Wireless power transfer with electromagnetic waves … a wireless charging method using a nearby...
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TOKYO UNIVERSITY OF SCIENCE University Research Administration Center 1-3, Kagurazaka, Shinjuku-ku, Tokyo, 162-8601, Japan E-MAIL: [email protected] Wireless power transfer with electromagnetic waves for remote charge of wearable terminal Wireless power transfer with electromagnetic waves for remote charge of wearable terminal Electrical 2016.03 Purpose of Research Wearable communication terminals, which are powered by a small embedded battery, must be frequently charged. Currently, a wireless charging method using a nearby magnetic field is employed in some devices, but the usability of such devices is significantly limited during the charging. This problem can be solved by a long-range RF power transfer. However, this transfer method has poor efficiency. In addition, the transmitter in current terminal devices consumes a large amount of power and thus requires a large supply of power. The present study aims at solving these problems and develop- ing a chargerless wearable terminal that is powered by 24-hour wireless power transfer. In our research, we are building a wireless RF charging system which charges a wearable terminal several meters away with unprecedented high efficiency. In addition, all-digital envelope pulse width modulation technology is applied to the transmitter in the terminal, to easily and consistently achieve highly efficient communication. A millimeter or quasi-milli- meter wave band array antenna is used to improve the beam convergence for more efficient charging, so that lower power transmission is sufficient. Summary of Research Future Developments Continued development of high efficiency signal/power transmission using an easy, continuously usable, highly efficient all-digital transmitter and RF propagation control. ■ Associated System: Grants-in-Aid for Scientific Research C. ■ Intellectual Property: JP2014-204904 “Signal processing device and transmitter device” ■ Prototype: Not made ■ Sample: Not available Yohtaro UMEDA (Professor, Department of Electrical Engineering, Faculty of Science and Technology, Tokyo University of Science) A millimeter or quasi-millimeter wave band, shorter than that conventionally used, improves the beam convergence for more efficient power transfer. Using a digital instead of an analog transmitter lowers terminal power consumption and thus the amount of power to be charged. Design and control of a highly efficient multi-element plane array antenna for RF wireless charging. Reducing quantization noise of the digital transmitter. Radiation exposure and EMC assessments will be necessary. Collaboration on RF wireless charging systems using a multi-element plane array antenna, and on power-efficient digital transmitters. Comparison with Conventional or Competitive Technology • Remote wireless charging for wearable devices e.g. watch, bracelet, glasses, or sewn-in-clothes • Remote wireless charging of mobile phone, laptop, and other mobile devices Expected Applications Challenges in Implementation What We Expect from Companies • Highly efficient wireless charging and power-efficient communication, based on a millimeter or quasi-millimeter wave band and a multi-element array antenna • Simple, constant usability, high efficiency digital communi- cation with less energy consumption Points Power transmitter Antenna Antenna Mobile communication device Mobile communication device Power Data Channel information Channel information Antenna Fixed communication device Highly efficient beam convergence• DC/AC conversion Highly efficient digital transmitter Highly efficient AC/DC conversion Power Power DC/AC conversion (array antenna control) Rectifier circuit Battery Channel information DC power supply DC power supply Transmitter /receiver circuit Transmitter /receiver circuit
Transcript of Wireless power transfer with electromagnetic waves … a wireless charging method using a nearby...
TOKYO UNIVERSITY OF SCIENCE University Research Administration Center
1-3, Kagurazaka, Shinjuku-ku, Tokyo, 162-8601, Japan E-MAIL: [email protected]
Wireless power transfer with electromagnetic wavesfor remote charge of wearable terminalWireless power transfer with electromagnetic wavesfor remote charge of wearable terminalElectrical
2016.03
Purpose of Research
Wearable communication terminals, which are powered by a small embedded battery, must be frequently charged. Currently, a wireless charging method using a nearby magnetic field is employed in some devices, but the usability of such devices is significantly limited during the charging. This problem can be solved by a long-range RF power transfer. However, this transfer method has poor efficiency. In addition, the transmitter in current terminal devices consumes a large amount of power and thus requires a large supply of power. The present study aims at solving these problems and develop-ing a chargerless wearable terminal that is powered by 24-hour wireless power transfer.
In our research, we are building a wireless RF charging system which charges a wearable terminal several meters away with unprecedented high efficiency. In addition, all-digital envelope pulse width modulation technology is applied to the transmitter in the terminal, to easily and consistently achieve highly efficient communication. A millimeter or quasi-milli-meter wave band array antenna is used to improve the beam convergence for more efficient charging, so that lower power transmission is sufficient.
Summary of Research
Future Developments
Continued development of high efficiency signal/power transmission using an easy, continuously usable, highly efficient all-digital transmitter and RF propagation control.
■ Associated System: Grants-in-Aid for Scientific Research C.■ Intellectual Property: JP2014-204904 “Signal processing device
and transmitter device”■ Prototype: Not made■ Sample: Not available
Yohtaro UMEDA (Professor, Department of Electrical Engineering, Faculty of Science and Technology, Tokyo University of Science)
A millimeter or quasi-millimeter wave band, shorter than that conventionally used, improves the beam convergence for more efficient power transfer. Using a digital instead of an analog transmitter lowers terminal power consumption and thus the amount of power to be charged.
Design and control of a highly efficient multi-element plane array antenna for RF wireless charging. Reducing quantization noise of the digital transmitter. Radiation exposure and EMC assessments will be necessary.
Collaboration on RF wireless charging systems using a multi-element plane array antenna, and on power-efficient digital transmitters.
Comparison with Conventionalor Competitive Technology
• Remote wireless charging for wearable devices e.g. watch, bracelet, glasses, or sewn-in-clothes
• Remote wireless charging of mobile phone, laptop, and other mobile devices
Expected Applications
Challenges in Implementation
What We Expect from Companies
• Highly efficient wireless charging and power-efficient communication, based on a millimeter or quasi-millimeter wave band and a multi-element array antenna
• Simple, constant usability, high efficiency digital communi-cation with less energy consumption
Points
Powertransmitter
Antenna
Antenna Mobile communication deviceMobile communication device
Power
Data
Channel inform
ation
Channel information
Antenna
Fixed communicationdevice
Highly efficientbeam convergence•DC/AC conversion
Highly efficient digital transmitter
Highly efficient AC/DC conversion
Power
Power
DC/ACconversion
(array antennacontrol)
Rectifiercircuit Battery
Channelinformation
DCpowersupply
DCpowersupply
Transmitter/receiver
circuit
Transmitter/receiver
circuit
