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介绍电容的物理意义及电容器的构造,分类,特性参数,电气功能,综述液态铝电解电容器的结构性能特点及其面临的机遇和挑战,回顾铝电解电容器的发展历程,并展望其发展趋势。小型片式化的固态铝电解电容器具有优异的电气特性,必将是未来产品和应用的主角。 相似文献
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介绍电容的物理意义及电容器的构造,分类,特性参数,电气功能;综述液态铝电解电容器的结构性能特点及其面临的机遇和挑战,回顾铝电解电容器的发展历程,并展望其发展趋势,小型片式化的固态铝电解电容器具有优异的电气特性,必将是未来产品和应用的主角。 相似文献
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分析了各种特殊场合应用的铝电解电容器的不同作用,提出了相应的性能要求;同时,针对铝电解电容器设计制造过程中的要点,如铝箔、电解纸、电解液等选材原则,以及应采用的工艺和结构等等,作了较为详细的阐述。对铝电解电容器生产单位能更好地满足日新月异的电子技术变化要求提出了相应的解决办法。 相似文献
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随着电子整机和日用电器性能的提高,要求铝电解电容器要有较大的发展,近年来出现了多种新型铝电解电容器。本文扼要地论述这些新型电容器的设计原理。 相似文献
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在各种类型的电容器中,铝电解电容以其高电压、高容量以及低成本的特性得到了广泛的应用,无论是在电脑主板、液晶电视、机顶盒、DVD等消费应用,还是在通信设备、汽车电子、航空航天等行业应用,我们都能看见大量的铝电解电容器得到采用。 相似文献
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本文重点阐述了铝电解电容器设计计算中确定阴极箔长度附加部分采用试凑法带来的不足,通过比较分析推荐出具有普遍意义的计算公式。 相似文献
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本文从电解电容器的原材料、结构、设计和生产工艺等方面,着重叙述了音响用铝电解电容器的音质特性、暂态响应特性及其影响因素,并提出了改进意见。 相似文献
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铝电解电容顺的片式化关系着SMT技术的进程。片式铝电解电容器设计着眼点在耐焊接热,结构紧凑,性能稳定及长寿命方面。工艺质量控制在铆接,包卷,浸渍,装配,装底座方面。标准,国产化材料,工艺技术是国内生产片式铝是解电容器尚待解决的问题。 相似文献
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The electrolytic capacitor (Al-Cap) is widely considered as one of the reliability-critical components in LED driver applications. A realistic lifetime prediction of Al-Caps would be beneficial to the sizing of capacitors to fulfill a specified design lifetime. This paper investigates the impact of electrolytic capacitor parameter shifts on the LED driver performance and the capacitor reliability. The operation condition, degradation, and tolerance are considered as the main reasons that deviate the parameters from nominal values. A method to model the degradation of Al-Cap parameter is introduced as well. In the case study of a flyback LED driver for street lighting, the contribution of parameter shifts to the electrical performance of LED drivers and Al-Cap core temperature is evaluated based on both theoretical analysis and simulation. A quantitative comparison of the estimated lifetime of Al-Cap in the LED driver is given with and without the consideration of capacitor parameter shifts within the service life. The proposed method enables a more realistic way for electrolytic capacitor lifetime prediction in LED drivers, which would otherwise have the risk of overestimation. 相似文献
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Passive filter design using genetic algorithms 总被引:1,自引:0,他引:1
Yaow-Ming Chen 《Industrial Electronics, IEEE Transactions on》2003,50(1):202-207
The objective of this paper is to propose a new approach for designing a passive LC filter of the full-bridge rectifier by using genetic algorithms (GAs). The performance of the cost-effective passive LC filter for a constant load depends on the appropriate inductor and capacitor selection. Several design methods are reviewed and a novel design methodology using GAs is proposed in this paper. By using the proposed GA program, designer can quickly find appropriate parameter values to meet the desired circuit performance. Experimental results show that an appropriate combination of the inductor and capacitor selected by the proposed GA program can meet the desired power quality requirement. Different cases of design examples are shown in this paper to verify the performance of the proposed design methodology. 相似文献
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IEC标准将无源滤波器和并联电容器的应用搁在一起讨论,因为滤波器无沦失谐或调谐也都有补偿功能。本文介绍了滤波器的相对电抗值X%的选择,以及X%和滤波器外部性能的关系,并深入讨论了如何根据不同场合分别选用并联电容器、失谐滤波器或调谐滤波器的问题,也再次讨论了滤波器参数和工程设计的关系,最后讨论了如何协调谐波和无功的补偿功能。 相似文献
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Hee‐Bok Kang Suk‐Kyoung Hong Yong‐Wook Song Man Young Sung Bokgil Choi Jinyong Chung Jong‐Wook Lee 《ETRI Journal》2008,30(6):826-832
The metal‐ferroelectric‐metal (MFM) capacitor in the ferroelectric random access memory (FeRAM) embedded RFID chip is used in both the memory cell region and the peripheral analog and digital circuit area for capacitance parameter control. The capacitance value of the MFM capacitor is about 30 times larger than that of conventional capacitors, such as the poly‐insulator‐poly (PIP) capacitor and the metal‐insulator‐metal (MIM) capacitor. An MFM capacitor directly stacked over the analog and memory circuit region can share the layout area with the circuit region; thus, the chip size can be reduced by about 60%. The energy transformation efficiency using the MFM scheme is higher than that of the PIP scheme in RFID chips. The radio frequency operational signal properties using circuits with MFM capacitors are almost the same as or better than with PIP, MIM, and MOS capacitors. For the default value specification requirement, the default set cell is designed with an additional dummy cell. 相似文献
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根据文章(上)工作状态分析和IGBT栅极驱动特性的要求,文中对160个IGBT串联开关调制器的驱动电路进行了深入的论述、分析。全面系统地介绍了设定脉宽的电流互感器型驱动器的工程设计方法,给出了实用电路参数的计算公式,提出在密勒电容Cm影响下驱动器工作状态的设计原则,归纳出驱动电压UGE前沿τr分段设计的2种计算方法。最后介绍了2种双极性脉冲驱动器的实用电路、RC加速网络的参数设计方法。 相似文献