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What is a power adapter?Linear Power Adapter

source:power adapter     Popular:adapter     release time:2022-02-15 09:04:18     Article author:sznbone    

  What is a power adapter?Linear Power Adapter(图1)

  The power adapter is a power supply conversion device for small portable electronic equipment and electronic appliances. It is generally composed of a shell, a power transformer and a rectifier circuit. According to its input type, it can be divided into AC power adapter and DC power adapter; according to the connection method, it can be divided into wall plug Type power adapter and desktop type power adapter. It is widely used in the equipment such as telephone handsets, game consoles, language repeaters, walkmans, notebook computers, and cellular phones.

  How to repair the power adapter if it is broken?

  1. If there is a problem with the original adapter that cannot be repaired or is too late to repair, you can use another adapter to replace it first. As long as the output voltage and power are roughly equivalent. There is a voltage regulator circuit inside the laptop power adapter, so don't worry too much about the output voltage mismatch. When repairing, the first step is to prepare tools. We need a multimeter, screwdriver, and welding tools.

  2. There are four plastic caps on the power adapter. Do not damage the adapter shell as much as possible. After the shell is damaged, electromagnetic radiation will increase and other problems will affect the stability of the machine. If the shell is damaged, try to repair it. If the external power supply does not supply power during the disassembly process, you can plug in the battery and try. If the machine can start normally, there may be a problem with the power cord or adapter. After opening the appearance and opening the shielding layer, it is best to check the solder feet first and observe with naked eyes. The circuit is intermittent, usually due to poor contact. Then check with a multimeter to find out if there is any problem with the power cord.

  3. During the test, if the resistance pin is found to be soldered, use a welding tool to repair it, install the power adapter, start the test, and solve the problem. It should be noted that if there is a problem with a certain capacitor during the testing process, you can buy a capacitor with the same model and capacity, remove the problematic capacitor, and solder the new capacitor on. If you find that there is a problem with the IC power cord, you can also solve it in the same way. Of course, since the IC chip is definitely one of the most important electronic components in the power adapter, the capacitance is too complicated.

  4. Since the current power adapter has adopted a large number of SMD components, once the component has a problem, the maintenance is even more difficult. The power of the power adapter is increasing day by day, and the test of the electronic components is getting greater and greater. If the quality of the electronic components used in the power adapter is not good enough, and the PCB wiring is improper, it is likely to increase the probability of failure. Therefore, it is very important to buy a good quality power adapter!


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