Magnetic core assembly for high-frequency transformer and high-frequency transformer

Abstract

The invention provides a magnetic core assembly for a high-frequency transformer. The magnetic core assembly comprises a magnetic core main body and an auxiliary magnetic core body, wherein the magnetic core main body is connected with the auxiliary magnetic core body and is matched with the auxiliary magnetic core body to form a closed magnetic circuit without an air gap, and the magnetic conductivity of the magnetic core main body is larger than that of the auxiliary magnetic core body. A magnetic material with relatively low magnetic conductivity is used for replacing an air gap, and due tothe fact that no air gap exists in the whole magnetic circuit, dispersed and leaked magnetic flux of the air gap is thoroughly eliminated, air gap dispersed and leaked magnetic flux eddy current lossin high-frequency application is eliminated, the efficiency of a transformer is effectively improved, and the operation temperature rise is reduced.

Description

technical field [0001] The invention relates to the field of magnetic cores, in particular to a high-frequency transformer magnetic core assembly and a high-frequency transformer. Background technique [0002] In high-frequency transformers, in order to meet the requirements of energy storage, suppression of magnetic core saturation, or adjustment of inductance, it is usually necessary to open one or more air gaps on the magnetic core. Although the increase of the air gap in the magnetic core meets the above design requirements, it also has the following disadvantages: the magnetic flux at the air gap leaks, passes through the adjacent windings, and generates high-frequency eddy current losses in the windings. This additional eddy current loss increases the power dissipation of the transformer, increases the operating temperature rise, and reduces the efficiency of the transformer. As the switching frequency increases, the additional high-frequency eddy current losses near ...

AI Technical Summary

Problems solved by technology

Although the increase of the air gap in the magnetic core meets the above design requirements, it also has the following disadvantages: the magnetic flux at the air gap leaks, passes through the adjacent windings, and generates high-frequency eddy current losses in the windings

The usual way to solve the additional loss of the air gap is to replace the large air gap with multiple small air gaps. Although this method can reduce the air gap, the additional loss caused by the leakage magnetic flux cannot be eliminated, and it also increases the complexity of the transformer production process.

In addition, small changes in the air gap have a significant impact on the working flux and inductance of the transformer. Because the air gap accuracy of the magnetic circuit air gap processing and assembly process is not easy to control, it often leads to large dispersion of the magnetic circuit parameters.

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