Basic method of factory inspection of power adapter

Inspection is an important task in the production of power adapter manufacturers, which runs through the entire process of power adapter production.

Power adapter factory inspection work generally includes self-inspection, mutual inspection and full-time inspection system. Generally, the inspection work mainly refers to full-time inspection, that is, the full-time personnel of the quality management department of the power adapter manufacturer observes and compares all the raw materials, components, parts and components required for the switching power adapter to the whole of the switching power adapter according to the corresponding technical documents.

The power supply inspection methods include two types: full inspection and random inspection. The inspection method of the product should be determined according to the characteristics, requirements and production stages of the product. It is necessary to ensure the quality of the product and adhere to the principle of economic rationality.

1. Full inspection

The full inspection is to inspect all products. Full inspection can improve the reliability of the product, but it will consume a lot of manpower and material resources and increase the production cost of the product. It is usually only for the inspection of products that require particularly high quality and products that are produced after the production conditions and production processes have changed.

2. Sampling

Sampling is a widely used inspection method in the production of power adapter manufacturers. In the mass production process of the power supply product, it is not necessary to use the full inspection method for the production of the parts and finished products. Usually, several samples are taken from the product to be inspected for inspection, that is, sampling is performed.

Sampling should be carried out under the premise of mature product design, process specifications, stable equipment and reliable tooling. The number of samples taken should be determined according to the cardinality of the product to be inspected and the sampling standard in the national standard. Samples should not be taken from continuously produced products, but should be randomly selected from the batch.

3. Judgment of test results

Power adapter failures typically include fatal, heavy, and light defects. A fatal defect is a safety defect, that is, as long as a fatal defect occurs in the sample, the product of the sampling lot is judged as unqualified. A heavy defect is an A fault, and a light defect is a B fault. In the absence of fatal defects, the quality of the sampled product should be judged based on the number of A and B failures present in the sample and the sampling standards in the national standard.

The quality of the power adapter is determined by the Common Product Qualification Level (AQL). For products with different quality requirements, the quality indicators are also different. The inspection should be based on the number of A and B faults allowed under the specified AQL value of the product under inspection.