Switching power supply transformer combined magnetic core

Abstract

The invention relates to a switching power supply transformer combined magnetic core which comprises two or more first magnetic core bodies and one or more second magnetic core bodies. The section area of synthesis magnetic circuit magnetic bodies of the second magnetic core bodies is two or more times that of synthesis magnetic circuit magnetic bodies of the first magnetic core bodies. The size of magnetic columns of the second magnetic core bodies is twice that of magnetic columns of the first magnetic columns, and the magnetic columns of the second magnetic core bodies are symmetrically distributed on the two sides of the magnetic bodies of the magnetic core bodies. The magnetic columns on the two sides of the second magnetic bodies are not equal in length, and then winding windows on the two sides of the magnetic bodies are not equal in size. Primary windings or secondary windings of a transformer are wound around central magnetic columns of the first magnetic core bodies and the second magnetic core bodies respectively. By means of the switching power supply transformer combined magnetic core, the primary windings and the secondary windings of the transformer are completely insulated and isolated from each other, the problem that primary windings or secondary windings of a transformer of a conventional process are dual insulated and the problem that bad influences are caused by distributed capacitance of the transformer of the conventional process are solved, and the power supply transformer is low in leakage inductance and high in transmission efficiency.

Description

technical field [0001] The invention relates to a magnetic core of a switching power supply transformer, in particular to a magnetic core suitable for series-parallel connection between a plurality of windings of the transformer. Background technique [0002] At present, most transformers in switching power supplies use image 3 As shown in the conventional structure, the magnetic core of the transformer is composed of the magnetic cores 27 and 28 of the upper and lower halves and three magnetic columns facing each other. They are all wound in the winding slots of the skeleton 32 along the parallel direction of the magnetic column. The primary winding 29 and the secondary winding 30 are insulated and isolated with insulating tape 31. At least one of the primary winding 29 and the secondary winding 30 must have three layers of windings. Winding insulating wires or adding insulating tapes for retaining walls on both sides of the windings to meet the requirements of the safety...

AI Technical Summary

Problems solved by technology

[0004] In view of this, the present invention provides a magnetic core that can meet the insulation and efficiency requirements of switching power supply transformers, and solves the problems of high distributed capacitance, complex winding process, difficulty in meeting safety distance and double insulation requirements, and low transmission efficiency of existing switching power supply transformers. The problem

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