CN201000802Y

CN201000802Y - Mutual inductance adjustable transformer

Info

Publication number: CN201000802Y
Application number: CNU2006201756267U
Authority: CN
Inventors: 牛嵨昌和; 张君毅
Original assignee: GUANGQUAN SCIENCE AND TECHNOLOGY Co Ltd
Current assignee: GUANGQUAN SCIENCE AND TECHNOLOGY Co Ltd
Priority date: 2006-12-27
Filing date: 2006-12-27
Publication date: 2008-01-02
Anticipated expiration: 2016-12-27

Abstract

The utility model relates to a transformer with adjustable mutual induction, which comprises a main iron core, two coils surrounding the main iron core and an adjusting iron core. The coils have a mutual induction effect. The cross-section area of the adjusting iron core is smaller than the cross-section area of the main iron core, the adjusting iron core is arranged between the coils and is adjacent to the main iron core, and the adjusting iron core can move relative to the main iron core. Thereby, the mutual induction quantity between the two adjacent coils can be adjusted through the movement of the adjusting iron core relative to the main iron core, the excitation magnetic flux of the coils influenced by the mutual induction effect is improved, consequently, the operation aim of achieving average and stable current on the coils can be realized.

Description

Can adjust the transformer of mutual inductance

Technical field

The utility model relates to a kind of transformer, particularly a kind of transformer of adjusting mutual inductance.

Background technology

LCD is many at present need be by cold cathode fluorescent tube (Cold CathodeFluorescent Lamp, CCFL) be used as main light source, must use high voltage because light this type of fluorescent tube, so the converter circuit that can utilize converter to form is reached the action of lighting a lamp, converter circuit adopts converter transformer to be used as the assembly that boosts, wherein can divide into the mode one to one that a converter transformer drives a fluorescent tube again, and the one-to-many manner of two fluorescent tubes of a converter transformer driving, if the LCD with 32 inches is an example, at present must use 16 tubes that backlight is provided, if adopt the man-to-man mode of lighting a lamp this moment, then certainly will need 16 converter transformers to drive, again when the size of liquid crystal panel increases, required fluorescent tube number also needs to increase, well imagine that the quantity of converter transformer also is growing on and on, and for the quantity that reduces converter transformer saving cost, followingly use one-to-many manner to light a lamp just to become main trend.

As shown in Figure 1, transformer form for present one-to-many, this transformer 200 comprises two rolls 20 and two U-iron hearts 21 that combine with described roll 20, one of them of described roll 20 is combined in a side of this U-iron heart 21, and the primary coil 201 of reeling, and another is combined in the opposite side of this U-iron heart 21 corresponding to the former, and two secondary coils 202 of reeling, this primary coil 201 produces coupling effect simultaneously with described secondary coil 202, the two ends of described secondary coil 202 can be connected to a fluorescent tube (as shown in Figure 2), yet, the distance of described secondary coil 202 is still quite near, can't avoid having between two secondary coils 202 mutual inductance to produce, if the coupling K between two secondary coils 202 and this primary coil 201 is very high, then equivalent electric circuit as shown in Figure 3, further convert Fig. 4 to and represent that then actual output situation becomes respectively the connect mode of one group of shunt load of a kind of two outputs with equivalence, just output current (I) equal two load currents (I1+I2 and I3+I4) and (I=I1+I2=I3+I4), again because of the impedance difference of each fluorescent tube, feasible each lamp current of flowing through of shunt effect is also inequality, add the mutual inductance effect influence of the above secondary coil 202, so that make two output voltages produce to cancel each other or situation such as amplification takes place, the shortcoming that then has first kind of form equally produces, just cause to allow indivedual fluorescent tube load currents equalizations and keep stable brightness, comprehensive above-mentioned prior art as can be known, described primary coil 101,201 with described secondary coil 102,202 coupling K can not be too high, otherwise output can equivalence become shunt load, so will cause described secondary coil 102,202 output current average effect is not good, if but reduce coupling K, then described secondary coil 102, it is big that 202 leakage current can become again, to cause described secondary coil 102,202 can't provide electric power to supply with fluorescent tube effectively, so in fact provide suitable coupling K just passable.

