Welcome to the official website of the crown Dickson!

Wholesale|Microblogging|Sitemap|Chinese

12V Power Adapter 5V3C certified power charger冠德信二维码

Hotline:400-0239-945

Keywords:5V USB charger, 6W USB charger, 12W USB charger, 12V power adapter, 5V3C certified power charger, 12V3C certified power adapter, power plant safety, ETL certified adapter, MID5V2.1A power

Products
You are here:Home > Support > Company News

About the power adapter common quality problems

Article Source:Author:Popularity:-发表时间:2013/12/18 9:56:28

Rigorous supervision and management of the fierce market competition and government departments, some small production scale, technical conditions are poor, backward production facilities, the lack of technology for small businesses are gradually being phased out, the proportion of medium-sized enterprises increased every year. But in the present stage of the power adapter manufacturers are still small enterprises, and even the existence of some clandestine workshop-style hand, the quality of the products of these companies is worrying, in recent years, AQSIQ and information supervision of the Ministry of industry, companies pass rate of less than 80%, primarily in the following some quality problems:

 

1. Labeled products are incomplete or non-standard

Tag should contain important information to guide users installed and used correctly labeled products are labeled to ensure personal and property safety of users of one of the basic measures. Labeling requirements for durability and eye-catching, after normal use marks should not fall off, the content should be clean and legible. Domestic sales of the product requirements with Chinese Simplified logo should contain at least the following information: the name of the manufacturer or distributor, trademark or identification mark; model number or model specifications; Power nature; rated supply voltage range. If the information is not complete, can not properly instruct consumers to use, and some may even be damaged by its misuse connected with electronic devices, a common problem for non-Chinese identity, no name or trademark, model number or model specifications.

2. Power plug is not standardized

China provides domestic single-phase grounding plug has two poles and poles with no grounding in two forms, as shown in the use of the power plug should be inserted to prevent unipolar, that is, when any charged with a plug socket plug plug plug cover timely other pins can not be in a state that is easily accessible. In spot checks found that the existence of the phenomenon of long bolt, bolt too long increases the user in the process plug electric shock. In addition, the shape of the power plug does not meet the requirements are more common, because of these plugs and sockets used in China is not complete, users can also easily cause an electric shock.

 

3. Under normal operating conditions, the heat does not meet the requirements

After the effect of the power adapter that transform voltage, the voltage conversion process consumes part of the loss due to the presence of electrical energy into heat energy, part of the heat by radiation, convection, heat conduction in three ways to distribute the surrounding environment, the other part of the heat were their own absorption, so that the temperature rise of the power adapter. Heat-resistant insulating material law indicates that the internal temperature rises to a certain temperature after the rapid aging of insulation materials will lead to shortened product life test, resulting in lower safety performance. Therefore, when the normal operating temperature of the power adapter is only controlled within an appropriate range, in order to ensure their safety, work properly.

Power adapter under normal operating conditions of high temperature is a common problem, as the world's leading IT suppliers Compaq Computer Corporation, Apple Computer Inc. have announced a global scale, some laptop AC adapter may Because when the operating temperature is too high, likely to cause a fire hazard, and the recovery in the global initiative to replace the power adapter.

In supervision, found that some of the product under normal operating conditions, the product of the printed circuit board and transformer winding temperature is too high, there is a big security risk. As a consumer, in use should pay close attention to the temperature rise of the product, the easiest way is to use the test products shell temperature, the temperature difference between the power adapter housing and the ambient temperature must not exceed 60 ℃, even in the hot summer, the ambient temperature reaches 35 ℃, case temperature can not exceed 95 ℃, such as the discovery of high temperature product we should be promptly discontinued.

4. Short circuit and overload product safety hazards exist

Output short circuit under fault conditions, and other parts of the capacitor or diode short circuit, internal power adapter loss increased dramatically, resulting in various parts of the temperature rise. Design and application of electronic circuits, should ensure that under abnormal operating and fault conditions, the temperature in different parts of the product can not exceed the specified requirements, and more items are not the surrounding fire hazard, the power adapter can be damaged during a fault condition, but can not reduce the safety performance of the equipment.

Under abnormal operating conditions and the product is mainly the fault is a problem prevalent in checks, some products under fault conditions enclosure temperature exceeds 150 ℃, the shell appeared to soften, seriously reduce the safety performance of the product.

 

Power transformers are key components in the power adapter, from the safety isolation between the primary circuit and the secondary circuit. Therefore, the frame material and thickness, number of layers of transformer insulating tape, there are stringent requirements to meet reinforced insulation between primary-level requirements. Individual products under fault conditions due to the transformer winding temperature rise too high, causing the skeleton melted.

 

III. Conclusion

The power adapter is the national provisions 3C certification of products, the existence of these quality issues, some enterprises are mainly the lack of comprehensive safety standards, accurate knowledge and understanding, in addition to the product structure design is unreasonable, in order to reduce the cost of cutting corners, which is caused by some of the products failure of the important reasons.

This article keywords: