Ferrite core for high-frequency transformer

Abstract

The invention discloses a ferrite core for a high-frequency transformer. The ferrite core is characterized by comprising a columnar ferrite core (1) on which two grooves are cut along the circumferential direction, wherein two coil windings which are used as a primary coil (3) and a secondary coil (4) of the transformer are wound in the two grooves; and a magnetized columnar permanent magnetic ferrite sheet (2) is adhered to one end of a magnetic core in a shape like a Chinese character 'wang'. Part of the magnetic field generated by direct current in the windings of the high-frequency transformer is counteracted by the magnetic field generated by the permanent magnetic ferrite core, so that higher direct current can pass through the windings of the high-frequency transformer; and by the method, superposition property of the direct current of the high-frequency transformer can be greatly improved, so that higher direct current can pass through the high-frequency transformer.

Description

technical field [0001] The invention relates to a ferrite core, in particular to a ferrite core for a high-frequency transformer. Background technique [0002] At present, ferrite cores are commonly used as high-frequency electronic transformers in high-frequency electronic circuits. With the rapid development of electronic technology, electronic components are required to continue to develop in the direction of miniaturization and high power. In order to meet this development demand, high The DC current allowed to pass through the high-frequency transformer is getting larger and larger, which often leads to a significant drop in the winding inductance of the high-frequency transformer, thus making the high-frequency transformer unable to work normally. In order to prevent the occurrence of magnetic saturation, it is necessary to improve the DC superposition characteristics of the high-frequency transformer. The traditional method is to open an air gap in the magnetic circui...

AI Technical Summary

Problems solved by technology

[0002] At present, ferrite cores are commonly used as high-frequency electronic transformers in high-frequency electronic circuits. With the rapid development of electronic technology, electronic components are required to continue to develop in the direction of miniaturization and high power. In order to meet this development demand, high The DC current allowed to pass through the high-frequency transformer is getting larger and larger, which often leads to a significant drop in the winding inductance of the high-frequency transformer, so that the high-frequency transformer cannot work normally.

In order to prevent the occurrence of magnetic saturation, it is necessary to improve the DC superposition characteristics of the high-frequency transformer. The traditional method is to open an air gap in the magnetic circuit of the magnetic core, or simply make the ferrite core an open magnetic circuit. Although this method is To a certain extent, the DC superposition characteristics of high-frequency transformers can be improved, but the degree of improvement is very limited, especially for ferrite cores working under high-frequency conditions, NiZn ferrite materials are often used, and NiZn ferrite materials are due to The saturation magnetic flux density is low, and saturation magnetization is easy to occur, so that the inductance of the transformer winding drops sharply, which will make the electronic equipment not work properly, or even burn out

Therefore, for high-frequency transformers operating with large DC current components, only using an open magnetic circuit cannot greatly improve the DC superposition characteristics of high-frequency transformers.

Images