Summary of the invention

The purpose of this utility model is to provide a kind of can effectively adjust the mutual inductance effect of two adjacent windings, and then the transformer that makes the mutual inductance adjusted that electric current on each induction coil is average, stable.

This transformer that can adjust mutual inductance comprises a main core, and two coils around this main core, has mutual inductance effect between the described coil.

Of the present utility model being characterised in that: this transformer also comprises one and adjusts iron core, and its sectional area is less than this main core, and this adjustment iron core can be arranged between the described coil movably with respect to this main core, and contiguous this main core.

Effect of the present utility model is: utilize this adjustment moving with respect to this main core unshakable in one's determination, can adjust the mutual induction amount between the two-phase adjacent line circle, improve described coil because the interactional magnetizing flux amount of mutual inductance effect, increase effective magnetic circuit length, and the main magnetic circuit that makes this transformer possesses simultaneously that loose coupling is closed and close coupling cooperation usefulness, reaches average, the stable application target of electric current on the described coil.

Description of drawings

Fig. 1 is a schematic diagram, and transformer form in the past is described;

Fig. 2 is a schematic diagram, and two situations that secondary coil produces mutual inductance and intercouples with a primary coil are described in the above-mentioned transformer;

Fig. 3 is a schematic diagram, illustrates in the above-mentioned transformer, when the quite high equivalent electric circuit of described secondary coil coupling;

Fig. 4 is a schematic diagram, illustrates in the above-mentioned transformer, and two groups of fluorescent tube equivalences become shunt load;

Fig. 5 is a schematic diagram, illustrates that the utility model can adjust first preferred embodiment of the transformer of mutual inductance;

Fig. 6 is a three-dimensional exploded view, illustrates in above-mentioned this first preferred embodiment, and one adjusts the net sectional area that sectional area unshakable in one's determination is not more than a main core;

Fig. 7 and Fig. 8 are schematic diagrames, illustrate that the utility model can adjust second preferred embodiment of the transformer of mutual inductance;

Fig. 9 and Figure 10 are schematic diagrames, illustrate that the utility model can adjust the 3rd preferred embodiment of the transformer of mutual inductance;

Figure 11 is a schematic diagram, illustrates that the utility model can adjust the 4th preferred embodiment of the transformer of mutual inductance;

Figure 12 and Figure 13 are schematic diagrames, illustrate that the utility model can adjust the 5th preferred embodiment of the transformer of mutual inductance;

Figure 14 is a schematic diagram, illustrates that the utility model can adjust the 6th preferred embodiment of the transformer of mutual inductance;

Figure 15 is a schematic diagram, illustrates that the utility model can adjust the 7th preferred embodiment of the transformer of mutual inductance;

Figure 16 is a schematic diagram, illustrates that the utility model can adjust the 8th preferred embodiment of the transformer of mutual inductance;

Figure 17 is a schematic diagram, illustrates that the utility model can adjust the 9th preferred embodiment of the transformer of mutual inductance; And

Figure 18 and Figure 19 are schematic diagrames, illustrate that the utility model can adjust the tenth preferred embodiment of the transformer of mutual inductance.

Embodiment

Below in conjunction with drawings and Examples the utility model is elaborated.

Before the utility model is described in detail, be noted that in the following description content that similarly assembly is to represent with identical numbering.

Shown in Fig. 5,6, first preferred embodiment that the utility model can be adjusted the transformer of mutual inductance comprises two adjacent coils with mutual inductance effect 60, main core that the described coil 60 of confession centers on 61, sectional area adjustment iron core 62 less than this main core 61, reach one and stride the both sides of being located at this main core 61 and supply this adjustment 62 support bodys that wear 63 unshakable in one's determination, this support body 63 is presenting the n type in this first preferred embodiment.

