People who have engaged in the power adapter know that in the process of testing the power adapter, you will often hear some whistling sounds, similar to the leakage sound when you hit the high voltage bad, or like the sound of high voltage arcing. So when these phenomena occur, how should they be resolved?
Generally speaking, the switching power supply whistling is generally due to the following triggers.
1, the transformer process problems
Dip paint drying is not in place, resulting in the core is not solid to cause mechanical vibration and rattling sound;.
The length of the air gap is not suitable, resulting in the transformer's working condition is not stable and sound.
The wire wrapping is not tightly wound, which may also lead to rattling.
2, transformer loop problem
Transformer loop problem means that the loop of the transformer oscillates thus causing the transformer to whistle.
Circuit board wiring is not appropriate, thus causing interference triggered oscillation, resulting in ringing.
Feedback loop parameters are not set properly, resulting in loop instability to generate oscillations and sound.
Loop in the quality of components, such as input filter capacitance is insufficient, the output rectifier fast recovery diode quality is not good, the power MOS tube quality is not good, the RCD backlash absorption loop of high-voltage capacitors or diodes of poor quality, etc., these problems may lead to oscillation and cause the sound.
3, the transformer core problem
Transformer core saturation occurs, the coil current increases, the transformer heat and produce self-excited oscillation, coil oscillation caused by the vibration of the surrounding air and thus the sound.
The above are the reasons that may affect the power adapter whistling, Eahunt summarized in the hope that it can help you.
Eahunt is the source manufacturer, experienced in developing and designing power supply products, the production capacity is also very sufficient, the quality of the quality is also done very certified, and only do safety regulation power supply, so many domestic and foreign companies like to find Eahunt production of customized power adapters!
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