Transformers In electrical equipment and wireless circuits, transformers are often used for voltage rise and fall, impedance matching, and safety isolation. In a generator, whether the coil moves through the magnetic field or the magnetic field moves through the fixed coil, an electric potential can be induced in the coil. In both cases, the value of the magnetic flux remains unchanged, but the amount of magnetic flux that intersects the coil is different. Change, this is the principle of mutual induction. A transformer is a device that uses electromagnetic mutual induction to transform voltage, current and impedance. In its most basic form, a transformer consists of two sets of coils wound with conductors that are inductively coupled to each other.

Most transformers have a fixed iron core on which primary and secondary coils are wound. Due to the high magnetic permeability of iron materials, most of the magnetic flux is confined in the iron core, so the two sets of coils can obtain a relatively high degree of magnetic coupling. In some transformers, the coil and the core are tightly coupled, and the ratio of the primary and secondary voltages is almost the same as the coil turns ratio of the two. Therefore, the turns ratio of the transformer can generally be used as a reference index for the step-up or step-down of the transformer. Because of this step-up and step-down function, the transformer has become an important accessory of the modern power system. Increasing the transmission voltage makes long-distance power transmission more economical. As for the step-down transformer, it makes the power application more diversified and can In this way, without transformers, the industry cannot achieve the status quo of development.