Power adapter application

　　Power adapters are commonly found on small electronic products such as cell phones, LCD monitors, and notebook computers. It is generally composed of a casing, 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.

　　It is widely used in telephone sub-machines, game consoles, language repeaters, Walkmans, notebook computers, cellular phones and other equipment.

　　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 and lanterns , communication 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. So what are the functions of the power adapter?

　　Generally speaking, the role of the power adapter is a transformer and a rectifier. Household AC is 220v, and our computer ground is DC 12v (as if it is), so it is certain that the power adapter is a transformer and rectifier. The adapter is a transformer, so we should all know that AC 220v is transformed through the transformer and 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. Component damage, etc. By the way, the function of the adapter is to convert the alternating current into the direct current of the electronic products. The power adapters with large space are generally built-in. Generally, the adapters are not small in size, and the small-sized machines are external. In order to save space, two It is also easy to replace. The mains power used by the adapter is relatively high, and it is dangerous to put the power adapter inside the machine.

　　Points to note when using the power adapter

　　There are generally several items that need attention on the label of the power adapter (hereinafter referred to as the adapter).

　　First, it is the model of the adapter. For example, the model of this adapter is XVE-120100. It tells us several information, that is, its manufacturer, wattage, etc. The beginning of XVE is generally ##company code, and 120100 means this The adapter is 12W, and the 050200 is the second of 10W. It is the INPUT (input) of the adapter, which is generally 100-240V~50-60Hz in China, which means that the adapter can work normally under the voltage of 100V-240V The third is the OUTPUT (output) of the adapter. Two numbers can quickly calculate the wattage of the adapter. For example, in this adapter, the voltage is 12V*current 1A=12W (power), indicating that the power supply is a 12W adapter.

　　Most laptop power adapters are suitable for 100-240V AC (50/60Hz). Basically, most laptops have an external power supply and use a power cord to connect with the host, which can reduce the size and weight of the host. Only a few models have the power supply built into the host.

　　There is a nameplate on the power adapter, which indicates the power, input and output voltage and current, etc., pay special attention to the range of the input voltage, this is the so-called "travel power adapter", if you go to a country where the mains voltage is only 110V This feature is very useful. Some parallel notebook computers are only sold in the country of origin. There is no such compatible voltage design, or even a single input voltage of 110V, which will burn when plugged in under the 220V mains voltage in my country.

　　Summarize

　　The function of the power adapter is to convert the high voltage in the 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 some issues that need to be paid attention to when using the power adapter.

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