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The little-known "secret" of the power adapter!

source:power adapter     Popular:adapter     release time:2021-09-01 10:35:41     Article author:sznbone    

  The power adapter looks small, but it contains too much knowledge. In the past, I always explained some common sense knowledge or problems of power adapters. Those are very common. Today we will talk to you. Let’s talk about some unpopular knowledge of adapters, so as to strengthen everyone’s comprehensive understanding of power adapters, so let’s take a look at what little-known secrets they have:

The little-known "secret" of the power adapter!(图1)

  1. "Power input isolation transformer" is actually an isolation transformer connected to the power input end

  Power input isolation transformer, the term seems to be very tall, and often makes some new engineers who are just beginning to learn about electronic engineering technology feel unable to start. In fact, the meaning behind this term refers to the connection of an isolation transformer at the output of the power supply. In the final analysis, this definition is mainly an extended understanding of isolation transformers. After an isolation transformer is connected to the power input terminal, the primary and secondary coils of the isolation transformer are isolated, which can ensure the safe operation of the power system. This is also the main function of the power input isolation transformer. Generally speaking, isolation transformers are mostly suitable for power supply ranges with small transmission ranges and short lines. At present, many electrical appliances are directly connected to the 220V mains power grid, and the electrical appliances use low voltage, so they need to be stepped down through a power transformer. If an isolation transformer is not used, there may be a risk of electric shock. Therefore, connecting an isolation transformer at the input end of the power supply can effectively ensure the safe operation of electrical appliances.

  2. The test methods of low-frequency transformers and high-frequency transformers are different

  In the application process of power transformers, transformer products are divided according to different operating frequencies, which can usually be divided into low-frequency transformers and high-frequency transformers. Although the working principles of the two are the same, in fact, the testing principles of low-frequency transformers and high-frequency transformers are different. In the process of testing, the low-frequency transformer can directly transform the alternating current. The items it tests are mainly the output voltage and related parameters. Including no-load input current, no-load output voltage, loaded input current, loaded output voltage, efficiency and withstand voltage, etc. The high-frequency transformer needs to cooperate with the circuit to work, so its test items are mainly related to the performance test. The main content of the test includes inductance, leakage inductance, turns ratio and withstand voltage.

  3. At present, the common audio power transformers on the market are basically toroidal transformers.

  Can audio power transformers and ordinary power transformers be used interchangeably? The answer is of course: no. At present, most of the common impression power transformers on the market are toroidal transformers. In practical applications, toroidal transformers are often called "ring cows". This type of transformer is easy to install, has high conversion efficiency, and has the characteristics of low magnetic leakage. In terms of weight, the toroidal transformer can be half the weight of the laminated transformer, and the cost is lower than that of the ordinary square transformer. In the manufacturing process, its windings evenly and tightly wrap the toroidal core, effectively reducing the magnetostriction caused by Noise is also conducive to heat dissipation. The reason why the switching power supply transformer cannot be applied to the audio power supply is because the high frequency interference of the switching power supply is too serious, which will greatly affect the sound quality of the audio.


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