Power adapter is not big, but it contains the knowledge is too much, in the past always give you some of the power adapter to explain the common knowledge or problems, those are very common, and today we come to tell you a Chat adapter some popular knowledge, in order to strengthen everyone on the power adapter all-round understanding, then we take a look at what they have little secret:


First, the "power input isolation transformer" is actually the power input access to an isolation transformer
Power input isolation transformer, the term seems to be very tall, and often let some begin to contact the electronic engineering technology to learn the new engineers are unable to start. In fact, the meaning of the noun behind, refers to the output of the power supply access to an isolation transformer, in the final analysis of this definition is mainly on the isolation transformer to understand the expansion. In the power input access to an isolation transformer, the isolation transformer primary coil isolation, which can protect the power system safe operation. This is also the main function of the power input isolation transformer. Generally speaking, isolation transformers are mostly suitable for transmission range is small, the line short power supply range. At present, many electrical appliances are directly connected to the 220V utility power grid, the use of electrical appliances is a low voltage, it needs through the power transformer for buck. If you do not use the isolation transformer may be the risk of electric shock, therefore, in the power input access to an isolation transformer, can effectively protect the safe operation of electrical appliances.
Second, low-frequency transformers and high-frequency transformer test is not the same
In the application of power transformers, according to the different operating frequency to the transformer product division, usually can be divided into low-frequency transformers and high-frequency transformer two. Although the two work is the same, but in fact, low-frequency transformers and high-frequency transformer test principle is not the same. In the process of testing, low-frequency transformer can be directly on the AC power transformer, which test the project is mainly the output voltage and related parameters. Including no-load input current, no-load output voltage, with input current, load output voltage, efficiency and pressure level. 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 test content, including inductance, leakage inductance, turns ratio and pressure level.
Third, the current market, the common audio power transformers are basically ring transformers
Audio power transformers and ordinary power transformers can be replaced with each other? The answer is of course: no. Currently on the market common impression of power transformers, in fact, most of them are ring-type transformers. In practical applications, the toroidal transformer is often called "ring cattle", this form of the transformer easy to install, conversion efficiency is also high, but also has a small magnetic leakage characteristics. In terms of weight, the toroidal transformer can be reduced by half than the weight of the cascade transformer, and the cost of the conventional square transformer is low. In the manufacturing process, the winding is tightly wrapped around the ring core, effectively reducing the magnetostriction Noise, but also conducive to heat. The reason why the switching power supply transformer can not be used in the audio power, because the switching power supply is too high frequency interference is too serious, will greatly affect the sound quality.