288 views Yuda Electronic (HK) Technology Co.,Limited. 2018-06-28
1. Product’s mark is not complete or not standardized
The mark should contain important information that guides the user in proper installation and use. The mark requires durability and eye-catching. After normal use, the mark should not fall off, and the content should be legible. Manufacturer’s name, trademark; model code or model specification; power supply properties; rated voltage range. If the information is not complete, it can not guide consumers to use correctly, and some may even damage the electronic equipment. The common problems are no label, no name or trademark, model code or model specification.
2. Heat under normal working conditions does not meet requirements
The function of the power adapter is to convert the voltage. In the voltage conversion process, some of the electrical energy is consumed due to the loss. After the electrical energy is converted into thermal energy, part of the thermal energy is distributed to the surrounding environment through radiation, convection, conduction. Another part of heat is absorbed by itself, causing the temperature of the power adapter to rise.. When the internal temperature of the equipment rises to a certain temperature, the insulation material will rapidly deteriorate, shortening the service life of the product and deteriorating the safety performance. Therefore, the temperature of the power adapter during normal operation is only controlled within an appropriate range to ensure its safe and normal operation.
The high temperature rise of the power adaptor under normal working conditions is a common problem. Apple Computer has announced on a global scale that some notebook computer AC adapters may be subject to fire risk due to high temperature during operation. Actively recycle and replace power adapters worldwide.
During use, the temperature rise of the product should be taken into account. The simplest and most convenient method is to test the temperature of the product case. The difference between the temperature of the power adapter case and the ambient temperature must not exceed 60°C. Even in hot summer, the ambient temperature reaches 35°C. The temperature of the enclosure must not exceed 95°C. If the temperature rise of the product is found to be too high, we should stop using it promptly.
3. Hidden danger in safety due to short circuit and overload
In the event of a fault such as a capacitor or diode short-circuiting, the internal power loss of the power adapter increases drastically, causing the temperature rise of each part to increase. The design and application of electronic circuits shall ensure that the temperature rise of each part of the product cannot exceed the specified requirements under abnormal operating and fault conditions. Under fault conditions, the power adapter may be damaged, but the safety performance of the equipment cannot be reduced.
A common problem is that the products fail to meet the requirements under abnormal operation and fault conditions. Under the fault conditions, the temperature of some product enclosures exceeds 150°C and the enclosures soften, which seriously reduces the safety performance of the products.
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