source:Industry News Popular:adapter release time:2022-01-04 09:44:13 Article author:sznbone
1. Unqualified temperature test
1. Due to the small internal space of the product, the layout of the parts is unreasonable;
2. Components with low temperature limits touch or close to components with large heat generation (for example: the output line touches a heat sink or an electrolytic capacitor with a large amount of heat, etc.);
3. Use components with low temperature resistance;
4. Use a wire with a cross-sectional area that is too small;
5. In order to save costs, the company has privately changed the structure of products that have passed the certification without using materials that meet the requirements.
2. Abnormal heat resistance is unqualified
The requirements of the qualified power adapter to withstand abnormal heat shall meet the requirements of clause 4.5.5 of GB 4943.1-2011. The thermoplastic materials with dangerous voltage components shall withstand the requirements of GB/T 5169.21 ball pressure test. At a temperature of 125 ℃, the thermoplastic material The indentation diameter of the material does not exceed 2mm.
and inferior power supplies often have the following problems.
1. Thermoplastic materials of electrical parts have poor high temperature resistance and may be softened and deformed during use;
2. In order to save costs, the company uses inferior materials, which leads to thermal deformation of the fixed live parts.
Three. At the same time, inferior power supplies often have these hidden dangers.
1. Excessive temperature of parts and materials under normal working conditions may cause burning, lower insulation level, lower component performance, and risk of electric shock;
2. Under normal working conditions, the clearance and creepage distance of parts with dangerous voltage and accessible conductive parts are reduced, causing excessive contact current, which may cause electric shock hazard;
3. Insulating materials in a high-temperature environment, the insulation performance may be reduced, or even melted, which may cause electric shock hazard. If the heat hazard may cause serious fire hazards; when the internal circuit short-circuit causes the components to explode, the insulating material may Dissolution causes a fire.
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