This main core 61 is formed (UU type) by two U-iron hearts 610, and a side winding becomes two primary coils 611, opposite opposite side winding becomes two secondary coils 612, this main core 61 comprises long-range 614 of being away from this adjustment unshakable in one's determination 62, and this sectional area of long-range 614 is greater than the net sectional area 613 of this main core 61.

Described coil 60 is meant described secondary coil 612 in this first preferred embodiment, during actual the manufacturing also can be described primary coil 611, and described primary coil 611 is directly to be connected in series by same lead in this first preferred embodiment, also can be connected in series via formed outside line on the circuit board during actual the manufacturing.

The sectional area 621 of this adjustment unshakable in one's determination 62 is not more than the net sectional area 613 of this main core 61, and this adjustment unshakable in one's determination 62 is arranged between the described coil 60 and near this main core 61, in this first preferred embodiment, this adjustment 62 both sides and two ends that are across this main core 61 unshakable in one's determination contact with this main core 61, so form a contact area 622.

This adjustment unshakable in one's determination 62 can be done the displacement of advancing or retreating along a length direction X in this support body 63, simultaneously at the magnetic flux of not cutting apart described coil 60 generation mutual inductances, and make magnetizing flux can not form under the condition of effective magnetic shunt in fact, by the relative position that changes between this adjustment unshakable in one's determination 62 and this main core 61, just can change contact area 622 sizes of this adjustment unshakable in one's determination 62 and this main core 61, and then make the mutual inductance effect that influences the variation of the inductance value of each coil 60 reduce, should adjust unshakable in one's determination 62 at last again and make a glue with this main core 61 and fix, and just can finish the operation of the mutual inductance effect of this transformer of adjustment.

The above-mentioned mutual induction amount operation that utilizes this adjustment unshakable in one's determination 62 to adjust between the two adjacent lines circles 60 is according to following formula principle, so can improve described coil 60 because the magnetizing flux amount of mutual inductance effect reciprocal effect:

When adjusting operation, increase effective magnetic circuit length by appropriateness, and make the main magnetic circuit of this transformer possess simultaneously that loose coupling is closed and close coupling cooperation usefulness, and then just can reach average, the stable application target of electric current that makes on the described coil 60.

What deserves to be mentioned is in addition, because long-range 614 sectional area of this main core 61 is greater than the net sectional area 613 of this main core 61, therefore described secondary coil 612 will promote and forms close coupling and close at its coupling effect of the part that is adjacent to described primary coil 611, the part that described secondary coil 612 is adjacent to this adjustment unshakable in one's determination 62 will form loose coupling and close, so can be so that the capable ripple minimizing that enters from remote portion and avoid standing wave formation.

As Fig. 7, shown in 8, below will illustrate further second preferred embodiment of the present utility model, this second preferred embodiment and above-mentioned this first preferred embodiment are roughly the same, its difference is in the relative displacement between this adjustment unshakable in one's determination 62 and this main core 61, change air gap distance 623 (vertical air gap) between this adjustment unshakable in one's determination 62 and this main core 61 by the mode of vertical moving, for example shown in Figure 7, the pad 64 of an insulation is set in a support body 63, make this pad 64 between this main core 61 and this adjustment unshakable in one's determination 62, so when this adjustment unshakable in one's determination 62 is set to this support body 63, just can obtain the air gap distance 623 of different vertical height via this pad 64, cooperate practical situation to use the pad 64 of different-thickness specification just can reach the effect of adjusting this air gap distance 623, in addition as shown in Figure 8, can install an eccentric runner 65 that rotates on the support body 63, make this runner 65 be resisted against the bottom of this adjustment unshakable in one's determination 62, so just can utilize the mode of this runner 65 of rotation to reach the effect of adjusting this air gap distance 623, and can reach the application target of adjusting mutual induction amount between the described coil 60 equally.

