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Battery-less ubiquitous wireless communications

Wireless communications are widely used at any time anywhere for the personal and mobile use. However, present wireless terminals need batteries to operate.

 

Wireless terminals without batteries are therefore strongly requested for ubiquitous wireless communications.

 

We developed a battery-less wireless terminal energized from capacitors charged by a hybrid power source with Piezo devices and solar cells. We also developed novel capacitor circuits which control charging and discharging the capacitors to effectively operate a Zigbee terminal.

 

We demonstrated that battery-less wireless ubiquitous communications were feasible and realized a transmission with the data volume of 496 Bytes/min or a transmission at the rate of 15 times/min with the battery-less wireless terminal.

Fig.1 Image of battery-less ubiquitous wireless communications.

Fig.2 Principle of battery-less wireless communications circuit.

Fig.3 Wireless terminal energized with Piezo/Solar cell.

     One of examples of this system is shown in Fig. 4. When infants go for a walk with a leader, they put on shoes with this battery-less hybrid terminal. The communications between the leader and them are automatically carried out without operations.

     Parents or teachers can easily grasp whether their infants are near them or not from ID information or the strength of received signals transmitted from infant terminals. 　It is also possible to detect infants who are getting separated from the group from the received signal level．

Fig.4 Application example　：Infant movement monitor system

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Publised papers：

  1. Y.Fukushima and M.Tanaka, Study on Battery-less Positional Information Interactive Communication System, IEICE nationa conf.，B-19-10,p633，2012.03

  2. Y.Fukushima and M.Tanaka, Study on Battery-less Positional Information Transmission System for Emergency Use, IEICE Comm. Society conf.，B-19-31,p449，2011.09

  3. K.Okubo and M.Tanaka, A Study on Ubiquitous Wireless Communication using Environmental Electromagnetic Wave Energy， IEICE nationa conf.，B-20-31,p626，2011.03

  4. Y.Fukushima and M.Tanaka, Battery-less Ubiquitous Wireless Communications with Piezo-Solar Hybrid Power Source, IEICE nationa conf.，B-20-32,p627，2011.03

  5. Hidenori Tobinai and Masayoshi Tanaka，Battery-less Ubiquitous Wireless Communications with Piezo-Solar Hybrid Power Source， IEICE nationa conf.　,B-20-2，2009

  6. Hidenori Tobinai and Masayoshi Tanaka，Piezo-Solar Hybrid Power Source for Ubiquitous Wireless Communications Terminals， IEICE Comm. Society conf.,B-20-11，2008

  7. Hidenori Tobinai and Masayoshi Tanaka，，Ubiquitous Wireless Communications System using Piezo-Solar Hybrid Power Driven Terminals， IEICE nationa conf.,B-2-10,2008

  8. Hidenori Tobinai and Masayoshi Tanaka，A Study on Ubiquitous Wireless Communications Application using Battery-less Terminals， IEICE Comm Society conf.，B-20-13, 2007

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