بررسي و بهبود مدارات انتقال توان و داده براي لينك القايي وراجلدي ايمپلنت حلزوني گوش

چكيده انگليسي :

Degree Master of Science in Electrical Engineering Electronics Title Analysis and Improvement of Power and Data Transfer Circuits for Transcutaneous Inductive Link of Cochlear Implants Author Soheil Hor Supervisor Dr Hosein Farzanehfard Department Electrical and Computer Engineering Date 2013 09 01 Language Persian Abstract The cochlear implant is the most successful neural implant that has been commercialized ever since Although one of the most limiting challenges in design of neural implants is efficient data and power transmission the research trend has been mostly on improvement of signal processing algorithms and use of advanced biomaterials So there is a tremendous need in improvement of data and power transmission link of cochlear implants The conventional method used in cochlear implants for power and data transmission is use of inductive transcutaneous power and data link This method is based on using two loosely coupled coils that are placed in two sides of the skin and transmit data and power by electromagnetic coupling Because of the limitation of the human body the frequency and power of the transmitted signal should be limited to a certain range so the living tissue not be harmed Because the practical design values are limited to frequency range of hundreds of kilo hertz to a few mega hertz and the power rang of hundreds of miliwatts to a few watts use of conventional RF amplifiers or conventional switching amplifiers may not be efficient So a new circuit should be designed to meet this specific frequency and power range requirements The design goal is to transmit power with maximum efficiency and with minimum sensitivity to the non idealities of the link and simultaneously transmit data with maximum bandwidth and minimum disturbance and use minimum number of extra circuits in minimum of size This thesis focuses on design of data and power transmission circuits of the transcutaneous link in two sections In the first section an introduction to the general structure of cochlear implants and the transcutaneous power and data transmission link is discussed Then the available circuits that can be use for data and power transmission in the inductive link are briefly discussed and finally the design of the Class E power amplifier as the most popular converter used in inductive link of cochlear implants is discussed in detail In the final part of this section an improved converter is proposed and is compared to the most popular conventional converter Class E by computer simulations The proposed converter has remarkable advantages over the Class E converter in terms of efficient power and data transmission with the lowest sensitivity to the unwanted changes of the inductive link In the end of this section practical test results of a prototype of the proposed converter is presented In the second section available options that can be used for receiving the power and data and the evolution path of internal power regulation circuits in cochlear implants are introduced briefly and based of one of recent high efficiency switching voltage regulators used in cochlear implants a new converter is proposed The proposed converter has remarkable advantage over the conventional circuits in term of efficiency voltage gain and converter size In end of this section practical test results of a lab prototype of the proposed converter is presented Keywords 1 Switching power supplies 2 Transcutaneous inductive link 3 High frequency switching power supplies 4 High step up converters and regulators 5 Soft switching converters 6 Data and power transmission circuits PDF created with pdfFactory trial version www pdffactory com

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بررسي و بهبود مدارات انتقال توان و داده براي لينك القايي وراجلدي ايمپلنت حلزوني گوش

منابع تغذيه سوئيچينگ , تقويت كننده هاي قدرت سوئيچينگ فركانس بالا , مبدل هاي تقويت كننده هاي ولتاژ , مبدل هاي سوئيچينگ نرم