As Fig. 9, shown in 10, below will illustrate further the 3rd preferred embodiment of the present utility model, the 3rd preferred embodiment and above-mentioned this second preferred embodiment are roughly the same, its difference is in the relative displacement between this adjustment unshakable in one's determination 62 and this main core 61, be by the mode that makes this adjustment unshakable in one's determination 62 advance or retreat along this length direction X, change the air gap contact area 624 (area of projection downwards as shown in Figure 9) between this adjustment unshakable in one's determination 62 and this main core 61, also can change air gap distance 623 (forming horizontal air gap as shown in figure 10) in addition, then can reach the application target of adjusting mutual induction amount between the described coil 60 equally by this adjustment 62 modes that move horizontally along this length direction X unshakable in one's determination.And what deserves to be mentioned is again, shown in Fig. 9,10 as described in coil 60 be to form series connection by 70 welding of formed outside line on the circuit board.

As shown in figure 11, below will illustrate further the 4th preferred embodiment of the present utility model, the 4th preferred embodiment and above-mentioned this first preferred embodiment are roughly the same, its difference is in and is arranged with a primary coil 611 and a secondary coil 612 in the both sides of this main core 61 respectively, described coil 60 is meant described secondary coil 612 in this 4th preferred embodiment, also can be meant described primary coil 611 during practical application, wherein in this 4th preferred embodiment, as long as this adjustment of utilization unshakable in one's determination 62 and this main core 61 relatively move, then by above-mentioned this first, two, the adjustment mode of three preferred embodiments can reach the result of use of adjusting mutual induction amount between the described coil 60 equally.

As Figure 12, shown in 13, below will illustrate further the 5th preferred embodiment of the present utility model, the 5th preferred embodiment and above-mentioned this first preferred embodiment are roughly the same, its difference is in the same side that all is set around this main core 61 in described primary coil 611 and described secondary coil 612, described primary coil 611 wherein shown in Figure 12 is set around the opposite end of described secondary coil 612 and directly is connected in series, and described coil 60 is meant described secondary coil 612, and described secondary coil 612 shown in Figure 13 is set around the opposite end of described primary coil 611, described coil 60 is meant described primary coil 611 and directly serial connection is continuous, this adjustment unshakable in one's determination 62 all is arranged between the described coil 60, and be across the both sides of this main core 61, as long as this adjustment of utilization unshakable in one's determination 62 and this main core 61 relatively move, then by above-mentioned this first, two, the adjustment mode of three preferred embodiments can reach the result of use of adjusting mutual induction amount between the described coil 60 equally.

As shown in figure 14, below will illustrate further the 6th preferred embodiment of the present utility model, the adjustment iron core 62 of the 6th preferred embodiment is arranged at the centre of a drum stand 66, the both sides of this drum stand 66 are arranged with primary coil and secondary coil, and the centre is provided with most can be resisted against the protruding grain 661 that this adjusts 62 sides unshakable in one's determination, this adjustment unshakable in one's determination 62 is subjected to the contact of described protruding grain 661 and is maintained fixed, and promoted by external force and reach the function of adjusting mutual inductance effect between two lateral coils.

As shown in figure 15, below will illustrate further the 7th preferred embodiment of the present utility model, the 7th preferred embodiment and above-mentioned the 6th preferred embodiment are roughly the same, the open side that its difference is in the middle of this drum stand 66 is provided with a shell fragment 662 that contact is provided, another open side is provided with a bolt 663, this adjustment unshakable in one's determination 62 is located between this shell fragment 662 and this bolt 663, when these bolt 663 rotations, but this adjustment of interlock unshakable in one's determination 62 with this shell fragment 662 be fulcrum do the elevation angle on, move down, and then can change vertical gas length between this adjustment unshakable in one's determination 62 and this main core 61, reach the function of mutual inductance effect between adjustment two lateral coils.

As shown in figure 16, below will illustrate further the 8th preferred embodiment of the present utility model, the 8th preferred embodiment and above-mentioned the 7th preferred embodiment are roughly the same, the open side that its difference is in the middle of this drum stand 66 is provided with a bolt 663 that is resisted against this adjustment unshakable in one's determination 62, the radial width of this bolt 663 differs, so when this bolt 663 rotates, can promote this adjustment unshakable in one's determination 62 and produce the front and back slippage, and reach the function of adjusting mutual inductance effect between two lateral coils.

