本文選題：無線能量傳輸　切入點：三線圈耦合　出處：《華南理工大學》2014年碩士論文　論文類型：學位論文

【摘要】：隨著科技的發(fā)展，植入式生物醫(yī)療電子設備的應用日益普及，在生物研究和醫(yī)學診斷等方面發(fā)揮著越來越重要的作用。對于實際的植入式電子設備，電源的長期、穩(wěn)定及安全供給是至關重要的問題。無線能量傳輸是當今比較熱門的研究領域，它能夠透過皮膚將能量源源不斷地供應給體內的植入式電子設備，因此被越來越多的植入式醫(yī)療電子系統采用。當前無線能量傳輸的基礎是近場互感耦合理論，但傳統的互感耦合結構存在傳輸效率隨距離增大迅速下降的缺點，所接收恢復的電源能量隨距離變化存在明顯波動，容易導致生物體體組織損傷，，且實現上大量的分立元件也增加了植入體內的難度。 本文以線圈耦合結構、體內集成電路設計及能量反饋控制等角度為切入點，設計了一套具備無線供能自適應調節(jié)機制的植入式三線圈能量傳輸系統。該系統由體外發(fā)射、三線圈耦合結構、體內能量收集與電源恢復電路組成，體外發(fā)射電路包括驅動電路、功率放大器、LSK解調模塊、MCU及數字可控電源，體內能量收集與電源恢復電路主要包括低壓差線性穩(wěn)壓源、PWM以及LSK調制電路。 對于耦合結構，本文在互感耦合理論的基礎上，分析影響其傳輸效率的關鍵因素，結合強磁耦合利用高Q值共振器提高遠距離傳輸效率的思路，提出了一種三線圈耦合結構，并對其進行理論推導、仿真及實驗驗證。結果表明，三線圈耦合結構在中遠距離時對傳輸效率有增強作用；克服了互感耦合結構僅能在特定負載實現最優(yōu)效率的局限，實現了大負載范圍的高效能量傳輸。 同時本文以低功耗、小面積及低復雜度為原則，采用Global Foundry0.18um CMOS工藝對體內能量收集與電源恢復電路進行了版圖設計與驗證。流片測試結果表明，電源管理模塊實現了輸出電壓1.850V，輸出電流102.4mA，靜態(tài)電流68.43uA，負載調整率為2%，線性調整率為0.9%，電源抑制比在直流時小于-80dB，1MHz時小于-35dB。 最后本文提出了一種結合PWM和LSK的反饋控制技術，實驗表明，該反饋可有效控制能量的傳輸，在距離變化時保證接收能量的穩(wěn)定，提高能量傳輸的安全性，且能顯著提高近距離傳輸的效率，在距離小于2mm時可提升5.7倍。
[Abstract]:With the development of science and technology, the application of implantable biomedical electronic devices is becoming more and more popular, which plays an increasingly important role in biological research and medical diagnosis. Stability and safe supply are critical issues. Wireless energy transmission is a hot area of research today, and it can continuously supply energy through the skin to implanted electronic devices in the body. Therefore, more and more implantable medical electronic systems are adopted. At present, the basis of wireless energy transmission is the near-field mutual inductance coupling theory, but the traditional mutual inductance coupling structure has the shortcoming that the transmission efficiency decreases rapidly with the increase of distance. The energy of the received and restored power source fluctuates obviously with the change of distance, which can easily lead to the damage of organism tissue, and a large number of discrete elements also increase the difficulty of implanting in vivo. In this paper, an implantable three-coil energy transmission system with adaptive regulation mechanism of wireless power supply is designed from the aspects of coil coupling structure, in vivo integrated circuit design and energy feedback control, etc. The system is launched in vitro. Three coils coupling structure, in vivo energy collection and power supply recovery circuit, external transmission circuit includes driving circuit, power amplifier LSK demodulation module MCU and digital controllable power supply. In vivo energy collection and power recovery circuits mainly include low voltage difference linear voltage regulator PWM and LSK modulation circuit. On the basis of the theory of mutual inductance coupling, this paper analyzes the key factors that affect the transmission efficiency of coupling structure, and proposes a three-coil coupling structure based on the idea of using high Q value resonator in strong magnetic coupling to improve the transmission efficiency of long distance. The theoretical derivation, simulation and experimental results show that the three-coil coupling structure can enhance the transmission efficiency at medium and long distance, and overcome the limitation that the mutual inductance coupling structure can only achieve the optimal efficiency under a specific load. High efficiency energy transmission is realized in large load range. At the same time, based on the principle of low power consumption, small area and low complexity, the layout design and verification of energy collection and power recovery circuit in vivo are carried out by using Global Foundry0.18um CMOS technology. The power management module realizes the output voltage of 1.850V, the output current of 102.4 Ma, the static current of 68.43 uA, the load adjustment rate of 2, the linear adjustment rate of 0.9 and the power rejection ratio of less than -80 dB ~ (-1 MHz) when DC is less than -35 dB. Finally, a feedback control technique combining PWM and LSK is proposed. The experimental results show that the feedback can effectively control the transmission of energy, ensure the stability of the received energy and improve the security of energy transmission when the distance varies. The efficiency of short distance transmission can be improved by 5.7 times when the distance is less than 2 mm.
【學位授予單位】：華南理工大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TM724

【參考文獻】

相關期刊論文 前7條

1 趙春宇,陳大躍,高立明,丁洪,謝國權,朱成剛;植入式電動智能掌指關節(jié)的研究[J];高技術通訊;1999年12期

2 趙玉娟;顏國正;劉華;昝鵬;;人工肛門括約肌的經皮能量傳輸技術研究[J];測控技術;2008年04期

3 辛文輝;顏國正;王文興;;膠囊內窺鏡無線供能模塊的研制[J];上海交通大學學報;2010年08期

4 王保華;體內外信息雙向傳輸的效率與可靠性[J];上海生物醫(yī)學工程;1995年01期

5 王保華;植入式電子系統中射頻線圈的失配分析[J];上海生物醫(yī)學工程;1996年01期

6 劉修泉;張煒;吳彥華;黃平;;體內微機電無線能量傳輸系統的仿真分析[J];系統仿真學報;2008年08期

7 辛文輝;顏國正;王文興;賈智偉;;膠囊內窺鏡能量接收穩(wěn)定性研究[J];儀器儀表學報;2009年11期

相關博士學位論文 前1條

1 陽天亮;經皮能量傳輸系統閉環(huán)控制方法的研究[D];上海交通大學;2011年

本文編號：1592257