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Common quality problems with power adapters

26 views Yuda Electronic (HK) Technology Co.,Limited. 2018-07-15

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1. The product is incomplete or not standardized

 

The mark should contain important information to guide the user to properly install and use, and the mark of the correct mark is the basic measure to ensure the personal safety of the user. The mark should be clear and the mark should not fall off after normal use. Should be marked manufacturer or distributor; the model code or model specification, the nature of the power supply, and the rated supply voltage range should be identified. If the information is not complete, it can not correctly guide consumers to use, and some may even misuse and damage the electronic equipment to which it is connected. The common problems are no logo, no factory name or trademark, model code or model specification.

 

2. The heat under normal working conditions does not meet the requirements

 

The function of the power adapter is to change the voltage. In the process of voltage conversion, a part of the electric energy needs to be consumed due to the loss. After the electric energy is converted into heat energy, part of the heat energy is radiated to the surrounding environment through radiation, convection and conduction, and the other part of the heat energy is itself. Absorbed to raise the temperature of the power adapter. Therefore, the temperature of the power adapter can only be controlled within the proper range during normal operation to ensure safety.

The high temperature rise of the power adapter under normal working conditions is a common problem. As the world’s leading IT supplier, Compaq Computer Corporation and Apple Computer Corporation have announced globally that Some laptop adapters may be too hot due to operation. When the temperature is too high, it is easy to cause a fire hazard, Actively recycle and replace power adapters worldwide.

 

Common quality problems with power adapters

As a consumer, pay close attention to the temperature rise of the product during use. The easiest way to do this is to use the temperature rise of the outer test product casing. The difference between the outer casing temperature of the power adapter and the ambient temperature should not exceed 60 ° C, even in hot weather. In summer, the ambient temperature reaches 35 ° C, and the temperature of the outer casing cannot exceed 95 ° C. If the temperature rise of the product is found to be too high, we should stop using it in time.

 

3. There are safety hazards in short circuit and overload

 

In the event of a short circuit in which a component such as a capacitor or a diode is short-circuited, the temperature rise of each component of the power adapter rises sharply. The design and application of electronic circuits should ensure that under abnormal operating and fault conditions, the temperature rise of all parts of the product should not exceed the specified requirements. Under the fault conditions, the power adapter can be damaged, but the safety performance of the equipment cannot be reduced.

Under abnormal working and fault conditions, the product case temperature exceeds 150 °C, and the outer casing softens, which seriously reduces the safety performance of the product.

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