提高电源可靠性的最佳实践

　　提高电源可靠性的最佳实践

　　虽然乍看之下电源供应器可能不像微处理器或DSP那样富有魅力，但它们是电子系统必不可少的一部分，因为任何电源故障都会使系统瘫痪。它的性能差会危及给定产品的质量。因此，无论是直接供应失败和性能不佳的系统设计人员的关注。换言之，在任何系统中电源的可靠性是绝对关键的。

　　选择或建立可靠的电源需要全面了解影响产品可靠性的因素和应力。本文将探讨可靠性的含义和可靠性与失效率之间的关键差异，提出在一张白纸上崔“供电可靠性的考虑。”¹它还将讨论如何制造像崔是通过设计，提高可靠性和元件的选择、制造工艺。几个例子将演示如何供应商是在AC / DC和DC / DC转换器模块由公司制造和指定这些做法。

　　Reliability and failure

　　Before investigating the process involved in boosting the reliability of a power supply， it is important to first understand its definition and the difference between reliability and the failure rate. Per CUI’s white paper， reliability is the probability that the supply， operating under specified conditions， works properly for a given period of time. Failure rate is the percentage of units that fail in a given unit of time. As shown in Figure 1， it follows a “bathtub” curve and has been classified into three key phases by engineers， which include infant mortality， useful life， and wear-out. While infant mortality is the result of poor workmanship and inferior quality components， the second phase， which is useful life， keeps failure rate low and constant to keep the supply in proper operation for a longer time. In the wear-out phase， which is third and final， the supply fails when its components reach the end of their operating life.