CN204926990U

CN204926990U - a switching transformer

Info

Publication number: CN204926990U
Application number: CN201520383722.XU
Authority: CN
Inventors: 郑敏华
Original assignee: Zhejiang Wanli College
Current assignee: Zhejiang Wanli College
Priority date: 2015-06-04
Filing date: 2015-06-04
Publication date: 2015-12-30
Anticipated expiration: 2025-06-04

Abstract

The utility model provides a switching transformer, which comprises a ferrite core, four 1/4 primary coils and secondary coils; the four 1/4 primary coils and the secondary coils are all wound On the ferrite core, and the four 1/4 primary coils are separated from the secondary coils by an insulating material; the four 1/4 primary coils are connected end to end. The switching transformer provided by the utility model comprehensively considers the working factors affecting the performance of the switching transformer, re-designs the winding process, and adopts a four-layer primary coil, thereby effectively improving the skin effect, proximity effect and leakage of the switching transformer. Inductive problem, improve the overall performance of the switching transformer.

Description

A kind of switch transformer

Technical field

The utility model belongs to technical field of electricity, is specifically related to a kind of switch transformer.

Background technology

Along with the development in epoch and the progress of technology, various electric equipment gets more and more, the Switching Power Supply of powering for these electric equipments is also more and more extensive, and present Switching Power Supply progressively instead of traditional linear power supply, and Switching Power Supply works mostly under the high frequency state of ten thousand KHz.The core of Switching Power Supply is switch transformer, and the performance of Switching Power Supply depends on the performance of switch transformer.

High frequency switch transformer needs in the face of following problem: 1, kelvin effect: can produce alternating magnetic field when high-frequency current flows through wire, according to electromagnetic induction principle, alternating magnetic field produces eddy current in conductor, makes alternating current tend to conductive surface, and the effective conductive area of wire reduces; 2, proximity effect: when high-frequency current flows through two wires, two wires are all in the magnetic field of high-frequency current generation of adjacent conductor, same, can produce eddy current, force current in wire towards in adjacent wires set of surfaces in wire; 3, leakage inductance: if the magnetic linkage that produces of coil only some and another one coil chain closes, can not while the chain magnetic linkage that closes two coils be called interlinked leakage, the inductance of correspondence is called leakage inductance.

Switch transformer many employings parallel winding of multiple coils mode overcomes the kelvin effect of high-frequency current, but parallel winding of multiple coils mode can make again proximity effect rise at double, so adopt the mode of coil grading coiling to offset proximity effect.Therefore traditional switch transformer all adopts the mode coiling shown in Fig. 1.In FIG, traditional switch transformer comprises: magnetic core 10; Secondary coil 30; And two 1/2 primary coils, that is, the one 1/2 primary coil the 20 and the 2 1/2 primary coil 40.The switch transformer of this winding method is adopted to reduce kelvin effect because primary coil adopts stranded conductor, but number of primary turns is more, even if be divided into two-layer coiling, every layer of superposition also having a multi cord, thus cause proximity effect obvious, affect the performance of switch transformer, although inner coil is identical with the outer coil number of turn simultaneously, length is different, and D.C. resistance is also different, two coils are not quite identical, more obvious on the impact of AC resistance thus.Therefore urgently there is a kind of switch transformer that effectively can improve the problem about kelvin effect, proximity effect and leakage inductance.

Utility model content

One of the utility model object is to provide a kind of high performance switch transformer, and this switch transformer effectively can overcome the impact on switch transformer performance of kelvin effect, proximity effect and leakage inductance.

The utility model adopts following technical scheme to achieve these goals:

The utility model provides a kind of switch transformer, and this switch transformer comprises FERRITE CORE, four 1/4 primary coils and secondary coils; Described four 1/4 primary coils and described secondary coil are all wound in described FERRITE CORE, and are separated by insulating material between described four 1/4 primary coils and described secondary coil; Described four 1/4 primary coil head and the tail connect.

Further, described FERRITE CORE is E type ferrite magnetic core.

The beneficial effects of the utility model are, switch transformer of the present utility model considers for the duty cycle of the performance affecting switch transformer, re-start technique for coiling design, have employed the primary coil of four-layer structure, thus effectively can improve the problem of switch transformer about kelvin effect, proximity effect and leakage inductance, improve the combination property of switch transformer.

Accompanying drawing explanation

Figure 1 shows that the structural representation of the switch transformer of prior art.

Figure 2 shows that the structural representation of switch transformer of the present utility model.

Figure 3 shows that the winding diagram of the switch transformer of the present utility model shown in Fig. 2.

Embodiment

Hereafter will describe the utility model in detail in conjunction with specific embodiments.It should be noted that the combination of technical characteristic or the technical characteristic described in following embodiment should not be considered to isolated, they can mutually be combined thus be reached better technique effect.

Switch transformer of the present utility model is described in detail below in conjunction with accompanying drawing.

As shown in Figure 2, switch transformer of the present utility model mainly comprises: magnetic core 6; Four 1/4 primary coils, that is, the one 1/4 primary coil the 1, the 2 1/4 primary coil the 2, the 3 1/4 primary coil the 3 and the 4 1/4 primary coil 4; And secondary coil 5 forms.Magnetic core 6 adopts E type ferrite, and above-mentioned four 1/4 primary coils 1,2,3,4 and secondary coil 5 are all wound on E type ferrite core center post, are separated between secondary coil and primary coil by insulating material.

As shown in Figure 3, one end of one 1/4 primary coil 1 is as primary coil input, the other end of the one 1/4 primary coil 1 is connected with one end of the 4 1/4 primary coil 4, the other end of the 4 1/4 primary coil 4 is connected with one end of the 2 1/4 primary coil 2, the other end of the 2 1/4 primary coil 2 is connected with one end of the 3 1/4 primary coil 3, the other end of the 3 1/4 primary coil 3 is as primary coil another one input, thus, four 1/4 primary coils form a complete primary coil.

Principle of the present utility model is as follows: for common magnetic core, a coil is divided into N section and replaces coiling, and leakage inductance can reduce N in theory ², therefore can adopt multistage coil multistage layering winding method, adopt this layering cross winding not only can reduce leakage inductance, more proximity effect can be reduced, but after the number of plies is many, there is the problem making H value increase in the insulating barrier between coil and screen, also can have an impact to transformer performance.When amid all these factors, the utility model adopts the primary coil of four-layer structure, adopts the switch transformer of four layers of primary coil coiling effectively can improve the problem of switch transformer about kelvin effect, proximity effect and leakage inductance.

Although given embodiments more of the present utility model, it will be understood by those of skill in the art that when not departing from the utility model spirit herein, can change embodiment herein.Above-described embodiment is exemplary, should using embodiment herein as the restriction of the utility model interest field.

Claims

1. a switch transformer, is characterized in that, comprises FERRITE CORE, four 1/4 primary coils and secondary coils;

Described four 1/4 primary coils and described secondary coil are all wound in described FERRITE CORE, and are separated by insulating material between described four 1/4 primary coils and described secondary coil; Described four 1/4 primary coil head and the tail connect.

2. switch transformer as claimed in claim 1, it is characterized in that, described FERRITE CORE is E type ferrite magnetic core.