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Designing Wireless Charger Circuit for Hearing Aids Using Radio Frequency Waves

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In this paper, an attempt has been made to produce a recipient system of wireless charge for a simple hearing aid so that electrical signal would be generated through detecting and receiving radio frequency waves (RF). The purpose of this design is to receive wireless charge for hearing aids and basically for any electronic device which is not required to a high energy for being setup. In this study, it has been demonstrated that as the amount of radio receiving energy increases, distance of receiver from antenna should be decreased; otherwise, either maximum amount of the receiving energy, or signal power density of the transmitter should be increased. Since it is impossible to be performed, it is decided to set up an energy receiving system constructed by rectenna and charge Circuit and to adjust their parameters to provide energy requirements for a device with low-power consumption. In this paper, different components of an energy receiving system from radio frequency band have been mentioned and a diagram block has been suggested. Subsequently, input impedance of designed antenna has been adjusted by provided relations. This impedance should be adjusted with the total impedance of regarded hearing aid Circuit by which the highest amount of received signal power is transferred to the battery of hearing aids. Received signal is converted to a dc voltage by rectifier diode. Finally, by applying a voltage regulator which has been designed using a common-collector amplifier not only the output voltage is kept constant, but the power is also strengthened. The battery of the hearing aids will be charged using the obtained power and voltage.
Cite this paper
Nejad, S. and Safdarian, N. (2014) Designing Wireless Charger Circuit for Hearing Aids Using Radio Frequency Waves. Journal of Biomedical Science and Engineering, 7, 948-962. doi: 10.4236/jbise.2014.711092. 
 

[1] Mickle, M.H., Capelli, C.C. and Swift, H. (2006) University of Pittsburghs Pmsburgh, Energy Harvesting Circuit. Patent No. US 7,084,605 B2.
[2] Toofan, S. (2009) Telecommunication Booklet. Zanjan University, Zanjan.
[3] Lo, E., Truong, H. and Elnatan, L. (2005) Alvin Mar, Ha Nguyen, Wireless Battery Charger. Final Report.
[4] Hagerty, J.A., Helmbrecht, F.B., McCalpin, W.H., Zane, R. and Popovic, Z.B. (2004) Recycling Ambient Microwave Energy with Broad-Band Rectenna Arrays. IEEE Transactions on Microwave Theory and Techniques, 52, 1014-1024.
[5] Rumsey, V.H. (1957) Frequency Independent Antennas. IRE National Convention Record, 5, 114-118.
[6] Yusef Zadeh, N., Jalali, M. and Pilehvari, M. (2006) Fractals and Their Application in Antenna Design, Student Conference on Electrical Engineering, Iran.
[7] Mushiake, Y. (1992) Self-Complementary Antennas. IEEE Transactions on Antennas and Propagation, 34, 23-29.
http://dx.doi.org/10.1109/74.180638
[8] Dyson, J.D. (1959) The Equiangular Spiral Antenna. IRE Transactions on Antennas and Propagation, 7, 181-187.
http://dx.doi.org/10.1109/TAP.1959.1144653
[9] Thaysen, J., Jakobsen, K.B. and Appel-Hansen, J. (2006) A Logarithmic Spiral Antenna for 0.4 to 3.8 GHz. Applied Microwave & Wireless, 13, 32-45.
[10] Samooti, S.M., Reza, Z.Y., Nasiri Savadkuhi, SH. and Shabani, M. (2013) Telecommunication and Radio Principles. Textbook Publishing Company of Iran, Tehran.
[11] Ali, M.E.S. (2001) Electronic 1 and 2 Books. 5th Edition, Publication of Shykhbhayy.
[12] Rezazadeh, Y., Nasri, GH.H. and Nazarian, F. (2010) Public Electronic. Textbook Publishing Company of Iran, Tehran.
[13] Khanbaba, S. (2012) Hearing Aid. Final Report, Islamic Azad University of Dezful, Dezful.                                          eww141007lx
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