不间断电源(UPS)的可靠性设计

介绍了与UPS相关的可靠性概念，阐述了UPS的可靠性设计方法，可靠性指标的预计方法，这些内容也可作为其它电源产品设计时的参考。     

通信用单相不间断电源

随着计算机技术在通信领域中的广泛应用,各种通信手段几乎都离不开交流不间断电源。因为绝大部分微机及其外设,如打印机、显示器、调制解调器,都需要交流不间断地供电,以保证其连续可靠运行,不丢失数据。而且,在我国目前市电供应不充足的情况下,通信用的交流不间断电源应具备有较长支持时间。     

不间断电源主要厂商综述

本文是在大量调研的基础上,对适合卫通地球站不间断电源(中高档UPS)的国内外主要厂商概况及其产品特点作了综述。     

数字电视 可靠性试验设计

可靠性技术是提高产品质量的有效手段,具有广阔的应用前景。结合国内外可靠性试验技术对数字电视可靠性设计进行分析,分别介绍了可靠性的主要特征量、可靠性试验论证设计、贝叶斯验证试验、可靠性试验方案设计等方面,供相关实验室及检测人员参考。     

电源模块冗余热备份对可靠性的影响

温度是影响电子设备可靠性的重要因素。介绍了高频开关电源可靠性指标MTBF的计算方法,并分析了电源模块不同热备份数量对可靠性的影响。     

Failure analysis and improvement of 60 V power UMOSFET

In this paper, the failure modes of a 60 V power UMOSFET firstly have been discussed by analyzing the test data of the die, and our hypothesis is that the merger of the P-base regions under the trench leads to larger on-resistance and threshold voltage of 60 V UMOSFET. To further verify the hypothesis, the formula for the resistance of the drift region has been derived, and the simulating model of UMOSFET has been given with various mergers of the P-base regions. Then the simulation model has been corrected and the parameters of UMOSFET have been optimized. The re-design of 60 V UMOSFET has been taped out successfully, with its electric parameters totally meeting the requirements.     

RELVEC — a tool for control system reliability analysis

This article will present a computerized reliability analysis tool for large control systems. It will also show a new dynamic representation of system structure. It enables us to model the physical system only once for any number of control tasks. The algorithm for computing minimal cut sets for the control tasks has been developed and automated. The result is RELVEC, an interactive computer program that performs reliability/availability calculation, sensitivity analysis and critical component identification. It can handle two repair policies and common mode failures. Reconfiquring of the physical system or the control tasks is simple. RELVEC is becoming an everyday tool in control system reliability analysis at VTT.     

多媒体网络可靠性分析系统实现

基于MDI的视频质量分析模型,设计并实现了多媒体网络可靠性分析系统。首先,基于RTP/RTCP协议,实现了多媒体网络视频的实时远程传输及播放。然后,将多媒体网络的视频主观评价方法与客观评价方法相结合,提出了一种综合可靠性评价方法,相较于目前的网络可靠性分析方法,综合可靠性评价方法更加全面、可信。最后,通过实验给出了可靠性分析系统的结果。     

电子电气产品(设备)可靠性管理的研究与探讨

对于有可靠性要求的电子电气产品(设备),除了进行质量管理外,还必须进行可靠性管理,否则,产品的质量与可靠性是无法保证的.该文对电子电气产品(设备)系统可靠性管理的概念、内容、经济性、可靠性计划等诸方面进行了=比较全面而扼要的介绍,并深入地对以上内容进行了分析、探讨与研究,提出了一种清晰而简明的可靠性计划流程图.     

微型计算机可靠性验收试验探讨

可靠性试验是对产品的可靠性进行分析评价的一种手段。以微型计算机为研究对象,对其进行可靠性试验。试验采用定时截尾方法,分别采用点估计和区间估计的方法对平均无故障时间(MTBF)进行处理。通过对试验数据的分析,对微型计算机做出了较为客观的可靠性评估。     

The common thread for operational reliability and failure physics

Operational reliability and failure physics constitute the two extreme ends of the reliability engineering spectrum. One critical common thread that ties these two extremes together is stress. Studies that relate failures and failure mechanisms to operational reliability through this common thread have been near non-existent. This paper is an attempt to stimulate interest to fill the gap for electronic systems. Flaws exist in a piece of electronic equipment at the time of manufacture, and stresses exacerbate these flaws to the point of equipment failure. There are no random failures. Every failure is relatable to certain stresses. Estimated flaw population distributions and stress versus time-to-failure characteristics show that electronic equipment failure rates should decrease with respect to time of stress application, such as operating time. Failure rate expressions have been developed for selected stresses (i.e., high temperature, thermal cycling, electrical stresses and vibration) and are discussed in detail in the text. Much more work is still required in equating the quantitative measures of stress to failure rates and operational reliability. This paper will help in paving the way towards that end.     

移动通信电源系统可靠性提升策略

随着移动通信技术的快速发展,移动通信电源的功能也得到了不断的创新和完善,当前的移动通信电源系统已经具备了较好的安全性和稳定性,但随着移动通信用户要求的不断提高,和移动通信业务的快速发展,移动通信电源系统的可靠性得到了更为广泛的重视,如何通过技术手段或管理手段实现移动通信电源系统可靠性的提升,已经成为广大技术人员所关注的重要课题。本文在介绍移通信电源系统构成的基础上,对其可靠性的内涵进行了阐述,并就如何通过合理的技术与管理手段来提升移动通信电源系统可靠性提出了一些可行的方法,以供参考。