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    How to determine if the power adapter is qualified
    time:2019-07-05 09:59        Click volume:【126 】Times

    The assessment of the quality of the power adapter, the most important is the safety issue. Then to assess the quality of a power supply, you can first check to see if it has passed the necessary safety certification. In general, the more power certification products get the more reliable the quality of the power supply. The power supplies currently sold in the market must pass the national mandatory 3C certification system before they can be sold. An FCC-certified power supply shields electromagnetic interference generated during operation to eliminate damage to the human body. In addition, the UL certification mark will be seen on some advanced power supplies. It is one of the most stringent certifications in the world, and has restrictions on the structure, materials, test instruments and methods of the power supply. Circuits that need to be added to improve safety and stability. The following power adapter brand manufacturers talk about the standard of qualified power adapters.

    First, the circuit that needs to be added to improve safety and stability.

    1. Lightning protection circuit: When the mains generates high pulse voltage due to lightning strike or other factors, it will damage the equipment on the circuit. The function of the power supply lightning protection device releases a large amount of pulse energy generated by the induced lightning strike on the circuit to the safety ground in the shortest time, thereby protecting the user equipment on the circuit. This is the core function of the lightning protection device.

    2, EMI filter circuit: EMI filter circuit is mainly used to filter the high frequency pulse of the power grid to the power supply interference, but also to reduce the electromagnetic interference of the switching power supply itself to the outside, EMI is an important content of CCC certification.

    3. PFC circuit: “Power factor correction” is mainly used to characterize the utilization efficiency of electronic products for electric energy. The higher the power factor, the higher the utilization efficiency of electric energy. PCC circuits must be added to CCC-certified computer power supplies to reduce the risk of reduced line power factor.

    Second, to determine the quality of a power supply, it must also see whether the necessary safety certification has passed.

    1. Generally speaking, the more certified the product, the more reliable the quality of the power adapter. The power supplies currently sold in the market must be sold after the national mandatory 3C certification system. The existing 3C certificates have four versions: CCC (S) safety certification, CCC (SE) safety and electromagnetic compatibility certification, CCC (EMC) electromagnetic compatibility certification, CCC (F) fire certification. Among them, CCC(S) only represents the passing of safety standards.

    2. In addition to the 3C certification, the UL certification mark will be seen on some advanced power supplies. It is one of the most stringent certifications in the world, and has restrictions on the structure, materials, test instruments and methods. . Some high quality power supplies are also FCC certified, which is a certification for electromagnetic interference. An FCC-certified power supply shields electromagnetic interference generated during operation to eliminate damage to the human body.


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