Recently bought HP's 4416s notebook, but when used to find the power adapter will issue a creak sound, looked at other people's notebooks seem to have no such obvious squeaky. Looked with their own model almost HP notebook, although there are creak of the sound, but it seems not my voice big. Someone explained that this is the current work when the sound or the town ...
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It is the power supply is not pure and the capacitor capacitor reasons, such as the sound is too large, then there is a problem with the power adapter, does not affect the use, but the power adapter will soon be hot, and greatly affect the life of the adapter
As the notebook adapter is used in switching power supply,
While the switching power supply load changes little,
Work oscillation frequency in the human hearing threshold slightly higher!
Although it is also ringing,
But you will never hear!
When using the adapter as the main power supply,
It in addition to the books themselves to provide the necessary current,
But also the use of gaps for the rechargeable battery charge!
But the books due to different work procedures,
Current changes from time to time big or small!
Adapter response time slower than the books,
It has to change the oscillation frequency from time to time to adjust the output current size!
But when the oscillation frequency becomes low,
Your ears "listen" see it's shaking the hum!
Coupled with switching power supply core with energy,
Core must have a gap,
So vibration frequency will produce magnetic resonance!
This is sometimes the reason why the sound of the adapter is heard when the big time!
All the use of FM switching power supply equipment,
Will appear this situation!
Such as color TV, Di Weida machine, induction cooker, etc.!
Be assured with it!
As long as the adapter does not smoke, can work properly,
There is no problem with high temperature and hum! The The
1, the power adapter power normal use of the process, in a quiet environment or close to the power adapter can hear a weak current sound, this phenomenon is normal;
2, if the current sound is more obvious, the impact of normal use, the power adapter may be the impact of hardware operation, the proposed repair or direct replacement.
The power adapter in the conversion of the power supply will inevitably send a fixed frequency of the sound, different frequency of the inductance coil because of its rated power is not the same, so the induced current of the sound size is not the same, there will be creak sound.
