【作者】 高晓琳；

【导师】 杨庆新； 陈海燕；

【作者基本信息】 河北工业大学 ， 电工理论与新技术， 2007， 硕士

【摘要】 随着人工心脏向小型化、耐用性强及低阻力的发展,使得其有可能像人工心脏起搏器一样在将来得以广泛应用。最初的电动人工心脏固定在患者腹腔内,通过从胸部引出的导线与体外的电池组相连,极易造成致命感染。采用无接触传能技术的经皮传能系统(Transcutaneous Energy Transmission System以下简称TETS)为人工心脏供电,没有导线穿透皮肤,既可以防止感染引起的并发症,又大大改善了做移植手术病人的生活质量。TETS的传输效率由三部分组成:从直流到高频交流的逆变效率;从次级输出端到负载端的变换效率;感应耦合环节的功率传输效率。其中系统无接触变压器部分的设计和优化是提高系统效率的关键。本文以TETS无接触变压器为研究对象,对系统的主要特点、工作原理、发展现状、研究难点等进行了研究。通过分析TETS变压器的互感模型,建立了TETS的系统等效电路模型。应用有限元软件分析了影响变压器耦合的主要因素,主要包括有无铁芯,以及线圈的形状、结构、尺寸。本文重点研究了一种耦合系数较高、体积小、适于植入体内的线圈结构,并且分析了线圈尺寸对系统耦合效率的影响,为优化线圈结构提供了依据,从而进一步提高了系统的传输效率。本文比较分析了变换器的无功补偿方法,并从输出阻抗的角度对TETS等效电路及系统的无功补偿进行分析。仿真结果表明当输出一定功率时,对系统进行无功补偿能减小对系统供电电源的要求。最后设计了一种左心辅助装置(Left Ventricular Assist Device简称LVAD)的经皮传能变压器,并对其二次整流电路部分进行了仿真。更多还原

【Abstract】 With the development on miniaturization、durability and low-resistance of the artificial heart, it might be used as widely as the artificial pacemaker. The original electric artificial heart is connected with the battery by the wires which will penetrate the skin. It has highly fatal infection. Using Transcutaneous Energy Transmission System (TETS) drive the artificial heart, there aren’t any wire penetrates into the skin, which can prevent infection complications. This way is more comfortable and has greatly improved the life quality of the patients.In order to improve the efficiency of energy transfer system, the design and optimization of the contactless transformer are the keys to improve the system efficiency. In this paper, the contactless transformer of TETS has been researched. The working principle of the system, the development of the TETS and the difficulties on research are explained. By analyzing the mutual inductance model of TETS transformer, the equivalent circuit model of TETS is established.The factors affecting the transformer coupling are analyzed by the finite element software. This paper introduces a core type transformer which is suitable for in vivo implantation. The factors which affect the coupling character of this system have been studied. Optimization of this coil structure provides a basis to improve the efficiency of the transmission system. A variety of reactive compensation methods have been introduced. In view of the specific circumstances of TETS, the equivalent circuit has been analyzed, and the output impedance is considered for the system reactive power compensation methods. The simulation results show that when the power output is certain, the system reactive power compensation can be used to reduce the system electric power requirements.In the end, a transformer and its rectifier circuit for Left Ventricular Assist Device (LVAD) have been designed and simulated.更多还原