below 7KG; the charging distance is 10-20CM in the longitudinal direction, and the lateral deviation distance is less than 20CM.
In addition, TDK also envisages the planning of the future urban transportation system. The coils are buried in the space under the urban road ground. When the electric vehicle equipped with the receiving coil drives through this area, the charging is automatically triggered, so that the vehicle can "Complete wireless charging anytime, anywhere, inadvertently." Although this vision is expected, as with current charging pile charging, there are great challenges in terms of cost and universal construction.
Compared to the vision of electric vehicle wireless charging products, TDK's high-performance magnetic wireless charging technology for portable devices has been "close to the eyes", while achieving thin and high performance. At present, TDK uses thin plate flexible production technology to produce 5W (7V) products that support WPC Qi standard and impact resistance. Rx coils can provide customized specifications with thickness less than 0.8mm, and start to test thinner 0.57mm products. At this stage, the output current is at the level of 0.5A to 0.6A. In the future, the product with a thickness of 0.50mm will be further developed, and the output current will be maintained at the same level or above. The Tx coil is a flexible sheet that is light, thin and impact resistant and can be used in smartphones, digital cameras and other small mobile communication devices. At present, there are already several manufacturers around the world using TDK coil components for development, and relevant equipment may be available at the end of the year.
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