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How to choose the right power module


The function of the power module is actually the conversion of voltage, it can convert AC or DC into the AC or DC you need. For example: convert the 220V alternating current (AC) of the mains into 5V direct current (DC), because the 220V alternating current is high-voltage power, and the electronic products are powered by low-voltage, which requires a conversion device to convert the 220V alternating current voltage into low pressure. Another example is that sometimes it needs to be converted into 220V AC for use in a motor vehicle, then this will become a low voltage to a high voltage, because the voltage of the motor vehicle is generally relatively low.

    In short, it is similar to a mobile phone charger. Your mobile phone is out of power and needs to be plugged in or charged for normal use, but you cannot use it directly with 220V, because the mobile phone will be burned, so a special conversion device is required. to convert to the voltage required by the mobile phone.

    How to choose the right power module?

    1. The principle and process of circuit design

    The distinction between good and bad circuit principles can usually only be done from a professional point of view. At present, power modules can be roughly divided into two types: bare board and potting. The bare board can be arranged in an intuitive way, such as the layout of electronic components is reasonable and orderly, generous, orderly, and the soldering is clean and straight. For the potted module, it is impossible to view the internal situation, but because it is not exposed, it is much better in terms of security and performance indicators. The soldering process can include manual soldering and wave soldering. The quality of the mechanized wave soldering process is better than that of manual soldering.

    2. Components of the chip

    The core of the power supply is the IC, which is like the brain of the power supply. The quality of the IC directly affects the parameters of the power supply.

    3. Transformer components

    It is the transformer that determines the power and temperature resistance of the power supply. The transformer is responsible for completing the alternating current - direct current, and the energy overload will saturate the fryer

    4. Electrolytic capacitors and ceramic capacitors

    Electrolytic capacitors, power modules and monolithic electrolytic capacitors, which use sulfuric acid as the insulating medium, can make a larger capacity into a smaller volume, and are marked with a + symbol on it, and some are marked with a - symbol, generally It is used for low-frequency cross-linking and bypass filtering. The disadvantage is that the loss of muons is larger. Monolithic electrolytic capacitors, due to the use of special materials, have better performance than ordinary electrolysis, and have better frequency characteristics. In precise circuits, such as oscillators, or timing circuits.

    Ceramic capacitors include ceramic dielectric capacitors, ceramic chip capacitors, ceramic tube capacitors, and ceramic semi-variable capacitors. It is mainly non-polar, the dielectric material is better, and the capacity cannot be made too large. Suitable for high frequency circuits.

    5. Batch testing aging and high temperature aging test

    No matter how well the product material and production process are controlled, it is necessary to detect aging. Because the incoming inspection of electronic components and transformers is difficult to control, only through the aging and high temperature sampling inspection of the entire batch of power supplies can we detect the quality stability of this batch of power supplies and whether the materials have potential safety hazards.

    6. Management methods and incoming materials

    Whether the final management method is strict and the supervision of incoming materials will eventually become the final guarantee of whether the quality of its power products can be guaranteed.

    Through the above introduction, you must understand how to choose the right power module