It can be cut part, and the remaining fragments continue to work.
Japanese engineers have created a wireless charging that can be cut in a convenient form and attach to everyday objects. Thanks to the use of many coils and the unusual circuit wiring, the elements of the charge that remained after the cut continue to operate, informs Rus.Media.
Wireless charging is a device with one or more inductors, which are due to vynikajuca they have the electromagnetic field can excite the current in the inductor. This technology is widely used in smartphones, as well as begins to be used in larger devices such as laptops and even cars. Existing wireless charging are devices strictly defined form that is not always convenient to use and difficult to adapt to your needs.
Joshua Kawahara (Kawahara Yoshihiro) and his colleagues from the University of Tokyo has developed the technology to create thin and flexible wireless chargers, which can be cut into the desired shape and to incorporate into other objects, including clothing or furniture. With the development of technology engineers had to develop such a scheme, the device generally worked, even if part of it is cut or damaged. For this they used a H-shaped tree wiring Board. Board is an array of beslow separate coils, connected with the center, which houses the Central electrodes. While conductive paths arranged in a tree structure. Thanks to this scheme at the damage of one or more tracks or the coils stop working or only those items, or the next, but most coils will still work:
However, a large number of inductors, means that this coil can generate mutual interference and significantly reduce the charging efficiency. For this, the engineers used division multiplexing time. This method also works only part of the coils located at a distance from each other, and a set of coils changes periodically:
Each coil nine inches in length and width, and also conducting paths for energy transmission are also equipped with Hall sensors for detection of devices that support wireless charging. The entire Board consists of 16 coils and has a size of 40 centimeters. In addition, the charging control module is required, which the engineers gathered on the basis of Arduino.
The developers have demonstrated the applicability of their technology with several prototypes. In particular, they created a clever bag for products with an integrated flexible wireless charging. Placing a smartphone in the side pocket of this bag, the user can charge it on the road. They also created a smart jacket, a table, a bowl and Mat in the form of a feline head, with built-in wireless charging. The developers have measured the effectiveness of a single coil at various operating conditions. The power of the coil amounted to seven watts, but the transmission of direct current, the efficiency of energy transfer was 91%, and the transfer of alternating current is even less – 60% (4,2 wool on the receiving coil).