CN201075328Y

CN201075328Y - Low leakage sensing voltage transformer

Info

Publication number: CN201075328Y
Application number: CNU2007200137813U
Authority: CN
Inventors: 杨玉岗
Original assignee: Individual
Current assignee: Individual
Priority date: 2007-08-09
Filing date: 2007-08-09
Publication date: 2008-06-18
Anticipated expiration: 2017-08-09

Abstract

The utility model pertains to a transformer, in particular to a low-leakage transformer, which consists of an iron core (1) and windings. The iron core (1) is provided with a plurality of iron core windows (3) and a plurality of shunting cylinders (2); the shunting cylinders (2) in the iron core windows (3) at one side or at both the left side and the right side are wound with a primary winding (6); each shunting cylinder (2) in every two adjacent iron core windows (3) is respectively wound with a secondary winding I (4) and a secondary winding II (5); the secondary winding I (4) and the secondary winding II (5) are connected in parallel to form a general secondary winding. The transformer adopting the iron core structure and the winding structure leads the primary winding to be only one circle in number, thus minimizing the leakage inductance of the transformer, reducing the voltage stress of a switching tube, reducing electromagnetic interference, ensuring the safe operation of a switch power supply, decreasing switching loss, improving the efficiency of the transformer and the switch power supply and saving energy.

Description

A kind of low-leakage inductance transformer device

Technical field

The utility model belongs to a kind of transformer, particularly a kind of low-leakage inductance transformer device.

Background technology

Advantages such as in recent years, Switching Power Supply is little, in light weight, low in energy consumption with its efficient height, volume, stability is high, dynamic corresponding is fast and being used widely.But along with improving constantly of switching frequency, the electromagnetic environment of power supply inside becomes increasingly complex, and the electromagnetic interference of Chan Shenging has a strong impact on the operate as normal of Switching Power Supply itself and peripheral electronic device thereof thereupon.Wherein, the leakage inductance as the transformer of Switching Power Supply core component is one of main source of electromagnetic interference.This is because the switching tube of Switching Power Supply when high speed turn-off, is understood the leakage inductance L at transformer _kLast generation induced electromotive force

e = - L_{k} \frac{di}{dt},

Be superimposed upon on the shutoff voltage of Transformer Winding, form the shutoff voltage spike, these due to voltage spikes not only cause electromagnetic interference, also can cause the voltage stress of switching device to increase, weight person's possibility breakdown switch pipe, influence the safe operation of Switching Power Supply, and increase switching loss, reduce the efficient of Switching Power Supply.In the past, the method that people reduce leakage inductance has following several usually: 1, under the prerequisite that volume of transformer allows, increase area of core section reducing umber of turn, this is because square being directly proportional of the leakage inductance of transformer and umber of turn; 2, adopt flat surface transformer; 3, reduce insulation thickness between the winding of former and deputy limit; 4, increase the winding height; 5, adopt the staggered coiling of former and deputy limit winding.Wherein, first method is the effective method that reduces leakage inductance, but in the past owing to be subjected to the restriction of the volume of transformer and the turn ratio, the minimizing of umber of turn is limited.Therefore, the leakage inductance that reduces transformer is very important.

Summary of the invention

The purpose of this utility model is to overcome above-mentioned technical deficiency, provide a kind of enforcement convenient, the realization umber of turn minimizes, and makes leakage inductance become square multiple and the order of magnitude to reduce, and is applicable to the low-leakage inductance transformer device of various power transformers, high-frequency switch power transformer and various flat surface transformers.

The technical scheme that the utility model technical solution problem adopts is: a kind of low-leakage inductance transformer device of being made up of unshakable in one's determination and winding, be characterized on iron core, being provided with a plurality of windows unshakable in one's determination and a plurality of magnetic post along separate routes unshakable in one's determination, be wound with former limit winding on the shunt magnetic post a plurality of unshakable in one's determination in the window unshakable in one's determination of an and arranged on left and right sides or a side, be wound with secondary winding one and secondary winding two respectively on each the shunt magnetic post unshakable in one's determination between adjacent two window unshakable in one's determination, secondary winding one and secondary winding two are connected in parallel as total secondary winding; Window unshakable in one's determination is made " fourth " font and is formed a plurality of magnetic posts along separate routes unshakable in one's determination, and former limit winding is placed on homonymy unshakable in one's determination with the end of secondary winding one, secondary side winding two or tosses about or become an angle of 90 degrees placement, interlaced coiling.

The beneficial effects of the utility model are: because above-mentioned core construction of transformer adopting and winding construction, make that former limit umber of turn is minimum to have only a circle, the effective turn of secondary winding is fractional turns (less than a circle), has realized minimizing of transformer leakage inductance, thereby reduces the shutoff voltage spike of switching tube in the Switching Power Supply, reduce the voltage stress of switching tube, reduce electromagnetic interference, guarantee the safe operation of Switching Power Supply, and reduce switching loss, improve the efficient of transformer and Switching Power Supply, energy savings.

Description of drawings

Specify with embodiment below in conjunction with accompanying drawing.

