First of all, from the power adapter concept first understand, it is small portable electronic equipment and electronic appliances power supply change equipment. Generally by the shell, transformer, inductor, capacitor, control IC, PCB board and other components combined. It works by converting AC input to DC output. Power adapter, commonly known as “external power supply”.

  What are the main types of power adapters?

  There are two main types of power adapters:

  1: switching power supply

  The main use of modern electronic technology, control the switching tube turn on and off time ratio, to maintain a stable output voltage of a power supply, power adapter switching power supply is generally composed of pulse width modulation (PWN) control IC and MOSFET.

  Advantages and disadvantages of switching power supply:

  Advantages: high efficiency, small size, can work in a wide voltage range.

  Disadvantages: greater circuit interference, more difficult to repair when a fault occurs.

  2: Linear power supply

  The alternating current through the transformer transformer, rectifier circuit rectifier filter to get unstabilized DC voltage, power adapter to achieve high precision DC voltage, must go through the voltage feedback circuit to adjust the output voltage.

  Advantages and disadvantages of linear power supply:

  Advantages: mature technology, simple circuit, and no switching power supply has the interference and noise.

  Disadvantages: the voltage feedback circuit is working in the linear state, the power consumption of the adjustment tube is large, the conversion efficiency is low, because of the use of inductive transformer, so the weight of the equipment is large.

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  In what fields are power adapters used?

  Power adapter is a kind of power supply product with quite common application. Its application areas have been widely supporting: security cameras, set-top boxes, routers, light bars, massage instruments, notebooks, printers and other types of electronic equipment. In the security industry and consumer electronics products, power adapters are especially widely used.

  In consumer electronics, adapters provide most of the output power within 100 watts, the market demand is growing rapidly. Applications such as battery chargers for electric bicycles, small-size LCD TVs, notebook computers, printers, DVD players and set-top boxes are all used. Most of the early power adapters use linear transformers, with the consumer electronics on the power adapter has a high efficiency, the input voltage range of the requirements, as well as the increase in the cost of copper, iron and manpower, these power adapters inside the original linear transformer most of the switching power supply is gradually replaced.

  What are the characteristics of the power adapter?

  1: can protect the computer during a power outage

  Power converter (both AC to DC), converted from alternating current to direct current, and then through the computer, it is not able to protect the computer, but the computer inside the storage of power storage (also known as the charger), so in the event of a power outage can protect the computer.

  2: Able to automatically detect 100--240V AC (50/60Hz)

  Power adapters are widely used in routers, telephone sub-masters, game consoles, language repeaters, walkmans, notebooks, cell phones and other devices. Most power adapters can automatically detect 100--240V AC (50/60Hz).

  3: Reduce the size and weight of the host

  Power adapter is a small portable electronic equipment and electronic appliances power supply power conversion equipment, it puts the power supply external, with a line and the host connection, so that can reduce the size and weight of the host, only a very few devices and appliances to the power supply built in the host.

  4: The “nameplate” of the power adapter

  Power adapter is composed of a power transformer and rectifier circuit, there is a nameplate on the power adapter, which indicates the power, input and output voltage and power flow and other indicators, which, in particular, should pay attention to the input voltage range.

  The above is for the concept of power adapter, types, applications and features to do one by one analysis.