What is power adapter? Function of power adapter
What is the power adapter?
Power adapter is a small portable electronic equipment and electrical and electronic power supply conversion equipment, generally formed by the shell, power transformer and rectifier circuit, according to its output type can be classified as AC output and DC output type; by way of connection ,can be classified as wall and desktop. Widely used in the phone son machine, game players, language repeaters, Walkman, portable computers, cellular phones and other equipment.
The function of the power adapter:
In general, the power adapter is the transformer and rectifier, the role is to convert AC power into direct current electronic products. Home AC 220v, and our computer is DC 12v (as if), so be sure that the power adapter is a transformer and rectifier. Power adapter is a transformer, then we should know that AC 220v voltage passes through the transformer, through the rectifier change the AC to be DC, where there is consumption, and these consumption will be converted into heat, so the power adapter will be hot is normal. Transformer is made of silicon steel, the current connect to the transformer , resulting in magnetic flux, magnetic flux will lead to the formation of silicon steel between the role, resulting in buzzing sound, which is normal. But the sound too big is not normal, for many reasons: 1, AC voltage instability. 2, chip damage. 3, short circuit between turns. 4, component damage and so on.
Is the power adapter common for use?
In some cases suddenly laptop battery power shortage, and no power adapter, this situation is very anxious and embarrassing. Some friends may try to borrow someone else's laptop power adapter, but we should pay attention to, different power adapter brand products can not be common in using.
There are three main reasons:
1, the interface is different: most laptop power adapter brand interfaces are different interface, but relatively safe, because at least you will not use the no correct current and voltage power adapter to charging for the notebook, which will lead to computer hardware damage.
2, the voltage is different: different brands of laptop power adapter voltage is not the same. Even if the power adapter interface is the same, can not use different brands of laptop power adapter for power supplying.
3, the current is different: different brands of laptop power adapter current is not the same. Even the same brand of notebook computers want to use the same power adapter,need to confirm the voltage and current specifications.
Power adapter choosing
Buying power adapter should pay attention to the following aspects:
1, clear signs, complete information. The mark is an essential message indicating that the user is properly installed and used, and is the most basic content to ensure the safety of the user's personal property. At least the following information should be included: name of the manufacturer or distributor, trademark or identification mark; model code or model specification; power supply nature; rated power supply voltage range; output voltage range.
2, pay attention to the rated power supply voltage range. Because the city's electricity voltage is 220V, so the optional adapter, the rated power supply voltage (ie, input voltage) range should include 220V, otherwise the adapter not only can not be used normally, and may bring burns, breakdown short circuit and other unsafe risks.
3, pay attention to the output voltage. The output of the power adapter have AC and DC two types, and the voltage type should be selected correct when choosing . On the power adapter label, the symbol for the AC is "~" and the symbol for the DC is "-". If you choose to the DC adapter, still need to consider the consistency for output terminal of the positive and negative polarity and equipment requirements .
4, pay attention to the output current and voltage range. The output current and voltage is an important indicator for choosing adapter, and need to be same with the current and voltage of power supplied electrical and electronic products. If you choose the voltage, the current is too high, it will damage the electrical and electronic products, if the choosing voltage, current is too low, the device can not work or overload work and affect safety performance.
5, whether have safety certificate mark. Power adapter products from design to mass production, need to go through a series of tests to verify compliance with safety requirements. The products which can pass China's safety certification test will be posted with the "CCC" logo.
