Composition and application of power adapter (working principle of power adapter)Power adapters are commonly used in small electronic products such as mobile phones, liquid crystal displays and laptops. It is generally composed of shell, power transformer and rectifier circuit. According to its output type, it can be divided into AC output type and DC output type; According to the connection mode, it can be divided into wall type and desktop type.
It is widely used in telephone mother machine, game machine, language repeater, Walkman, notebook computer, cellular phone and other equipment.
Power adapter for computer
Power adapters are widely used in industrial automation control, military equipment, scientific research equipment, LED lighting, industrial control equipment, communication equipment, power equipment, instruments and meters, medical equipment, semiconductor refrigeration and heating, air purifiers, electronic refrigerators, liquid crystal displays, LED lamps, communication equipment, audio-visual products, security, computer chassis, digital products and instruments, And it plays an important role in these fields. What are the functions of the power adapter?
Function of power adapter
Generally speaking, the function of power adapter is transformer and rectifier. Household AC is 220V, and our computer land is 5v 20a dc power supply, so we can be sure that the power adapter is a transformer and rectifier. If the adapter is a transformer, we should all know that AC 220V is transformed into voltage through the transformer and DC through the rectifier. There is consumption here, and these consumption will be transformed into heat, so it is normal for the power adapter to heat.
The transformer is made of silicon steel sheet. After the transformer is powered on, magnetic flux will be generated. The magnetic flux will cause the force between silicon steel sheets to produce buzzing sound, which is normal. But the earth sound is abnormal for many reasons: 1. The AC voltage is unstable. 2. The chip is broken. 3. Turn to turn short circuit. 4. Component damage, etc. By the way, the function of the adapter is to convert alternating current into direct current
Power adapters with large space are generally built-in. Generally, the size of the adapter is not small. Machines with small volume are external. In order to save space, it is also convenient to replace. The mains power used by the adapter is relatively high, and it is dangerous to put it inside the machine.
Some problems needing attention in using power adapterThere are several items that need attention on the label of the power adapter (hereinafter referred to as adapter).
First, the model of the adapter. For example, the model of the adapter is xve-120100, which tells us several information, such as its manufacturer and wattage. The beginning of xve is generally the ## company code, 120100 means that the adapter is 12W, and 050200 means 10W;
Second, it is the input of the adapter, which is generally 100-240V ~ 50-60Hz in China, which shows that the adapter can work normally under the voltage of 100v-240v;
Third, the output of the adapter. The two numbers can quickly calculate the wattage of the adapter. For example, the voltage of the adapter is 12V * the 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 AC (50 / 60Hz). Basically, most laptops have an external power supply and are connected to the host with a power cord, which can reduce the volume and weight of the host. Only a few models have a built-in power supply in the host.
There is a nameplate on the power adapter, which indicates the indicators such as power, input and output voltage and current. Pay special attention to the range of input voltage. This is the so-called "travel power adapter". This feature is very useful if you go to a country where the mains voltage is only 110V. Some parallel laptops are sold only in the country of origin, Without this compatible voltage design, even a single input voltage of 110V will burn out if it is inserted under the 220V mains voltage in China.
summary
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 paper mainly introduces the function, composition and application of power adapter, as well as some problems needing attention when using power adapter.
