What brand of power adapter is good? What is the power adapter? The role of the power adapter

What is the power adapter?

The power adapter is a small portable electronic equipment and Power Supply conversion equipment for electronic appliances. 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; it can be divided into wall plugging according to the connection method And desktop. It is widely used in equipment such as telephone handsets, game consoles, language repeaters, walkmans, notebook computers, and cellular phones.

The role of the power adapter:
Generally speaking, power adapters are transformers and rectifiers, and their role is to convert alternating current into direct current electronic products. Household AC 220v, and our computer uses DC 12v (as if it is), so you can be sure that the power adapter is a transformer and rectifier. The power 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. Transformers are made of silicon steel sheets. After the transformer is energized, magnetic flux is generated. The magnetic flux will cause force between the silicon steel sheets to produce a humming sound. This is normal. But the sound of overheating ground is abnormal, and there are many reasons: 1. The AC voltage is unstable. 2. The chip is damaged. 3. Short circuit between turns. 4. Damaged components, etc.

Is the power adapter universal?
On some occasions, the laptop battery power is insufficient, and there is no power adapter. This situation is very anxious and embarrassing. Some friends may try to borrow someone else's laptop power adapter, but everyone should pay attention, different power adapter brand products are not universal.

There are three main reasons:

1. Different interfaces: Most laptop computer power adapter brands have different interfaces. Different interfaces are relatively safe, because at least you will not plug in a power adapter that does not meet current or voltage to power the laptop computer, causing damage to the computer hardware.

2. Different voltages: The voltages of the power adapters of notebook computers of different brands are different. Even if the power adapter interface is the same, it is not possible to use different brands of laptop power adapters for power supply.

3. Different currents: The currents of different brand notebook computer power adapters are also different. Even if the power adapter is used between laptops of the same brand, it is necessary to confirm the voltage and current specifications.

Power adapter purchase

Pay attention to the following aspects when choosing a power adapter:
1. The logo is clear and the information is complete. The mark is an important information to instruct the user to install and use it correctly, and it is a most basic content to ensure the safety of the user's personal property. At least the following information should be included: the name, trademark or identification mark of the manufacturer or distributor; the model code or model specification; the nature of the power supply; the rated power supply voltage range; the output voltage range, etc.

2. Pay attention to the rated power supply voltage range. Because my country's mains voltage is 220V, when purchasing an adapter, its rated power supply voltage (that is, the input voltage) range should include 220V. Otherwise, the adapter will not only be used normally, but may also cause unsafe hidden dangers such as burnout and breakdown short circuit.

3. Pay attention to the nature of the output voltage. The output of the power adapter has two kinds of AC and DC. When purchasing, the voltage type that meets the needs of the intended use should be selected. On the power adapter logo, the symbol of the AC logo is "~" and the symbol of the DC logo is "-". If you choose an adapter with a DC output, you should also consider the consistency of the positive and negative polarities of the output terminals with the requirements of the device.

4. Pay attention to the output current and voltage range. The output current and voltage are an important indicator for the selection of adapters, which should be consistent with the current and voltage requirements of electronic and electrical products that require power supply. If the voltage or current is too high, the electronic and electrical products will be damaged. If the voltage or current is too low, the equipment will not work properly or work overloaded, which will affect the safety performance.

5. Is there a safety certification mark? From design to mass production, power adapter products need to go through a series of tests to verify whether they meet safety requirements. Products that have passed the safety certification test prescribed by my country will be marked with the "CCC" mark when they are sold.

Best regards,

Ada Zheng