As shown in figure 17, below will illustrate further the 9th preferred embodiment of the present utility model, the 9th preferred embodiment and above-mentioned the 6th preferred embodiment are roughly the same, it is a stay bolt that is arranged in these drum stand 66 centres simultaneously that its difference is in this adjustment unshakable in one's determination 62, by the mode that spiral shell advances, spiral shell moves back can adjust and this main core 61 between air gap area, and then reach the function of adjusting mutual inductance effect between two lateral coils.

Shown in Figure 18,19, below will illustrate further the tenth preferred embodiment of the present utility model, the tenth preferred embodiment and above-mentioned this first preferred embodiment are roughly the same, its difference is in also comprising an elementary drum stand 81, a secondary rolling thread frame 82, and a framework 83 that is linked to this elementary drum stand 81 and this secondary rolling thread frame 82.

This framework 83 comprises first framework 831 that is incorporated into this elementary drum stand 81, second framework 832 that is incorporated into this secondary rolling thread frame 82, a plurality ofly is formed on this first and second framework 831,832 respectively and the connecting piece 833 that can make up mutually, and one from this first framework 831 extend to this second framework 832 and can be ccontaining should adjustments unshakable in one's determination 62 the space 834 that stretches through, described connecting piece 833 is respectively with concavo-convex chimeric block structure formation binding.

This main core 61 is arranged in this elementary drum stand 81 and this secondary rolling thread frame 82, aforementioned coil (figure does not show) with mutual inductance effect is set around this secondary rolling thread frame 82, this adjustment unshakable in one's determination 62 is arranged in the space 834 that stretches through of this framework 83, and can promote along this space 834 that stretches through, and then produce the function of adjusting mutual inductance effect by external force.

So, explanation by above-mentioned each preferred embodiment as can be known, no matter aforementioned coil with mutual inductance effect is meant primary coil or secondary coil, the utility model can be adjusted 62 change in displacement with respect to this main core 61 unshakable in one's determination by this, make the mutual induction amount between the described coil obtain to adjust, and then reach average, the stable application target of electric current that can make on the described coil.

Claims

1. the transformer that can adjust mutual inductance comprises a main core, and two coils around described main core, has mutual inductance effect between the described coil, it is characterized in that:

Described transformer also comprises one and adjusts iron core, and its sectional area is less than described main core, and described adjustment iron core is to be arranged at movably between the described coil with respect to described main core, and contiguous described main core.

2. the transformer of adjusting mutual inductance according to claim 1 is characterized in that: the described sectional area of adjusting iron core is not more than the net sectional area of described main core.

3. the transformer of adjusting mutual inductance according to claim 1 is characterized in that: described main core comprises that is away from the described long-range portion unshakable in one's determination that adjusts, and the sectional area of described long-range portion is greater than the net sectional area of described main core.

4. the transformer of adjusting mutual inductance according to claim 1 is characterized in that: described coil is that directly serial connection links to each other.

5. the transformer of adjusting mutual inductance according to claim 1 is characterized in that: described coil is to link to each other via the outside line serial connection.

6. the transformer of adjusting mutual inductance according to claim 1, it is characterized in that: a side winding of described main core becomes primary coil, opposite opposite side winding becomes secondary coil, described coil is the primary coil that is set around on the described main core, and described adjustment iron core is across the both sides of described main core.

7. the transformer of adjusting mutual inductance according to claim 1, it is characterized in that: a side winding of described main core becomes primary coil, opposite opposite side winding becomes secondary coil, described coil is the secondary coil that is set around on the described main core, and described adjustment iron core is across the both sides of described main core.

8. the transformer of adjusting mutual inductance according to claim 1, it is characterized in that: a side winding of described main core becomes primary coil, become secondary coil in homonymy also winding, described coil is the primary coil that is set around on the described main core, described adjustment iron core is arranged between the described primary coil, and is across the both sides of described main core.

