What Caused the Loss of the High Frequency Transformer?

What Caused the Loss of the High Frequency Transformer?

Transformer loss is a concept in the field of modern physics and refers to the sum of the no-load loss P and the short-circuit loss Pk. The no-load loss P refers to the active power absorbed by the transformer when the rated voltage is applied to one winding of the transformer while the remaining windings are open. What is the Short-circuit loss Pk? For a two-winding transformer, when the rated current is passed through one winding of the transformer, and the other winding is short-circuited, the active power absorbed by the transformer is called the short-circuit loss of the transformer; for the multi-winding transformer, the short-circuit loss is subject to the specified pair of windings.

The generation of transformer losses can be attributed to two main reasons:

First, a large number of copper wires are required to wind the transformer. These copper wires have a resistance. When the current flows, the resistor consumes a certain amount of power. This loss is often consumed as heat. This loss is called "copper loss."

Second, when the primary winding of the transformer is energized, the magnetic flux generated by the coil flows in the iron core. Since the iron core itself is also a conductor, an electric potential is induced on a plane perpendicular to the magnetic field line, and this potential is formed on the cross section of the iron core. The loop is closed and a current is generated, called "eddy current." This " eddy current " increases the loss of the transformer, causing the core of the transformer to heat up and the temperature of the transformer is increase. The loss caused by the "eddy current" is called "iron loss".

Therefore, the rise of the temperature of the transformer is mainly caused by iron loss and copper loss. Since the transformer has iron loss and copper loss, its output power is always less than the input power, and the efficiency η represents the relationship between output power and input power: η = output power / input power.

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