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(xué)》2014年碩士論文　論文類型：學(xué)位論文

【摘要】：隨著科技的發(fā)展，植入式生物醫(yī)療電子設(shè)備的應(yīng)用日益普及，在生物研究和醫(yī)學(xué)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(shè)備，電源的長期、穩(wěn)定及安全供給是至關(guān)重要的問題。無線能量傳輸是當今比較熱門的研究領(lǐng)域，它能夠透過皮膚將能量源源不斷地供應(yīng)給體內(nèi)的植入式電子設(shè)備，因此被越來越多的植入式醫(yī)療電子系統(tǒng)采用。當前無線能量傳輸?shù)幕A(chǔ)是近場互感耦合理論，但傳統(tǒng)的互感耦合結(jié)構(gòu)存在傳輸效率隨距離增大迅速下降的缺點，所接收恢復(fù)的電源能量隨距離變化存在明顯波動，容易導(dǎo)致生物體體組織損傷，，且實現(xiàn)上大量的分立元件也增加了植入體內(nèi)的難度。 本文以線圈耦合結(jié)構(gòu)、體內(nèi)集成電路設(shè)計及能量反饋控制等角度為切入點，設(shè)計了一套具備無線供能自適應(yīng)調(diào)節(jié)機制的植入式三線圈能量傳輸系統(tǒng)。該系統(tǒng)由體外發(fā)射、三線圈耦合結(jié)構(gòu)、體內(nèi)能量收集與電源恢復(fù)電路組成，體外發(fā)射電路包括驅(qū)動電路、功率放大器、LSK解調(diào)模塊、MCU及數(shù)字可控電源，體內(nèi)能量收集與電源恢復(fù)電路主要包括低壓差線性穩(wěn)壓源、PWM以及LSK調(diào)制電路。 對于耦合結(jié)構(gòu)，本文在互感耦合理論的基礎(chǔ)上，分析影響其傳輸效率的關(guān)鍵因素，結(jié)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(jié)構(gòu)，并對其進行理論推導(dǎo)、仿真及實驗驗證。結(jié)果表明，三線圈耦合結(jié)構(gòu)在中遠距離時對傳輸效率有增強作用；克服了互感耦合結(jié)構(gòu)僅能在特定負載實現(xiàn)最優(yōu)效率的局限，實現(xiàn)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(fù)雜度為原則，采用Global Foundry0.18um CMOS工藝對體內(nèi)能量收集與電源恢復(fù)電路進行了版圖設(shè)計與驗證。流片測試結(jié)果表明，電源管理模塊實現(xiàn)了輸出電壓1.850V，輸出電流102.4mA，靜態(tài)電流68.43uA，負載調(diào)整率為2%，線性調(diào)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(jié)合PWM和LSK的反饋控制技術(shù)，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?shù)陌踩�，且能顯著提高近距離傳輸?shù)男�，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(xué)位授予單位】：華南理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TM724

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