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

source:power adapter     Popular:adapter     release time:2021-07-16 13:33:43     Article author:sznbone    

  Some people will produce abnormal noises when using the power adapter. This sound is a bit like the leakage sound produced when the high voltage is bad, and it is a bit like the sound of high voltage arcing. Some people call this situation the power adapter whistle. So what is the reason for this situation? Do you understand?

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

  Switching power supply load problem

  1. The transformer is working in a severely overloaded state, and it may be burnt at all times-this is the origin of the "scream" before many power supplies burn.

  2. Under no-load or light-load conditions, the switching power supply will oscillate at certain operating points, which is manifested as the howling of the transformer and the unstable output.

  This phenomenon occurs because when the switch is under no load or 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, and it takes a long time to recover to the normal voltage, so the switch needs to stop working For a period of time, this switch works in an intermittent working mode, causing the transformer to vibrate at a lower frequency.

  Transformer process problem

  1. The wire package is not tightly wound and it may cause noise;

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

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

  4. The length of the air gap is not suitable, resulting in unstable working conditions of the transformer and making noise.


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