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Do you understand the cause of abnormal noise in the power adapter?

source:Industry News     Popular:adapter     release time:2022-03-23 09:19:40     Article author:sznbone    

  Do you understand the cause of abnormal noise in the power adapter?(图1)

  Some people will produce abnormal noise when using the power adapter. This sound is a bit like the leakage sound when the high voltage is bad, and it is a bit like the sound of high voltage arcing. Some people call this situation the whistle of the power adapter. So what's the reason for this? You know what?

  Load problem of switching power supply

  1. The transformer works in a serious overload state, and there is a possibility of burning it at all times - this is the origin of the "screaming" before many power supplies burn out.

  2. In the case of no load or light load, the switching power supply will oscillate at some operating points, which is manifested as the howling of the transformer and the instability of the output.

  This phenomenon occurs because at no-load/light-load, the instantaneous turn-on time of the switch is too large, which causes the output energy to be too large, and the voltage overshoot is also large. It takes a long time to restore the normal voltage, so the switch needs to stop working. For a period of time, this switch operates in an intermittent mode of operation, causing the transformer to vibrate at a lower frequency.

  Transformer process problems

  1. If the wire package is not tightly wound, it may also cause noise;

  2. There is an air gap in the magnetic core combination, which causes air vibration and makes a sound at high frequency (if the transformer is fully immersed in a vacuum, it generally does not make a sound);

  3. The dipping paint is not dried in place, resulting in the weak magnetic core causing mechanical vibration and making noise;

  4. The length of the air gap is not suitable, which leads to the unstable working state of the transformer and the sound.


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