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Why does a switching power supply suddenly emit a lot of noise?

Article Source：Kinri Energy | Author：Kinri Energy | Issuing Time：2024.06.12
In today's rapidly changing technology, switching power supplies have become an indispensable part of our lives and work. However, sometimes we suddenly encounter a troubling phenomenon - the switching power supply inexplicably emits a lot of noise. What exactly is going on? Let's delve deeper together and unravel the mystery behind it.


500W Switching Power Supply

The Mystery of Switching Power Supply Noise

When we use electronic devices in our daily lives, we sometimes encounter situations where the switch power supply suddenly emits a lot of noise. What exactly is going on?

Possible Cause Analysis

Inductance issue

Under high-frequency current, if the quality of the inductor is poor, loose, or the magnetic core is saturated, it may vibrate and emit whistling noise.

Transformer abnormality

Transformers with loose windings or loose iron cores are prone to vibration and noise during operation.

Capacitor fault

Damaged or degraded filtering capacitors can affect current stability, leading to noise.

Fan factor

When the cooling fan is out of oil, damaged, or has abnormal speed, it can create significant noise.

Other factors cannot be ignored

High frequency oscillation error

Abnormal control circuit or oscillation circuit, causing abnormal switching frequency and resulting in noise.

Overload operation impact

Long term overload causes abnormal operation of components, resulting in abnormal noise.

Poor component contact

Contact problems such as loose pins and solder joints in internal components may also cause noise due to the action of current.

In short, the causes of switching power supply noise are complex and diverse. When we encounter this situation, do not panic, but calmly investigate and analyze various possible factors one by one, find the root cause of the problem and solve it, so that our switch power supply can be restored to quiet and stable. I hope everyone can be more adept at accompanying switching power supplies and avoid being troubled by this annoying noise. What unique insights do you have on the noise of switching power supplies? Welcome to exchange and discuss together!
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