【作者】 陈晓静；

【导师】 刘仲娥；

【作者基本信息】 天津大学 ， 微电子学与固体电子学， 2005， 硕士

【摘要】 本论文重点研究适合于高压小容量(160V/1μF)低ESR液体钽电解电容器使用的工作电解质。目前,钽电容器正朝着高压、低ESR的方向发展。随着我国航天和通讯卫星事业的发展,新一代的研发工作正在全面展开。随着电源技术的革新,严格控制高次谐波对电流的污染已经成为全球电子设备设计者面临的重要问题。目前抑制高次谐波电流畸变有多种方法,但共同点是都采用有源滤波电路。一旦采用有源滤波电路,钽电容器将面临高压和高频性能的严峻考验。目前虽采用电容器进行串并联以满足其高压和低ESR的性能,但是这样会使得卫星系统的可靠性大幅下降,因此单芯子高压、低ESR液体钽电解电容器的研究是一个迫切的课题。本课题对工作电解质的闪火理论、电导率理论和钽电容器阴极界面的双电层理论等内容进行探索,分析了工作电解质中阴离子和有机物的种类及含量对钽电容器的闪火电压及ESR的影响,并研究了电解质中离子的导电问题,综合考虑提高电解质的电性能,研究了电解质在Ta2O5介质膜界面处的分布状态及作用。并在理论的指导下采用正交试验的方法,研制出160V/1μF液体钽电解电容器电解质配方。我们用新研制出的工作电解质装配成钽电容器老练后进行全项例行试验,其中包括2000小时160V、85℃及125℃高温负荷耐久性实验,全面考核电解质配方及钽电容器各项电性能,取得很好的结果。理论研究表明,工作电解质的闪火电压是影响钽电容器额定工作电压和可靠性的重要因素,而提高工作电解质的电导率将有效的降低钽电容器的ESR。提出提高钽电容器工作电解质闪火电压的方法应围绕着降低电解质的酸度和加入大分子有机物质的种类及含量等方面进行研究和探索。在满足提高电解质的闪火电压的前提下,提高工作电解质的电导率,以降低钽电容器的ESR,改善其综合电性能。钽电容器各项例行实验结果表明,用所研制的工作电解质和电解液装配成的相应规格的钽电容器各项参数符合合同规定的要求,是一次在理论指导下的成功实践。更多还原

【Abstract】 High voltage-low ESR working electrolyte used in 160V/1μF wet tantalum electrolyte capacitor is emphatically studied in the paper. Researching high voltage-low ESR wet tantalum capacitor is a developing trend. With growth in national spaceflight and communication satellite the new research is developing. It’s an important problem for global electronic device devisers to control high harmonic distortion pollution on electronic current. There are many kinds of ways to control high harmonic distortion, but the same way is to adopt active filter circuit. If active filter circuit is adopted, wet tantalum capacitor will face test of high voltage and high frequency. Though four capacitors which used by series-parallel connection can satisfy of high voltage-low ESR requirements, communication satellite system must descent. So this is a stringent subject to research single core high voltage-low ESR wet tantalum capacitor. This paper researches working electrolyte break-down voltage theory 、conductance theory and electrical double layer theory of cathode surface, analyzes anion and organic compound of working electrolyte effect on break-down voltage and ESR, researches ionic conductance and working electrolyte effect on Ta2O5 dielectric film. Working electrolyte is selected by orthonormal experiment and assembled 160V/1μF capacitors which make all experiments, including 2000 hours 160V、85℃ and 125℃ high temperature reliability experiments to examine all kinds of capacitor electrical performances. On the basis of these theories, working electrolyte break-down voltage chiefly affects on wet tantalum capacitor rated voltage and reliability, increasing working electrolyte conductance can effectively decrease capacitor ESR. Therefore, the way to increase break-down voltage is to decrease electrolyte acidity and add organic compound. Tantalum capacitors experimental results show that all electrical parameters of capacitors assembled by researching working electrolyte can reach contract requirements.更多还原