The main parameters of transformer are voltage ratio, rated power, frequency characteristics, efficiency and so on.
(1) Voltage ratio (n) is the relationship between the number of turns of primary (primary) and secondary (secondary) windings and voltage: n=V1/V2=N1/N2, the voltage ratio of boost transformer is less than 1, the voltage ratio of step-down transformer is greater than 1, and the voltage ratio of isolation transformer is equal to 1.
(2) Rated power is generally used for power transformers. It refers to the power transformer in the specified working frequency and voltage, can work for a long time without exceeding the specified temperature output power. The rated power of the transformer is related to the cross-sectional area of the core and the diameter of enameled wire. Transformer core cross-sectional area, enameled wire diameter thick, its output power is also large.
(3) frequency characteristics refers to the transformer in a certain operating frequency range, different operating frequency range of transformers, generally can not be used interchangeably. Because the transformer works outside its frequency range, there will be temperature rise or can not work normally.
(4) Efficiency refers to the ratio of transformer output power to input power at rated load. The value is proportional to the output power of the transformer, that is, the greater the output power of the transformer, the higher the efficiency; The smaller the transformer's output, the less efficient it is. The efficiency of small power transformer is generally 60%~90%.
4. Label the transformer
Except for power transformers, most of the other transformers are not required to do a clear label, power transformers are generally directly marked with input, output pins and voltage

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