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Precautions for the use of switching power supply!

source:power supply     Popular:adapter     release time:2021-07-16 09:54:31     Article author:sznbone    

  Precautions for the use of switching power supply!

  1. Output calculation

  Due to the high efficiency of the switching power supply, which can generally reach more than 80%, in the selection of its output current, the maximum absorption current of the electrical equipment should be accurately measured or calculated, so that the selected switching power supply has a high cost performance. Usually the output calculation formula is:

Precautions for the use of switching power supply!(图1)

  Is=KIf

  In the formula: Is-the rated output current of the switching power supply;

  If—the maximum absorption current of the electrical equipment;

  K—margin coefficient, generally 1.5~1.8;

  2. Grounding

  Switching power supplies produce more interference than linear power supplies. Electrical equipment that is sensitive to common mode interference should take grounding and shielding measures. According to EMC restrictions such as ICE1000, EN61000, and FCC, switching power supplies adopt EMC electromagnetic compatibility measures, so switch Generally, the power supply should be equipped with EMC electromagnetic compatibility filter. For example, the HA series switching power supply of Lead Huafu Technology can meet the above electromagnetic compatibility requirements by connecting its FG terminal to the ground or to the user's case.

  Three, protection circuit

  The switching power supply must have protection functions such as overcurrent, overheating, and short circuit in the design. Therefore, the switching power supply module with complete protection functions should be preferred in the design, and the technical parameters of the protection circuit should match the working characteristics of the electrical equipment. Avoid damaging electrical equipment or switching power supply.

  Four, wiring method

  L: connect to 220v AC live wire;

  N: connect to the 220v AC neutral line;

  FG: Connect to the earth;

  G: Ground of DC output;

  +5v: output +5V point port;

  ADJ: The output voltage is adjusted within a certain range. The rated voltage output on the switching power supply is originally fixed when leaving the factory, that is, the nominal rated output voltage. Setting this potentiometer allows the user to set a smaller value according to the actual use. Adjust the output voltage within the range, under normal circumstances there is no need to adjust it.


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