Quality Power Adapter Manufacturer Find

How to design the reliability of the power adapter, the following indicators

1. Reliability: the reliability of the product, that is, the probability of normal operation, refers to the power adapter in the specified conditions and the specified time, the probability of completing the specified function. When calculating the reliability, the larger the number of products at the beginning of the test, and the smaller the test interval, the higher the accuracy of the reliability.

The probability of failure or the probability of damage is also commonly used in assessing product reliability. The probability of failure is the probability of the event corresponding to the degree of reliability. Reliability and failure probability of assessing the reliability of components, switching power supplies, transformers, chargers or complex systems is very simple and intuitive, the greater the reliability, the smaller the failure probability, the higher the reliability.

2. Average life: the average life of a product is the average normal working time of the product, for non-repairable products and repairable products have different meanings.

For non-repairable products, the average life expectancy refers to the average working time of the product before failure, usually referred to as MTTF, that is, the average time before reaching failure.

For repairable products, MTTF is the average operating time between two adjacent failures, i.e., the mean time between failures, usually referred to as MTBF, i.e., the mean time between failures.

The meanings of MTTF and MTBF are similar, and their mathematical expressions are also consistent.

3. Failure rate: the failure rate of a product at any moment t (failure rate, failure intensity) is defined as: the product works to t moment, the probability of failure in a unit of time. It can also be said that the failure rate is equal to the number of products in a unit of time after the moment of t failure and at the moment of t is still working in the ratio of the number of products.

Failure rate is often used to indicate the reliability of electronic products, components, reliability indicators, the lower the failure rate means the higher the reliability. Failure rate of the unit is a percentage of time, such as % / h, % / kh, said the product under test in 1 hour (or 1000 hours) within the percentage of the number of failures. Overseas commonly used non-special (Fit) as a unit of failure rate, that is, 1 million components work 1,000 hours after the emergence of a failure component, known as 1 non-special

4. Failure density: the failure density of the product (refers to the number of failed products per unit of time and the ratio of the starting number of products subject to test, in the test process the failure of the product will not be exchanged.

Evaluation of the reliability of different products, in the above four characterization of the reliability of the indicators can be selected one or two indicators, what kind of indicators depends on the convenience of use. For general switching power adapter, electronic equipment or systems, can be used for reliability (probability of failure); for complex electronic equipment or systems, can be used for the average life expectancy, because such products are not possible to use a larger number of tests; for the components are used through a large number of tests statistically derived from the failure rate to characterize the reliability; for a one-time use or failure is no longer repaired equipment, the use of the density of failures Failure density is used to characterize the reliability of equipment that is single-use or will not be repaired.