Given threshold-based numerical control finished product circuit board performance degradation evaluation method

A technology that accelerates performance degradation and circuit board performance. It is used in the field of performance degradation evaluation of CNC finished circuit boards. It can solve problems such as life and reliability that are difficult to effectively evaluate, faults, product failures, etc., to save test time and cost, and to quickly evaluate results. , cost saving effect

Active Publication Date: 2013-04-17
HUAZHONG UNIV OF SCI & TECH
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Problems solved by technology

However, for printed circuit boards with long life and high reliability, within a certain test period, even through accelerated tests, only relatively few or no failures can be observed.
Therefore, there is a problem that it is difficult to effectively evaluate its life and re

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  • Given threshold-based numerical control finished product circuit board performance degradation evaluation method
  • Given threshold-based numerical control finished product circuit board performance degradation evaluation method
  • Given threshold-based numerical control finished product circuit board performance degradation evaluation method

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[0026] In order to make the objectives, technical solutions, and advantages of the present invention clearer, the following further describes the present invention in detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, but not to limit the present invention.

[0027] Printed circuit boards are the main components of numerical control equipment. With the development trend of numerical control technology becoming more complicated and intelligent, the functional circuits on CNC finished boards are becoming more and more complicated, the circuit density is getting more and more dense, and the more layers, the more layers. Coupled with the high-speed load working conditions of the numerical control equipment and the environmental factors of high temperature and high humidity, the conductive anode filament phenomenon CAF (Conductive Anodic Filament) of the...

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Abstract

The invention discloses a given threshold-based numerical control finished product circuit board performance degradation evaluation method which comprises the steps of: (a) selecting an evaluation template to implement an acceleration performance degradation test, and measuring surface insulation resistance value; (b) executing test data fitting, and establishing an acceleration performance degradation model of a test template; (c) calculating the pseudo failure life of the test template based on the failure threshold by combining the acceleration performance degradation model; (d) selecting a life distribution model of the test template, and calculating the parameters of the life distribution model by utilizing a pseudo failure life fitting test; and (e) confirming the life distribution probability density function of the test template, and calculating the average lifetime of the test template to complete the performance degradation evaluation process of a circuit board. The given threshold-based numerical control finished product circuit board performance degradation evaluation method overcomes the defects of failure data in the existing reliability evaluation technology, saves the time and the cost used for evaluating the reliability, and is beneficial to the maintenance plan and optimization of a system.

Description

technical field [0001] The invention belongs to the technical field of printed circuit boards, and more specifically relates to a performance degradation evaluation method of a numerically controlled finished circuit board based on a given threshold. Background technique [0002] Printed circuit boards are the main components of electronic products. They are widely used in various fields such as aviation, numerical control, computers, and automation instruments. Their quality performance and stability are crucial to the products. In order to evaluate and examine its life and reliability indicators, accelerated test methods must be used. Accelerated life test is to promote the failure of the sample in a short period of time under stress conditions exceeding the environmental conditions of use, so as to predict the reliability in the normal use environment, but do not change the failure mechanism of the test sample. However, for printed circuit boards with long life and high ...

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Application Information

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IPC IPC(8): G01R31/28
Inventor 金健解传宁宋宝张航军叶伯生凌文锋唐小琦陈吉红
Owner HUAZHONG UNIV OF SCI & TECH
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