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Analytical reasons for switching power supply transformer whistle

In Electronic Infomation Category: A | on April 28,2011

Made switching power supply based on experience, summed up the transformer howling issued the following main reasons:

A. transformer itself, such as dipping drying is not in place, resulting in mechanical vibration caused by the core is not solid but rattled; there is not suitable for the length of the air gap, resulting in instability of the working status of the transformer will whistles; Finally, the line is not wound tight package may also cause noise.

B. circuit setting, particularly paired use of optocouplers and SP202ECT datasheet and 431, if the bias current is set incorrectly, the circuit will result in an unstable state when the oscillation so that the sound issued; there are 431 end of the output and SP202ECT price and control set between the RC feedback can also cause undue noise caused by vibration.

C. the quality of components, such as the lack of input filter capacitance, the output rectifier fast recovery diode (or Schottky diodes) of poor quality, poor quality of power MOS tube, RCD content or recoil absorption of high-voltage circuit poor quality diodes, etc., these problems can lead to shock caused by noise.

D. board layout is not appropriate to interfere with induced oscillation, resulting in noise.

The second is from mechanical work hard to make the movement of the magnetic molecular vibration does not cause the surrounding air. Is a fixed core, so that he can not produce mechanical vibrations.

Transformer transformer noise is usually not handle the production process can cause the:

Low noise and SP202ECT suppliers and high frequency are mainly noise,

Low-frequency noise is mainly manifested in what areas?

High-frequency noise is mainly manifested in what areas?

Solve the problem is how to do? Are there other aspects of

transformer due to noise?

Transformer noise was mainly due to excitation transformer with low-frequency noise components, making the magnetic core in the low-frequency magnetic fields of molecular motion, resulting in mechanical vibration, the vibration caused by the surrounding air. The vibration of the air and eventually reached the ears of people be heard.

Know the reason, we can find a solution to the. The first is to avoid such a low frequency transformer the magnetic field, that is, work hard from the circuit, so that the transformer magnetizing current away from the band.

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