铌、钽电容器性能分析

钽铌属于同族元素 都是阀金属材料,其介电常数分别为27、41,都可以用来制作电解电容器。本文使用铌和钽2种材料分别制作电解电容器,并通过容量损耗测试仪、漏电流测试仪、电子扫描电镜等分析仪器对其和始性能、偏压性能、温度特性、寿命特性及其电介质层的微观特性进行检测分析。结果表明使用铌材料同样可以得到性能较好的电解电容器。     

片式钽电容器的研究现状与发展趋势

综述了近期国内外片式钽电容器的研究现状,并对今后钽电容器的技术发展进行了展望,指出提高电容量或在相同容量下缩小体积,以及改进性能,特别是降低ESR将是今后钽电容器发展的方向,铌电容器的问世将拓宽钽电容器的应用范围,并成为电容器的一个新品种.     

电容器用钽铌粉的研究进展

概括介绍了电容器用钽铌粉的研究进展,介绍了钽粉的3种钠还原制备方法的化学反应机理并进行了比较,同时还介绍了铌粉的制备方法,包括铝热还原法、电解还原法、蒸气还原法、钠还原法和金属热还原法;阐述了钽铌粉中杂质的测定方法以及有关钽铌粉的其它研究进展.     

深冲铌带工艺研究

深冲铌带主要应用于电解电容器行业,深冲铌带不但要满足内部晶粒尺寸的要求,而且要满足其后续加工的力学性能要求。深冲铌带要经过多次的拉伸,对铌带的生产工艺提出了很高的要求。本文研究了锻造、轧制、热处理3个关键工艺,确定了能够满足电解电容器行业用深冲铌带的生产加工工艺。     

钽铌电子材料新进展(Ⅰ)

代表中国钽铌工业整体水平的宁夏东方有色金属集团有限公司,近年来,研究了钽粉的微观结构,开发出降低杂质含量,改善物理性能等新技术以及Ta2O5钠还原制取高比容钽粉、TaCl5低温钠还原制取纳米级钽粉的新工艺方法;研制并生产出性能优良的、适用于钽电容器的高比容钽粉,同时也开发了高比容铌粉、一氧化铌粉的制造新技术,制得高性能的电容器级铌粉和一氧化铌粉,为铌电容器作为一种新型电容器产业参与竞争提供了优质的基础材料.     

钽铌电子材料新进展(Ⅱ)

代表中国钽铌工业整体水平的宁夏东方有色金属集团有限公司,近年来,研究了钽粉的微观结构,开发出降低杂质含量、改善物理性能等新技术以及钠还原Ta2O5制取高比容钽粉、低温钠TaCl5还原制取纳米级钽粉的新工艺方法;研制并生产出性能优良的、适用于钽电容器的高比容钽粉,同时也开发了高比容铌粉、一氧化铌粉的制造新技术,制得高性能的电容器级铌粉和一氧化铌粉,为铌电容器作为一种新型电容器产业参与竞争提供了优质的基础材料.     

电解液添加剂NaHCO3对多孔氮化铌纤维电化学性能的影响

超级电容器因其高效、快捷和循环稳定性好等因素成为应用广泛的新型储能装置,而电极材料是制约其发展的关键性问题.采用五氯化铌为原料,利用静电纺丝结合氨气还原氮化技术制备多孔氮化铌纤维,将其作为电极材料制备成Nb4 N5||Nb4 N5对称型扣式电容,并在Na2 SO4水系电解液中加入NaHCO3以提升电极材料的电化学性能.结果表明:制备的氮化铌纤维呈四方相,连续且表面呈现多孔化.多孔氮化铌电极存在双电层及赝电容储能两种机制,当添加15 mmol·dm-3的NaHCO3时,超级电容器比电容提高到187 F·g-1,其中,阻抗R1和扩散阻抗WR分别缩小为1.22Ω和1.47Ω,同时体系离子电导率提高,载流子浓度增大到6.58×1024 cm3,弛豫时间缩短至0.24 s.     