9. the transformer of adjusting mutual inductance according to claim 1, it is characterized in that: the both sides of described main core are primary coil of winding and a secondary coil respectively, described coil is the secondary coil that is set around on the described main core, described adjustment iron core is arranged between the described secondary coil, and is across described main core.

10. the transformer of adjusting mutual inductance according to claim 1, it is characterized in that: two primary coils of a side winding of described main core, in homonymy secondary coil of each winding of opposite end at described primary coil, described coil is the secondary coil that is set around on the described main core, described primary coil is direct serial connection, described adjustment iron core is arranged between the described secondary coil, and is across the both sides of described main core.

11. the transformer of adjusting mutual inductance according to claim 1, it is characterized in that: two secondary coils of a side winding of described main core, in homonymy primary coil of each winding of opposite end at described secondary coil, described coil is primary coil and the direct serial connection that is set around on the described main core, described adjustment iron core is arranged between the described secondary coil, and is across the both sides of described main core.

12. the transformer of adjusting mutual inductance according to claim 1 is characterized in that: the described adjustment contact area that contacts with described main core that comprises unshakable in one's determination, described adjustment iron core can move and changes described contact area with respect to described main core.

13. the transformer of adjusting mutual inductance according to claim 1 is characterized in that: described adjustment is unshakable in one's determination to comprise that one extends to the air gap distance of described main core, and described adjustment iron core can move and changes described air gap distance with respect to described main core.

14. the transformer of adjusting mutual inductance according to claim 1, it is characterized in that: the described adjustment air gap contact area adjacent with described main core that comprise unshakable in one's determination, described adjustment iron core can move and changes described air gap contact area with respect to described main core.

15. the transformer of adjusting mutual inductance according to claim 1 is characterized in that: also comprise one and stride the both sides of being located at described main core and the support body that wears for described adjustment iron core.

16. the transformer of adjusting mutual inductance according to claim 1 is characterized in that: also comprise one and be arranged between described main core and the described adjustment iron core and the pad of insulation.

17. the transformer of adjusting mutual inductance according to claim 1, it is characterized in that: also comprise one and stride the support body of being located at described main core both sides, and a runner that is arranged at described support body and eccentric rotation, described runner is resisted against the described bottom unshakable in one's determination of adjusting.

18. the transformer of adjusting mutual inductance according to claim 1, it is characterized in that: also comprising one can be for the drum stand of described coil winding, the described adjustment centre that is arranged at described drum stand unshakable in one's determination, described drum stand comprise a plurality of protruding grains that are resisted against described adjustment side unshakable in one's determination.

19. the transformer of adjusting mutual inductance according to claim 1, it is characterized in that: also comprising one can be for the drum stand of described coil winding, the shell fragment of an open side that is arranged at described drum stand, and a bolt that is arranged at another open side of described drum stand, described adjustment iron core is located between described shell fragment and the described bolt.

20. the transformer of adjusting mutual inductance according to claim 1 is characterized in that: also comprising one can be for the drum stand of described coil winding, and described adjustment iron core is one and is arranged in the middle stay bolt of described drum stand.

21. the transformer of adjusting mutual inductance according to claim 1, it is characterized in that: also comprise an elementary drum stand, a secondary rolling thread frame, and framework that is linked to described elementary drum stand and described secondary rolling thread frame, described main core is arranged in described elementary drum stand and described secondary rolling thread frame, described coil is set around one of them of described elementary drum stand and described secondary rolling thread frame, and described adjustment iron core is arranged on the described framework.

22. according to the claim 21 described transformer of adjusting mutual inductance, it is characterized in that: described framework comprises first framework that is incorporated into described elementary drum stand, second framework that is incorporated into described secondary rolling thread frame, a plurality ofly is formed on described first and second framework respectively and the connecting piece that can make up mutually, and one extends to described second framework and can the ccontaining described space that stretches through unshakable in one's determination of adjusting from described first framework.