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Figure 1 Wireless power supply to terminals 10m away
KDDI and Ossia have jointly developed the "Cota" wireless power supply technology that can simultaneously supply power to multiple devices that are distributed indoors. The feature is that it can provide a maximum of 1W of power to multiple terminals at a distance of about 10m from the power supply device. At the "2016 International CES" held in January 2016, the two companies used Cotai's trial power supply devices to supply power to smart phones and smart locks.
Figure 2 Using Multiple Paths to Send Waves
Cota uses hundreds of antennas to transmit power through multiple paths. Although the radio waves in each path are weak, they can obtain large amounts of power at the receiving point.
KDDI and the American start-up company Ossia jointly developed the "Cota" wireless power supply technology that can simultaneously supply power to multiple devices that are distributed indoors. Theoretically, "a maximum of 1W of power can be supplied to a plurality of terminals located approximately 10m away from the power supply device" (narrator of Ossia). Power can be supplied even if the position of the power receiving terminal moves. In addition to mobile phones and wearable terminals, the two companies intend to apply the technology to IoT devices such as smart locks and thermostats.
At the "2016 International CES" held in January 2016, the two companies built a trial system using Cota and conducted a demonstration of the operation (Figure 1). This trial uses a cylindrical power supply device to supply power to smart phones and smart locks.
Using beacons
The general working principle of Cota is as follows. First, the beacon signal is sent 100 times to the power supply device every second by the power receiving terminal. The power transmission device receiving the beacon signal grasps the signal propagation characteristics with the power receiving terminal. The power supply device utilizes this propagation characteristic to transmit power waves of 2.4 GHz so that the power receiving terminal can receive the maximum power. The power antenna consists of hundreds of antennas. It should be easier to understand this principle as a power supply for beamforming.
According to reports, the reason for using a large number of antennas is to weaken the radio waves on each power receiving path to prevent adverse effects on the human body and other devices. Because it uses radio waves, it is called "electrical wave mode."
According to KDDI's narrator, a third-party organization, CKC Laboratories of the United States, conducted EMC verification of Cota. This technology has been confirmed to comply with the FCC (United States Federal Communications Commission) regulations.
KDDI invested in Ossia in January 2015 through the KDDI Open Innovation Fund, an investment fund jointly established by the company and Global Brain. According to reports, KDDI decided to invest in Ossia considering the convenience of improving the convenience of smartphones and IoT devices. Because it complies with the FCC regulations, "the first plan is to start marketing from the US market. The goal is to complete the final product before and after the CES in 2017. We intend to enter the Japanese market after achieving certain results in the United States. However, Japan needs to start with the development of relevant regulations. It takes time for us to start, and we plan to promote it solidly (KDDI narrator).
According to reports, in addition to KDDI, Intel Capital also invested in Ossia. The total "approximately $300,000" (Ossia narrator).
Different from existing wireless power supply applications
Wireless power supply technologies for smart phones, such as "Qi", have already been put into practical use. This kind of wireless power supply technology needs to make the distance between the power supply device and the power receiving terminal relatively close. Cota, on the other hand, features power from a remote location. However, Qi can supply more than 5W of electricity while Cota only has 1W. "Although it is technically possible to provide more electricity, only 1W of electricity is provided to comply with the regulations of the FCC and other regions" (KDDI narrator).
Therefore, the existing wireless power supply technology and Cota are used for different purposes. "For example, Qi and other technologies can be used for devices with high battery capacity, such as smart phones and tablet PCs, and Cota" (a narrator for KDDI) can be used for devices with small battery capacities, such as wearable terminals and IoT terminals.
Wireless power supply technologies for smart phones, such as "Qi", have already been put into practical use. This kind of wireless power supply technology needs to make the distance between the power supply device and the power receiving terminal relatively close. Cota, on the other hand, features power from a remote location. However, Qi can supply more than 5W of electricity while Cota only has 1W. "Although it is technically possible to provide more electricity, only 1W of electricity is provided to comply with the regulations of the FCC and other regions" (KDDI narrator).
Therefore, the existing wireless power supply technology and Cota are used for different purposes. "For example, Qi and other technologies can be used for devices with high battery capacity, such as smart phones and tablet PCs, and Cota" (a narrator for KDDI) can be used for devices with small battery capacities, such as wearable terminals and IoT terminals.
In the IoT terminal, there are products such as thermostats and smart locks that are driven using a No. 5 battery. Therefore, the 5th battery type power receiving terminal was trial-produced this time. It is equipped with a Cota antenna, a power receiving IC (receiver IC), and a secondary battery that temporarily stores power. According to reports, at present, up to 20 AA battery terminals can be supported, and maximum 1 W of power can be supplied to each terminal.
The prototype power supply is equipped with 16 main boards. Each main board is equipped with multiple antennas and power supply ICs (transmitters). The size of the prototype used to run the demonstration is currently "bin size" (Ossia's narrator), and "from May to June 2016, it will shrink to about half the size" (the narrator).
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