电容器在能量转换技术应用中的新进展

简要介绍了陶瓷电容器、聚合物薄膜电容器和电解电容器的性能特点,比较了这3种电容器在高压、高频能量转换技术中的应用.其中,重点分析了电解电容器在抑制开关电源所产生的噪声、高次谐波污染和提高在高能量电路中能量转换效率等方面的优势,并且提出减小电解电容器等效串联电阻(ESR)和低温阻抗可以改善滤波器的性能和可靠性.     

汽车仪表延时电路用电解电容器漏电流的测量

在新老桑塔纳仪表电路中用到十几种规格的电解电容器,不同的仪表电路对电解电容器的漏电流的大小要求也是不同的,在滤波电路中,电解电容器的漏电流K值为0.03,而用于延时电路的电解电容器的漏电流K值为0.003.在延时电路中如果电解电容器的漏电流稍有偏大,就会引起仪表报警时间延长,出现不合格产品,为此,对于桑塔纳仪表延时电路用的电解电容器的漏电流检测就显得非常重要.     

两种去极化剂对液体钽电容器电解质改性的研究

采用添加去极化剂的方法,对液体钽电解电容器工作电解质的配方进行改性,通过正交实验,研制出了一种新型的电解电容器电解质,用其装配成规格100V/100μF的液钽电容器,高低温性能测试结果表明,以CuS04为去极化剂,电容器的漏电流较小、容量变化小;以Fe2(S04)3作为去极化剂,电容器损耗较小,低温阻抗小,两种去极化剂都在一定程度上使电容器的高低温特性得到了改进.     

Active power decoupling with reduced converter stress for single-phase power conversion and interfacing

Single-phase DC–AC power electronic converters suffer from pulsating power at double the line frequency. The commonest practice to handle the issue is to provide a huge electrolytic capacitor for smoothening out the ripple. However, the electrolytic capacitors having short end of lifetime limit the overall lifetime of the converter. Another way of handling the ripple power is by active power decoupling (APD) using the storage devices and a set of semiconductor switches. Here, a novel topology has been proposed in implementing APD. The topology claims the benefit of (1) reduced stress on converter switches and (2) using smaller capacitance value, thus alleviating the use of electrolytic capacitor and in turn improving the lifetime of the converter. The circuit consists of a third leg, a storage capacitor and a storage inductor. The analysis and the simulation results are shown to prove the effectiveness of the topology.     

单相无电解电容永磁同步电机驱动系统控制方法研究

针对传统单相无电解电容电机驱动系统中直流母线电压波动较大而导致控制不稳的问题,提出一种单相无电解电容永磁同步电机驱动系统控制方法。通过对传统单相无电解电容电机驱动系统输入、输出功率进行分析,在q轴电流注入正弦分量,对输出功率进行控制,调节输入功率,达到改善输入电流波形的目的;通过设计一种积分比例控制器替代传统的比例积分控制器对母线电压进行调节,能够有效抑制母线电容充电时的电流、电压过冲。理论分析、仿真结果与试验结果均验证所提控制策略的有效性。     

铝电解电容器铝箔的研究现状和技术发展

简述了电解电容器用铝箔(原箔)的国内外生产技术研究现状及发展趋势.分析了电容器铝箔的特性要求,原料的制造技术,近年来铝电解电容器用铝箔研究取得的最新成果,电容器铝箔的技术难点、存在问题、未来技术发展趋势.指出了国产铝电解电容器用铝箔与国外同类产品在生产技术上存在的差距,探讨了相应的解决方案及发展前景.     

电子雷管用电子控制模块的抗冲击性能研究

针对小断面爆破时电子雷管内电子控制模块易受冲击作用失效的问题,通过钢桶冲击实验,对工作状态的电子控制模块及其核心部件分别进行抗冲击性能研究。结果表明,电子控制模块受冲击作用后,相比于物理结构损坏,易出现内部储能电容失电现象。电子雷管用储能电容受冲击失电是固有特性。储能电容受冲击失电性能由强到弱的顺序为：固态铝电解电容、电解铝电容、固态钽电容。储能电容受冲击失电量与电容类型、受冲击强度以及管壳内部防护结构的设计相关。设计的钢桶冲击实验方案能定性研究电子控制模块及内部元器件的抗冲击性能,可用于生产实践中对雷管结构设计和元器件进行筛选,从根本上控制产品质量。     

