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    The little secret of the power adapter
    time:2019-07-05 10:01        Click volume:【143 】Times

    The power adapter doesn't look very big, but it contains too much knowledge. In the past, I always explained the common sense knowledge or problems of some power adapters. Those are very common. Let's talk to you today. Talk about some of the unpopular knowledge of adapters, so as to enhance everyone's understanding of the power adapter, then let's take a look at some of the little-known secrets:

    First, the "power input isolation transformer" is actually connected to an isolation transformer power input isolation transformer at the input of the power supply. This term seems to be very tall and often makes some new engineers who are just beginning to contact with electronic engineering technology feel Nothing to start with. 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 to understand the expansion of the isolation transformer. After an isolation transformer is connected to the power input end, the primary and secondary coils of the isolation transformer are isolated, thereby ensuring safe operation of the power supply system. This is also the main role of the power input isolation transformer. Generally speaking, the isolation transformer is mostly suitable for a power transmission range with a small transmission range and a short line. At present, many electrical appliances are directly connected to the 220V mains power grid, and the electrical appliances use low voltage, so it is necessary to step down through the power transformer. If you do not use an isolation transformer, there is a danger of electric shock. Therefore, an isolation transformer can be connected to the power input to ensure the safe operation of the appliance.

    Second, the low-frequency transformer and high-frequency transformer test method is different. In the application process of the power transformer, the transformer product is divided according to different working frequencies, usually can be divided into low-frequency transformer and high-frequency transformer. Although the working principle of the two is the same, in fact, the testing principle of the low frequency transformer and the high frequency transformer is different. During the test, 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, on-board input current, on-load output voltage, efficiency and withstand voltage. The high-frequency transformer needs to work with the circuit to work, so its test items are mainly related to the performance test. The main contents of the test include inductance, leakage inductance, turns ratio and withstand voltage.

    Third, the current common audio power transformers on the market are basically ring-shaped transformers, audio power transformers and ordinary power transformers can be replaced with each other? The answer of course is: no. At present, the common impression power transformers on the market are mostly ring-type 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 small 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, the winding evenly surrounds the toroidal core, effectively reducing the magnetostriction. Noise is also good for heat dissipation. The reason why the switching power supply transformer can not 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 sound.


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