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Home > News > What is the role and principle of the power adapter?

What is the role and principle of the power adapter?

2020-05-04

Power adapters are commonly found in small electronic products such as mobile phones, LCD monitors and notebook computers. It is generally composed of a housing, a power transformer and a rectifier circuit. It can be divided into AC output type and DC output type according to its output type, and can be divided into wall-plug type and desktop type according to the connection method.

The Power Adapter is widely used in industrial automation control, military equipment, scientific research equipment, LED lighting, industrial control equipment, communication equipment, power equipment, instrumentation, medical equipment, semiconductor refrigeration and heating, air purifiers, electronic refrigerators, liquid crystal displays, LED lamps , Communications equipment, audio-visual products, security, computer cases, digital products and instruments and other fields, and have a role that cannot be ignored in these fields.

In general, the role of the power Adapter is the transformer and rectifier. The household AC is 220v, and our computer uses DC 12v, 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 a transformer and DC by a rectifier. There is consumption here, and these consumption will be converted into heat, so it is normal for the power adapter to generate heat.
The transformer is made of silicon steel sheet. After the transformer is energized, it generates magnetic flux. The magnetic flux will cause a forceful effect between the silicon steel sheets, which will produce a humming sound. This is normal.
However, the sound of the earth is abnormal, there are many reasons:
The AC voltage is unstable, the chip is damaged, the inter-turn short circuit, the component is damaged, etc.
By the way, the role of the adapter is to convert AC to DC electronic products
The power adapter has a large space and is generally built-in. Generally, the size of the adapter is not small. The small-sized machines are external. In order to save space, it is also convenient to replace. Inside is more dangerous.

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