source:Industry News Popular:adapter release time:2022-01-03 13:56:54 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.
Read recommendations:
24W 2USB Charger,24W Charger ,2USB Charger
MKS-120200EU-36 Switching Power Supply
MKS-1202000-36 Switching Power Supply
Teach you how to distinguish high-voltage cables and low-voltage cables
Lightning Surge Test Method for Switching Power Adapters.adapter factory
Popular recommended products
200-500W Switching Power Supply
2020-08-2924-65W Switching Power Supply
2020-08-2912V2ASwitching Power Supply
2020-08-28MKD-571202000 ADAPTER AC ADAPTER CE ADAPTOR UL ADAPTOR Linear Adapter
2020-08-28MKA-571652420 ADAPTER AC ADAPTER CE ADAPTOR UL ADAPTOR Linear Adapter
2020-08-28EI-66 ADAPTER LINEAR ADAPTOR SWITCHING ADAPTOR Linear Power Adapter Linear Adapter
2020-08-28EI-57 ADAPTER LINEAR ADAPTOR Linear Power Adapter Switching Power Adapter INTERCHANGEABLE ADAPTOR Li
2020-08-28EI-48 ADAPTER LINEAR ADAPTOR Switching Power Adapter INTERCHANGEABLE ADAPTOR Linear Adapter
2020-08-28EI-41 ADAPTER AC ADAPTER LINEAR ADAPTOR SWITCHING ADAPTOR Linear Adapter
2020-08-28EI-35 ADAPTER AC ADAPTER SWITCHING ADAPTOR Linear Power Adapter Linear Adapter
2020-08-28ER42 High Frequency Transformer
2020-08-2712-36W POE POWER SUPPLY
2020-08-27Transformer,Power Transformer,Ring Power Transformer
2020-08-27Transformer，High Frequency Transformer，Frequency Transformer
2020-08-2712-24W Medical Switching Power Supply
2020-08-273-12W Medical Switching Power Supply 3W Switching Power Supply 12W Power Supply
2020-08-2745W PD Charger,45W Charger,PD Charger
2020-08-2736-90W Charger,36W Charger,90W Charger,40W Charger,50W Charger
2020-08-2724W USB Charger,24W Charger,USB Charger
2020-08-2724W 2USB Charger,24W Charger ,2USB Charger
2020-08-2710-24W Charger,24W Charger,10W Charger
2020-08-2730-500W LED Power Supply 30-500W Power Supply
2020-08-27Related Information
What are the conditions of use and maintenance methods for switching power supplies?
2022-05-21Some Frequently Asked Questions about Power Adapters
2022-05-20How to deal with the electromagnetic interference of switching power supply which is difficult in EM
2022-05-19Six situations and solutions that cause the whistling of switching power supplies.power supply price
2022-05-18Lightning Surge Test Method for Switching Power Adapters.adapter factory
2022-05-17Two common power adapter output overload protection methods.ADAPTOR price
2022-05-16Common fault maintenance skills of switching power supply
2022-05-14How should we choose the charger?
2022-05-13Power adapter expertise.CE ADAPTOR
2022-05-12How to solve the high temperature rise of switching power supply transformer?
2022-05-11The role of varistor in switching power supply
2022-05-10Structural characteristics and working principle of varistor
2022-05-09The role of varistor in switching power supply
2022-05-09What are the main components of switching power supply
2022-05-07Two ways for MOS devices to dissipate in high-power power supplies,CE ADAPTOR Processing
2022-05-06Several common insulation protection technologies for power adapters
2022-05-05What are the unique advantages of high frequency switching power adapter
2022-04-27What are the main components of switching power supply.China cnc plastic cutting
2022-04-26Troubleshooting method of switching power supply,CE ADAPTOR wholesale
2022-04-25How to use the power adapter correctly
2022-04-23What is the comparison between a charger and an adapter?
2022-04-23The optimal solution of drone power management solution!
2022-04-22Several common insulation protection technologies for power adapters
2022-04-21What are the unique advantages of high frequency switching power adapter
2022-04-20General Mechanism Analysis of Switching Power Adapter.ac power adapter wholesaler
2022-04-19Suppression method of low frequency ripple of switching power supply
2022-04-16Why is the power adapter making noise?
2022-04-15When the power adapter is in normal use, what is the normal temperature?
2022-04-1490% of people use the car charger incorrectly, are you using it right?CAR POWER SUPPLY sales
2022-04-13The difference between a power adapter and a voltage regulator
2022-04-12Popular recommended products
30-500W LED Power Supply 30-500W Power Supply
2020-08-2712-24W Medical Switching Power Supply
2020-08-2719V2A 36W Switching Power Supply
2020-08-2812W CAR CHARGER,12W USB CAR CHARGER,CAR CHARGER,12W CHARGER
2020-08-2710-24W Charger,24W Charger,10W Charger
2020-08-273-15W Switching Power Supply
2020-08-28MKS-120200BS-36 Switching Power Supply
2020-08-29ER42 High Frequency Transformer
2020-08-2760W 6USB Charger,60W Charger,6USB Charger,Charger
2020-08-2718-25W Switching Power Supply
2020-08-2812W POWER SUPPLY,12W CAR POWER SUPPLY,POWER SUPPLY,CAR POWER SUPPLY
2020-08-27Inductance & Coil
2020-08-27MKS-1201250HEU Switching Power Supply
2020-08-293-100W PCBA power supply 3-100W Customized power supply 3-100W power supply
2020-08-27QC3.0 24W USB Charger,24W USB Charger,24W USB Charger,USB Charger
2020-08-27MKA-571652420 ADAPTER AC ADAPTER CE ADAPTOR UL ADAPTOR Linear Adapter
2020-08-28MKD-571202000 ADAPTER AC ADAPTER CE ADAPTOR UL ADAPTOR Linear Adapter
2020-08-2824-36W Charger,36W Charger,24W Charger,30W Charger
2020-08-27EI-35 ADAPTER AC ADAPTER SWITCHING ADAPTOR Linear Power Adapter Linear Adapter
2020-08-2824V1.5A 36W Switching Power Supply
2020-08-29EI-48 ADAPTER LINEAR ADAPTOR Switching Power Adapter INTERCHANGEABLE ADAPTOR Linear Adapter
2020-08-28EI-66 ADAPTER LINEAR ADAPTOR SWITCHING ADAPTOR Linear Power Adapter Linear Adapter
2020-08-28100-300W Charger,100W Charger,200W Charger,300W Charger
2020-08-2724W 2USB Charger,24W Charger ,2USB Charger
2020-08-2724V21A LED Power Supply 24V Power Supply 21A Power Supply
2020-08-2724-65W Switching Power Supply
2020-08-29MK-C1806028 MKA ADAPTER LINEAR ADAPTOR SWITCHING ADAPTOR Linear Power Adapter Linear Adapter
2020-08-28EI-41 ADAPTER AC ADAPTER LINEAR ADAPTOR SWITCHING ADAPTOR Linear Adapter
2020-08-28EI-57 ADAPTER LINEAR ADAPTOR Linear Power Adapter Switching Power Adapter INTERCHANGEABLE ADAPTOR Li
2020-08-2830W PD Charger,30W Charger,PD Charger
2020-08-27