How to reduce the ringing of transformer (switching power supply)?

Transformer and switching power supply itself is a "sound container", because both electrical equipment and switching power supply transformer have normal vibration during normal work. Only when the parts or the outside of the transformer are loose or deformed, the sound generated by the transformer will refract and overlap internally, forming a low-frequency * * * vibration * * sound, which directly affects people's physical discomfort. Eslite technology can tell you the main reason for the vibration of switching power supply transformer:? ? 1, the transformer core consists of a stack of silicon steel sheets. When the transformer is normally energized, the iron core vibrates due to magnetostriction, and the joint between silicon steel sheet and lamination vibrates under the action of thrust and longitudinal traction. This vibration makes the surrounding air or oil vibrate, which is the source of sound. ? ? 2. Too few primary coils and too big joints lead to vibration of the magnetic core. ? ? 3. The internal coil structure of the transformer is uneven, which is easy to cause "buzzing" abnormal sound. ? ? 4. The fan of the transformer cooler will produce noise when it runs at high frequency. ? ? 5. The operating space and environment of the transformer are generally harsh, some components are easy to age, and the joint will become noisy. ? Accordingly, it can be solved from three sources: shock absorption, sound absorption and sound insulation. ? 1. The core vibration caused by magnetostriction and the core vibration caused by magnetic leakage at the joint of silicon steel sheets and between laminations belong to structural noise. The best solution is to add damping plates and sound absorbing plates to suppress vibration. ? ? 2. It is the most direct and fundamental solution to reduce sound transmission by strengthening the internal sealing resistance of electronic equipment, and installing sealing strips and internal sealing strips at each connection can solve this problem well. ? ? 3. Sticking a layer of shock absorption, sound insulation cotton or noise reduction pad inside can effectively alleviate the ringing of electronic equipment at high speed and reduce the noise spread caused by the transformer. As? The noise of Eslite's technicians is very harmful to people. Only by finding out the different noise sources of the transformer in a targeted way can we suit the remedy to the case, eradicate "* * * vibration * * *" and get rid of the disease.