What is the function of power adapter? Generally speaking, the function of power adapter is transformer and rectifier. The home AC power is 220v, while our computer land is 12v DC (as if), so we can be sure that the power adapter is a transformer and rectifier. The adapter is a transformer, so we should all know that AC 220V is transformed by transformer and DC is transformed by rectifier. There is consumption here, and these consumption will be converted into heat, so it is normal for the power adapter to heat up.

The transformer is made of silicon steel sheets. After the transformer is powered on, it will produce magnetic flux, which will lead to the force between silicon steel sheets, resulting in buzzing sound, which is normal. However, if the noise is too high, it will be abnormal. There are many reasons: 1. The AC voltage is unstable. 2. The chip is damaged. 3. Turn to turn short circuit. 4. Component damage, etc. By the way, the function of the adapter is to convert alternating current into direct current

The power adapter with large space is usually built in. Generally, the adapter is not small, and the small machine is external. In order to save space, it is also convenient to replace the adapter. The adapter uses high mains voltage, which is dangerous to put the machine inside.