The power adapter is also called an external power supply (switching power adapter), which is a power supply transformer for small portable electronic devices and electronic appliances.
It is produced because in real life, electronic devices often cannot directly use household electricity, because the power supply voltage used in the home is 220 volts, and the general electronic products generally require a power supply voltage of 5 volts to 20 volts. about.
So the role of the power adapter is very important (module power supply), especially if you go to the United States and other countries, the voltage is different from ours, then you need a 220V to 110V transformer. With it, we can use these electronic products conveniently and safely. So, what is the role of the power adapter?
The composition and application of power adapter
Power adapters are commonly found in small electronic products such as mobile phones, LCD monitors, and notebook computers. It is generally composed of a shell, a power transformer and a rectifier circuit. According to its output type, it can be divided into AC output type and DC output type. According to the connection method, it can be divided into wall type and desktop type. Power adapters are 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 in these fields have a role that cannot be ignored.
The role of power adapter
Generally speaking, the role of the power adapter is the transformer and rectifier. Home AC power 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 into a voltage through a transformer and transformed into a direct current through 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 sheets. After the transformer is energized, magnetic flux will be generated. The magnetic flux will cause force action between the silicon steel sheets, resulting in a buzzing sound. This is normal.
But the sound of the fire is abnormal, and there are many reasons:
AC voltage is unstable
Chip breakage
Short circuit between turns
Component damage, etc.
By the way, the role of the adapter is an electronic product that converts alternating current into direct current.
Power adapters with large space are generally built-in. Generally, the size of the adapter is not small. Small-sized machines are external. In order to save space, it is also convenient to replace. It's dangerous inside.
Some problems to be paid attention to when using the power adapter
There are generally several items on the label of the power adapter (hereinafter referred to as adapter) that need attention.
First, it is the model of the adapter. For example, the model of this adapter is XVE-120100. It tells us a few pieces of information, including its manufacturer, wattage, etc. The beginning of XVE is generally ##Company code, 120100 means this Adapter is 12W, 050200 is 10W.
Second, it is the INPUT of the adapter, which is generally 100-240V~50-60Hz in China, which shows that this adapter can work normally under the voltage of 100V-240V.
Third, it is the OUTPUT of the adapter. Two numbers can quickly calculate the wattage of the adapter. For example, for this adapter, voltage 12V*current 1A=12W (power), indicating that the power supply is a 12W adapter.
The power adapter of most notebook computers can be suitable for 100～240V alternating current (50/60Hz). Basically, most notebook computers have an external power supply, and use a power cord to connect to the host, which can reduce the size and weight of the host. Only a few models have the power supply built in the host.
There is a nameplate on the power adapter, which indicates power, input and output voltage and current and other indicators. Pay special attention to the range of input voltage. This is the so-called "travel power adapter". If you go to a country where the mains voltage is only 110V When this feature is very useful, some parallel-imported laptops are only sold in the country of origin. They do not have this compatible voltage design, and even have a single input voltage of 110V. If they are plugged in under the 220V mains voltage in our country, they will burn out.
The function of the power adapter is to convert the high voltage at home into a stable low voltage that can work, so that they can work normally. Without it, it will bring a lot of inconvenience to our daily use. This article mainly introduces the function, composition and application of the power adapter, as well as several issues that need to be paid attention to when using the power adapter.
