Power adapter little-known "secret"!

Power input isolation transformer, this term seems to be very lofty, but also often let some new engineers just start to learn electronic engineering technology feel at a loss. In fact, the meaning behind the term refers to the connection of an isolating transformer at the output end of the power supply, and in the final analysis, the definition is mainly an extended understanding of the isolating transformer. After an isolation transformer is connected to the power input terminal, the primary coil of the isolation transformer is isolated, so as to ensure the safe operation of the power system. This is also the main role of the power input isolation transformer. Generally speaking, isolation transformer is mostly suitable for small transmission range, short line power supply range. At present, many electrical appliances are directly connected to the 220V mains power grid. Electrical appliances use low voltage, so they need to be depressurized through the power transformer. If the isolation transformer is not used, there may be a risk of electric shock. Therefore, access to an isolation transformer at the power input end can effectively ensure the safe operation of electrical appliances.

Two, low frequency transformer and high frequency transformer test is not the same

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

Three, at present, the common sound power transformer on the market is basically ring transformer

Can the audio power transformer be replaced with the ordinary power transformer? The answer, of course, is no. At present, the most common impression power transformer on the market, in fact, most of them are ring transformers. In practical application, annular transformer is often called "ring cow", this form of transformer is easy to install, conversion efficiency is also very high, but also has the characteristics of small magnetic leakage. In terms of weight, the weight of the ring transformer can be reduced by half than that of the laminated transformer, and the cost is lower than that of the ordinary square transformer. In terms of the production process, the winding evenly tightly wraps the ring core, effectively reduces the noise caused by magnetostriction, and is conducive to heat dissipation. And the reason why the switching power transformer can not be used in the sound power supply, because the high frequency interference of the switching power supply is too serious, will greatly affect the sound quality.