The charger has a sound with “buzzing”, will it explode? (Solution to the noise of wall charger)

We often encounter this situation in our daily life. After using the mobile phone charger for a period of time, we often hear it making a “buzzing” sound. What’s happening here? Will it damage the phone? Will there be a safety hazard? Will it explode?

Why does the charger make abnormal noise after being used for a long time? ietcharger here would like to explore with you about the cause of “buzzing” sound when the charger is working.

The phenomenon that the charger has a buzzing sound, the official said that this situation is generally caused by the vibration of a piezoelectric effect of a inside parts in the charger, and the frequency is relatively high, but this phenomenon has no safety hazard.

To analyze the “buzzing” sound problem, we need to look at how the internally of wall charger to works .

The working principle of the charger is to oscillate through Q1 and Q2 to generate alternating current, use the electromagnetic mutual inductance effect to realize the voltage change in the primary coil L1 and the secondary coil L3, and obtain a DC output after rectification. We know that the transformer coil is stressed, because an alternating current will generate a magnetic field when passing through the coil, and the current will generate a force in the magnetic field at the same time.

The inductor coils of the new chargers are generally fixed with lacquer sealing, epoxy resin, heat shrinkable tape, etc., so that the coil cannot vibrate. However, if the charger is used for a long time, these inside materials may age and become loose. The coil itself will also be expanded and contracted by heat to create a gap. The coil may vibrate under force. The frequency of the vibration falls within the range of human hearing ( 20Hz-20KHz), you will be able to hear the sound of “buzzing”. So it will make a belching sound after a long time.

My friends, please don’t be overly alarmed when you hear the buzzing sound of the charger, please confirm whether the phone can be charged, whether the charger is severely hot, or has a burning smell. If not, it can be used normally. If you are still worried about potential safety hazards, we are suggest to use a new charger.

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