Fig. 1 shows a kind of low-leakage inductance transformer device structure master schematic diagram.

The structural perspective of the low-leakage inductance transformer device of the embodiment two of Fig. 2 diagrammatic sketch 1.

Among the figure, the 1-iron core; 2-magnetic post along separate routes unshakable in one's determination; 3-window unshakable in one's determination; 4-secondary winding one; 5-secondary winding two; The former limit of 6-winding; 7-loam cake unshakable in one's determination; The 8-arrow;

Embodiment

Embodiment one: with reference to accompanying drawing 1, a kind of low-leakage inductance transformer device, form by iron core 1 and winding, be characterized on unshakable in one's determination 1, being provided with three windows 3 unshakable in one's determination and two magnetic posts 2 along separate routes unshakable in one's determination, on two between the window unshakable in one's determination 3 of left and right side shunt magnetic posts 2 unshakable in one's determination, be wound with the former limit of circle winding 6, on each the magnetic post 2 along separate routes unshakable in one's determination between two adjacent windows unshakable in one's determination 3, be wound with a circle secondary winding 1 respectively and 25, two secondary windings one 4,25 of a circle secondary winding are connected in parallel as total secondary winding; Former limit winding 6 is placed on unshakable in one's determination 1 homonymy or toss about (homonymy in this accompanying drawing 1) with the end of secondary winding 1 and secondary winding 25, and arrow 8 is the sense of current.The turn ratio of former and deputy limit winding is 2: 1, and the leakage inductance of this transformer is reduced to 1/4th of traditional transformer approximately.

Embodiment two, with reference to accompanying drawing 2, a kind of low-leakage inductance transformer device, form by iron core 1 and winding, be characterized on unshakable in one's determination 1, being provided with window unshakable in one's determination 3 and two magnetic posts 2 along separate routes unshakable in one's determination of " fourth " font, unshakable in one's determinationly be wound with the former limit of circle winding 6 on the magnetic posts 2 along separate routes at two, on each magnetic post 2 along separate routes unshakable in one's determination respectively around a circle secondary winding 4 and a circle secondary winding 5, two secondary windings one 4,25 are connected in parallel as total secondary winding, the coiling that can interlock of former limit winding 6 and secondary winding one 4,25; The end of two secondary windings one 4,25 becomes an angle of 90 degrees to place with the end of former limit winding 6, arrow 8 is the sense of current, and the turn ratio of former and deputy limit winding is 2: 1, and the leakage inductance of transformer is reduced to 1/4th of traditional transformer approximately.

Embodiment three, if former and deputy limit winding turns is than being N: 1, wherein, former limit winding N is the integer greater than 2, N magnetic post 2 along separate routes then arranged on unshakable in one's determination 1, on this N shunt magnetic post 2, is wound with the former limit of circle winding 6, on this N shunt magnetic post 2 respectively around a circle secondary winding, as total secondary winding, the leakage inductance of this transformer is reduced to the 1/N of traditional transformer approximately with their parallel connections ²

Embodiment four, if N is bigger, and N is an even number, in order to reduce the volume of iron core 1, the number of turn of former limit winding 6 is made as 2 circles, and 1 has N/2 along separate routes magnetic post 2 on iron core, on this N/2 shunt magnetic post 2 unshakable in one's determination respectively around 1 circle secondary winding, with their parallel connections as total secondary winding, but this moment transformer leakage inductance be when being 1 circle 4 times of the number of turn of former limit winding 6.

Embodiment five, if N is bigger, and N is 3 multiple, in order to reduce the volume of iron core 1, the number of turn of former limit winding 6 is made as 3 circles, N/3 magnetic post 2 is along separate routes arranged on unshakable in one's determination 1, on this N/3 iron core shunt magnetic post 2 respectively around 1 circle secondary winding, with their parallel connections as total secondary winding, but this moment transformer leakage inductance be when being 1 circle 9 times of the number of turn of former limit winding 6; The rest may be inferred.

Embodiment six, if former and deputy limit umber of turn is than being N: M, wherein, secondary winding M be the integer less than N, then on iron core shunt magnetic post respectively around M circle secondary winding, all the other are identical with embodiment three.

Claims

1. low-leakage inductance transformer device, form by (1) unshakable in one's determination and winding, it is characterized in that on (1) unshakable in one's determination, being provided with a plurality of windows unshakable in one's determination (3) and a plurality of shunt magnetic posts (2), be wound with former limit winding (6) on a plurality of shunt magnetic posts (2) in the window unshakable in one's determination (3) of an and arranged on left and right sides or a side, in two adjacent windows unshakable in one's determination (3) each is wound with a secondary winding one (4) and a circle secondary winding two (5) respectively on the magnetic post (2) along separate routes, and secondary winding one (4) and secondary winding two (5) are connected in parallel becomes total secondary winding.

2. low-leakage inductance transformer device according to claim 1, it is characterized in that window unshakable in one's determination (3) makes " fourth " font and form a plurality of magnetic posts (2) along separate routes unshakable in one's determination, former limit winding (6) becomes an angle of 90 degrees placement with the end of secondary winding one (4) and secondary winding two (5).