Working principle of transformer: Mainly apply the principle of electromagnetic induction to work.

Specifically: when an AC voltage U1 is applied to the primary side of the transformer, and the current flowing through the primary winding is I1, the current will generate alternating magnetic flux in the iron core, causing the primary winding and the secondary winding to electromagnetically communicate. According to the principle of electromagnetic induction , The alternating magnetic flux through these two windings will induce electromotive force, and its magnitude is proportional to the number of winding turns and the large value of the main magnetic flux. The side with more winding turns has a higher voltage, and the side with less winding turns The voltage is low. When the secondary side of the transformer is open, that is, when the transformer is unloaded, the voltage at the primary and secondary terminals is proportional to the number of turns of the primary and secondary windings, that is, U1/U2=N1/N2, but the primary and secondary frequencies remain the same, so Achieve voltage changes.

Expansion information:

Transformer (Transformer) is a device that uses the principle of electromagnetic induction to change the AC voltage. The main components are the primary coil, the secondary coil and the iron core (magnetic core). The main functions are: voltage transformation, current transformation, impedance transformation, isolation, voltage stabilization (magnetic saturation transformer), etc.

A transformer is a static electrical device. It is a device that converts a certain level of AC voltage and current into another level of voltage and current at the same frequency based on the principle of electromagnetic induction. Function: transform AC voltage, exchange AC current and transform impedance.

The number of turns of the two sets of transformers is N1 and N2 respectively, N1 is the primary and N2 is the secondary. An alternating voltage is applied to the primary coil, and an induced electromotive force is generated at both ends of the secondary coil. When N2>N1, its induced electromotive force is higher than the voltage applied by the primary, this kind of transformer is called a step-up transformer; when N2<N1, its induced electromotive force is lower than the voltage applied by the primary, this kind of transformer It is called a step-down transformer.