The role of the source adapter

 

The role of the power adapter is the transformer and the rectifier. Household AC power is 220v, and our computer ground is DC 12v (as if it were), so we can be sure that the power adapter is a transformer and rectifier. Then the adapter is a transformer. We should all know that the AC 220v is transformed through the transformer and the DC through the rectifier. There is consumption here, and this 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 energized, a magnetic flux is generated, and the magnetic flux will cause a force between the silicon steel sheets, resulting in a humming sound, which is normal. But the sound of the earth is not normal if it is too hot. There are many reasons: 1. The AC voltage is unstable. 2. The chip is damaged. 3. Short circuit between turns. 4. Components are damaged.

 

Features of the power adapter

 

The power converter (both AC to DC) converts alternating current to direct current, and then passes through the computer, it cannot protect the computer, but the computer has a memory (also called a charger) that stores power, so it can be protected in the event of a power outage computer. Both switching power supplies and adapters are switching power supplies, which are composed of high-frequency switching tubes and their control circuits. The adapter power supply is a regulated switching power supply. The switching power supply charger has a floating charging function. The voltage increases with the decrease of the current. After Z, there is only voltage and no current.

 

Application of power adapter

 

It is widely used in consumer electronic products, and most of the output power provided is within 100 watts, and the market demand is growing rapidly. Such as electric bicycle battery chargers, small size LCD TVs, notebook computers, printers, DVD players and set-top boxes, etc. have applications. Most of the early power adapters used linear transformers. With the requirements of high efficiency and wide input voltage range for power adapters in consumer electronic products, and the increase of copper, iron and labor costs, most of the original linear transformers in such power adapters gradually Replaced by switching power supply.