A METHOD FOR THE PREPARATION OF RAW POWDER FOR THE TANTALUM CAPACITOR: INFLUENCE OF PARTICLE SIZE AND BINDER CONTENT

Raw powder for use in the tantalum solid electrolytic capacitor was prepared by different processes, that is, the wet method (currently used conversion method) and the dry method (the proposed method). The properties of prepared powder from the dry method were compared with those of the wet method. The present report has focused on the relationship between the conditions of binder preparation and the properties of the prepared powder, such as the particle size distribution, angle of repose, and the tap density, respectively. Furthermore, the utility of the dry method was investigated.

Based on the results, it has been clarified that the properties of powder prepared by the dry method differ from those of the wet method. In the case of the dry method, it is suggested that the mechanism of preparation of the fine binder (PMMA powder) differs from that of the coarse binder. Furthermore, based on the experimental results, it has been suggested that the dry method could be used as the preparation method of the raw powder used in the tantalum solid electrolytic capacitor.     

用安捷伦4395A扩频测量铝电解电容器频率特性

频率特性是电容器重要的电气特性,它是设计电路的基础,可通过阻抗分析仪获得。研究采用Agilent4395A阻抗分析仪扩频测量铝电解电容器频率特性及其电气参数的方法具有实际意义。实测证明,用Agilent4395A扩频测量铝电解电容器频率特性是有条件的,测量结果是准确的。     

基于梳齿矫直法的电解电容引脚矫直技术

目的由于电解电容等元器件本身的特性,在实际生产物流和包装装箱过程中容易遇到冲击和碰撞导致引脚折弯,影响产品的包装与使用,因此设计一种全自动的电容引脚矫直机构代替人工矫直,以提高生产质量和效率。方法提出一种新型的引脚梳齿矫直方法,根据梳齿矫直机构工作特性以及弹塑性矫直理论,得到引脚矫直后的中性层曲率半径以及回弹角的影响因素,并通过其参数的仿真结果对矫直机构关键部件进行设计,最后得出完整的电解电容引脚矫直机构设计方案。结果根据弹塑性理论分析及其仿真结果可知,最合适的梳齿矫直参数为梳齿间隙1 mm、梳齿厚度6 mm、摩擦因数0.1。结论此电容引脚矫直机构的矫直合格率和矫直效率均达到了实际加工生产要求。     

Detection of capacitor electrolyte residues with FTIR in failure analysis

Detecting leakage from liquid aluminum electrolytic capacitors is not easy. Typically there is very little evidence of leakage because the electrolyte is volatile and leaves behind only trace residues. Liquid aluminum electrolytic capacitors are known to cause catastrophic failures where there is complete loss of functionality due to a short or open circuit. In the study presented in this paper, printed circuit board assemblies from a test and measurement system used in a clean room environment failed. Two units failed, causing burning in a particular area on the printed circuit board assembly. The failure area included several surface mount liquid aluminum electrolytic capacitors, and several others were mounted very close to the burnt region. A study was initiated to evaluate the cause of failure. Careful optical inspection revealed some residues on the outer side of the rubber seals of two of the electrolytic capacitors. Through using Fourier transform infrared analysis and a process of experimentation and analysis, it was determined that the residues were produced by liquid electrolyte that leaked out of the capacitor at some point in the field. The leaked electrolyte that came out of the capacitor was believed to be the cause of failure that led to the burning of the printed circuit board assembly.     

Effect of thermo-process on anodic capacitor foil manufacturing for AC etching

This investigation studies the anode foil of an aluminum electrolytic capacitor. The electrochemical behavior of high-purity aluminum foils with various thermal treatment parameters was examined. The static capacity increased with the temperature of homogenization treatment and hot rolling. The foil then has fine pits, which are uniformly distributed. Because of stabilizing treatment scattered dislocations and preferred orientation, the stabilized sample had better static capacity than the non-stabilized sample.