221 views Yuda Electronic (HK) Technology Co.,Limited. 2018-07-15
1. The product is incomplete or not standardized
The mark should contain important information that guides the user to properly install and use, and the correct mark is the basic measure to ensure the user’s personal safety. The marking should be clear and the marking should not fall off after normal use. The manufacturer or distributor should be identified; the model code or model specification, power supply characteristics and rated supply voltage range should be identified. If the information is incomplete, the consumer will not be properly guided, and some may even misuse and damage the electronic device connected to it. A common problem is that there is 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. During the voltage conversion process, a part of the power needs to be consumed due to the loss. After the electrical energy is converted into thermal energy, part of the thermal energy is radiated, convected and conducted to the surrounding environment, and the rest of the thermal energy itself. Absorbs the temperature of the power adapter. Therefore, during normal operation, the temperature of the power adapter can only be controlled to an appropriate range to ensure safety.
High temperature rise of the power adapter under normal operating conditions is a common problem. As the world’s leading IT supplier, Compaq Computer and Apple Computer have announced worldwide that some laptop adapters may overheat due to operation. When the temperature is too high, it is easy to cause a fire.
As a consumer, please pay close attention to the temperature rise of the product during use. The easiest way is to use the temperature rise of the external test product housing. Even in hot weather, the difference between the case temperature of the power adapter and the ambient temperature should not exceed 60 °C. In summer, the ambient temperature reaches 35 ° C and the case temperature does not exceed 95 ° C. If the product temperature 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 case 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 the temperature rise of the various components of the product should not exceed the specified requirements under abnormal operating and fault conditions. In the event of a fault, the power adapter may be damaged, but the safety performance of the device cannot be reduced.
In the case of abnormal operation and failure, the product case temperature exceeds 150 ° C, and the case is softened, which seriously reduces the safety performance of the product.
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