What is a power adapter? What are the functions?

I don't know what adapter you're talking about?

The adapter is a kind of accessory that plays the role of intermediate connection, and the purpose of using this accessory is to simplify the hardware design of the host and increase the versatility and flexibility of the host.

Let's take an example: the graphics card is the most used adapter, because we can see too many types of displays, their resolution and refresh rate will be different, if the display output port on the motherboard is prepared for various types of displays with different output signals, then I am afraid that this circuit board will be larger than the motherboard, and this motherboard can be used with several types of displays at most in a lifetime, and the excess is wasted, so people reached a consensus: the motherboard only provides a display interface, The specific display type is a separate display card to form a hardware connection form of the motherboard graphics card display, which not only saves the circuit of the motherboard, but also adapts to the needs of the display by replacing the graphics card as needed.

This graphics card is also known as a graphics card.

Commonly used adapters include power adapters, network card adapters, network adapters, and print adapters. Wait a minute.

The respective explanations are as follows:

1. The power adapter is a device that outputs 220 volt alternating current through voltage transformation, rectification, filtering, and voltage stabilization, and is suitable for the working power supply of electrical appliances.

2. The function is to provide the voltage, current and stability required by the electrical appliances, so that the corresponding electrical appliances can work safely and stably. It is widely used in portable electronic devices and electrical appliances.

3. Without the power adapter, the electrical appliance cannot work.

The power adapter is a power conversion device for small portable electronic equipment and electronic appliances, which is generally composed of shells, transformers, inductors, capacitors, control ICs, PCB boards and other components.

Its working principle is converted from AC input to DC output; According to the connection method, it can be divided into wall type and desktop type. It is widely used in security cameras, set-top boxes, routers, light bars, massagers and other equipment.

Usage: Generally speaking, the power adapter is used as a transformer and rectifier. The household AC is 220V, while our computer is 12V. Therefore, it is certain that the power adapter is a transformer and rectifier. The adapter is a transformer.

The working principle of the power adapter is to use the unstable power supply to use the switching power supply, and turn it into the constant voltage direct current required by the object through the conversion circuit to supply and charge the object. This kind of conversion circuit must have a protection circuit.

Power adapters are commonly found on small electronics such as mobile phones, LCD monitors, and laptops. Generally, it is composed of a shell, a power transformer and a rectifier circuit, which can be divided into AC output type and DC output type according to its output type, and can be divided into wall plug-in type and desktop type according to the connection mode.

The laptop power adapter circuit is actually simple, the key is to understand the principle, come here to see.

1. Turn 220V alternating current into a low-voltage alternating current through a lowering transformer. 2. With 4 diodes, the unidirectional conductivity of the diodes is used to turn the alternating current into direct current (the magnitude is varied). 3. Use capacitor filtering to change the DC current with varying magnitude into constant DC current.

It's just a little transformer.

There are two types of power adapters:

1. A simple transformer, some have a certain voltage stabilization function, and the output is AC.

This type of appliance has a rectifier circuit inside.

2. Transformer voltage stabilization plus rectification, and the output is DC.

Such appliances do not have rectifier circuits. The adapter in 1 is not available.

As for the principle, it is nothing more than two types: transformer and switching power supply. Of course, there are also capacitor voltage dividers that are super cheap.

Do your own online search to be specific.

How does the power adapter work? 1. Reduce the voltage of the 220V AC power supply to a suitable voltage. 2. The low voltage after the step-down is rectified, and the alternating current becomes pulsating direct current. 3. Turn the pulsating DC into a straight DC with capacitor filtering.

The power adapter functions as a transformer and rectifier. The AC power for the home is 220V, while the DC 12V for the computer (as if it were), so it is certain that the power adapter is a transformer and rectifier. Then the adapter is a transformer, AC 220V transforms voltage through the transformer, and DC through the rectifier, there is consumption here, and these 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, and after the transformer is energized, it generates magnetic flux, which will cause the silicon steel sheets to produce forceful action, resulting in a humming sound, which is normal. However, the sound of the earth is not normal, and the reason is generally that the alternating current voltage is unstable; Chip breakage; inter-turn short circuit; Damaged components.

Power adapter, also known as external power supply, is a small portable electronic equipment and electronic appliances power supply conversion equipment, generally composed of shell, power transformer and rectifier circuit, according to its output type 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 sub-parent machines, game consoles, language repeaters, walkmans, laptops, cellular and other equipment.

There is a nameplate on the power adapter, which indicates the 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, this feature is very useful, some parallel laptops are only sold in the country of origin, there is no such compatible voltage design, and even only a single input voltage of 110V, which will burn out when plugged in at 220V mains voltage.