Study On Wireless Transmission Device Of Power For Subretinal Prosthesis

Artificial visual functions recovery has attracted the most attention in the field of artificial organs. Our project is under the support of NSFC(No. 30470469),our design is based on the subretinal prosthesis。In order to make sure the steady of stimulator unit in the long term,beside adopt low-power design,we need additional power supply。This dissertation will pilot study and explore toward the power supply for subretinal artificial retina.Firstly,the concept of wireless transmission technology the sort and the key problem is analysis in detail. The situation of study situation in this field is summarized and the research direction is pointed. Meanwhile, the environments of retina physiology and model of retina cell is pilot study. At last, summarizing and analyzing the theory and experiment base of the retina wireless power transmission.Wireless power transmission is based on Faraday electromagnetism induce law. The working principle of power transmission: Class E power magnifier is used in the process of changing the DC into radio signal. The radio signal is converted to the RF energy by the resonant loop. Then the signal will be commuted, filtered and regulated. At last it meets the demand of stimulator unit.In the third part, the primary part, second part and coils is design individually. After considering the power transmission efficiency and analyzing theelectromagnetism effect to the human body. We choose the work frequency is 1MHz. At last , the computer software was used to simulator circuit. In order to enhance transmission efficiency, the optimization parameter is acquired by Pspice simulation. The result present a validity design for the transmission system;The out put of primary part is steady and reliable which can satisfy the technology demand of RF inductive transmission;The out power on the load can arrive 200 mW at 5V voltage which can meet the stimulator unit.The main work in this disseration is:①the theory analyze according to the requirement of retina environment;②The improved half-wave rectifier is presented by employing MOS technology based on the deficiency of conventionalarchitecture. By using the character of parasitic capacitor, the charget ransfer can elevate the rectifying efficiency.