Switching Power Adapters With Long Service Life

Analysis of the service life of switching power adapters

When the working condition of the components does not exceed the reference index on the specification provided by the supplier, then the long life working of the switching power adapter can be realized. The derating of components can provide product reliability. A significant reason why the actual life does not reach the rated life is that the operating condition of the components is in the worst condition. The worst condition is the product in a variety of normal or abnormal operating conditions (including changes in dynamic load size, short-circuit conditions, working in high and low temperature environments, the lowest and highest input operating voltage, in the case of cold startup, shutdown, etc.).

Switching power adapter in the process of use, with the changes in working time, divided into initial failure, occasional failure, wear and tear failure of the three stages, the corresponding causes of failure are also different.

Initial failure of power supply products: switching power adapter in the initial period of use, usually within 30 days of the failure, with the passage of time, the product work is stable, the failure rate gradually become less. The main cause is due to potential defects, which requires perfect design, as well as component screening and other measures to prevent failure. Switching power adapter production process has aging test, but the time is only 2~4 hours, a very small number of components of potential defects or screening out.

Episodic failure of power supply products: after the initial fault elimination, it will enter the stage of episodic failure. It is mainly caused by product drop, lightning and other unexpected situations, which has nothing to do with the working time, and basically can maintain a certain failure rate. Our goal is to prevent occasional defects in the production process, has been to control the use of excessive fluctuations in the environment, making occasional failures close to zero.

Power supply product wear failure: after the incidental failure stage, the failure will arise again with the passage of working time. At this time, the failure is mainly due to product loss, wear and tear caused by, can also be understood as part of the components of the life has reached the limit.

According to the reliability requirements of the product, the cost requirements of the design, maturity, safety, after-sales maintenance costs, the ease of assembly and other requirements to determine the level of its derating. Military standard GBJ/Z35-93 recommended the following three levels of derating:

1. Grade I, which is the largest derating, the use of components to improve the reliability of the largest role. Apply to the following situations: the realization of the product will bring serious damage to the application system or security risks to the user; the product has a high reliability requirements, and the use of new technology, new technology design solutions; due to technical or cost reasons, the product failure can not be repaired; the application system of the weight of the product, the size of the size of the strict limitations.

2. Class II, is a medium derating, the use of components to significantly improve reliability. Applicable to the failure of the product will likely cause damage to the application system; high reliability requirements, and the use of some of the off-set design; after-sales service costs, such as higher cases.

3. Grade III, is the smallest derating, the use of components to improve the reliability of the largest relative benefit, but the effect of reliability improvement is not as good as the previous grade II and grade I. Applicable: product failure, will not cause damage to the application system or will not bring safety hazards to the operator; products using mature design standards; failure of the product can be fast, low maintenance and repair costs; the weight and size of the product does not have strict requirements. There are no strict limitations on the weight and size of the product.

If you want to know more about switching power supply information, you can consult Xiamen Eahunt Electronics.

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Email: athene-cai@eahunt.com

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