Overseas power adapters teach you the reliability indicators of switching power supplies.First of all,we need to know what reliability is?
Reliability is a very important quality index of switching power supply adapter products.Quantification of reliability is conducive to providing clear and unified indicators for the reliability of various products.Quantification of reliability can use different indicators according to needs.
Overseas power adapter
Reliability indicators mainly include reliability,average life,failure rate and failure density.
1.Reliability:The reliability of the product is the probability of normal operation,which refers to the probability that the product will complete the specified function under the specified conditions and within the specified time.When calculating the reliability,the larger the number of products at the beginning of the test and the smaller the test time interval,the higher the accuracy of the reliability.
When evaluating product reliability,it is also commonly used to express failure probability or damage probability.The probability of failure is the probability of the corresponding event for the reliability.Reliability and failure probability are very simple and intuitive for evaluating the reliability of components,switching power supplies,transformers,chargers or complex systems.The greater the reliability,the smaller the failure probability and the higher the reliability.
2.Average lifespan:The average lifespan of a product refers to the average normal working time of the product,which has different meanings for non-repairable products and repairable products.
For non-repairable products,the average life refers to the average working time before the product fails,usually called MTTF,which is the average time before failure.
For repairable products,the average life refers to the average working time between two adjacent failures,that is,the average working time between failures,usually called MTBF,which is the average time between failures.
The meanings of MTTF and MTBF are similar,and their mathematical expressions are also consistent.
3.Failure rate:The failure rate(failure rate,failure intensity)of a product at any time t is defined as the probability of failure per unit time after the product works to time t.It can also be said that the failure rate is equal to the ratio of the number of products that fail in a unit time after time t to the number of products that are still working at time t.
The failure rate is often used to indicate the reliability index of electronic products and components.The lower the failure rate,the higher the reliability.The unit of failure rate is the percentage of time,such as%/h,%/kh,indicating the percentage of failures of the tested product within 1 hour(or 1000 hours).Fit is often used abroad as the unit of failure rate,that is,1 million components work for 1000 hours and one failed component is called 1 Fit.
4.Failure density:The failure density(failure frequency)of a product refers to the ratio of the number of failed products per unit time to the initial number(total number)of tested products.Products that fail during the test will not be replaced.
The unit of failure density is 1/h,that is,the ratio of the number of failed products per hour to the total number of tested products.
Overseas power adapter
SHENZHEN JYH Power device Co.,limited is a high-tech enterprise integrating independent research and development,production and sales of Shenzhen power adapters,car chargers,charging back clips and mobile power supplies.
When evaluating the reliability of different products,one or two indicators can be selected from the above four indicators that characterize the reliability,and which indicator to use depends on the convenience of use.For general switching power supply adapters,electronic equipment or systems,the reliability(failure probability)can be used;for complex electronic equipment or systems,the average life can be used,because it is impossible to test with a large number of such products;for components The failure rate obtained through a large number of test statistics is used to characterize the reliability;for the one-time use or the equipment that will not be repaired after failure,the failure density is used to characterize its reliability.
The reliability of switching power supply products can be quantitatively evaluated by mean working time between failures(MTBF).At present,the electronics industry at home and abroad has taken the mean working time between failures as one of the main criteria for evaluating and measuring product quality.The average trouble-free working time of a civil electronic machine usually refers to the average working time from the time the product leaves the factory to the first failure;the average trouble-free working time of an industrial electronic machine usually refers to the average time between two failures.operating hours.
To improve the reliability and MTBF of switching power adapters,the most basic factors that affect MTBF should be determined first,and then resolved according to their causes.Most of the failures of switching power supply products are caused by damaged components.The average trouble-free working time of electronic components is its life cycle.Once the electronic components fail,it marks the end of the life of the power adapter.The more components used in the switching power supply,the higher the failure rate,the lower the reliability,and the shorter the mean working time between failures.Therefore,when designing a switching power supply,try to use integrated components to reduce the number of components in the whole machine and simplify the circuit structure.At the same time,components with low failure rate should be selected as much as possible,and components that meet national quality standards should be selected.In the stage of developing a switching power supply adapter,the use of self-made or non-standard components should be avoided as much as possible.
In addition to components,the failure of solder joints is another important factor that causes the failure of the whole switching power supply product.Because mistakes are unavoidable in the process of printed circuit board production,assembly,and welding,if the number of solder joints in the product is large,the welding technology or the quality of the flux is poor,the average trouble-free working time of the switching power supply will inevitably change.short.
In line with the business philosophy of"integrity-based,reputation first",the company strives to improve market competitiveness around the three core elements of"quality,service,and price".All products produced comply with CCC,TUV/GS,SAA,UL/CUL,CE,FCC,C-Tick,ROHS,CEC.DOE VI standards,business coverage in China,Europe,America,Australia,Africa,Middle East,Southeast Asia and other dozens of countries and regions.Welcome to inquire.【Overseas Power Adapter】
