What is the principle of transformer voltage transformation?

乱世煮酒论天下

What is the principle of transformer voltage transformation? [Copy link]

TINA-TI is used to simulate the transformation process of a non-ideal transformer. VG1 is the input waveform, OUT1 is the primary side or the input waveform, OUT2 is the secondary side output waveform, and the secondary side load is a resistor. Can it be understood that in a non-ideal transformer, only when the magnetic flux changes, the secondary side will generate induced magnetic flux and induced voltage, but if the magnetic flux remains unchanged for a long time, no induced voltage will be generated on the secondary side. It can also be said that when the magnetic flux remains unchanged, the induced voltage is generated only by the residual magnetism?

maychang

[Can it be said that when the magnetic flux remains unchanged, the induced voltage is generated only by the residual magnetism? ]

This is absolutely not the case. [Remanent magnetism] does not change, so no induced voltage (or more precisely, induced electromotive force) will be generated.

maychang

[Only when the magnetic flux changes, the secondary side will generate induced magnetic flux and induced voltage]

There is something wrong with this sentence. The first "magnetic flux" and the second "magnetic flux" are the same thing. In other words, there is only one magnetic flux in the magnetic circuit (not necessarily with an iron core), not one generated by the primary side and one by the secondary side as you might imagine.

maychang

[If the magnetic flux remains constant for a long time, no induced voltage will be generated on the secondary side]

If you remove the "when the time is long", the sentence is correct. Before removing it, it is nonsense.

maychang

[What is the principle of transformer voltage transformation? ]

The working principle of the transformer can be expressed in two simple sentences: current generates magnetic field, and the changing magnetic field generates induced electromotive force. Of course, voltage, electromotive force and current obey Ohm's law and Kirchhoff's law.

吾妻思萌

The voltage on the secondary side is the magnetic field generated by the alternating current.

haoayou

The total magnetic flux on the core of a transformer is the same at any time, and the changes produced are also the same. Different numbers of turns produce different voltages N*Uin.