What are the common production quality problems with power adapters?

In recent years, pass intense market competition and the strict surveillance that the government part manages, the small business that a few production scale is small, technical condition is poor, production equipment is backward, lack technical strength is being eliminated gradually, the proportion of large and medium-sized enterprise advances year by year. But in our country present stage power adapter production enterprises there are still many small and medium enterprises, even the underground factory, there are still some manual mill concern the situation of quality of these products, countries in recent years, inspection and quarantine and surveillance in selectiving examination, organized by the ministry of information industry enterprises pass rate less than 80%, so what are their common production quality problems?

1. The power plug is not standard
Our country stipulates the household single-phase Power Supply plug has two kinds of forms: pole does not have ground and pole takes ground, the power supply plug should be able to prevent unipolar plug in the use, namely when any plug of the plug and socket live plug sleeve plug, other plug cannot be in the state of easy to touch. In the spot check, it is found that the bolt is too long, which increases the risk of electric shock. In addition, the appearance of the power plug does not meet the requirements is also more common, as a result of these plugs and the socket used in our country is not matched, it is also extremely easy to cause the user electric shock.

2. Potential safety risks exist in the case of short circuit and overload
Under the fault condition of output short circuit, capacitor, diode and other parts short circuit, the internal loss of the power adapter increases sharply, resulting in the temperature rise of each part. The design and application of electronic circuit, should ensure that under abnormal working and fault conditions, the temperature rise of each part of the product cannot exceed the specified requirements, more can not make the articles around the fire hazard, in the fault conditions of the power adapter can be damaged, but can not reduce the safety performance of the equipment.

It is a common problem in spot check that the power adapter fails to meet the requirements under abnormal working and fault conditions. Under fault conditions, the shell temperature of some products exceeds 150℃, and the shell softens, which seriously reduces the safety performance of the products.

Best regards,

Shirley Liang